More sightings of an endangered species don’t always mean it’s recovering

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Leadbeater’s possum sightings are up – but that doesn’t mean the critically endangered species is recovering.
David Lindenmeyer, Author provided

David Lindenmayer, Australian National University

If more sightings of an endangered species are recorded, does that mean its numbers are increasing? Australia’s native forest logging industry is arguing yes.

On the basis of an increase in sightings of Leadbeater’s possums, advocates for Victorian native forest logging industry has proposed to downgrade the possum’s conservation status from critically endangered (thus facilitating ongoing logging in and around potential habitat in Victoria’s Central Highlands).

But while this sounds reasonable, increased sightings aren’t always a reliable measure of endangered species’ viability. Often, an increase in sightings can be attributed to two things: either more people are trying to spot the animal in question; or new work that has used different parameters to previous studies.

Read more: Victoria must stop clearfelling to save Leadbeater’s possum

Why more sightings may not mean species recovery

One of the ultimate achievements in successful conservation is to downlist a threatened species – for example from critically endangered to endangered, or from endangered to vulnerable. But this requires high-quality, long-term survey data that shows substantial recovery, as well as proof that the key threats to a species’ persistence have been truly mitigated.

An example of a failure to do due diligence was the woylie in Western Australia, (also known as the brush-tailed bettong). It was downlisted in 1996 but then within 3 years suffered an enormous and still not well understood population crash (from which it has still not recovered). Its conservation status was uplisted in 2008.

There have been more records of Leadbeater’s possum in the last few years, but this growth is most likely a function of a large increase in the amount of effort invested in trying to find them.

In areas zoned for timber harvesting, locations with a confirmed Leadbeater’s possum sighting are excluded from logging. This has motivated large numbers of people who are concerned about the plight of the possum to devote many hours to finding animals.

The detection of more animals with greater searching is a well-known phenomenon in ecology and other disciplines. Last year, for example, sightings of wild tiger populations rose by 22% – but further investigation found that the increase was most likely caused by changes in methodology and greater effort in surveying.

Read more: Australia’s species need an independent champion

In fisheries this relationship is termed catch per unit effort. For example, even with rapidly declining numbers in a fishery, the number of fish caught can stay the same or even go up when more efficient and targeted techniques are adopted. Sadly, this intensified effort can often cause fish stocks to collapse.

The real evidence on Leadbeater’s possum

As stated earlier, the first critical piece of evidence required to justify downlisting is robust evidence of long-term improvement in population size. So what does the evidence tell us about Leadbeater’s possum?

For more than 34 years, the Australian National University has monitored Leadbeater’s possum including at more than 160 permanent sites since 1997. This large-scale, long-term data set shows that the possum is in significant decline. Over the past 19 years, the number of survey sites where the possum was detected has dropped by almost two-thirds.

The second critical requirement for delisting is evidence that the key processes threatening the species have been mitigated.

One of the principal threats facing Leadbeater’s possum is the rapid ongoing decline in large old trees which are the sole form of natural nesting sites for the species.

As part of ecological surveys in the wet forests of Victoria, which have been running since 1983, the Australian National University has been collecting information on hollow-bearing trees. The most recent analysis of this large and long-term data set suggests that if current declines continue, by 2040, populations of large old trees may be less than 10% of what they were in 1997.

Another key threatening processes which has not been addressed is fire. Victoria’s wet ash forests are extremely fire prone, in part because forests that regenerate after logging are significantly more likely to burn at elevated severity.

The significant risks facing the mountain ash forests in which Leadbeater’s possum lives has resulted in the forest itself being classified as critically endangered.

No grounds for reducing the conservation status

Efforts to downlist Leadbeater’s possum are misguided at best. The greater number of records in recent years is most likely a reflection of greater survey effort. In contrast, robust long-term monitoring data clearly shows a significant decline in population.

Most importantly, the key processes causing the decline of Leadbeater’s possum (and other threatened species in the same area, like the greater glider) have not been mitigated; indeed they are intensifying (such as the increasing fire burden with increasing area of logged forest).

There is little room to gamble with these species. Leadbeater’s possum and the greater glider currently do not breed in captivity, so expensive fallback options like captive breeding and reintroduction are not viable possibilities if wild populations crash.

The loss of these animals from ill-informed downlisting would add to Australia’s already appalling record on species loss. Approximately 10% of our mammal fauna has gone extinct – the worst rate in the world, and 30 times worse than places of equivalent size, such as the United States.

The ConversationMore formally protected areas, and not downlisting their conservation status, is the most scientifically robust option for the conservation of this iconic animal.

David Lindenmayer, Professor, The Fenner School of Environment and Society, Australian National University

This article was originally published on The Conversation. Read the original article.

Is it too cheap to visit the ‘priceless’ Great Barrier Reef?

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Would you pay more if you thought it would help?
Wikimedia Commons, CC BY-SA

Michael Vardon, Australian National University

The Great Barrier Reef is one of the world’s finest natural wonders. It’s also extraordinarily cheap to visit – perhaps too cheap.

