Some essentials on coexisting with carnivores

Coexisting with carnivores can be a challenge, but their value makes it worthwhile, as Professor John Vucetich and Professor David Macdonald explain

The well-being of many human communities depends on healthy forests and grasslands. Those ecosystems can be degraded by over-browsing and over-grazing by large herbivores – moose, deer, elk, gazelles and so forth. That overconsumption is far less likely to occur when large herbivores are limited by healthy populations of large carnivore – wolves, lions, lynx, wolverine, bears, etc. Moreover, ecosystems with healthy populations of large carnivores tend to have greater levels of overall biodiversity. In a nutshell, and at risk of glossing over details, the conservation community has concluded that large carnivores have great ecological value.

Nevertheless, human communities often find it difficult to live near populations of large carnivores. Difficulties arise in three ways. First, carnivores kill domestic livestock, which provides for the well-being of some humans. Carnivores do not kill for malice; they do so because their well-being depends on it. Moreover, carnivores would naturally prey on wild animals. In many cases, however, the wild prey have been displaced by domestic livestock.

Second, carnivores kill wild prey that is also hunted by humans for subsistence or recreation. In this way, large carnivores are treated as competition to be eliminated.

Third, some species of large carnivores, on some occasions, threaten and take human lives. Important examples include human-eating lions in portions of Africa and human-eating tigers in portions of south Asia.

While these three elements of conflict are real, they are also frequently and grossly exaggerated. In the United States, for example, the impacts of wolves on livestock and hunting are very small and wolves do not pose a threat to human safety1. Yet, these concerns are an important fuel for wolf persecution.

Under threat

Genuine and perceived threats lead to humans killing carnivores at high rates through illegal poaching and legal culling and hunting. The result of all this killing is that two-thirds of the world’s carnivore species are threatened with extinction and most places do not have their native compliment of carnivores. The end point of treating this conflict – as humanity has thus far – is irreversible extinction and gross mistreatment of carnivores that manage to persist. An important element of this conflict concerns the received and oft-repeated motivation offered for why carnivores should be treated better: because they are ultimately of value to humans. The genuine wellbeing of humans is an important reason to conserve, but it is not the only one and alone it is inadequate.

European colonists and their descendants drove various large carnivores to extinction over a substantial portion of eastern North America. Britain drove its large carnivores – wolves, lynx and brown bears – to extinction centuries ago. It is difficult to mount a case that the wellbeing of those humans is worse as a result of those extinctions. When an object (think, carnivores) is valued only for its utility, its utility may go unrecognised, be outweighed by costs of maintaining it, or replaced by a substitute. This is not a denial of carnivores’ utility, but an acknowledgement of the risk in valuing something only for its utility. As such, nature’s utility is an (important, but) insufficient motivation for conservation.

Conserving carnivores

What if, carnivores are valuable, not only for advancing human wellbeing but also because they have a value in their own right? What if, we have an obligation to treat carnivores fairly and with at least some concern for their wellbeing? The response to those questions begins with the supposition that humans possess this kind of value and are entitled to this kind of treatment because we have interests (e.g., to avoid pain and to flourish). It follows that any entity with such interests would also possess this kind of value. Because all vertebrate organisms possess those interests, they also possess this kind of value and deserve this kind of treatment. The force and universality of this reasoning are indicated by the principle of ethical consistency, i.e., treat others as you would consent to be treated in the same position. Most human cultures are undergirded by some variant of this principle (e.g., golden rule). This intrinsic value of at least some non-human portions of nature is widely acknowledged – reflected by sociological evidence and many instances of laws and policies. Ethicists encapsulate these ideas by saying that carnivores (and many other forms of life) possess intrinsic value2.

Future success in carnivore conservation will depend, in part, on better understanding ideas that will foster effective and fair mitigation and adjudication of conflict, especially:

  • The extent to which conservation can be achieved through protected areas and land-sparing, opposed to land sharing3;
  • Mechanisms of socioeconomic behaviour that adversely impact carnivores. Some elements may be underappreciated (e.g., wealth inequality,4) and other elements may be favourable to conservation (e.g., tendency to increasingly embrace nature’s intrinsic value with increasing economic development,5);
  • How to subsidise coexistence by compensating those adversely affected by living with carnivores. The challenge is tailoring compensation in ways that are fair and effective, yet do not foster, e.g., perverse incentives, additionality, or leakage6;
  • How to best juxtapose the values of conservation and social justice in a manner that genuinely honours the intrinsic value of carnivores without being misanthropic7.

