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How To Save Big Cats | Earth Wise

March 1, 2023 By EarthWise 1 Comment

Researchers suggest the best way to save large and often endangered carnivores

Big cats are among the most widely recognized and admired animals in the world. But these charismatic predators face many and varied threats, including the loss of habitat and prey, conflicts with humans, poaching, and the illegal wildlife trade.

Researchers from the University of Reading in the U.K. have studied the fortunes of 50 species of large carnivores worldwide over the past 50 years.  They found that social and economic factors, such as quality of life, were more closely associated with declines of large carnivore species than purely environmental factors, like habitat loss.   

The study, which was recently published in the journal Nature Communications, suggests that the best way to save large carnivores, including lynx, bears, and lions, is to encourage a sustainable model of social and economic development instead of focusing exclusively on issues like climate change.  

While rapid economic development pushes species to the brink of extinction, it’s also delivered enormous improvements in the quality of human life. But the analysis suggests that once people achieve a high quality of life and economic development slows, a turning point is reached and persecuted species have a chance to recover.

According to the research team, the recovery is a result of both improved habitat protections in advanced economies and a more harmonious relationship between people and predators.  What would have once been considered a dangerous pest is now recognized as being an important part of both the ecosystem and culture.  

In Western Europe, slower economic development and an improved quality of life have allowed populations of grey wolves to increase 1,800% since the 1960s.

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Economics trump environment to save big cats, say ecologists

Photo, posted February 8, 2015, courtesy of Mathias Appel via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Carnivores Eating Human Food | Earth Wise

December 1, 2020 By EarthWise Leave a Comment

Carnivores increasingly relying on humans for food

A recent study by ecologists at the University of Wisconsin-Madison has found that carnivores living near people often get more than half of their diets from human food sources rather than from their traditional prey.  This represents a major lifestyle disruption that puts North America’s carnivore-dominated ecosystems at risk.

The researchers studied the diets of seven predator species across the Great Lakes region using bone and fur samples taken from animals from areas as remote as national parks to metropolitan areas including Albany, New York.  What they found – unsurprisingly – is that the closer carnivores lived to cities and farms, the more human food they ate.  Dietary contributions of human food varied with species, but on average was more than 25% in most human-altered habitats.

The researchers studied the diets of carnivores like bobcats, coyotes, red and gray foxes, fishers, and American martens by chemical analysis of samples from Minnesota, Wisconsin, upstate New York, and the Upper Peninsula of Michigan.  The diets of the animals could be analyzed on the basis of the carbon content of bone and fur samples.  Human food, heavy in corn and sugar, lends these samples a distinctive carbon isotope signature.  In contrast, prey species confer their own carbon signatures.  The ratio of these isotope fingerprints provides information on the proportion of an animal’s diet that came from human sources.

Relying upon human food increases how much carnivores overlap one another in their competition for food.  Compared to when these predators vie for distinct prey, there can be more conflicts between animals.  Changing how a species gets their food can have far-ranging effects on ecosystems.

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Carnivores living near people feast on human food, threatening ecosystems

Photo, posted August 18, 2007, courtesy of Jitze Couperus via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Coexisting With Dangerous Carnivores

February 16, 2016 By WAMC WEB

https://earthwiseradio.org/wp-content/uploads/2016/02/EW-02-16-16-Coexisting-with-Carnivores.mp3

We come across many things that we don’t like but that are nonetheless good for us or good for the world in general.   On some level, we all make cost-benefits analyses to decide what to do about various things that we might just as soon do without.

[Read more…] about Coexisting With Dangerous Carnivores

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