While a visit to the reef can be part of an expensive holiday, the daily fee to enter the Great Barrier Reef Marine Park itself is a measly A$6.50. In contrast, earlier this year I was lucky enough to visit Rwanda’s mountain gorillas and paid a US$750 fee, and the charge has since been doubled to US$1,500.

To me, seeing the reef was better than visiting the gorillas. Personally, I would be happy to pay more to visit the Great Barrier Reef. Does this mean we’re undervaluing our most important natural wonder? And if we do ask visitors to pay a higher price, would it actually help the reef or simply harm tourism numbers?

Read more: Money can’t buy me love, but you can put a price on a tree

Putting dollar values on the natural world can be a heated topic. Earlier this year Deloitte Access Economics valued the Great Barrier Reef at A$56 billion “as an Australian economic, social and iconic asset”, but was met with the retort that its true value is priceless.

The A$56 billion estimate was based on surveys that measured “consumer surplus and non-use benefits”. This common research technique involves asking people what they would be willing to pay to get a particular benefit. For example, the entrance fee for the reef is A$6.50 but if I am willing to pay A$50 (say), that equates to a consumer surplus of A$43.50. In other words, I am receiving A$43.50 worth of value that I did not have to pay for.

I understand that some people instinctively object to the idea of trying to put monetary values on things like the Great Barrier Reef. But I think valuation helps, on balance, because it offers a way to assimilate environmental information into the economic processes through which most decisions are made. Money makes the world go around, after all.

However this should be done on the proviso that the valuation is systematic and based on sound environmental and economic data.

Accounting for the Great Barrier Reef

The process by which these values are calculated is called “environmental accounting”, and estimates have to meet international standards known as the System of Environmental-Economic Accounting or SEEA in order to be valid. This builds on the System of National Accounts (which among many other things gives us the GDP indicator). In this accounting, as in business accounting, the values recorded are exchange values – that is, what someone paid (or was likely to pay) for a good, service or asset. For assets that aren’t regularly traded, this figure can be based on either previous sales or expected future income.

It does not use willingness-to-pay measures. The Deloitte report also estimated exchange values in line with accounting values, with the Great Barrier Reef contributing A$6.4 billion to the economy through tourism, fishing, recreation, and research and scientific management.

The Australian Bureau of Statistics has a huge amount of data on the Great Barrier Reef, covering the physical state of the reef and its surroundings, the economic activity occurring in the region, and more besides.

Unsurprisingly, tourism is the region’s most valuable industry, contributing A$3.8 billion in gross value added in 2015-16 (see Table 1 here). That year the Marine Park had 2.3 million visitors, who together paid just under A$9 million in park entry charges (see Table 4 here).

Ecosystem services are the contributions of the natural world to benefits enjoyed by people. For example, farmers grow crops that are pollinated by insects and use nutrients found in the soil. These things are not explicitly paid for, but by examining economic transactions we can estimate their value.

Surprisingly, the value of ecosystem services used by tourism was A$600 million – just half the value of the ecosystem services used by the agriculture industry.

Value of ecosystem services (in millions of dollars) used by selected industries in the Great Barrier Reef Region in 2014-15.

The result is partly explained by the way things are valued. Agricultural products are bought and sold in markets, whereas the Great Barrier Reef is a public asset and the fee for visiting it is set by governments, not by a market.

On these numbers, paying A$6.50 to visit one of the great treasures of the world is a bargain indeed. But what does it mean for the reef itself?

Reef under threat

The reef is under pressure from many factors, including climate change, nutrient runoff, tourism impacts, and fishing. Managing the pressure requires resources, and it makes sense to ask those who use it to pay for it.

Increased funding to help manage these pressures would therefore be good. What’s more, governments could conceivably also use natural resources to generate money to fund other public goods and services, such as roads, education, health, defence, and so on.

Before you protest at this idea, ask yourself: why should the Great Barrier Reef not be used to generate revenue for government? Other natural resources are used this way. The federal and Queensland governments are pursuing economic benefits from the coal in the nearby Galilee Basin. If government revenue from the Great Barrier Reef were increased, it might reduce the need for revenue from elsewhere.

So what next?

Environmental accounting offers a clear way to assess such trade-offs, and will hopefully lead to better decisions. To achieve this we will need:

  • Regular environmental-economic accounts from trusted institutions like the ABS
  • Governments and business to incorporate this new accounting into their strategic planning and management (including, in the case of the Great Barrier Reef, assessing the likely revenue from increased marine park fees)
  • The public to use the accounts to hold our government and business leaders to

The ConversationThe last will no doubt make some uncomfortable, while the second will take some time. The first is already a reality. I hope others take the time to understand and analyse the accounts already available, and that we get as much debate about managing the environment as we do about managing the economy.

Michael Vardon, Visiting Fellow at the Fenner School, Australian National University

This article was originally published on The Conversation. Read the original article.