Species diversity of the Okavango Delta, Botswana.
Aquat. Sci. 68 (2006) 310–337. ISSN 1015-1621/06/030310-28. DOI 10.1007/s00027-006-0857-y © Eawag, Dübendorf, 2006
In the Okavango Delta (about 28,000km2) the number of identified species is 1,300 for plants, 71 for fish, 33 for amphibians, 64 for reptiles, 444 for birds, and 122 for mammals. The local occurrence of different species of these taxonomic groups in the Okavango Delta is mainly due to a hydrological gradient from permanent streams and swamps to seasonal floodplains, riparian woodlands, and dry woodlands. This level of species diversity is normal for the southern African region, and all analyzed aquatic groups are composed of ubiquitous species with an additional significant proportion of species originating from northern, more tropical systems. Cyclical variations in climate over thousands of years have created a huge wetland complex in the upper Zambezi and Okavango Rivers during wet phases. This wetland complex has fragmented into the Okavango Delta and other large wetlands in Zambia during dry phases. There are no endemic species in the Okavango Delta while the South-central African wetland complex is a centre of endemism. Species diversity of the Okavango Delta is a consequence of this unique environment, with dynamic shifts in flooding patterns that in turn force constant changes in patterns of plant succession and dependent animals. Temporal variations in flooding also cause accumulation and sudden mobilization of nutrients which are readily used by well adapted plant species. As a consequence, locally high biological productivity occurs, which in turn results in high numbers of grazing mammals.
Species diversity of the Okavango Delta, Botswana (PDF Download Available). Available from: https://www.researchgate.net/publication/226358917_Species_diversity_of_the_Okavango_Delta_Botswana [accessed Nov 14 2017].
Die letzten ihrer Art - Grevyzebras in Nordkenia und Äthiopien.
Z. Kölner Zoo 49, Heft 3: 111-123.
Conservation of Termit and Tin Toumma (Niger).
Annual report for 2007 of the Sahara Conservation Fund.
Sahara Conservation Fund, 30 pp.
Antelopes - Global Survey and Regional Action Plans, Part 4: North Africa, the Middle East and Asia.
260 Seiten. Verbreitungskarten.
IUCN, Gland. ISBN 2-8317-0594-0.
The IUCN/SSC Antelope Specialist Group was created in 1978 and currently has more than 100 members based in over 40 countries .A key objective of the group is to monitor the conservation status of all antelope species .The publication of Part 4 of Antelopes: Global Survey and Regional
Action Plans is an important and eagerly awaited milestone in achieving this objective .Following on from Parts 1 to 3, which dealt with the antelopes of sub-Saharan Africa, Part 4 completes the Antelope Specialist Group’s efforts to summarise current knowledge of the status of each antelope
species in all of its range states, and to develop Regional Action Plans for antelope conservation.
The completion of Part 4 is a tribute to the unstinting efforts and persistence of the compilers. They have produced a comprehensive work, which is a major addition to our knowledge of antelopes and will be of lasting value to antelope conservation .As the compiler of Parts 1 to 3 of
Antelopes: Global Survey and Regional Action Plans, I am uniquely placed to understand the magnitude of the compilers’ task. This is exacerbated by the relatively large number of species and range states that are covered by the Antelope Specialist Group. I warmly congratulate David Mallon and Steven Kingswood on their successful completion of this mammoth undertaking.
With almost 100 species globally, antelopes achieve an exceptionally high diversity compared to most other groups of medium to large-sized mammals . The living antelope species represent the continuation of a major and relatively recent evolutionary heritage and are among the most successful groups of large herbivores that have ever existed on Earth .They are also important flagship species for the conservation of natural environments .Flourishing antelope populations are key indicators of healthy grasslands, woodlands, forests, and deserts in many parts of Africa, the Middle East, and Asia. Hence, the conservation of antelopes is a vital component of biodiversity conservation throughout these regions .In addition, the beauty and grace of antelopes give them high aesthetic value. They are also an important natural resource in economic terms, through consumptive uses such as hunting for trophies, meat, and skins, and non-consumptive uses such as game-viewing tourism.
Threats to the survival of antelopes arise fundamentally from the growth of human and domestic livestock populations, which result in increasing degradation and destruction of natural habitats and excessive offtake by hunting for meat and skins. Unfortunately, these processes are even more advanced in much of the region covered by Part 4 of Antelopes: Global Survey and Regional Action Plans than in sub-Saharan Africa. Consequently, antelope populations have been severely depleted or exterminated over large parts of North Africa, the Middle East, and Asia .Nevertheless, viable and sometimes substantial remnants of most of the region’s antelope species survive.
Emphasis must now shift to the implementation of the conservation priorities identified in the Regional Action Plan, within the context of sustainable development and the conservation of biological diversity .Co-ordinated efforts by government and non-government agencies and conservation organisations will be essential to implement the protection and management regimes which are required to assure the long-term survival of representative examples of this spectacular group of mammals and their natural habitats.
Co-Chair, Antelope Specialist Group
The Wildlife Parks of Africa.
