Abstract
To understand the possible effects of changes in ambient temperature on spatial distribution and ecology of ostracods, samples were randomly collected from 70 aquatic sites with 12 different habitat types from Hatay (Turkey) province during the summer season of 2012. 14 of 19 ostracod species were newly reported for the province. The first two axes of CCA explained 79.7% of the cumulative variance of the relationship between the 12 most common species and five environmental variables. Accordingly, water temperature and electrical conductivity were the most effective factors on species occurrences (p<0.05). Estimating ecological optimum and tolerance values of species revealed that Herpetocypris chevreuxi and Cypridopsis vidua displayed the lowest and highest tolerance values for water temperature, respectively. TWINSPAN results illustrated that ostracod species can be used to determine characteristics of habitat conditions. Indeed, the co-occurrence of H. chevreuxi with one or more cosmopolitan species is the indication of an increase in salinity and temperature values. Results suggested that temperature changes can cause critical alteration in shallow water bodies where species with lower ecological tolerances will eventually be negatively affected. Therefore, such species, which may be called “potential candidate species for local extinction” will either be eliminated from the habitats in short term or become extinct in long term.
Highlights
Extinction is not one inevitable result that organisms must face
It is a fact that most species are under the threat of global and/or local extinction (Black et al 2001; Eisenhauer et al 2019) due to climatic and anthropogenic factors
Akdemir & Külköylüoğlu. 2021- LimnoFish 7(1): 1-13 changing in flow regime and chemical composition of freshwaters (Dudgeon et al 2006; Ertürk 2012; Leigh 2013). This situation leads to critical alteration in species composition in a habitat and/or geographic distribution of species (An et al 2013; Finlayson et al 2013)
Summary
It is a fact that most (if not all) species are under the threat of global and/or local extinction (Black et al 2001; Eisenhauer et al 2019) due to climatic and anthropogenic factors. 2021- LimnoFish 7(1): 1-13 changing in flow regime and chemical composition of freshwaters (Dudgeon et al 2006; Ertürk 2012; Leigh 2013). This situation leads to critical alteration in species composition in a habitat and/or geographic distribution of species (An et al 2013; Finlayson et al 2013). Because, when species are faced with changes, most (if not all) of them will not be able to develop fast responses enough to the new environmental conditions. While the species may have a chance to survive as they fit the new conditions by different adaptation abilities, the others, which have restricted ecological ranges, may either become more vulnerable or die out
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