Patterns of fish species richness in rivers of the central region of Argentina

Autor:	BISTONI M. A., HUED A. C.
Jazyk:	angličtina
Rok vydání:	2002
Předmět:	fish species richness rivers altitude distance from source order Science Biology (General) QH301-705.5 Zoology QL1-991 Botany QK1-989
Zdroj:	Brazilian Journal of Biology, Vol 62, Iss 4b, Pp 753-764 (2002)
Druh dokumentu:	article
ISSN:	1519-6984 1678-4375
Popis:	We analyzed the variation of fish species richness and trophic structure along an upstream-downstream gradient and identified the factors associated with the pattern observed. The fish community composition varied along a headwater-downstream gradient. Species richness and trophic structure decreased significantly with increasing altitude and increased with stream order and distance from source. Headwater communities showed a simple structure. Oncorhynchus mykiss was the only fish captured or noticeably dominant at high altitudes. Thus, headwater can be classified as "trout zones". From these zones to downstream areas fish communities changed because of the addition of other fish species. This phenomenon probably occurs because of an increase in habitat diversity.
Databáze:	Directory of Open Access Journals
Externí odkaz:	https://doaj.org/article/595ad94bb577437798dfc8c68acd610f Zobrazit plný text záznamu View record in DOAJ