,
What is happening
to our sea? Is New Zealand facing an ecological
melt-down? by Dr J Floor Anthoni (2009)
www.seafriends.org.nz/decay/our_sea.htm
Within a mere thirty years, New Zealand's
seas have been deteriorating beyond belief, affecting all marine species
from sponges to dolphins and from plankton to seaweeds. This chapter leads
you on a tour of discovery of how and why this happens, and eventually
what can and must be done to stop this vicious cycle. It must be very disappointing
that this is happening to 'green and clean' New Zealand, but everywhere
else in the world the situation is similar or worse, for the same reasons.
Be concerned, very concerned. Follow the links for further detailed studies.
Introduction: about this chapter and
links to other chapters where the issues are dealt with in detail.
Examples of degradation:
examples of how the sea is degrading; examples of collapsing fish stocks
and mass mortalities, and how it is accelerating;
Marine reserves? even within fully
protected marine reserves, species disappear; monitoring results tell the
story.
Sick seas? it seems as if the water is
sick. The planktonic bacteria which are the most important part of the
marine ecosystem, have been overlooked by mainstream science. They explain
how eutrophication and degradation of the sea works.
Sources of nutrients: clay,
human sewage, farm runoff, fertilisers, soil degradation, overgrazing,
erosion are our main problems
What can we do? we have degraded the
seas but also our minds, and salvation is not likely. But here are the
most important things to do.
related pages on this web site
soil:
understanding how soil works and how it erodes, and what we should do.
(large and important)
NZ soils:
soils in NZ, an important reason why NZ is special and why we must look
for our own solutions.
why NZ is
special: New Zealand has been an isolated continent for 60 million
years. It is a special place with special needs. Every country is.
principles
of degradation: degradation happens slowly, almost invisibly. How
does it work and how can one see it?
conservation:
principles of resource management, conservation, marine conservation, degradation,
myths and more. (large and important)
marine
reserves: they could resemble paradise but why do they disappoint?
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-- Seafriends home -- decay
index -- Rev 20090626,
Introduction Degrading seas are nothing new as this has been happening all over
the world, but for it to happen here in New Zealand, now, needs an explanation.
New Zealand is thought of as a 'green and clean' nation, still very much
in tune with nature. But nothing could be further from the truth, as the
ill health of our coastal waters testifies - the sea is the sump of
civilisation; it reveals the truth.
Never before have so few people done so
much harm to the environment, and over such large areas and in such a
short time period as here in New Zealand. - Floor Anthoni
The coastal
seas in New Zealand have suddenly fallen ill since about 1960, but to a
lesser extent earlier still. We discovered this around 1987, reason why
the Seafriends Marine Conservation and Education Centre was established
in 1990, opening in 1992. We saw how species diminished in numbers or disappeared
from large areas, even extending outward to the edge of the continental
shelf, and that apparently no species was exempted. Something mysterious
was going on. What could this be and how could we fix it?
We are witnessing a rapidly increasing torrent of erosion, a sure sign
that we are losing our fertile lands. In the sea we witness the rapid decline
in quantity and quality of life over unexpectedly huge areas. The loss
of our fisheries is now proceeding rapidly. We are also witnessing the
loss of our precious beaches. It could be said that our nation is in an
unstoppable ecological melt-down while people remain unconcerned and unaware.
Now some 20 years later, we (Seafriends) can look back on an extraordinary
effort that brought all the science together, augmented by our own discoveries.
Sadly, you can read about this only on our web site and even here the pieces
of the puzzle appear scattered around. Hence this long page which aims
to reveal the emerging picture. Remember that the Seafriends website is
educational, taking you step by little step, beginning from the very basics,
for you to understand how the planet works, and how we are throwing spanners
into its clockwork. Consider therefore this page as an overview, an introduction,
inviting you to further your studies and eventually towards reading all
of this web site.
During two decades of study, we discovered that our knowledge of the
sea is entirely inadequate. In fact, nothing in the sea works as expected
from our knowledge of the ecology on land. A radically new body of knowledge
is needed, some of which we have pioneered ourselves. It should not be
surprising then that we at Seafriends, are at odds with mainstream science,
and also that mainstream scientists are our most formidable obstacle towards
solutions.
Nothing in the sea works as expected from
our knowledge of the environment on land. - Floor Anthoni
Threats to the
marine environment have not been left unnoticed, as the list shows. On
top is usually that of fishing, generally considered to be the main threat.
However, we contend that this is no longer so. As humans fished the sea,
we saw fish stocks decline - a correlation, which is not necessarily proof.
But was the decline caused by fishing or by something else?
In the left column is an indication how perceived threats (in blue)
are relevant to the seas in New Zealand (red), with fishing, competition,
erosion and farm runoff as most important, chemical pollution and exotic
species as hardly relevant, and all others irrelevant. Note that habitat
loss and fragmentation (at the bottom of the list) are the worst threats
on land. Read also: conservation
and marine conservation.
Early on we recognised that fishing and competition for food are no
longer the main threats, because many unfished species disappeared faster
than fished ones. We also discovered that fisheries management is a fraud
but the chapter
about this is still in preparation. Read Inconvenient
questions for the Minister of Fisheries to begin with.
