by simon
Why are the oceans important? The importance of wildlife.

The importance of the oceans, their wildlife and ecosystems

The land and oceans are part of one system: Earth. So when we ask, why are the oceans important? We’re asking about our own future. Life began in the ocean billions of years before the first plants or animals colonised land. Oceans regulate the state of our atmosphere because they are 99 per cent of the volume of living space for animals and wildlife is the mechanism that drives stability.

Climate change has always been the symptom of biodiversity loss … that’s to say, the breakdown of the complex connectivity between lifeforms that allows Earth to flex in response to changing conditions. Ocean wildlife has, for the large part, acted as a buffer against the most catastrophic effects and since about fifty million years ago, has kept our climate quite stable.

Industrial fishing only happened recently in our planet’s history and this reduction in the abundance of wildlife represents our greatest challenge for survival.

Below you will find a range of articles designed to inspire an understanding of the magnitude of animal impact on our oceans.

What’s more important, the ocean or the land?

The importance we bestow on the land is anthropocentric because we live there. It’s naturally important to us that we protect it. Nonetheless, if life in the ocean dies, we suffer irreversible changes to land-based ecosystems and climate.

In this article, we take a look at many of the ways that land and oceans are linked together.

The answer to the question, ‘why are the oceans important’, is that we live on the land but the oceans regulate Earth’s temperature. The oceans are equally vital to the land we live on.

Latest posts about why the oceans are important

Wildlife Conservation Artwork.The importance of wildlife: Animal Impact. Long-tailed Ducks in winter in the Baltic Sea. Drawing, Simon Mustoe.

Whenever I see a wildlife spectacle, I’m always asking myself this question … or I often get asked the same: what is this animal doing here? This isn’t the hardest question to answer, so why don’t our greatest global conservation organisations ask this? And how is leading to terrible outcomes for nature and humanity? In this blog, I’m taking a look at Long-tailed Duck, a beautiful bird that congregates in northwest European coasts in winter. Let’s answer the question, why are Long-tailed Ducks important?

Long-tailed Ducks in winter in the Baltic Sea. Drawing, Simon Mustoe.

The Baltic Sea is one of its strongholds and on the coast of Estonia is the Küdema Bay protected area, off the island of Saaremaa. It’s here that researchers from the Royal Society for the Protection of Birds (RSPB) invented a device to reduce the risk of ducks being caught in gill-nets. Their work was published in a sensational media blast last week but while it might seem like a good idea, it’s another missed opportunity to set the record straight about the sheer importance of wildlife for human survival.

More importantly, it may actually contribute to a more rapid decline of the species. Let me explain why.

Why managing wildlife is the wrong approach

Gill nets are terrible fishing devices that anchor to the seabed and indiscriminately catch everything from fish to Harbour Porpoises and Long-tailed Ducks, which dive to the seabed to feed on mollusks and crustaceans.

Naturally, scientists wanted to find a way to protect the birds, so they designed a set of rotating, flashing eyes (like the eyes on the back of a butterfly’s wings) to sit on top of marker buoys, that dissuade ducks from feeding nearby. In fact, on Twitter, RSPB Science claims:

“This googly-eyed scarecrow reduced abundance of long-tailed ducks nearby by up to a quarter”

@RSPBScience on Twitter

The objective of scaring birds away is not conservation and could only benefit wildlife if animals weren’t connected to the ecosystem at all–the device would be fine for domestic chickens and maybe even town pigeons. But the undeniable truth is, Long-tailed Ducks and their habitat cannot be disconnected, so the RSPB’s work belies their real nature, as part of the Baltic’s ecosystem function.

FACT #1 Lose the ducks and you lose the marine processes and the fish disappear with it.

FACT #2 Lose the ducks from the places they traditionally need to feed and you cause population decline, which flows onto impact other areas they occur.

I wonder if anyone has taken adequate time to explain to Baltic fishermen, the consequence to their livelihoods, of killing Long-tailed Ducks?

The ducks were there before the fisheries so if ducks don’t deplete shellfish and fish abundance, the only possible explanation for their presence, is that they are part of a mutually dependent system.

What is the point in a device that scares birds away from traditional feeding areas and protects them from being killed in fishing nets, when the fish being caught, are dependent on the birds to supply the fish in the first place?

Here’s where scientists ask … where’s my proof?

To which I answer … isn’t it obvious enough from the sheer historic abundance of these birds, that they have an integral connection to ecosystem processes? Why else would they be there?

The question of wildlife’s significance for ecosystem processes should be widely accepted but it isn’t. The mere fact it needs ‘proving’, is testament to how little most conservationists know about how ecosystems work.

Why Long-tailed Ducks are critical for ecosystem processes and fisheries

There are many studies linking seabird nutrient transfer, amplification and concentration, to fish biomass as well as climate. The bioavailable nutrients that seabirds introduce into coastal waters drives the entire food chain, because the patterns of consistent and reliable resource availability (on which fisheries also depend) have been built over thousands of years. Remove the seabirds and that structure breaks down, leading to an increase in free surplus energy, which dilutes down the food chain, leading to invasive species infestations, lowered fish biomass and ultimately, impoverished fisheries and coastal communities. It’s happening all over the world.

Massive decline of Long-tailed Ducks and numerous other seabirds from the Baltic Sea is causing the collapse of ecosystems on which fisheries depend.

Leading conservation groups like the RSPB, scientists and policy-makers right up to the UN, are failing to communicate the inherent importance of wildlife to food security and climate. Combined with desperate measures to protect rapidly-declining species’ from extinction, this is creating problems for advocacy and outcomes. Until people are retrained in key principles, there seems to be little hope of winning over support from the general public, including Baltic Fishermen. Instead, we end up making matters worse.

