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- Journal of East African Natural History
- OA African Journal Archive
- Volume 1968, Issue 117, 1968
Journal of East African Natural History - Volume 1968, Issue 117, 1968
Volume 1968, Issue 117, 1968
Author G.F. LosseSource: Journal of East African Natural History 1968, pp 77 –115 (1968)More Less
Fishery statistics show that the herring-like fishes are among the most important in world fisheries of the present day (FAO, 1966). In East African waters, prior to the introduction of commercial pelagic fishing methods (EAMFRO, 1962; Losse, 1964, 1966), these fishes were exploited in very small quantities by a variety of indigenous fishing techniques, and virtually nothing was known of the species; their identity, biology or fishing potential. During preliminary biological and fishery investigations of fish caught by introduced purse-seine fisheries in the Zanzibar area of East Africa, it was found that accurate descriptionptions of species were required before these studies could be accomplished successfully. A large collection of clupeoid fish was therefore made during the routine investigations of the East African Marine Fisheries Research Organization (EAMFRO) from March 1963 to June 1966.
Notes on the birds observed in the vicinity of Tabora, Tanzania, with special reference to breeding dataAuthor J.F. ReynoldsSource: Journal of East African Natural History 1968, pp 117 –139 (1968)More Less
A defined status is allocated to 297 avian species recorded within a 20 mile radius of the town of Tabora in Tanzania. General descriptionptions are given of the areas in which the observations were made. Data on the breeding seasons (""corrected"" to months in which eggs have been found) and, in some cases, habits of 98 species are given. The extent to which the data conform with Moreau's generalisations is briefly discussed.
Author R.** Jabbal, I.* & HarmsenSource: Journal of East African Natural History 1968, pp 141 –154 (1968)More Less
In March 1966, a number of biologists of University College, Nairobi, under the leadership of Dr. Malcolm J. Coe, undertook a research expedition to the alpine zone of Mount Kenya. The main purpose of the expedition was to study the ecology of the relatively dry northern slopes of Mount Kenya which, from a biological standpoint, were virtually unknown. The Base Camp was erected at 12,500 ft. (3,800 m.) in the Kazita West Valley. Most work was carried out in the vicinity of the camp, but a number of collections were made up to the head of the valley (c. 14,000 ft. - 4,300m). The vegetation in this region is fairly typical of the lower alpine zone: consisting mainly of open tussock grassland and patches of Carex monostachya A. Rich. bog on drainage impeded soils. Collections were made in the following situations: 1. Festuca abyssinica St-Yves and F. pilgeri A. Rich. tussocks. 2. Lobelia keniensis R.E. Fr. & Th. Fr. jr. rosettes and inflorescences. 3. Open soil and rocky ground.
Source: Journal of East African Natural History 1968, pp 155 –156 (1968)More Less
Among the helminth parasites collected by the second author in Kenya from 1962 to 1965 were several species of nematodes, reported herein. Specimens were fixed in AFA and cleared in glycerin for study. Rare species are deposited in the USNM Helminthological Collection, Beltsville, Maryland. The results of this study are reported in Table 1.
Author I.** Harmsen, R.* & JabbalSource: Journal of East African Natural History 1968, pp 157 –161 (1968)More Less
During the years 1963-1966 a collection of fleas was made by various members of the Department of Zoology of University College, Nairobi (UCN). This collection was mainly based on Dr. J. B. Foster's trapping of small mammals, and on the fieldwork of Dr. J. B. Sale with hyrax. Some specimens, however, were collected occasionally from road kills and other incidental mammalian hosts. The collection culminated with the work of the University College Mount Kenya Expedition in March 1966. The collection was mounted and identified by members of the Division of Insect-Borne Diseases (DIBD), Medical Department, Kenya, and a number of specimens were sent to Mr. F. G. A. M. Smit, Zoological Museum, Tring, England, for confirmation of identification. The present records of distribution and host-specificity are of interest for a variety of reasons. Fleas only spend their adult life in intimate contact with the mammalian host, the larva is a free living insect, feeding on proteinaceous detritus. It is, therefore, to be expected that fleas will be mainly found on those mammals which have permanent dwelling sites, and particularly on nest or den building animals. This is the immediate effect of the need of a freshly emerged adult flea to contact a new host. Flea eggs deposited in a nest or den have a much higher chance of developing into adults within the immediate reach of a new host than flea eggs deposited at random in the field. One other consequence of this necessity of the flea to locate a host within its life time after larval development away from the host, is a dependence on the climate. It is, thus, to be expected that within the fairly narrow geographical confines of Kenya a number of flea species will be restricted to particular altitudinal levels in response to a climatic adaptation, even when suitable hosts are available at other altitudes. Alternatively, one would expect to find fleas restricted to particular hosts at one altitude, and to other hosts at another altitude, this in response to the combined effect of climate and nesting habits of different hosts. This form of ecologically based isolation could well become the basis of speciation.