So we are left with the two main culprits: soil erosion and nutrient
discharge, both hard nuts to crack as a lot of knowledge is needed for
understanding soil, and hardly anything is known about how soil loss and
nutrient discharge affect the sea. Fortunately we made a major breakthrough
with a simple but new method to measure the health of aquatic environments,
when we discovered that the sea does not work the way we thought. Mainstream
science has overlooked the planktonic decomposing bacteria that have a
decisive influence on the aquatic environment and the world. They can make
the water 'sick' and eventually become a potent killer of aquatic life,
beginning with the smallest fry, the zoo plankton and the fish larvae.
This is called eutrophication (overnourishing).
Planktonic bacteria rule the world.
- Floor Anthoni
In recent times the idea that marine reserves can help, has taken the
world by storm, but as with many such flash-in-the-pan ideas, they do not
pass the reality test. Marine reserves are protected areas in the sea where
fishing is prohibited. As expected, the fished species benefit and return
to levels resembling a distant past. But many if not most marine reserves
disappoint, because they are losing quality and quantity of life instead
of gaining . Also in places where fishing was stopped, fish stocks do not
recover. Apparently the negative influence of eutrophication is the main
problem. In order to save the sea, we must first save the land.
In order to save the sea, we must first
save the land.
Although
New Zealand has only 4 million inhabitants, it has a considerably larger
livestock, not long ago consisting of 50 million sheep and 8 million cattle.
Even though these ratios have changed, their total 'footprint' equals that
of 200 million people, and some scientists would say even more. Their effluent
is not fully recycled on the farm, ending up in the sea where it fertilises
the plankton. Add to that an exorbitant amount of erosion, the sea is being
overfertilised by over 6 times of what used to be normal. All this precious
waste fertilises the plankton in the sea, which leads to over-dense plankton
blooms that can become harmful either by the bloom of poisonous species
or by the 'rot' caused by planktonic bacteria. As a result, the sea is
no longer as productive, while fish 'babies' are being 'born' haphazardly
or not at all. Ultimately this leads to the collapse of fish stocks, while
fishermen are blaming one another.
Summing it up, New Zealand has precisely the same problems as elsewhere
in the world, and these depend on location:
1. soil erosion: soil washes into the sea where the nutrients
stored in clay platelets are released. In addition it provides for the
micro nutrients of iron and silicium which phytoplankton needs.
2. soil degradation: the loss of soil fertility due to inadequate
recycling on the farm, overgrazing and ploughing.
3. human and stock sewage: human sewage is in general, not recycled
at all (it is 'treated'), but ends up in the sea in its entirety where
it supplies the perfectly balanced fertiliser. This makes the human as
polluter rather big (10 times) compared to animals of comparable size.
4. excess fertiliser: modern farming uses the soil as merely
a form of hydroponics where the soil itself provides little nutrition,
requiring the use of copious amounts of fertiliser. To make matters worse,
there is a race going on for producing more with less, resulting in overfertilisation.
Excess fertiliser is washed out by rains and ends up in the sea. Note however,
that there exists a radical difference between high country pastures and
lowland dairy farming, and cropping. Not all application of fertiliser
is harmful to the sea! Indeed some is needed to minimise erosion. Be aware.
5. fishing: the world is still overfishing in a race to produce
exports from the sea. However, this can relatively easily be controlled.
Furthermore, as we have shown, fishing is increasingly threatened by the
bacterial 'rot' in the sea and by mismanagement due to misunderstanding.
Ironically,
New Zealand, one of the youngest countries (most recently developed) on
Earth, follows what is happening elsewhere. Why?
The graph shows the growth of the world's population and use of energy
on a logarithmic scale. The three thin lines top left show growth rates
of 5, 10 and 100 times per century. As can be seen, the human population
has been growing at its fastest rate ever over the past 50 years, while
energy use has been growing fast for a century. Note that fishing depended
on energy more so than on population, and it has been flattening off for
some time (there's less fish and energy is dearer). The amount of water
per person has been keeping pace with population growth, but will soon
become a problem. Not shown in the graph is the amount of arable land per
person and food per person, also imminent problems.
As rapidly growing populations needed more food, they began developing
marginal land (on inland hill slopes), which is unsustainable. First the
forest is cleared, then the remainder burnt, and finally the soil hoed.
Unnoticeably, this also changed the climate, resulting in less rain arriving
in the centres of the continents (short-circuiting
the water cycle). Deserts expand and crops fail. Eventually the marginal
lands degrade and they are abandoned. In the meantime erosion accelerates.
In other words, erosion keeps pace with the growth of the population, and
this happens everywhere. The problems 1,2,3 and 4 accelerate with the growth
of the world's population and New Zealand is part of that.
Sadly the world has been obsessed with the supposed threat from man-made
global warming but anyone who has studied this perceived problem, knows
that the amount of CO2 in the atmosphere is fully saturated as far as its
ability of trapping warmth is concerned. Global warming from excess CO2
is simply not possible! It is not a threat. Indeed more CO2 and a warmer
world will help produce more food while reducing erosion as well. It is
thus rather disappointing that the world's real problems are not
sufficiently acknowledged:
1. soil degradation and soil erosion: more and more arable land
is abandoned as its fertility is exhausted after only a few decades of
farming. Irrigated soils are becoming salty because there's not enough
rain to flush the salt out.
