Panthera spelaea explained

Panthera spelaea, commonly known as the cave lion (or less commonly as the steppe lion), is an extinct Panthera species that was native to Eurasia and northwest North America during the Pleistocene epoch. Genetic analysis of ancient DNA has revealed that while closely related, it was a distinct species genetically isolated from the modern lion (Panthera leo),[1] with the genetic divergence between the two species estimated at around 500,000 years ago.[2] The earliest fossils of the P. spelaea lineage (either regarded as the separate species Panthera fossilis or the subspecies P. spelaea fossilis) in Eurasia date to around 700,000 years ago (with possible late Early Pleistocene records).[3] It is closely related and probably ancestral to the American lion (Panthera atrox). The species ranged from Western Europe to eastern Beringia in North America, and was a prominent member of the mammoth steppe fauna, and an important apex predator across its range. It became extinct about 13,000 years ago.[4] It closely resembled living lions with a coat of yellowish-grey fur though unlike extant lions, males appear to have lacked manes.

Panthera spelaea interacted with both Neanderthals and modern humans, who used their pelts and in the case of the latter, depicted them in artistic works.

Taxonomy

Felis spelaea was the scientific name used by Georg August Goldfuss in 1810 for a fossil lion skull that was excavated in a cave in southern Germany.[5] It possibly dates to the Würm glaciation.[6]

Several authors regarded Panthera spelaea as a subspecies of the modern lion, and therefore as Panthera leo spelaea.[7] [8] [9] [1] One author considered the cave lion to be more closely related to the tiger based on a comparison of skull shapes, and proposed the scientific name Panthera tigris spelaea.[10]

Results from morphological studies showed that it is distinct in cranial and dental anatomy to justify the specific status of Panthera spelaea.[11] [12] Results of phylogenetic studies also support this assessment.[13] [14] [15]

In 2001, the subspecies Panthera spelaea vereshchagini was proposed for seven specimens found in Siberia and Yukon, which have smaller skulls and teeth than the average P. spelaea.[16] Before 2020, genetic analysis using ancient DNA provided no evidence for their distinct subspecific status; DNA signatures from P. spelaea from Europe and Alaska were indistinguishable, suggesting one large panmictic population.[14] [17] However, analysis of mitochondrial genome sequences from 31 cave lions showed that they fall into two monophyletic clades. One lived across western Europe and the other was restricted to Beringia during the Pleistocene. For this reason, the Beringian population is considered a distinct subspecies, P. s. vereshchagini.[18]

Evolution

Lion-like pantherine felids first appeared in the Tanzanian Olduvai Gorge about . These cats dispersed into Eurasia from East Africa around the end of the Early Pleistocene and the beginning of the Middle Pleistocene, giving rise to Panthera fossilis. The oldest widely accepted fossils of P. fossilis in Europe date to around 700,000 years ago,[19] [20] [21] with possible older fossils from Western Siberia dating to the late Early Pleistocene.[22] Different authors considered Panthera fossils as either a distinct species ancestral to P. spelaea,[23] or as a subspecies of P. spelaea.[24] Recent nuclear genomic evidence suggest that interbreeding between modern lions and all Eurasian fossil lions took place up until 500,000 years ago, but by 470,000 years ago, no subsequent interbreeding between the two lineages occurred.[19] [1] [2]

The following cladogram shows the genetic relationship between P. spelaea and other pantherine cats.Specimens intermediate between P. fossilis and Late Pleistocene P. spelaea are referred to as the subspecies P. s. intermedia. The transition from P. fossilis to Late Pleistocene P. spelaea involved significant changes in skull and tooth morphology.[25] Mitochondrial DNA sequence data from fossil lion remains show that the American lion represents a sister group of Late Pleistocene P. spelaea, and likely arose when an early P. spelaea population became isolated south of the Cordilleran Ice Sheet. Initially this was suggested to be around 340,000 years ago, but later studies suggested that the split between the two species was probably younger, around 165,000 years ago, consistent with the late first appearance of P. spelaea in Eastern Beringia (now Alaska and adjacent regions) during the Illinoian (around 190-130,000 years ago).[26]

