The African leopard and the Asian leopard may be different species

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2021-11-30 13:47:18

In the 1990s, molecular genetics researchers examined leopard mitochondrial genes from various places and divided leopards into 9 subspecies: 1 in Africa – African leopard and 8 other Asian subspecies – Persian leopard, Arabian leopard, Indian leopard, Ceylon leopard (Sri Lankan leopard), Javan leopard, Indochinese leopard, North Chinese leopard, Far Eastern leopard. Based on both molecular and fossil evidence, scholars believe that all nine leopard subspecies originated in Africa and then spread to Asia.

However, the mitochondrial gene can only represent maternal lineage, however the evidence representing paternal lineage is equally important, so it can be said that such a view is unreliable. trust completely. In 2021, some experts from the University of Potsdam in Germany sequenced the entire genome of leopards from 26 parts of the world and obtained more accurate results. This result has prompted the scientific community to re-examine the origin, evolution and taxonomy of leopards.

According to genome-wide sequencing results, modern leopards are clearly divided into two clades – African leopards and Asian leopards.

The divergence of these two clade ranges from 500,000 to 600,000 years – a bit long for a single species. Polar bears and brown bears have only been separated for about 400,000 years and are recognized as two separate species. Modern lions and maneless lions (cave lions) are separated by about 480,000 years. It can therefore be seen that the relationship between the Asian leopard and the African leopard is actually further than that between the modern lion and the maneless lion. Therefore, it is possible that the leopard species originally split into two species, the African leopard and the Asian leopard instead of the previous 9 subspecies.

New research: African leopards and Asian leopards may be different species - Photo 2.

From the results of genome sequencing, it is also shown that the genetic structure of the African leopard and the Asian leopard is completely different. The African leopard is characterized by high genetic diversity but low ability to differentiate. According to the test, the African leopard is the big cat with the highest genetic diversity, far surpassing the Asian leopard, lion, tiger, mountain lion, cheetah and lynx…

The Asian leopard is the opposite, its genetic makeup is characterized by low diversity but high differentiation, they have geographical isolation and clear genetic diversity between different groups. There are several reasons for this difference:

First, the Asian leopard is originally from Africa, descended from a small number of individuals that migrated from Africa, so its initial genetic diversity was relatively low.

Second, the environment of the African continent is similar, the leopard can easily adapt to a variety of habitats, from grasslands to tropical forests. Leopards across Africa are free to exchange genes, so they can always maintain a high level of genetic diversity, and also because of their similar habitats, their divergence also follows. that’s lower. In Asia, on the contrary, there are some geographical barriers between regions (for example, there is the Himalayas between East Asia and South Asia). The different groups will evolve separately, so the degree of differentiation is relatively high, and the genetic diversity within each group is relatively low.

New study: African leopards and Asian leopards may be different species - Photo 3.

Although the study suggested that leopards must have been split into two distinct clades, Africa and Asia, the study also found two other populations that were equally distinctive – the Anatolian leopard and the Persian leopard. Barbary Newspaper.

The Persian leopard lives in the north of Western Asia, and the average adult male weighs 67 kg and can grow up to 90 kg, making it the largest subspecies available. Genotyping of Persian leopards in two sites shows that although they are both Asian leopards, their genomes contain small amounts of African leopard genes. The Persian leopard in Palestine has 75% Asian leopard genes + 25% African leopard genes, the Afghan Persian leopard has 90% Asian leopard genes + 10% African leopard genes.

Scholars have found that although the African leopard and the Asian leopard have not had large-scale hybrids since they split between 500,000 and 600,000 years ago, small-scale entry has occurred in the last 100,000 years. Thus the Persian leopard genome contains a small amount of the African leopard gene.

The Barbary leopard lives in Northwestern Africa, north of the Sahara. Although the Barbary leopard’s genome is generally that of an African leopard, 14% of its genes indicate that it is closer to an Asian leopard and 7% of its genes are primitive genes, far from those of the common leopard. modern leopards. This result suggests that Asian leopards formerly migrated from Northwest Africa, and that Northwest Africa is likely the birthplace of modern leopards instead of East Africa as the fossil record indicates. out.

New study: African leopards and Asian leopards may be different species - Photo 4.

Barbary leopard specimen.

According to genome sequencing and previous studies, the origin and evolution of leopards has four important timelines:

Node 1: In Africa more than 2 million years ago, the leopard began to divergent and separate from its closest relative – the lion.

Node 2: Not earlier than 800,000 years ago, the common ancestor of the modern leopard appeared in East Africa or Northwest Africa, and then spread to all parts of Africa.

Node 3: 500,000 to 600,000 years ago, taking advantage of sea level declines during the ice age, a colony of African leopards (possibly from northwest Africa) entered Asia on the Asian land bridge – Africa, and spread to various parts of Asia.

Node 4: 50,000 to 70,000 years ago, when the last ice age arrived, along with the expansion of the Sahara Desert, the Barbary leopard gradually separated from other African leopards. At the same time, the Asia-Africa land bridge expanded again, and a small number of male African leopards (possibly Barbary leopards) entered Western Asia and crossed with local leopards.

New study: African leopards and Asian leopards may be different species - Photo 5.

Many people believe that the leopard’s ability to adapt and develop is better than that of other super-large cats such as lions and tigers, and this study has recreated the evolutionary process of leopards, giving us a better understanding. new on the reproductive ability of leopards.

In terms of ability to cross the forest, leopards are indeed superior to lions. Lions were unable to adapt to the tropical rainforests of Central and West Africa – this has always been the biggest barrier to lion migration, which has also led to the division of modern lions into two regional clades. northern and southern Africa. For leopards, the rainforest is not a problem at all.

New study: African leopards and Asian leopards may be different species - Photo 6.

But in terms of transcontinental migration, leopards are much worse off than lions. Both lions and leopards are native to Africa. Lions have left Africa on a large scale at least three times in evolutionary history:

The first was about 900,000 years ago, when the primordial lion came out of Africa and into Europe and Asia;

The second time was about 400,000 years ago, when the maneless lion came out of Africa, this time it not only took over Europe and Asia, but also entered the New World and eventually conquered nearly all of the continents. continents of the world.

The third time was about 30,000 years ago when the modern lion stepped out of Africa and into West and South Asia, laying the foundation for today’s Asian lion.

Leopards only exit Africa once on a large scale (the time period corresponding to a second migration for lions), and it is less efficient than lions – the furthest place leopards are located Their destination is North Asia, and they don’t get into North America.

New study: African leopards and Asian leopards may be different species - Photo 7.

This may be due to the leopard’s inability to adapt to grassland and space environments that look as strong as a lion’s. Both lions and leopards can adapt to grasslands, but lions can live in pure desert environments and leopards cannot.

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