2. shortage of water: deforestation causes less rain. Underground
aquifers are drying up. Lakes are evaporating more quickly. Industry requires
large amounts of water. Inland glaciers receive less snow and their rivers
become smaller. There are more sudden droughts because there is less
water to buffer (even out) temperature variations.
3. degradation of coastal seas: as nutrients, silt and clay
end up in the sea, the planktonic bacteria take over, causing loss of life
and eventually fisheries collapses.
4. global cooling: we are living in a warm inter-glacial (between
ice ages) and one day a new ice age begins. Apart from this, we are entering
a new solar cycle with less solar energy and a cooler climate. Double-cropping
(2 crops per year) becomes impossible in many places. Crop failures become
more common. Famine reigns. Economies collapse.
Living
within a limited environment; era of scarcity What will happen precisely and how soon, of course remains a guess.
In the population/energy diagram above we have seen explosive (exponential)
growth, similar to a bomb exploding. Well, that is pretty sudden and yes,
explosive. But there exists something even more sudden, that of an unstoppable
object hitting an unmovable wall. We are in fact in such a situation, living
inside a finite box (the ecosystem). As we grow, there is less and less
space left in the box, and eventually we cannot breathe anymore. Very suddenly
all life stops. An unstoppable growth has reached an unmovable limit. We
may be arrogant enough to think that we live within the box we made ourselves
(our culture/technology/agriculture), but we depend on fresh air, clean
water, pollution cleanup, wild harvest and room to live. In other words
we depend on what happens in the left-over space, which provides for these
ecosystem services. In the graph shown here I've tried to illustrate this,
inventing the mathematics of scarcity, which are really very simple.
The graph shows in grey what humans use, and in green how much of nature
is left over. As we use more and more, leaving less and less, we move according
to the black line, and we have arrived somewhere in the middle. Soon, suddenly
and unexpectedly, the ecosystem services become inadequate (red curve).
Also species extinctions begin to accelerate, and then the two work together
(not shown). We have no idea which will be the first one, or which the
severest, but where will we be in 2030 with over 9 billion people? See
how sudden threats can arrive and accelerate? For a list of ecosystem services,
see biodiversity1.
The
degradation in the sea is clearly a case of ecosystem services (diluting
and using nutrients) becoming inadequate, leading to loss of the quantity
of life (density) and quality of life (biodiversity), all in accordance
with above mathematics of scarcity. It should be easy to understand, but
there are serious obstacles in the way of understanding and solving our
problems, as shown in the diagram.
When dealing with nature, one deals with a complicated machine which
often works contrary to intuition, and where everything affects everything
else, often in a seemingly irrational way. To make matters worse, one cannot
easily conduct experiments, and worst, the sea is so strange that it does
not obey the ecological laws that apply to the land. We are really ignorant
in this matter.
As the laws of scarcity begin to bite, we will be experiencing more
problems, that arrive faster, are more intensive and also more complicated.
Against this onslaught we only have our knowledge as weapon, but it too
has increasing limitations and uncertainties. It thus appears that we are
ill prepared for what is still to come. Worse still, we are keeping our
heads in the sand.
After this introduction, we will now leave the other problems of the
planet, and focus on what is happening to the sea.
Examples of
degradation Degradation (=stepping down) in the sea is rather difficult to see
because some of it is very natural. For instance, one expects the water
close to a river mouth to be less healthy than further out in sea, even
in the absence of human populations. It just so happens that people like
to live close to natural harbours and rivers. Thus the unnatural and the
natural are overlapping in a gradient extending from human influence towards
where that influence becomes negligible. Even when observed over time,
one may see the environment degrading, but is this caused by human influence?
Is it caused by pollution or by climate change or by something unknown?
Observing degradation is further hindered by our inability to see what
is missing. In addition, very few of us are regular divers, and those who
are, are often interested only in harvesting food. Likewise, underwater
photographers are interested in snapping that winning shot and marine scientists
are interested in collecting data. Very few, if any, can see what is changing
under water and document it as well. See principles
of degradation. in order to learn how degradation works and how to
'see' what is no longer there.
Not seeing what is missing In recent years we have had unusually cold summers and
winters here in NZ but compensated for by clearer skies and sunny days.
Yet people hardly noticed that their balmy barbecue evenings were few and
far between. Because of the cold weather, there have hardly been any flies
and mosquitos, yet nobody noticed. The cicadas sang only for 4 weeks rather
than the usual 9 weeks, and crickets were similarly short-seasoned. There
are hardly any young birds. Yet when asked, people didn't notice. Also
the sea water has been unusually cold, but there have been no reports about
this. The sea has not experienced summer for three years now. Stragglers
from warmer waters are absent. Recruitment is poor for many species. These
are all very clear signals, but not seen by the vast majority of people,
and they are not recorded or reported.
f032601: abundant life in a sheltered place outside currents
that feed, yet there's no vacant space. Calcareous flask sponges amongst
a dense cover of other sponges. Rikoriko cave, Poor Knights Islands reserve,
100km from Auckland.
f036814: this wall used to be as dense as the one shown left,
but is now covered in scruffy zonaria seaweeds and a sprinkling
of red carpet sponges. There is much vacant space (purple patches). Arid
Island, 60km from Auckland.
f033805: robust sponges looking very sick where once seaweeds
stood. Martins Bay, 30km from Auckland.
f035907: mud, deposition, scruffy seaweeds and introduced
velvet sponges. Te Matuku marine reserve, 10km from Auckland.