Characteristics

Carvings and cave paintings of cave lions, which were discovered in the Lascaux and Chauvet Caves in France, were dated to 15,000 to 17,000 years old.[27] A drawing in the Chauvet cave depicts two cave lions walking together. The one in the foreground is slightly smaller than the one in the background, which has been drawn with a scrotum and without a mane.[28] Such cave paintings suggest that male cave lions completely lacked manes, or at most had very small manes.[4] Early members of the cave lion lineage (including those assigned Panthera fossilis) during the Middle Pleistocene were considerably larger than individuals of P. spelaea from the Last Glacial Period and modern lions, with some of these individuals having an estimated length of NaNm (-2,147,483,648feet), shoulder height of NaNm (-2,147,483,648feet) and body mass of, respectively, making them among the largest cats to have ever lived. The Late Pleistocene Panthera spelaea spelaea was noticeably smaller though still large relative to living cats, with an estimated length and shoulder height of NaNm (-2,147,483,648feet) and NaNm (-2,147,483,648feet), respectively, The species showed a progressive size reduction over the course of the Last Glacial Period up until its extinction, with the last P. spelaea populations comparable in size to small-sized modern lions, with a body mass of only and a body length and shoulder height of only NaNm (-2,147,483,648feet) and NaNcm (-2,147,483,648inches) respectively.[29]

P. spelaea had a relatively longer and narrower muzzle compared to that of the extant lion. Despite this, the two species do not exhibit major differences in morphology. Like modern lions, females were smaller than males.[30]

In 2016, hair found near the Maly Anyuy River was identified as cave lion hair through DNA analysis. Comparison with hair of a modern lion revealed that cave lion hair was probably similar in colour as that of the modern lion, though slightly lighter. In addition, the cave lion is thought to have had a very thick and dense undercoat comprising closed and compressed yellowish-to-white wavy downy hair with a smaller mass of darker-coloured guard hairs, possibly an adaptation to the Ice Age climate.[31] While juveniles fur coat colour was yellowish, adult cave lions are suggested to have had grey fur.

Distribution and habitat

During the Last Glacial Period, P. spelaea formed a contiguous population across the mammoth steppe, from Western Europe to northwest North America.[32] It was widely distributed in the Iberian Peninsula,[33] Italian Peninsula,[34] Southeast Europe,[35] Great Britain, Central Europe,[36] [37] [38] the East European Plain, the Ural Mountains,[39] most of Northeast Asia (ranging as far south as Northeast China[40] and possibly the Korean peninsula[41]), and across the Bering land bridge into Alaska and Yukon. The cave lion had a wide elevation range, with finds extending up over 2000m (7,000feet) above sea level in the European Alps and in Buryatia in Northern Asia, though they probably did not occupy mountainous habitats all-year round.[42] The cave lion probably inhabited predominantly open habitats such as steppe and grasslands although it would have also have occurred in open woodlands as well. It may have sought out hibernating bears in montane caves as a food source during the winter.[43] While during the Last Glacial Period it was often associated with cold environments, the species also inhabited temperate environments,[44] such as in Europe during the Last Interglacial/Eemian.[45]

Paleobiology

Ecology

P. spelaea was one of the keystone species of the mammoth steppe, being one of the main apex predators alongside the gray wolf, cave hyena and brown bear.[46] Large amounts of bones belonging to P. spelaea were excavated in caves, where bones of cave hyena, cave bear and Paleolithic artefacts were also found.[47] [48] Despite their common name, "cave lions" probably only infrequently if ever used caves, and were present in regions where caves were absent.[49] Some of these accumulations of cave lion bones in cave hyena dens have been attributed to confrontations between cave hyenas and cave lions over carcasses, with the remains of cave lions killed in these confrontations subsequently transported to the dens.[50]

Isotopic analyses of bone collagen samples extracted from remains in Europe and East Beringia[51] indicate that reindeer were particularly prominent in the diet of cave lions in these regions during the Last Glacial Period. Cave lions also seem to have opportunistically preyed on the cubs of cave bears.[52] Isotopic analysis of other European specimens suggests a diet including wild horse, woolly mammoth and cave bears for these individuals.