Conservation is no longer limited by ecological knowledge about carnivores’ ecological value or needs. Increasingly, the limiting factor is an effective application of knowledge arising from the synthesis of social sciences, social justice and conservation.

1 Vucetich (2016), Oversight Hearing, United States House Of Representatives. https://www.gpo.gov/fdsys/pkg/CHRG-114hhrg21616/pdf/CHRG-114hhrg21616.pdf

2 Vucetich et al. (2015), Conserv Biol, https://doi.org/10.1111/cobi.12464

3 Fischer et al. (2014), Conserv Biol, https://doi.org/10.1111/conl.12084

4 Holland et al. (2009), Conserv. Biol., https://doi.org/10.1111/j.1523-1739.2009.01207.x

5 Bruskotter, Vucetich, et al. (2017), BioScience, https://doi.org/10.1093/biosci/bix049

6 Dickman, Macdonald, & Macdonald (2011), Proc Natl Acad Sci, USA. https://doi.org/10.1073/pnas.1012972108

7 Vucetich & Nelson (2010), BioScience,https://doi.org/10.1525/bio.2010.60.7.9

 

Professor John A. Vucetich

School of Forest Resources and Environmental Science

Michigan Technological University

javuceti@mtu.edu

 

Professor David W. Macdonald

Wildlife Conservation Research Unit

The Recanati-Kaplan Centre, Department of Zoology

University of Oxford

david.macdonald@zoo.ox.ac.uk

 

Source: http://www.adjacentopenaccess.org/farming-environment-marine-sustainable-news/essentials-coexisting-carnivores/35223/

2013 Arctic Report Card: Reindeer and caribou numbers low, winter ranges small

Aerial image of the Western Arctic Caribou herd, 2011. Jim Dau / ADF&G

Caribou and reindeer—members of theRangifer genus—are hunted and herded by many Arctic and Subarctic societies, which is why it’s natural to imagine that reindeer would be tasked with pulling Santa’s sleigh to and from the North Pole. Rangifer populations have fluctuated in number historically, but currently many wild herds have unusually low numbers and their winter ranges in particular are smaller than they used to be.

The map shows the current status of 24 major migratory tundra reindeer and caribou herds. Green indicates increasing populations; red indicates decreasing numbers; black and yellow indicate populations have remained stable either on the high or low end of their historic numbers. Only a few herds are increasing or are stable at high numbers; the most recent population estimates indicate that most herds continue to decline or remain at low numbers after severe declines.

Just as scientists try to figure out the causes behind climate cycles, wildlife experts are trying to understand what is behind cycles in herd populations. Local and traditional knowledge indicates that caribou go through periods of abundance and scarcity every 40-60 years. The size of individual herds has varied greatly since 1970 when population estimates began. Since it is normal for herds to vary in size over time, scientists are still uncertain whether the current low numbers are natural or perhaps driven by some of the rapid changes in the Arctic environment. For some herds, their current ranges are approaching the low end of their historic extent.

In the United States, there are four distinct herds of caribou in Alaska—two that are decreasing in number and two that are increasing. The Western Arctic herd—the state’s largest—reached a population low of 75,000 in the mid-1970s, and then rebounded during the 1980s and 1990s to reach a peak of 490,000 in 2003. The herd then declined to 325,000 in 2011. While the herd is still very large, the Alaska Department of Fish and Game says it may become necessary to reduce harvests in the future if this decline continues.

Many countries are attempting to stabilize population numbers through harvest management. Beginning in 2000, Greenland began to allow hunting to reduce caribou populations. Despite this, surveys indicated that the largest herd, the Kangerlussuaq-Sisimiut, remained at around 98,000 animals. The second largest, Akia-Maniitsoq, decreased from an estimated 46,000 in 2001 to about 17,400 in 2010. One possible cause might be differences in topography: hunting access is easier in the Akia-Maniitsoq territory compared to the rough, mountainous terrain that the Kangerlussuaq-Sisimiut inhabits.