Study many more examples of what
decay looks like under water.
Fish mortalities One would
think that fishermen would notice the mass fish mortalities happening now
and then, but hardly any do. Fish stocks consist of many year classes,
and commercial species roam around quite a lot. So a mass mortality in
one place soon evens out by fish migrating there from elsewhere. It has
become very common that the mortality happens to an entire year class of
recruits (fish babies). But even this is not directly noticeable because
the other year classes are still there. Fishermen catch fish at 'legal'
sizes, the small adults which are already many years old. So they do not
observe the new recruits. But as divers we have observed a number of mass
mortalities, because we were there when it happened. Strangely, these have
occurred nine years apart: 1983, 1992, 2001, and will one occur in 2010?
Read more in timeline
of degradation events.
The map shows my favourite places to harvest scallops (Pecten novaezealandia)
but the shellfish are no longer there. What once were scallop beds do not
even look like ones. Clearly something went very wrong. The graph shows
fisheries data for this area, in essence supporting what we saw. These
places are about 60km from Auckland, the main population centre of 1 million
people. This is a good example of definite degradation over a twenty year
period. But how would other shellfish fisheries fare?
Most
shellfish are found precisely where people want to live, inside estuaries
or in sheltered straits and coasts. It stands to reason therefore, that
they are the first affected by degradation, and indeed, fisheries statistics
show that all New Zealand shellfish fisheries have collapsed, with some
in their final decline. Most collapses happened within a single decade.
These statistics are quite worrisome because the collapses happened to
well-managed fisheries. Apparently we appear powerless to the thing that
causes it. More importantly, fisheries management is impotent to turn it
around. Anything we do in the sea, won't work. We have to
go back to the land and save our soils.
Reader, this is what marine degradation looks like. It is something
seemingly beyond our control. Note also how it has been accelerating since
1990. We may blame overfishing, which is always true to some extent, but
we cannot fix it by doing or not doing something in the sea. Read more
in shellfish collapses
in NZ, a tragedy.
Only by saving the land can we save the
sea.
Marine reserves? We mentioned
marine reserves before and how little they can do for the environment,
but because fishing is prohibited, they conclusively show what happens
to the environment in the absence of fishing, and the news is bad and conclusive.
The graphs shows how clams declined inside a voluntary reserve at a
sheltered coasts inside Auckland. After having noticed the decline of edible
shellfish on Cheltenham Beach, it was declared a voluntary protected area
where the taking of shellfish was closed for over ten years. Because many
people live immediately around this area, it was very actively policed.
It was hoped that the shellfish would return, because their decline was
blamed on excessive takings. However, rather than recovering, the shellfish
declined further. Protecting them obviously did not work.
The Poor Knights
islands, located at the edge of the continental shelf, over 100km from
Auckland, have already for over 30 years been protected, first voluntarily
and later partially. But in 1998 it was closed entirely to all forms of
fishing. Enthusiastically, scientists finally began taking stock, in the
hope that the beneficial effects of marine reserves could be demonstrated
once and for all. Indeed they measured an increase in snapper (Pagrus
auratus) but with the dubious Baited
Underwater Video technique which tends to exaggerate. In this diagram
the visual counts for snapper are shown, with a positive trend and large
seasonal variations. In other words, most snapper come and go and are not
protected, but the oasis nature of these islands attracts them from afar.
Their numbers and sizes increased indeed once fishing stopped.
Read more about our finest marine reserve, the Poor
Knights (extensive).
More telling are the declining stocks of nearly all other species,
something that began a decade earlier. What we are seeing here is a spectacular
fish collapse inside a well protected marine reserve. What's more, the
species shown here have never been targeted for fishing. Only one species,
the sweep
(Scorpis lineolatus) became more numerous, but this species
does not belong here as it prefers the degraded waters closer to Auckland.
In other words, the waters around these remote islands have degraded in
recent years.
To make matters more confusing, scientists at the University of Auckland
claimed to have found the effects of trophic cascades (domino effects
by one species eating another) in the Goat Island marine reserve. They
claimed that marine reserves eventually have large predatory fish capable
of eating spiny sea urchins. The barren zones found along the east coast
are thought to have been caused by excessive numbers of sea urchins, because
there are not enough large snappers to keep them in check. This plausible
story is wrong on two counts: barren zones are not caused by grazers but
by storms, and scientists' experiments proved the opposite of what they
claimed. In the box on right is the result of one experiment that looked
at many marine reserves, and found that marine protection (green) has no
measurable effect on its habitats, whereas pollution (red) has a considerable
influence.
