The Seasonal Distribution of Molluscan (Bivalvia and Gastropoda) Biodiversity in Riva Stream (Istanbul)

Year 2022, Volume: 37 Issue: 2, 69 - 73, 25.01.2022

Nilay Dökümcü , Serap Koşal Şahin

https://doi.org/10.26650/ASE2021962620

Abstract

Mollusk samples were collected between March 2018 and January 2019 through seasonal sampling at five stations [Riva (ST1), Kuzdere (ST2), Kanlıdere (ST3), Atdosun (ST4), Değirmendere (ST5)] of Riva Stream (Istanbul). In the study, 7,073 individuals, 7 taxa [1 species belonging to Prosobranchia (Bithynia sp.), 3 species belonging to Pulmonata (Planorbis planorbis (Linnaeus, 1758), Physella acuta (Draparnaud, 1805) and Gyraulus albus (O. F. Müller, 1774) and 3 species belonging to Bival-via [Pisidium casertanum (Poli 1791), Pisidiumamnicum (Muller, 1774) and Sphaerium corneum(Linnaeus, 1758)] were determined. Considering the dominance (%) of taxa, Bithynia sp. was deter-mined as the most dominant species among all stations (5,479 individuals (77.46%)). During sam-pling, various environmental variables [depth (cm), width (cm), flow rate (m/s), water temperature (oC), dissolved oxygen (%), pH, conductivity (μS/cm), salinity (ppm), NH4-N (mg/L), NO3-N (mg/L), NO2-N (mg/L), PO4-P (mg/L), TP (mg/L) and TSS (g/L)] were measured. The relationship between environmental variables and taxa was determined using Canonical Correspondence Analysis (CCA) using the Past Statistics Program, version 4.02. The clustering relationship between the five sam-pling stations and the unweighted pair group method (UPGMA) with arithmetic mean was shown.

Keywords

Gastropoda, Bivalvia, water quality, environmental variables, biodiversity

Supporting Institution

İstanbul Üniversitesi

Project Number

32254

Thanks

We would like to thank Graduate School of Science and Engineering; Unit of Scientific Research Projects and Inland Waters Department of Istanbul University (Project No.: 32254) for their valuable contributions.

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