Other possible prey species were giant deer, red deer, muskox, aurochs, wisent, steppe bison, and young woolly rhinoceros. It likely competed for prey with the European leopards, cave hyenas, brown bears and grey wolves in Eurasia,[53] along with short-faced bears, Homotherium, and Beringian wolves in Beringia.

Social behavior

Whether or not cave lions existed in prides like modern lions is unclear. Isotopic analysis done by Hervé Bocherns in 2015, suggested cave lions in Europe may have been solitary, due to scattering of individual data which was more similar to individualistic behavior compared to modern day lion populations. Some other authors have also argued that the absence of manes in cave lions suggests that cave lions did not live in prides, given the importance of manes in the social hierarchy of modern lions. Boeskorov et al. 2021 suggested both European and Beringian cave lions may have hunted in larger prides than modern lions because sexual dimorphism in cave lions was more pronounced than in modern African lions and solitary big cats. However, they admitted the data is insufficient to come down to a certain conclusion.

Cave lion cubs appear to have lived in dens during their earliest stages of life, like modern lion cubs and were likely solely raised by females, like living Panthera species.

Relationship with humans

Cave lions were hunted and their pelts exploited in Europe by Neanderthals during the Middle Paleolithic,[54] and during the Upper Paleolithic by modern humans in Spain as evidenced in the La Garma site dating to the Magdalenian.[55] Modern humans also drew cave paintings of cave lions, engraved their likeness on bones and created sculptures of them, including the famous anthropomorphic lion-man figure from Hohlenstein-Stadel cave in Germany dating to around 41-35,000 years ago with the body of a human and the head of a lion. Cave lion canines with perforated holes may have been worn as personal ornaments.[54] Decorated stones with engravings representing cave lions have been found in southern Italy.[56]

Extinction

See also: Late Pleistocene extinctions. Radiocarbon dating suggests that the species went extinct approximately simultaneously across its range during the last few thousand years of the Late Pleistocene, around 14-15,000 years ago, possibly surviving around 1000 years later in the far east North American portion of its range. This timing roughly corresponds to the onset of the Bølling–Allerød Interstadial warm period and the consequent collapse of the mammoth steppe ecosystem. The precise cause of its extinction is unclear, but possibly involved environmental change from open habitats to closed forests, changes in prey abundance, as well as human impact, though it is difficult to distentangle the precise causes of its extinction. Cave lions appear to have undergone a population bottleneck that considerably reduced their genetic diversity between 47,000 and 18,000 years ago, probably driven at least in part by climatic instability.[57]

Mummified specimens

In 2008, a well-preserved mature cave lion specimen was unearthed near the Maly Anyuy River in Chukotka Autonomous Okrug, which still retained some clumps of hair.[58] In 2015, two frozen cave lion cubs, estimated to be between 25,000 and 55,000 years old, were discovered close to the Uyandina River in Yakutia, Siberia in permafrost.[59] [60] [61] Research results indicate that the cubs were likely barely a week old at the time of their deaths, as their milk teeth had not fully erupted. Further evidence suggests the cubs were hidden at a den site until they were strong enough to follow their mother back to the pride, as with modern lions. Researchers believe that the cubs were trapped and killed by a landslide, and that the absence of oxygen underground hindered their decomposition and allowed the cubs to be preserved in such good condition. A second expedition to the site where the cubs were found was planned for 2016, in hopes of finding either the remains of a third cub or possibly the cubs' mother.[62]

In 2017, another frozen specimen, thought to be a lion cub, was found in Yakutia on the banks of the Tirekhtyakh River (ru|Тирехтях), a tributary of the Indigirka River. This male cub was thought to be slightly older than the 2015 cubs at the time of its death; it is estimated to have been around one and a half to two months.[63] In 2018, another preserved carcass of a cub was found in a location away. It was considered to be around a month old when it died approximately 50,000 years ago, and presumed to be a sibling of the male cub.[64] However, carbon dating showed them to have lived about 15,000 years apart, with the female estimated to have lived 28,000 years ago, and the male 43,448 years ago. Both cubs were well preserved, albeit with a few damages, with the female possibly being the "best preserved" animal discovered from the Ice age.[65]

See also

External links

Notes and References

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