Read further our extensive
rebuttal of the snapper-urchin-kelp myth and a short
version, and storm
barrens.
Effects
of environment variables 25
turbidity/ visibility
18
sediment cover
10 depth
7 slope, aspect
6 wave exposure
4 sea urchins
in the open
0.5
marine reserve or not
Source: Shears & Babcock
2004, DSIS192
Sick seas? Already in 1987 it became clear that there was something happening
in the sea, so large and so widely spread, as if the water were sick.
Less than twenty years later (2003, 2005) we found and proved that this
is indeed the case. It may sound unbelievable, but all marine scientists
over a period of a century, have overlooked the most important ecological
factor in the sea: the panktonic (suspended) bacteria. It
is no exaggeration to say that they rule the sea and because of its size,
also the world. The sea does not work the way we thought. In order to understand
this, we'll recall some basic marine ecology which is not difficult
to grasp.
The biggest
food chain in the sea is that of the open water to a depth of 100m, mainly
over continental shelves where nutrients are rich. It begins with the smallest
of plants that float in the water, the phytoplankton. Being only
one cell in size, they can grow very fast. A typical plankton bloom can
be over within one or two weeks. The phytoplankton is 'grazed' upon by
invisibly small animals called the zooplankton. These in turn are
eaten by fish larvae. The fish larvae are eaten by bait fish
which are eaten by the larger predators, our table fish. In the
process a lot of energy is wasted, so that the biomass of each higher level
(trophic level = food level) is about ten times smaller than the level
below it. To achieve one kg growth of table fish, one needs 10x10x10x10=10,000
kg of phytoplankton. Note that these figures are not exact but serve only
to give an idea of the whole. The foodchain is also more complicated and
rapid cycling behaves as if there is more biomass.
The food chain
itself is not a complete ecosystem since the loop is not closed, as shown
here where two new components are added: the benthic (=bottom) decomposers
that decompose wastes and dead matter raining from above, converting it
back into nutrients that feed the plant plankton. The decomposers
consist of tiers of feeders like crabs able to cut dead animals to pieces,
detritus feeders like worms, and bacteria. Of these the bacteria do the
most difficult work, that of turning biomolecules into nutrients (=liquid
salts). Today, mainstream science still thinks that this is all there
is to it, but we discovered that the most important part had been overlooked.
It takes a
long time for dead plankton to sink to the sea bottom, and then it takes
between 1 and 1000 years for the nutrients to return to the surface (in
deep seas). But nature is not stupid. Every litre of seawater contains
millions of bacterial cells and many millions more virus particles, all
working as planktonic decomposers. Thus when a plant plankter dies,
it is almost immediately decomposed such that one third of the nutrients
return to the surface within one week (depending on temperature). The same
goes for zoo plankton. However, bigger waste pellets and dead fish do sink
to the bottom to be decomposed there. Our measurements showed that the
planktonic decomposers often form a larger biomass than the phytoplankton,
particularly in sick seas.
The importance of the discovery of the planktonic decomposers cannot
be overstated as they have the largest influence on marine ecosystems.
Designed to break biomatter apart, they are of the infectious type, ready
to kill also living creatures. Living in the sea is not like living on
land, where one can breathe pure and uncontaminated air. In the sea one
breathes contaminated water. It is like living inside a mix of thin soup
and thin sewage. Where the soup is thick, life is fast and short. Where
the soup is thin, life is frugal but long-lived. Thus highest biodiversity
is found where food is scarce and bacterial rot least. Likewise, eutrophication
is caused by dense food and dense decomposers, resulting in loss of life
and biodiversity - exactly what is observed world-wide. But there is more
to it.
The planktonic decomposers also have a selective influence on which
species make up the phytoplankton. Under the influence of bacterial rot,
only the most hardy of plant plankters can survive, the ones with little
exposure, fast growth rates or those with armaments. These properties also
make them difficult to digest by the small zooplankters. Thus the amount
of food entering the food chain slows down leading to the observed fish
starving in green seas full of food syndrome. The bacteria strive to
optimise the ecosystem to suit themselves, eventually stealing all solar
energy in a tight loop to the exclusion of others: phytoplankton => decomposers
=> nutrients => phytoplankton.
Once their
numbers are high enough, the planktonic decomposers will attack all organisms
with thin skins, including fish larvae. In degrading seas, they are thus
the main reason for erratic fish recruitment and eventually a total collapse
of fish stocks and commercial fisheries. In this diagram the food chain
is depicted as a wedding cake, with its base tier consisting of phytoplankton
and every tier above it, much smaller. Of this whole ecosystem, fishing
takes a bite from the top, which is always a small part of the whole, even
when done to excess. Degradation on the other hand, takes a big bite from
the bottom tiers, which causes all tiers above to become smaller too (bottom-up
effect). To fishermen it even looks like overfishing, reason why it is
not being acknowledged. Marine reserves which essentially try to 'glue'
the fisherman's bite back onto the cake, cannot do the same with the bite
from bacteria, reason why they are disappointing. They fail to protect
biodiversity where degradation is found.
