Effects of limnoecological changes on the Ostracoda (Crustacea) community in a shallow lake (Lake Çubuk, Turkey)
Articles > Article · 2014
Authors: Okan Kulkoyluoglu, Necmettin Sari, Muzaffer Dugel, Sukran Dere, Nurhayat Dalkiran, Cem AYGEN, Sirma Capar Dincer
Limnologica, Journal Indexed in SCI Expanded, International, WoS, 2014, vol 46, pp 99-108
DOI: 10.1016/j.limno.2014.01.001
Summary
<p>tWe sampled Lake C¸ ubuk, a shallow lake in Bolu (Turkey), for 26 months to investigate the effect of lim-noecological changes on the composition of ostracod species. Seventeen ostracod species were identifiedfrom the six stations sampled between 2008 and 2010. Numbers of species and individuals were both sig-nificantly reduced during 2010, which corresponded to a 3 m water level increase. Ostracod Watch Model(OWM) displayed distinct seasonal occurrences of five species (Candona neglecta, Cypria ophtalmica, Cypri-dopsis vidua, Limnocythere inopinata, Fabaeformiscandona cf. japonica) when Physocypria kraepelini wasthe only species encountered all year round. Approximately 77.2% of the relationship between species andenvironmental variables was expressed by the first two axes of Canonical Correspondence Analysis (CCA).Electrical conductivity and water temperature (P = 0.002) were the most influential variables on species.There was a significant negative correlation of seven species to conductivity. Of those (F. cf. japonica andC. vidua) showed a significant positive correlation to water temperature, while C. candida was negativelycorrelated to water temperature (P < 0.05). C. neglecta was the only species to show a positive correlationto dissolved oxygen. Tolerance limits for the most common species were higher than the mean watertemperatures, but lower than mean levels of electrical conductivity. Finding the ratio of noncosmopolitanto cosmopolitan species “pseudorichness” as 1.13 suggested significant role of cosmopolitan species tospecies diversity.</p>