Ethiopian-Region

Zoogeographical Realms – Ethiopian Region

Ethiopian Region

In this article, we will discuss the zoogeographical realm – the Ethiopian region, its physical features, climatic conditions, and zoological characteristics.

Extent

Ethiopian region consists of the whole of Africa except for its northern part which is the part of the Palaearctic region, and the southern part of Arabia. Some authors include the large island of Madagascar and its surrounding neighboring islands in the Ethiopian region.

Geographically and geologically, Madagascar is very distinctive and has different zoological characteristics from the Ethiopian region. So, it is treated separately from Continental Island.

East African subregion

This region has high temperatures and desert conditions. This consists of Tropical Africa and Tropical Arabia and the Sahara Desert. It has common desert animals such as camel, ostrich, zebra, etc.

West African subregion

This region has thick forests, therefore, received heavy rainfall which nourishes flora. Good flora supports a variety of fauna which includes elephants, lions, gorillas, gibbons, etc. river Congo is also part of this region.

South African subregion

This region is also included in the Ethiopian region. It has some peculiar fauna which includes African lungfish, African mole, rats, etc.

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Malagasy subregion

The evolution of the Ethiopian region developed lemurs in Madagascar and thus separated it from the mainland. There is no connection and are many dissimilarities in the fauna of both regions. Now it is treated as another Continental region.

This subregion includes Madagascar and neighboring islands. There are no new animals. Here the fauna is represented by old animals. Some eutherians invaded this region. Lemurs and Chameleons are famous in this region.

Physical features and Climatic conditions

Almost all sides of this region are surrounded by the sea except for the northern side which is the Sahara Desert. The Sahara Desert is the largest desert in the world and acts as a barrier between Palaearctic and Ethiopian regions.

African is region is present in between tropics, here life conditions are much more uniform. This region contains thick, dense forests, high mountains, grassy plains, and big rivers. In January the whole region has a temperature of somewhat between 20 to 30 ᵒC with a still higher temperature in Central Africa.

Moisture conditions affect the distribution of plants and animals more than temperature. The great diversity of flora here supports a variety of endemic fauna.

Zoological Characteristics

Zoological Characteristics

The Ethiopian region has very rich fauna which also varies greatly and well-marked. This region contains as many as 161 families of terrestrial vertebrates out of which 12 families are exclusive to this region.

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Mammals:

There are 38 families of mammals out of which 12 are endemic to this region.  These endemic families include:

Hippopotamidae (hippopotamus), Chrysochloridae (golden mole), Orycteropidae (Aardvarks), Anamoluridae (flying squirrels), Giraffidae (giraffe), Pedetidae (spring Hares), Macroscelidae (elephant shrews), Potamagolidae (otter shrews), Petromuridae (rock rats), Thyronomydae (cane rats), Ctenodactylidae (Gundis), Bathyergidae (sand burrowing rodent).

The animals which it shares with the oriental region are monkeys, pangolins, lorises, Cheetahs, rhinoceroses, etc. This region also shares few animals with the Palaearctic region which are wild horses, jerboas, and dormice.

Aves:

Birds are very numerous. There are six families of birds that are endemic to this region. These are ostriches, secretary birds, helmet shrikes, mousebirds, hammerheads, and crested touracos.

The birds which it shares with the Oriental region are cuckoos, hornbills, woodpeckers, bee-eaters, kingfishers, orioles, owls, goatsuckers, storks, pigeons, etc.

Reptiles:

Here reptilian fauna is very rich. Out of 50 total species of Chameleons in the world, 46 are present in this region. Crocodiles, turtles, agamids, monitor lizards are also found in this region. Girdled lizards are exclusive to this region.

Amphibians:

Amphibians are less distinctive in this region. There are numerous toads and frogs but no urodeles are present. There are no tailed amphibians and tree frogs in this region. The only endemic family to this region is Dactylethridae represented by the genus Xenopus; the clawed toad.

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Fish:

The fish fauna of the Ethiopian region is diverse and consists of many primitive groups such as polypterus (Bichir), protopterus (lungfish), mormyrids, etc. There are two species of lungfish in the rivers and lakes of this region.

Ten species of Bichir are found here. Electric eels, carps, catfishes are also present.

Affinities to other regions

It ranks second after the Neotropical region in having a great number of unique families of fauna. Ethiopian region shares some families like jerboas, wild horses with the Palaearctic region. It shares eight mammalian families with the Oriental regions such as lorises and monkeys.

There are no common mammals which it shares with Neotropical and Nearctic regions. The Ethiopian region resembles both the Neotropical and Oriental regions in fish and reptilian fauna. So, it can be said that the Ethiopian region resembles mostly with Neotropical and Oriental regions.

It is because they all have tropic climatic conditions but their similarities are much stronger with the tropics of the Old-world than that of the New World.