From what we've discussed so far, it is clear that degradation (through
eutrophication) is a formidable and uncontrollable threat that eclipses
the threat from fishing almost everywhere in the world. Where fisheries
collapsed and did not recover after a period of respite (temporary period
of relief), degradation must be suspected. It is now equally clear that
marine
reserves and fisheries management can no longer deliver where degradation
reigns (most everywhere).
While perhaps
of less importance in this review chapter, we discovered another stunning
omission in marine science, perhaps the biggest blunder of all science
over all ages. What scientists safely assumed, is that bacteria can strip
hydrogen, carbon and oxygen atoms from biomatter, leaving only liquid salts
(nutrients) for plants. However, there are energy conversion losses and
losses from living, growing and multiplying. In other words, this is not
fully possible! Decomposition in the darkness of the soil (or in the dark
deep) must stop prematurely, leaving a cocktail of short biomolecules un-decomposed.
We discovered this by measurements, and named it slush (after incompletely
molten snow). The amount of slush in the oceans is very very large, larger
than all other life on Earth combined! Animals can't eat it, plants can't
use it and neither can bacteria.
All life on Earth would have ended as soon as it began, if there were no
use for slush. But nature is not stupid. Slush is left over because
bacteria run out of energy, so once the missing energy is supplied externally,
decomposition can complete fully. We simulated this in our test vials.
In nature only plants can supply solar energy in the form of sugars.
So they team up with bacteria on their skins (roots for land plants), supplying
sugars and slime to grow in. Scientists have observed this, but could not
explain why. As plants supply small amounts of sugar enabling the decomposers
to complete their work, the symbiotic decomposers supply them the missing
nutrients and carbondioxide. In the sea it is of cardinal importance that
they also lower the alkalinity, which leads to higher productivity. In
fact, some large phytoplankters live with symbiotic decomposers on their
skins, giving them an untold advantage over others.
This knowledge
now also solves the paradox of wy corals can be so productive in seas devoid
of food and nutrients. Coral polyps live in symbiosis with plant
cells in their skins or zooxanthella(dinoflagellate symbiodinium
spp.). But these plant cells need nutrients, which they obtain by supplying
sugars to a carpet of symbiotic decomposing bacteria living in the slime
on the skin of the coral polyp. The symbiotic bacteria obtain these nutrients
by decomposing
slush which is in plentiful supply, even in seas
devoid of nutrients. Scientists have observed coral slime with bacteria
and a copious supply of sugars, but they do not know why.
Read more about these new discoveries with our Dark
Decay Assay method and our attempts to maintain a true ecosystem in
our marine aquariums. Note that our important discoveries
in 2003 and 2005 have not been acknowledged nor proved wrong by mainstream
science.
Sources of nutrients
and their effects It is true that
humans
are the cause of all their problems - no people no problems. The diagram
shows on left some human activities; in the middle the
agents
or intermediary substances and on the right their
effects on
the environment. It is mostly a two-step process. For instance, urban
development and roading is accompanied by the displacement of earth, causing
mud to enter the sea. The mud can suffocate organisms breathing and feeding
from it. It also obscures the light, leading to death of plants and plankton,
thus reducing the amount of available food. Mud also releases nutrients
which feed plankton blooms. When poisonous, these can lead directly to
fish kills, but otherwise the decomposing bacteria will do this. And so
on.
There are many arrows and perhaps even a few missing ones. Some are
fat (main problems), whereas some are thin (minor problems). The point
to remember is that we need to reduce all in size (to one quarter) if we
are serious about saving our seas. But in the meantime, human activities
and wastes are planned to quadruple in the foreseeable future. What chance
do we have? But there may be a silver lining around the dark cloud.
Most
biological processes are not linear but optimal as shown
here with how nutrients affect the growth of plants. If there are no nutrients,
plants cannot exist, corresponding to the leftmost origin (0,0) of the
curve. From there on begins an almost linear relationship A where
doubling of nutrients results in doubling of plant growth and size. But
there is a point B where more nutrients no longer have effect. From
there on it goes steeply downhill C until death follows D.
It can now be understood that degradation proceeds rapidly once it begins
(C).
The situation in our seas is now at C, and here in New Zealand
the natural situation (before people came) was below A, a sea with
a shortage of nutrients. Around large continents, the situation is different
because there is more land to supply the coast with nutrients. In places
without a continental shelf which essentially stores and recycles nutrients,
the situation is different again.
The point is that by moving back from C to B (25% improvement),
a disproportionately large improvement is experienced, and by improving
yet another 25%, the sea will be at its optimum productivity. Note that
this does not necessarily also mean optimum biodiversity, because high
biodiversity in the sea is where food is scarce.
Reader please note that this curve and its effects in
the sea have not been proved by experiment, but many other ecological experiments
produced similar curves. Read more about the principles
of degradation.
What can we do? There exists no 'silver bullet', a single solution, because humanity's
problems derive from thousands of actions by millions of people. Fortunately,
we all live on the land where the problems originate. Alas, whereas nature
is not stupid, people are. Worse still, they don't know this and we cannot
experiment by trial and error like nature did (there's no time, not enough
money). So we must use all our rationality to find the right solutions
and do the right things from the start. And guess what? The greenies who
are so concerned about our planet, do mostly the wrong things, and greenness
is now also done for profit; it is even used for political power! Read
the linked chapters carefully and despair! Not only have we stuffed up
the environment, but we degraded our minds and our media as well. We
must do the right things for the right reasons at the right time. Yet
can you mention one example where we did?
