摘要:

This is the first of a series of papers on the ecology of the Great Berg River in the Western Cape Province, South Africa. The topography and the flora are dealt with shortly and the physical and chemical conditions are described in some detail. The fauna is described broadly and related to the physical zonation of the river; the part played by the physical conditions in the zonation of the fauna is discussed and conditions are compared with those found in other parts of the world.

ISSN:0035-919X    

DOI:10.1080/00359195809520025

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

This part consists of three sections. The first deals with quantitative studies of the fauna of sandy bottoms sampled at two points on the river; a Birge-Ekman grab was used and samples were sifted through No. 3 grit gauze. The second section deals with the bottom fauna of three tributaries and discusses possible reasons for differences between these faunas and that of the main river. The third section comprises biological notes on most of the species encountered during the survey; these are arranged systematically.

ISSN:0035-919X    

DOI:10.1080/00359195809520026

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

In this paper eighty-three species of Chironomidae found along the Great Berg River (Western Cape Province, South Africa) are listed, and their distribution along the river given in tabular form. Fifty-two of these species were bred out in the laboratory from different habitats in the river. The distribution of the larvae is analysed, and the results compared with those obtained from samples collected and analysed by Harrison and Elsworth (1958, Part 1 of this series), and by Harrison (1958, Part 2 of this series), in their work on the same river.

ISSN:0035-919X    

DOI:10.1080/00359195809520027

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

The effects of mild organic pollution on the invertebrate fauna of the Great Berg River in the Paarl-Wellington region are described and also the conditions in a polluted tributary, the Dwars River. Serious organic pollution, largely from distillery wastes, was encountered in the Krom Stream, Stellenbosch; the drastic changes in the composition of the bottom fauna are described and related to changes in water quality. There is a discussion on the effects of different degrees of organic pollution on the faunal associations of various biotopes and reasons are advanced for the changes encountered, ‘indicator species’ are also discussed. Conditions found in South Africa so far are compared with those reported from other parts.

ISSN:0035-919X    

DOI:10.1080/00359195809520028

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor