Yurtsever S.Sal G.2024-06-122024-06-1220031335-6380https://hdl.handle.net/20.500.14551/17603Populations of the polymorphic spittlebug, Philaenus spumarius in three different deciduous forests of the Istranca Mts in NW Turkey were studied. Results indicated that the index of diversity was significantly different between the mixed and oak forests. Although sample size varied greatly, it did not significantly affect the estimated diversity values. The combined non-melanic and melanic phenotype frequencies remained stable during the summer and autumn seasons. Abnormal sex ratios, (different from 1:1) with an excess of males were found in the majority of samples. The proportion of females reduced to 13% in the autumn. Thus in some samples, the number of males was 6.5 times more than of females. The significant sex ratio distortion was much more apparent in the beech forests, where 14 of the 15 samples included more males, accounting for the ratio of males frequently reaching over 65%.eninfo:eu-repo/semantics/closedAccessMelanism; Phenotypic Diversity; Philaenus Spumarius; Polymorphism; Sex Ratio; TurkeyAves; Cercopidae; Fagus; Hemiptera; Insecta; Meleagris Gallopavo; Philaenus Spumarius; QuercusArticle5859299342-s2.0-0345802780N/A