We must do the right things for the right
reasons at the right time. We owe this to our children.
At the beginning of this chapter we identified the five foremost ecological
problems with the sea, and for each we'll now present the foremost solution:
1. soil erosion Contrary to expectation,
the main cause of erosion comes from raindrop impact which increases rapidly
with raindrop size. A 5mm raindrop causes 500 times more impact energy
than a 1mm raindrop. It explains why so much erosion happens during heavy
downpours. This kind of damage can be avoided with relative ease:
grow denser crops with more foliage shielding the soil below.
leave pastures in long grass during the rainy season. Do not graze or mow
tightly.
use ground cover or mulch after baring the soil, as in urban development.
leave stubble (crop remains) on the land during the winter rains.
avoid ploughing and earthworks when it is likely to rain soon.
Read more about this in our excellent chapter on erosion
which also has other remedies.
2. soil degradation:
The main problem
with soil degradation stems from overgrazing, a term which is poorly understood.
Its main cause is inadequate recycling on the farm. For a sheep to grow,
it has to eat 10-20 times its weight in grass, which means that the grass
is recycled many times. This cycle transfers the nutrients from the sheep
to the soil and then back to the grass. If this loop is only 90% efficient,
it means that during each cycle, 10% of the fertility of the land is lost.
Multiply that with the number of cycles to raise a sheep (or other grazer),
and a farm loses 1-2 sheep to the sea for every one raised. It is an invisible
but sad loss, also harmful to the sea.
The remedy must be found in a change of mindset (way of thinking).
Farmers all too easily think that they are farming sheep (or cattle or
so) but an instance of thought makes them realise that farming grass is
a better idea. The sheep just follow from there. However, when one considers
that the vast biomass on a farm is found underground in the soil, a farmer
must revise his thinking yet again: he is primarily farming soil. If there
is less of it next year, his farming is unsustainable! From the soil, the
grass and the sheep just follow.
But what should one do to farm soil? For this one needs to study what soil
needs (see soil/fertility):
soils need moisture to survive and warmth to work best. Wind on soil must
be avoided with shelterbelts, and shade may be needed in summer but not
in winter. An excess of water (waterlogging) kills and must be prevented
by draining the soil.
soil's main food requirement is roughage (carbon). Grass plants already
sacrifice a large part of their productivity to the soil, but the farmer
must leave more foliage for the soil by not grazing his grass too short,
particularly when the soil organisms work hardest (summer). Stubble must
be returned to the soil (ploughed under) and not burnt.
farmers apply fertilisers to feed the grass, not the soil. But in doing
so, more roughage becomes available for the soil. Fertilising can easily
be overdone, which damages soil life. In productive agriculture, fertilising
is necessary to replace nutrients removed by harvests.
a soil can be enriched slowly by fertilising it in minute amounts with
the nutrient in shortest supply, usually micronutrients. This differs from
field to field and can be done only by testing the soil.
variety in plant species is needed to transfer nutrients and salts effectively
from soil to plant to animal to soil. Clean monoculture grass is not a
good idea. Allow a high diversity of species instead.
soils do not like to be trampled on and compacted, particularly when wet.
This can be managed by adapting the method of grazing to the seasons and
by providing stock camp sites.
soils do not like to be tilled or ploughed. This admits too much oxygen
and encourages those organisms that digest biomatter by 'burning' it, rather
than by decomposing it.
grazing stock spreads the fertility of a field evenly to within the fence
boundaries, but cropping does not. Cropping is in general harmful for the
soil, unless a number of intrusive precautions are taken such as contour
ploughing, seed drilling, alternative weed control and more.
3. human sewage Humans invented the water closet (WC) to get rid of human wastes.
It is an efficient method because water can be pumped with ease. The water
closet has been most beneficial to human health and to the growth of cities.
However, it is not the most ecologically-friendly way because the wastes
are not recycled back to the land. Instead they end up in a sewage treatment
plant where bacteria decompose the waste further. Such factories have become
very sophisticated, now also removing macro nutrients like phosphorus and
nitrogen. The water leaving the factory is claimed to be drinkable, because
most human pathogens (disease bacteria and viruses) died. However, the
water still remains a potent fertiliser once admitted to the sea, which
always degrades close to populated cities.
It is clear that spending more money on sewage treatment is not going to
make the problem go away. Instead, a more basic solution is required. It
is entirely feasible to pump the sewage into tanker ships, much like oil
is pumped. The tankers can then be set on a course to spread the wastes
over large areas outside the continental shelves. It is like creating a
huge diluted sewage treatment plant, millions of times larger and more
powerful than the man-made ones. The diluted sewage is converted to nutrients
by the planktonic bacteria (and some will sink to the bottom), fertilising
a piece of the ocean where nutrients are in short supply. In this manner
an entirely new fishery is created outside the continental shelves, while
at the same time the old coastal fisheries are saved. Landbased sewage
treatment will no longer be necessary.
