Falkland Islands wolf

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The Falkland Islands wolf or warrah (Dusicyon australis) was the only native land mammal of the Falkland Islands.<ref>Template:Cite web</ref> This endemic canid became extinct in 1876.

It was once believed that the most closely related genus was Lycalopex, including the culpeo, a fox-like mammal which was introduced to the Falkland Islands in modern times. A 2009 cladistic analysis of DNA identified the Falkland Islands wolf's closest living relative as the maned wolf (Chrysocyon brachyurus), an unusually long-legged, fox-like South American canid, from which it separated about 6.7 million years ago.<ref name="Httpwwwsciencedailycomreleaseshtm">Template:Cite web</ref> However, the Falkland Islands wolf diverged from its mainland ancestor Dusicyon avus only around 16,000 years ago.<ref name=":0">Template:Cite journal</ref> Dusicyon avus persisted on the South American mainland until around 400 years ago.<ref>Template:Cite journal</ref>

The Falkland Islands wolf existed on both West and East Falkland. Charles Darwin was uncertain if they were differentiated varieties or subspecies.<ref name="Darwin1839">Template:Cite book</ref> Its fur had a tawny colour and the tip of the tail was white. Its diet is unknown, but without native rodents on the Falklands, the Falkland Islands wolf likely subsisted on seashore scavenging, ground-nesting birds, like geese and penguins, as well as seal pups and insects.<ref name="Allen1942">Template:Cite book</ref> It has been suggested they may have lived in burrows.<ref name="FalklandIslandsMuseumNationalTrust">Template:Cite web</ref>

Recent studies suggest it may have either naturally colonized the Falkland Islands or originate from domesticated Dusicyon avus brought to the islands by people before European settlers arrived.<ref>Template:Cite web</ref><ref>Template:Cite web</ref>

History

The first recorded sighting of a Falkland Islands wolf was by Captain John Strong in 1690.<ref name="Strong">Template:Cite web</ref> Captain Strong took one on his ship. However, during the voyage back to Europe, it became frightened by the firing of the ship's cannon and jumped overboard.<ref name="Strong"/><ref name="Purcell1999">Template:Cite book</ref> Louis Antoine de Bougainville, who established the first settlement in the Falkland Islands termed it a loup-renard<ref>Template:Cite EB1911</ref> ("wolf-fox").

When Charles Darwin visited the islands in 1833 he found the species present in both West and East Falkland and tame. However, at the time of his visit, the Falkland Islands wolf was already very rare on East Falkland, and its numbers were declining rapidly on West Falkland. By 1865, the Falkland Islands wolf was no longer found on the eastern part of East Falkland. Darwin predicted it would be extinct like the dodo within "a very few years."<ref>Template:Cite web</ref>

The Falkland Islands wolf was hunted for its valuable fur and settlers who regarded the wolf as a threat to their sheep poisoned it.<ref name="iucnredlist">Template:Cite web</ref> However, the belief that Falkland Islands wolf was a threat to sheep was probably due to the sheep mistaking the Falkland Islands wolves for dogs (especially at night), and, in terror, the sheep ran into bogs and swamps, where they became lost.<ref>Template:Cite web</ref> There were no forests for the animal to hide in, and it had no fear of humans;Template:Citation needed it was possible to lure the animal with a chunk of meat held in one hand, and kill it with a knife held in the other.<ref name=Darwin1839 /> However, it would defend itself occasionally if it needed to, as Admiral George Grey noted when they landed on West Falkland at Port Edgar on 17 December 1836:<ref>Template:Cite book</ref>

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A live wolf was taken to London Zoo, England in 1868.<ref name="WarrahLondon">Template:Cite web</ref> Another "Antarctic wolf" arrived in 1870. Neither animal survived long. Only a dozen or so museum specimens exist today.<ref name="Httpwwwsciencedailycomreleaseshtm" />

In 1880, after Falkland Islands wolf had become extinct, Thomas Huxley classified it as related to the coyote. In 1914, Oldfield Thomas moved it to the genus Dusicyon, with the culpeo and other South American foxes. (These other canids have since been removed to Lycalopex.)Template:Citation needed

Darwin's description

Darwin, on his 1834 visit to the Falklands in his Journal and Remarks (The Voyage of the Beagle), wrote that the Canis antarcticus:

