December 04, 2012
Female lion with wildebeest kill in Tanzania. Photo by: Rhett A. Butler.
"There is evidence of strong declines and even extirpation of lions in some range countries. Especially in West and Central Africa, declines have been dramatic and conservation measures are urgent," the researchers write. "While lions are protected in some of the lion areas, in many they are not, and in others they are hunted."
The study found that 24,000 lions (about 75 percent of the total) are located in ten strongholds, all of which are found in either East or Southern Africa. Tanzania alone contains 40 percent of the global population.
Yet, about 6,000 animals (18 percent) are in populations where "long-term viability" is at risk. The study also found extinctions of local lion populations even in protected areas.
"This research is a major step in helping prioritize funding strategies for saving big cats," said co-author Luke Dollar with National Geographic’s Big Cats Initiative (BCI), which helped fund the study. "The research will help us better identify areas in which we can make a difference.”
The area that requires the most urgent action is West Africa, which according to the study houses only about 525 lions.
"[West Africa] has no large population remaining and lions now absent from many of the region’s national parks," the authors write.
Worryingly, West African lions are a distinct population, and is considered by some to merit its own subspecies: Panthera leo senegalensis. Recent genetic studies have even suggest that West African lions are more closely related to Asiatic lions than their continental cousins.
"Giving these lions something of a fighting chance will require substantial increases in effort. The next 10 years are decisive for [West Africa], not just for lions but for biodiversity, since lions are indicators of ecosystem health," co-author Andrew Jacobson, also with Duke University, said.
One of the primary threats to Africa's lion is habitat loss. Their savannah ecosystems are experiencing widespread conversion due to expanding agriculture and urbanization, exacerbated by a massively growing human population across much of Africa. In addition, lions are facing increased human-wildlife conflict. Where they pose threats to livestock, they are often speared, poisoned or poached. Legal hunting may also be taking a significant toll, especially given its focus on male lions. Finally, there are concerns that lions are being killed for Chinese traditional medicine as replacement for tiger bones.
The study's estimate, ranging from 32-35,000 lions, falls in the middle of other estimates during the decade, ranging from about 20,000 to 40,000 lions. The IUCN Red List currently classifies the lion as Vulnerable.
Male lion in a zoo. Photo by: Rhett A. Butler.
CITATION: Jason Riggio, Andrew Jacobson, Luke Dollar, Hans Bauer, Matthew Becker, Amy Dickman, Paul Funston, Rosemary Groom, Philipp Henschel, Hans de Iongh, Laly Lichtenfeld, Stuart Pimm. The size of savannah Africa: a lion’s (Panthera leo) view. Biodiversity Conservation. 2012. DOI: 10.1007/s10531-012-0381-4.
Africa's great savannahs may be more endangered than the world's rainforests
(12/04/2012) Few of the world's ecosystems are more iconic than Africa's sprawling savannahs home to elephants, giraffes, rhinos, and the undisputed king of the animal kingdom: lions. This wild realm, where megafauna still roam in abundance, has inspired everyone from Ernest Hemingway to Karen Blixen, and David Livingstone to Theodore Roosevelt. Today it is the heart of Africa's wildlife tourism and includes staunch defenders such as Richard Leakey, Michael Fay, and the Jouberts. Despite this, the ecosystem has received less media attention than imperiled ecosystems like rainforests. But a ground-breaking study in Biodiversity Conservation finds that 75 percent of these large-scale intact grasslands have been lost, at least from the lion's point of view.
Illegal hunting threatens iconic animals across Africa's great savannas, especially predators
(10/25/2012) Bushmeat hunting has become a grave concern for species in West and Central Africa, but a new report notes that lesser-known illegal hunting in Africa's iconic savannas is also decimating some animals. Surprisingly, illegal hunting across eastern and southern Africa is hitting big predators particularly hard, such as cheetah, lion, leopard, and wild dog. Although rarely targets of hunters, these predators are running out of food due to overhunting and, in addition, often becoming victims of snares set out for other species.
Picture of the day: the maned lioness
(10/15/2012) The title is not a typo. Sometimes lioness grow manes as rich and large as males, and there appears to be larger proportion of such 'maned lionesses' in Botswana's Okavango Delta.
King of the jungle: lions discovered in rainforests
(08/13/2012) Calling the African lion (Panthera leo) the 'king of the jungle' is usually a misnomer, as the species is almost always found in savannah or dry forests, but recent photos by the Germany-based Nature and Biodiversity Conservation Union (NABU) document lions in Ethiopian rainforests. Taken in the Kafa Biosphere Reserve, the photos show a female lion hiding out in thick montane jungle.
New campaign targets snares in effort to save world's big cats
(06/05/2012) Last summer, a wild Sumatran tiger—one of only a few hundred surviving on the island—made news in a story that did not have a happy ending. The cat had become entangled in a snare in a logging concession owned by Asia Pulp and Paper (APP). The tiger spent seven days without food or water before wildlife rangers found it, but its snared right paw was a bloody black mess. Although the rangers were able to sedate and free the cat, it died shortly thereafter from its wounds.
Decline in top predators and megafauna 'humankind’s most pervasive influence on nature'
(07/14/2011) Worldwide wolf populations have dropped around 99 percent from historic populations. Lion populations have fallen from 450,000 to 20,000 in 50 years. Three subspecies of tiger went extinct in the 20th Century. Overfishing and finning has cut some shark populations down by 90 percent in just a few decades. Though humpback whales have rebounded since whaling was banned, they are still far from historic numbers. While some humans have mourned such statistics as an aesthetic loss, scientists now say these declines have a far greater impact on humans than just the vanishing of iconic animals. The almost wholesale destruction of top predators—such as sharks, wolves, and big cats—has drastically altered the world's ecosystems, according to a new review study in Science. Although researchers have long known that the decline of animals at the top of food chain, including big herbivores and omnivores, affects ecosystems through what is known as 'trophic cascade', studies over the past few decades are only beginning to reveal the extent to which these animals maintain healthy environments, preserve biodiversity, and improve nature's productivity.
Conservation groups propose ban on lion parts in US
(03/02/2011) It's not widely known that the African lion ((Panthera leo) is currently threatened with extinction in the wild, but listed as Vulnerable by the IUCN Red List, the king of animals has declined by over 90% in the past 50 years (from 450,000 lions to between 20,000 and 40,000 today). While conservation work to save the species is on-going in Africa, efforts have now moved to the US as well, where a coalition of conservation groups are filing a petition with the US Department of the Interior to list lions as 'endangered' under the Endangered Species Act (ESA). Such a listing would make it illegal to bring lion parts in the country, including those killed by recreational trophy hunters.