One may wonder why this simple solution is not done or even thought
about?
4. excess fertiliser Fertilisers are used to excess where soils are no longer productive,
having lost their soil biota, such as in most cropping situations. The
crops are supposed to absorb these nutrients, but rains may get to them
first (nutrients= soluble salts). Fertilisers are also used to excess where
strong competitive pressure drives farmers to produce more from the same
land in a time when fertilisers are cheap. It is typical of dairy farming
(for milk). Fortunately, dairy farms are mostly on flat land where outwashing
by rains is not severe. Problems can be expected when dairy spreads to
less sustainable (steeper) soils. Excess fertiliser use is difficult to
combat because of competitive pressure and greed. It is also difficult
to evaluate (measure) and its harmful effects on the soil take some time
to manifest (show).
5. fishing - an example from New Zealand
but very similar elsewhere.
In New Zealand the fishery is managed by a Quota Management System,
which essentially guarantees all fish in the sea and all future catches
to a few big players (a small allowance is made for amateurs). It is not
to be proud of. Controlling such a system is tricky because of the power
of the big stakeholders. However, once rules are made, they are being adhered
to. Alas, the scientific basis of our fisheries management is still the
same as found elsewhere (Maximum Sustainable Yield at low (20% of original)
Biomass, 20%BMSY). It is not surprising then that our shellfish
fisheries collapsed and various coastal fish stocks are in trouble.
At the time of this writing (June 2009), there is a serious debate going
on between five camps:
The Government wants to pull more out of the sea in order to raise
export volume to offset our crippling Current Account deficit. (NZ spends
2 dollars overseas for every dollar it earns). If that means shrinking
the rights of amateur fishermen, so be it. The Government commissioned
Price Waterhouse Cooper, an accounting firm, to write a report! Imagine
asking bean-counters to advise on fisheries, an ecological issue. As a
result the report is exactly what one could expect.
The commercial fishermen who are essentially in control because
they hold the quotas and they pay for many bureaucratic overheads, have
the property rights. They also have inside information and experience arising
from being on the water and actually fishing it. They like controls, as
long as their catches are maximal with as little fish left in the water
as possible, while sustainability is not so important. If one stock collapses,
go for the next, and so on. They are more concerned with one rule for
all because of strong competition.
The recreational fishermen have been fighting for their first birth-right
to the fish (the right of every countryman). Because they fish in near-coastal
waters, with light gear, they want more fish in the water and if possible,
to the exclusion of commercial fishermen in these waters. They are serious
about preserving fish stocks by leaving more in the water.
The maori want to retain their traditional rights, which is akin
to what the recreational sector wants. More fish on the table by more fish
in the water.
The marine reserves brigade who want large areas in the sea closed,
preferably 20-30% because they think that this could save biodiversity
while assisting fishery. They are backed by the green component of Government.
Read more about marine reserves
in NZ.
Obviously there exists plenty of conflict. But the real issue has not been
covered, of how to manage a fishery which is in decline because of ocean
degradation. Dividing the fish is not going to work. This gives weight
to the demand of the recreational sector who want to leave more fish in
the water, with many advantages, while reducing the risk from overfishing.
It also bucks the 20%BMSY fraud and makes marine reserves unnecessary (unexploited
populations do not exist in nature). (see inconvenient
questions for the Minister of Fisheries)
The thought that we need to save the land first if we want to save
the sea, has not yet arisen in either camp. It remains in the too-hard
bucket.
At the time of writing, our section about fisheries
was not yet written. Follow the fisheries debate from the Option4
website instead.
Around the time of writing
this page, a report commissioned by the NZ Minister of Fisheries, became
available:
A review of land-based
effects on coastal fisheries and supporting biodiversity in New Zealand,
by M A Morrison et al. (2009). See the MFish web site www.mfish.govt.nz
and click on publications.
The report reviews what
is known locally and internationally about the effects of run-off from
the land on fisheries. Its 102 pages are worth reading because it shows
how little is known and that the Seafriends web site has covered this subject
extensively. It also shows how scientists still haven't grasped the importance
of planktonic decomposers, as discovered by us. Furthermore, the report
shows how scientists are exaggerating biogenic (life-forming) habitats
and their benefit to fisheries. Throughout the report, as shown by many
authors, correlation is taken as proof for causation. For instance, finding
young fish in eelgrass is taken as proof for "eelgrass being critically
important for young fish", rather than "where eelgras thrives, environmental
conditions are also good for young fish", and consequently "where
eelgrass disappears, environmental conditions for young fish are also detrimental".
However, you'll like some
statements in the summary: "Most fisheries are now managed under the
Quota Management System which generally applies Maximum Sustainable Yield
(MSY) targets, under which stocks are fished down to a level where productivity
is thought to be highest", and "It is also assumed that environmental
influences on the stock and the carrying capacity of the system remain
constant over time ..." and "These environmental impacts have happened
over the same time frame as that of the establishment and subsequent over-fishing
of, coastal fisheries, and have driven population trends in the same direction,
i.e., in a negative direction for most species (but not all)."
In other words, "The possible effects of environmental and habitat
degradation on these fished populations have been largely ignored."
[They are also ignored in fisheries models]