The scale, magnitude and intensity of impacts of Long-tailed Ducks on the Baltic environment

Let’s take a fresh look at the scale, magnitude and intensity of impacts of Long-tailed Ducks on the Baltic environment – this time, in terms of their impact on the ecosystem.

Long-tailed Ducks are one of three species of sea duck accounting for 80% of the birds wintering in the Baltic Sea [1]. Surveys suggest that the Baltic Sea population in 2007-2009 was about 1.5 million birds, down from 4.2 million in 1992-1993, a decline of 65% but an 83% decline in the region where the RSPB research was done (down from 1,095,000 to 182,000). It’s very likely that most of the region’s birds will pass through the Baltic at some point during winter.

Let’s assume in the distant past, the numbers were double the 1992-1993 estimates. Ten million Long-tailed Ducks would have been cultivation grazing mussels, clams, periwinkles and crabs, reintroducing bioavailable nutrients for several months of the year, concentrated at locations with the greatest accumulated biomass of other animals –whale, dolphins and porpoises, seabirds and fish. All in all, this annual flourish of activity provided the basis for a monumental, seasonal bounce-back, maintaining levels of water quality, food biomass and fisheries, on which human coastal cities were established.

All of this is lost, if the ducks are lost.

In one study in the Gulf of Gdańsk in 1995 [2], it was found that Long-tailed Ducks consumed a total of 6,350 tonnes of bivalves (such as mussels), 1,120 tonnes of fish, 400 tonnes of crabs and other crustaceans and about 325 tonnes of other prey (a total of 8,195 tonnes). Assuming a 65% decline since 2007-2009 and double the population in the mid-century, the Gulf’s Long-tailed Duck population could have been about 116,000 birds [1] – meaning a mid-1990s total Baltic Sea prey consumption in the order of 1.2 million tonnes per year.

Distribution and density of wintering Long-tailed Duck Clangula hyemalis in the Baltic Sea, 2007–2009 [1].

In the mid-1970s, total fisheries catch in the Baltic Sea was about 850,000 -990,000 tonnes. Today, globally, seabirds consume about the same as world fisheries and aquaculture combined, so it’s no surprise to me, to find that sea ducks are so significant.

Final point – remember, the ducks were there before the fisheries so if ducks don’t deplete shellfish and fish abundance, the only possible explanation for their presence, is that they are part of a mutually dependent system. There is no other explanation for the presence of super-abundant wildlife, than they are part of the functioning of the ecosystem and in this case, fisheries are completely dependent on their ongoing presence!

Long-tailed Ducks, particularly juveniles, prey selectively on crustaceans. Today, there are invasive crabs destroying mussel beds in the Baltic and causing an imbalance in the benthic ecology, leading to declining fish habitat. Is that any surprise, when you’ve reduced the influence of millions of stabilising predators?

Conservationists and primary industry must change their way of thinking about ecosystems and wildlife

The harsh reality is, that massive decline of sea ducks including Long-tailed Ducks from the Baltic Sea is causing the collapse of ecosystems on which fisheries depend.

If bordering nations want more fish, they need to reverse the sudden and catastrophic decline in Long-tailed Ducks … and the conservation NGOs must not be part of initiatives that dissuade the birds from feeding at traditional locations (and that goes for other declining wildlife too–deliberate underwater noise is now being used to scare Harbour Porpoises away).

There are countless examples all over the world of massive and rapid decline in biodiversity values as a result of taking away large biomass of top predators. It’s not rocket-science.

Conservationists over-simplify the situation and look at numbers of wildlife, rather than ecosystem processes. If you search for ‘conservation of Long-tailed Duck’ on Google, you’ll find lots of studies of what they eat and what they are ‘dependent’ on. You will find nothing that draws the connection between the immense numbers of birds and the nutrient processes that deliver rich fishing grounds.

You’ll read industry studies about the collapse of fishing, reduced quotas and maybe even ‘competition’ for fish, with seabirds and marine mammals but such opinions are dangerously incorrect.

Very few conservation scientists are able to explain why wildlife is important. Few ecologists with relevant experience are being consulted about the underlying problem – the collapse of animal-driven ecosystem structure, function and process.

Just in the same way humans believe we are capable of ‘managing’ our way out of a free-fall wildlife extinction crisis, we think that over-fishing is the principle cause of fish decline. It’s a factor, yes, but what we’ve really done is broken the food bowl. The leaks are happening so fast now, that we don’t have much time left to get this right.

We’ve smashed the system that provides for us and the only way we’re getting that back, is to start protecting and restoring animal populations.

References

  1. Henrik Skov, Stefan Heinänen, Ramūnas Žydelis, Jochen Bellebaum, Szymon Bzoma, Mindaugas Dagys, Jan Durinck, Stefan Garthe, Gennady Grishanov, Martti Hario, Jan Jacob Kieckbusch, Jan Kube, Andres Kuresoo, Kjell Larsson, Leho Luigujoe, Włodzimierz Meissner, Hans W. Nehls, Leif Nilsson, Ib Krag Petersen, Markku Mikkola Roos, Stefan Pihl, Nicole Sonntag, Andy Stock, Antra Stipniece and Johannes Wahl. (2011) Waterbird Populations and Pressures in the Baltic Sea Nordic Council of Ministers, Copenhagen 2011.
  2. Stempniewicz, Lech. (1995). Feeding ecology of the Long-tailed Duck Clangula hyemalis wintering in the Gulf of Gdańsk (southern Baltic Sea). Ornis Svecica. 5. 133-142.

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