Zooplankton population in the river tigris: Effects of samarra impoundment

Autor:	Anmar W. Sabri, Zainab H. Ali, Serwan F. Shawkat, Khalid A. Rasheed, Thaer I. Kassim, Lamia A. Thejar
Rok vydání:	1993
Předmět:	Hydrology education.field_of_study biology Discharge fungi Population Branchiopoda Seasonality medicine.disease biology.organism_classification Population density Crustacean Zooplankton humanities Cladocera medicine Environmental science education General Environmental Science
Zdroj:	Regulated Rivers: Research & Management. 8:237-250
ISSN:	1099-1646 0886-9375
DOI:	10.1002/rrr.3450080304
Popis:	The influences of the Samarra impoundment on the ecology of the downstream sector of the river Tigris are investigated. Zooplankton were collected monthly from July 1987 to July 1988. It was found that zooplankton were most abundant during high river discharges in March. During the month of low river discharge, September, the zooplankton population was greatly reduced immediately below the barrage and remained so to the last downstream station. Several factors seem to explain such differences. The high discharge from the impoundment was found to be the dominating factor and may flush the small backwaters in which zooplankton were abundant, thus increasing the population in the river. Zooplankton species vary in their ability to sustain populations in the river, variations which are due mainly to species-specific characteristics.
Databáze:	OpenAIRE
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