240 Seiten, teils farbig illustriert
Michael Joseph, London. ISBN 0 7181 2466 5
- Teil I: Conserving the wilderness
- Teil II: The National Parks
- West Africa
- East Africa
- Southern Africa
Der Ruf des Kongopfaus.
Charles und Emy Cordier – den Tieren auf der Spur.
266 Seiten, geb., 56 Abb., davon 6 Farbabbildungen.
Filander Verlag, Erlangen. iSBN 978-3-930831-71-5.
Eine spektakuläre, spannende Lebensgeschichte aus einer Zeit, als Tierfänger noch Helden waren. Den Schweizer Charles Cordier (1897–1994) zieht es schon früh in die weite Welt. Er spürt mit seiner Frau Emy (1903–1990) geheimnisvollen Tieren nach, streift durch von Feuchtigkeit dampfende Regenwälder und steht mit großen Zoologischen Gärten und Tierhaltern der Welt in regem Kontakt. Doch Schwierigkeiten schleichen sich in das Leben der beiden und Gefahren drohen. Langsam werden die Cordiers älter. Wie geht es weiter mit zwei Leben, die beide Weltkriege, den Kolonialismus und deren Ablösung erlebten? Charles und Emy Cordier mit seltenen Vögeln, Säugetieren und Reptilien in aller Welt. Eine narrativ verfasste Biographie.
In jeweils eigenen Kapiteln des Anhangs befasst sich der Autor auch mit der Problematik der Wildfänge und mit dem Thema Schweizer in der Zoogeschichte.
Hippopotamyrus ansorgii species complex in the Upper Zambezi River System with a description of a new species, H. szaboi (Mormyridae).
Zoologica Scripta, 33, 1–18.
Specimens referable to Hippopotamyrus ansorgii sampled from the Upper Zambezi River System within Caprivi (Namibia) represent a complex of three species, two of which coexist in the Upper Zambezi River, and a third that inhabits a nearby river, the Kwando, with which the Zambezi has been connected during periods of flooding. All three are indistinguishable in terms of their general appearance, but differ consistently in electric organ discharges (EOD), morphology, and molecular genetic characters. All phenotypes display a monopolar, head-positive EOD pulse with specific post- or prepotentials. For H. ansorgii from the Zambezi River (HaZ), pulse duration is less than 0.5 ms (down to 0.205 ms; N= 34); for the syntopic H. szaboi sp. n., it is greater than 0.6 ms (up to 1.8 ms at 10% peak amplitude; N= 19). The parapatric phenotype of H. ansorgii from the Kwando River (HaK) has pulses shorter than 0.215 ms (down to 0.105 ms; N = 36). All three members of the species complex may be distinguished from each other by 7−9 anatomical characters, analysed by manova. Based on 22 enzymes and proteins studied, the moderate to high Wright's fixation index and the significant (P < 0.05) allele differentiation between EOD phenotypes provide additional evidence for incipient speciation. Pairwise analyses of the three different phenotypes showed the two parapatric species of H. ansorgii grouped together, and distinguishable from individuals of H. szaboi. Analyses of the mitochondrial cytochrome b gene revealed that all specimens which were attributed to H. szaboi form a well-supported monophyletic basal clade (bootstrap support 73% or 82%). The genetic distances (uncorrected p distances) between H. szaboi and the two species of H. ansorgii are between 0.6% and 1.7%. Within the derived H. ansorgii clade some phylogeographical differentiation can be seen for fishes from the Zambezi and Kwando Rivers, but the respective groups are not consistent or supported by significant bootstrap values. The question of which of the two parapatric morphological and EOD phenotypes of H. ansorgii recognized in the present paper represents H. ansorgii (Boulenger, 1905) cannot be resolved at present because of the paucity and unclear origin of the historical type material.
KAMDEM-TOHAM, A., D’AMICO, J., OLSON, D., BLOM, A., TROWBRIDGE, L., BURGESS, N., THIEME, ., ABELL, R., CARROLL, R. W., GARTLAN, S., LANGRAND, O., MIKALA MUSSAVU, R-, O’HARA, D. & STRAND, H.
A Vision for Biodiversity Conservation in Central Africa: Biological Priorities for Conservation in the Guinean-Congolian Forest and Freshwater Region.
111 Seiten. World Wildlife Fund, Inc., Washington, DC.
Lion status updates from five range countries in West and Central Africa.
Cat News Nr. 52: 34-39. ISSN 1027-2992.
The lion Panthera leo is listed as Vulnerable on the IUCN Red List of Threatened Species and the species’ current status raises increasing concern among lion specialists across its African range. The situation is particularly alarming in West and Central Africa, where as few as 1000-2850 lions might remain, and where it is considered regionally Endangered in West Africa. Here we present results from lion surveys conducted in 2006-2010, covering 12 Lion Conservation Units (LCUs) in West Africa and three LCUs in Central Africa. We were able to confirm lion presence in only two of the LCUs surveyed in West Africa, and in none of the LCUs surveyed in Central Africa. Our results raise the possibility that no resident lion populations exist in Congo, Côte d’Ivoire and Ghana.