Between the 1950s and 1970s, Russia’s Taimyr Herd—one of the largest in the world—increased from 110,000 to 450,000 in 1975. Even after commercial hunting increased, the herd held to a size of about 600,000 animals. When subsidies to commercial hunters were removed, hunting declined and the herd grew rapidly by 2000 to 1 million animals. Currently the herd is assumed to have declined to about 700,000 animals.

More information about individual migratory Rangifer herds in the Arctic can be found in the Migratory Tundra Rangifer chapter of the Arctic Report Card: Update for 2013.

Map by NOAA Climate.gov, based on rangifer migratory range data provided by Don Russell. 

The Western Arctic Caribou Herd has been declining at a rate of 4 to 6 percent a year since the population peaked in 2003 at 490,000 animals, said Jim Dau, a Kotzebue-based biologist with the Alaska Department of Fish and Game. “I don’t see any indication that that’s about to turn around,” Dau told the Western Arctic Caribou Herd Working Group at its annual meeting in Anchorage.

The last official population estimate, released in 2011, put the herd at 325,000 animals. An updated estimate is expected next spring, Dau said. Biologists are examining aerial photos and other data to come up with a number for the size of the herd, which roams over much of northwestern Alaska.

Population could slip to about half its 490,000 animal peak

So far, biologists have documented increased mortality for adult females and decreased survival for calves, a combination that bodes poorly for population numbers, Dau said.

“Maybe even this year, we could slip below 265,000 animals,” triggering more conservative management and more hunting restrictions, he said.

Such a drop would mean the herd had lost 60,000 animals, or almost 20 percent of its population, since the last count two years ago.

Some factors appear ruled out as causes for the decline, Dau said. The number of animals hunted has been stable over several years, so overharvesting should not be a big factor, he said. Still, even though the total harvest has not increased, hunters are now taking about 5 percent of the herd, compared to 3 percent in past years, he said.

The road and other facilities associated with the Red Dog Mine — the world’s largest zinc producer and the only industrial development in the caribou habitat — also seem blameless, as caribou have easily migrated across that area, he said. There is no sign of significant disease outbreaks or parasite infestations, he said.

Male caribou in Alaska

Male caribou in Alaska (Photo credit: Wikipedia)

But some potential culprits have emerged — too little lichen and too much ice.
The Bureau of Land Management has documented an incremental shift from lichen — the caribou’s preferred food — to grasses and shrubs in the animals’ winter range, Dau said. But at the same time, starvation does not seem to be a major problem for the caribou.  “We’re seeing fewer skinny caribou now than we used to see,” Dau said, but those animals that are malnourished seem to be much more vulnerable to wolf predation, he said.

Weather oddities, possibly resulting from climate change, could also be taking a toll on the caribou, Dau said. There is more freezing rain falling in the region, creating hazardous conditions for the animals. Just three weeks ago, Kotzebue endured four to six days of a rain-snow mix that coated the area with ice.

“Icing events seem to be more common now that fall weather is more mild,” Dau said. Effects can be seen on caribou bodies, with white patches of accumulated ice forming between the eyes and areas of shorn fur cut by sharp ice edges.

Past icing events have hurt animals around Alaska, including the Western Arctic caribou.

Movement across the land became difficult, and ice on the ground was a barrier to food sources.

Amid the extremely mild fall of 2013, the caribou migration south was late and unusually crowded, with “a very discrete leading edge,” Dau said. “If you were south of that leading edge, you wouldn’t know there was a caribou in northwestern Alaska,” he said. “If you were below that edge, you were surrounded by tens of thousands of caribou.”

The population information is sobering, said members of the Western Arctic Caribou Herd Working Group, an advisory group representing village residents, hunters, reindeer herders, environmentalists and guides.

Roy Ashenfelter, chairman of the working group, said members should let villagers and hunters elsewhere know about the declines “so that when changes come about, it’s not a surprise.” Though hunting did not cause the problem, hunters should prepare to be part of the solution, he said. “One of the things we’ve learned is to not wait until the last minute and tell the public, ‘Hey, here are some restrictions,’” he said.

Sources: https://www.alaskadispatch.com/article/20131209/alaskas-western-arctic-caribou-herd-numbers-continue-slide

http://www.climate.gov/news-features/featured-images/2013-arctic-report-card-reindeer-and-caribou-numbers-low-winter-ranges