Browsing by Author "Atlihan R."
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Item The distribution and habitat of calomera littoralis mandli (mandl, 1967) (coleoptera: Cicindelidae) on the coastal margin of lake van in turkey(2006) Özgökçe M.S.; Atlihan R.; Kasap İ.; Özgökçe F.; Yıldız Ş.; Demir M.; Polat E.The tiger beetle Calomera littoralis mandli was found at Lake Van in eastern Anatolia at 20 out of 47 localities surveyed during 2004–2005. It occurs in open habitats with fine sand mixed with clay or in salt-marshes and with little plant cover. Three groups of larval burrows were determined, with average openings of 1.54 mm, 2.46 mm and 3.80 mm. These correspond to the 1st, 2nd and 3rd larval instars. © 2006 Taylor & Francis Group, LLC.Item Investigation of the effects of physico-chemical environmental conditions on population fluctuations of Notonecta viridis Delcourt, 1909 (Hemiptera: Notonectidae) in Van Lake by using Zero-inflated generalized Poisson regression; [Sifir deǧer aǧirlikli genelleştirilmiş Poisson regresyonu yardimiyla Van Gölü'nde Notonecta viridis Delcourt, 1909 (Hemiptera: Notonectidae)'in populasyon deǧişimi üzerinde fiziko-kimyasal çevresel koşullarin etkilerinin araştirilmasi](2011) Yeşilova A.; Özgökçe M.S.; Atlihan R.; Karaca I.; Özgökçe F.; Yildiz S.; Kaya Y.In ecological studies, it is a common situation occured that population density of species extremly increases or decreases in certain periods depending on many abiotic and biotic factors. Because of ecologial factors that cause high level fluctuation in population density, It is possible to get zero individual at samplings, and on the other hand, differences between maximum and minimum values obtained in different samplings intervals can be very high. Because this type of data based on counting does not show normal distribution, and shape of the distribution is skewed to the right because of the abundance of zero, using the Zero-inflated Poisson regression method (ZIGP) is required. This study was carried out to obtain information on effects of physico-chemical environmental conditions on population fluctuation of Notonecta viridis. Samplings were conducted with monthly periods along the coastal band of Van Lake in 2005-2006. Samples were taken from 20 sampling places where have three different characters as stream entrances, settlements and natural coastlines. Reults were analysed by using ZIGP regression model. According to results, Effect of sampling intervals and sampling stations on population densities of Notonecta viridis were important. On the other hand, HCO3 had negative effect on population densities in zero-inflated model while it had possitive effect on population densities in other two models. It was determined that Fe effected the species populations in the negative way in the mean regression model, and Cl and Mg effected it in possitive way in the overdispersion regression. In the result, it was deductived that Notonecta viridis was found excessive numbers or none in some sampling stations because of the pysico-chemical structures of water.