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Biogeography and evolution

Darwin's comments

When organising his notes on the last stage of the Beagle expedition, Darwin wrote of his growing suspicions that the differences between the various Galápagos Islands mockingbirds and tortoises, as well as the possible dissimilarity of West Falkland and East Falkland Islands wolves, were but variants that differed depending on which island they came from: Template:Quotation The word "would" was added after this passage was first written, suggesting a cautious qualification from his initial bold statement.<ref name="Eldredge">Template:Cite journal</ref> He later wrote that such facts "seemed to me to throw some light on the origin of species".<ref name="Darwin1859">Template:Cite book</ref>

Related species

A DNA analysis<ref name="Slater" /> and a study of comparative brain anatomy<ref name="LyrasVan Der Geer2003">Template:Cite journal</ref> suggest that the closest living relative of the Falkland Islands wolf is the South American maned wolf.<ref name="Httpwwwsciencedailycomreleaseshtm"/> Their most recent common ancestor was estimated to have lived some 6 million years ago and was close to the most recent common ancestor of all South American canids, Eucyon or a close relative. It would seem that the lineages of the maned wolf and the Falkland Islands wolf separated in North America; canids did not appear in South America until roughly 3 million years ago in a paleozoogeographical event called the Great American Biotic Interchange, in which the continents of North and South America were newly connected by the formation of the Isthmus of Panama. However, no fossil from North America can be assigned to the Falkland Islands wolf or its immediate ancestors.<ref name="Httpwwwsciencedailycomreleaseshtm" />

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Dusicyon avus, known from fossils from southern South America as recent as 400 years ago, was the closest known relative of the Falkland Islands wolf.<ref name=":1">Template:Cite journal</ref>

In terms of skull shape and feeding habits, the animal was an opportunistic predator, more like a jackal.<ref>Template:Cite news</ref>

Biogeographical isolation on the Falklands

The route by which the Falkland Islands wolf was established in the islands was unknown for a long time, as the islands have never been connected to the mainland<ref name="Cione">Template:Cite journal see figure 3</ref> and there are no other native land mammals.<ref name="Mercopress">Template:Cite news</ref> No other oceanic island as remote as the Falklands has a native canid; the island fox of California in the US and Darwin's fox of Chile both inhabit islands much closer to a continent.Template:Citation needed

Berta and other authors suggest that it was unlikely that the wolf's ancestors could have survived the last Ice Age on the Falklands and they must therefore have arrived later, within the last ten thousand years, crossing a wide expanse of the South Atlantic.<ref>Template:Cite journal</ref> Its close relative, Dusicyon avus, did survive in South America until a few thousand years ago, but swimming such a distance or even drifting on a floating log would appear effectively impossible for the wolf. A study by a University of Maine team in 2021 reports evidence of potential visitation to the islands by indigenous South Americans before the Age of Discovery. The authors speculated that the ancestors of the wolf could have been domesticated and brought with the visitors.<ref name="Hamley_2021">Template:Cite journal</ref>

The oldest known remains of Falklands Islands wolves date to approximately 3396–3752 years Before Present, found at Spring Point Farm in West Falkland, the only place in the Falkland Islands where subfossil bones of the wolf have been found. The scarcity of remains is likely due to the acidic peaty soil of most of the Falklands, which rapidly degrades bones.<ref name="Hamley_2021" />

Genetics

DNA of the extinct mainland relative, D. avus, analyzed in 2013 suggests that its genetic history diverged from the Falkland Islands wolf only some 16,000 years ago, during the last glacial phase.<ref name=":0" /> This is strong evidence that the ancestors of the wolf were isolated on the islands only since the last glacial maximum. A 2009 analysis of mitochondrial DNA from five museum specimens of the Falkland Islands wolf indicated that they had multiple mitochondrial haplotypes whose most recent common ancestor lived about 330,000 years ago,<ref name="Slater">Template:Cite journal</ref> giving some idea of the genetic diversity of the founding population.

Ice Age land bridge

An Ice Age land bridge or ice connection between the Falkland Islands and South America, enabling the species' ancestors to traverse the gap, has long been suggested. There was never a true land bridge between the islands and South America, but submarine terraces have been found on the Argentine coastal shelf, formed by low sea-stands during the last glacial phase.<ref name=":0" /> This suggests that there was a shallow strait as narrow as 20 km, which may have frozen completely at times.<ref name=":0" /> It is possible that the founding population of the wolf crossed on this ice bridge during the last Ice Age.<ref name="Slater" /><ref name=":0" /> The absence of other mainland mammals on the islands might be due to the difficulty of an ice crossing.<ref name=":0" />

In culture

Locations that are named after the wolf:

Fox Bay, a bay and settlement on West Falkland
Warrah River, West Falkland

References

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Sources

External links

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Falkland Islands wolf

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