BIOSYSTEMATICS AND DISTRIBUTION OF THE FRESHWATER FISHES OF PAKISTAN WITH SPECIAL REFERENCE TO THE SUBFAMILIES NOEMACHEILINAE AND SCHIZOTHORACINAE

Muhammad, Rafiq (2007) BIOSYSTEMATICS AND DISTRIBUTION OF THE FRESHWATER FISHES OF PAKISTAN WITH SPECIAL REFERENCE TO THE SUBFAMILIES NOEMACHEILINAE AND SCHIZOTHORACINAE. Doctoral thesis, University of Arid Agriculture Rawalpindi.

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Abstract

Sampling of 255 stations belonging to 44 reaches randomly distributed along the freshwater systems of Pakistan enlisted 190 fish species and of these 12 are additions to previously known ichthyo-diversity of the area. The area has a high proportion of endemics that comprised 43 species, (22.75 % of the total fish fauna). The taxonomic anomalies, especially with regard to sub-families Schizothoracinae and Noemacheilinae have been resolved based on cluster analysis of the morphometric characters using computer based Principal Component Analysis (PCA) and scatterplotting using the software MINITAB 14. The dendrogram, developed through degree of similarity between the compositions of the fish fauna at different reaches, was used to identify six ichthyo-ecological zones for the country. These zones are different in having different ecological conditions and also have geographic rationale. The relationship between the distributions of fish fauna determined by using CANOCO 4.5 computer software suggested that temperature, altitude, dissolved oxygen, turbidity, salinity and type of substratum are the main determinants of the species distribution of ichthyofauna of the area, while total dissolved solids (TDS), alkalinity, and conductivity have a relatively minor direct control. Exotic trout species do not appear to have immediate threat to the indigenous fish fauna while Tilapia species need special monitoring before it becomes a serious problem for local species.

Item Type: Thesis (Doctoral)
Uncontrolled Keywords: freshwater fishes, noemacheilinae, schizothoracinae, freshwater systems, endemics, ichthyofauna, total dissolved solids, trout, fish fauna, tilapia, inland waters, ichthyo-diversity
Subjects: Q Science > QL Zoology
Depositing User: Muhammad Khan Khan
Date Deposited: 01 Sep 2016 11:23
Last Modified: 01 Sep 2016 11:23
URI: http://eprints.hec.gov.pk/id/eprint/758

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