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Titolo:
Spatial aspects of the reproductive and feeding biology of the striped robber, Brycinus laterolis (Pisces : Characidae), in the Okavango Delta, Botswana
Autore:
Booth, AJ; McKinlay, BW;
Indirizzi:
Rhodes Univ, Dept Ichthyol & Fishery Sci, ZA-6140 Grahamstown, South Africa Rhodes Univ Grahamstown South Africa ZA-6140 0 Grahamstown, South Africa
Titolo Testata:
AFRICAN ZOOLOGY
fascicolo: 1, volume: 36, anno: 2001,
pagine: 31 - 40
SICI:
1562-7020(200104)36:1<31:SAOTRA>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
FISHES;
Keywords:
reproductive seasonality; sexual maturity; diet; characin; ontological dietary shift; flood cycle;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Booth, AJ Rhodes Univ, Dept Ichthyol & Fishery Sci, POB 94, ZA-6140 Grahamstown, South Africa Rhodes Univ POB 94 Grahamstown South Africa ZA-6140 outh Africa
Citazione:
A.J. Booth e B.W. McKinlay, "Spatial aspects of the reproductive and feeding biology of the striped robber, Brycinus laterolis (Pisces : Characidae), in the Okavango Delta, Botswana", AFR ZOOL, 36(1), 2001, pp. 31-40

Abstract

The Okavango Delta is a vast inland wetland system situated in northern Botswana. High rainfall is received in early summer in the southern Angolan highlands and throughout the Delta with the flood waters reaching the upper riverine floodplain between March and May where it percolates through to the lower drainage rivers between July and September. Aspects of the reproductive and feeding biology of two allopatric populations of the striped robber, Brycinus lateralis, a small characin species inhabiting the northern riverine floodplain and southern drainage rivers, were investigated. Both populations were similar in the biological aspects studied, with the flood cycle having little influence on the timing of reproduction, sexual maturity and dietary composition. Female fish from both populations matured sexually at 57 mm SL, breeding over a protracted period during the warm, summer months. In both populations, the sex ratio was female-dominated at 4.8:1 (riverine floodplain) and 2.2:1 (drainage rivers). The striped robber is an opportunistic micro-carnivore with immature fish feeding predominantly on Daphniaspp. and adults being largely insectivorous.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 12:37:10