Ecological study of rotifers from Kor river, Fars, Iran

Area of Science:

• Environmental Science
• Aquatic Ecology
• Zooplankton Studies

Background:

• The Kor River ecosystem's health is influenced by seasonal variations in physico-chemical parameters.
• Understanding these parameters is crucial for assessing aquatic invertebrate populations, such as rotifers.

Purpose of the Study:

• To investigate the seasonal fluctuations of physico-chemical parameters in the Kor River.
• To determine the impact of these parameters on the population density of surface water rotifers.

Main Methods:

• Water samples were collected from three stations over one year.
• Physico-chemical parameters including temperature, dissolved oxygen, BOD, COD, total nitrogen, hardness, pH, alkalinity, acidity, TDS, and water current were measured.
• Rotifer species identification and population density counts were performed.

Main Results:

• Thirteen rotifer species were identified, with Lecane luna showing maximum population density.
• Lecane luna, Keratella valga, and Monostyla lunaris were identified as key species.
• A significant inverse relationship was found between rotifer density and water current.
• A direct relationship was observed between water temperature and rotifer density.

Conclusions:

• Water temperature and current are critical factors influencing rotifer population dynamics in the Kor River.
• The findings provide insights into the ecological requirements of rotifers in freshwater environments.
• This research contributes to the understanding of aquatic ecosystem health and biodiversity in the region.