Assessment of some effective environmental variables on fish assemblage in Kordan River (Namak Basin)

With respect to the relative frequency of each species Capoeta buhsei, Noemacheilusbergianus and Paracobitis malapterura in 66 stations and assessment of 10environmental variables in each station of the Kordan River using the redundancyanalysis, it was found that how variables influence the distribution of each species.In terms of our results, depth, undercut banks, pools, boulders, overhangingvegetation, instream vegetation and overstream canopy closure class D had directrelationship with C. buhsei distribution. On N. bergianus distribution, width,discharge, velocity, pebble overstream canopy closure class B and grasslands ripariantype variables had a direct relationship. Slope, altitude, deciduous forest riparian type,woody debris, overstream canopy closure class C had a direct relationship with P.malapterura distribution. The most important factors with negative relationship withthe distribution of the species were as follows: altitude for N. bergianus, cobble forC. buhsei and overstream canopy closure class B for P. malapterura, respectively.

کلیدواژه ها:

Redundancy analysis ، Capoeta buhsei ، Noemacheilus bergianus ، Paracobitis malapterura