Paper Information

Journal:   IRANIAN JOURNAL OF BIOLOGY   Fall 2003 , Volume 15 , Number 3; Page(s) 31 To 42.
 
Paper: 

DIVERSITY AND ABUNDANCE OF BENTHIC MACROINVERTEBRATES AND BIOLOGICAL INDICATORS OF ZAYANDEH-ROOD RIVER

 
 
Author(s):  EBRAHIMNEZHAD M.*
 
* Biology Department, Faculty of Sciences, university of Isfahan, Isfahan, Iran
 
Abstract: 
In order to study the diversity and abundance of macroinvertebrates and biological indicators of Zayandeh-rood River, nine sites along the river course in about 230 Km, from Cham-Hydar (below Zayandeh-rood Dam) to Varzaneh were selected. Three samples were taken from each site in four seasons, Autumn and Winter 1998, spring and Summer 1999 (108 samples in total). Sorting and counting of the samples were done in the laboratory and the macroinvertebrates of each sample were identified to the family level using microscope and identification keys. The diversity and abundance of the families of each site were compared and the indicator taxa were specified. BMWP biotic index was calculated for each sample and the statistical differences between sites and seasons were determined using ANOVA.
The results of 108 examined samples showed that some families such as; Baetidae and Heptagenidae (Ephemeroptera), Hydropsychidae and Philopotamidae (Trichoptera), and Gammaridae (Crustacea) were realized to be the indicators of upstream sites (1-5) containing relatively unpolluted water. These families were not present in downstream sites 96-9) nor were seen in high abundance. In contrast, the families of Chironomidae (Diptera), Physidae, hydrobiidae and Planorbidae (Gastropoda), and Oligochaeta were realized to be the indicators of downsteam site and they may be present in upstream sites in lower abundance. Furthermore, the calculation of BMWP score showed that the upstream sites in contrast to the downstream sites had higher scores and there were strong significant differences between sites in this regard (P<0.001). The results also confirmed the separation of upstream and downstream sites with regard to the biological indicators. Also, comparison of the pollution indicators of different sites revealed that the biological indicators may confirm the quality of the water of the sites examined.
 
Keyword(s): BENTHIC, MACROINVERTEBRATES, BIOLOGICAL INDICATORS, ZAYANDEH-ROOD RIVER, DIVERSITY AND ABUNDANCE, BMWP BIOTIC INDEX
 
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