B. Nievergelt's Ibexes in an African Environment: Ecology and Social System PDF

By B. Nievergelt

ISBN-10: 3642679587

ISBN-13: 9783642679582

ISBN-10: 3642679609

ISBN-13: 9783642679605

The Caprinae are attribute ungulates of palaearctic mountain areas. The Walia ibex, Capra ibex walie, a member of the Caprinae, has colonized effectively the Simen mountains in Ethiopia, and as such provides an engaging act within the background of the Caprinae. except the query of ways the Walia ibex or its ancestors ever reached the Simen mountains, the one position it happens, i want to emphasize an extra aspect: approximately 1/2 the present ungulate species on the earth are endemic to Africa. Eightyseven species of the Artiodactyla are stated to dwell during this continent, whereas there are just 17 in South the USA (Haltenorth 1963, Delany and Happold 1979). Such abundance of ungulate kinds should have been attended via optimum usage of a number of the habitats and shape co-adaptation of sympatric species (Lamprey 1963, Bell 1970, Gentry 1970). regardless of such extreme comĀ­ petition besides the fact that, the Walia ibex came across its usual area of interest nonetheless open. evidently, its diversifications to dwelling on steep cliffs have favoured its institution over the already current ungulate fauna in an afroalpine mountain sector. in truth, not one of the Cervids has accomplished an identical profitable colonisation at the African continent, even supposing they're much older as a bunch, and feature already proven themselves to be good validated at the American and Eurasian continents.

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Extra resources for Ibexes in an African Environment: Ecology and Social System of the Walia Ibex in the Simen Mountains, Ethiopia

Sample text

Bearded vulture, Lammergeier, Gypaetus barbatus (Fig. 21a); common, picks up bones and lets them drop and break on rocks. On one occasion, I observed a Bearded vulture picking up the same bone four times. 21. Birds of prey are omnipresent in the Simen mountains. a the Bearded vulture Gypaetus barbatus, almost a component of the Simen scenery; b the Egyptian vulture Neophron percnopterus, a regular visitor in human settlements; and c Riippell's Griffon vulture, Gyps ruppellii. The noticeable abundance of birds of prey, and vultures particularly, is apparently maintained at this high level by the numerous domestic animals 48 Further Mammals and Birds Living in the Simen Mountains b d f Fig.

The goats and ibexes evolved and are still distributed much more closely around the eastern Mediterranean, North Africa and the Middle The Reproductive Cycle of the Walia Ibex and the General Grouping Pattern 35 East, all of which are areas where ancestors may have occurred during the glaciation periods. Much of the evolutionary process involving the recent Capra members has obviously occurred in the upper Pleistocene. After the last Interglacial period (Eem) came the different phases of the last glaciation (Wiirm) beginning approximately 120,000 years BP when the situation was characterised by cold faunas.

The place where the animals had been seen was identified on aerial photographs, pinpointed, and then the serial number of the observation was written on the back. For areas east of the main study area Werdecker's map was also used (Werdecker 1967). The following environmental factors were recorded: date, time, cloud cover in tenths, wind velocity in five classes according to a simplified Beaufort-Scale (Nievergelt 1966a, p. 11) and direction, exposure towards the wind, whether it was sunny, shady or raining, type of vegetation (range 50 metres around animals), altitude (at place), compass direction which the slope faced (range 10 metres around animals), gradient of the slope (range 10 metres), and the topographical nature of the local area (range 10 metres).

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Ibexes in an African Environment: Ecology and Social System of the Walia Ibex in the Simen Mountains, Ethiopia by B. Nievergelt


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