Diversification of narrow-clawed crayfish (Pontastacus leptodactylus Eschscholtz, 1823) populations from different parts of Turkey

Authors : Yavuz MAZLUM, Mehmet Fatih CAN, Abdullah ÖKSÜZ

Pages : 1-9

View : 24 | Download : 8

Publication Date : 2019-12-31

Article Type : Research Paper

Abstract :The present study was to evaluate diversification of crayfish populations based on length and weight measurements. Crayfish were collected from natural stock with fyke-net at five different populations of Turkey in the lakes Iznik insert ignore into journalissuearticles values(IL);, Egirdir insert ignore into journalissuearticles values(EL); and Sera insert ignore into journalissuearticles values(SL); as well as Hirfanlı Dam Lake insert ignore into journalissuearticles values(HD); and Keban Dam Lake insert ignore into journalissuearticles values(KL); from June to July, 2008. The mean length, weight and hepatopancreas moisture content insert ignore into journalissuearticles values(HM, %); of the individuals sampled from different regions were found in order from largest to smallest as EL>HD>KL>IL>SL, EL>HD>KL>SL>IL and IL>KL>HD>KL>SL, respectively. In this study the median value of b coefficient, describing growth type from length-weight relationship, of five populations was 3.08, and fifty percent of the values were fell between 2.72 and 3.75. The growth types in these populations were determined as isometric, except in Keban Dam Lake insert ignore into journalissuearticles values(positive allometric);. DFA insert ignore into journalissuearticles values(Discriminant Function Analysis); showed that there were no significant differences among the populations, meanwhile 53.06 % dissimilarities between populations was driven by length and HP with the contribution of 60.18% and 39.82% insert ignore into journalissuearticles values(based on SIMPER analysis);, respectively. Although results from b coefficients, HM values and DF analysis of populations may reveal that their environmental conditions and growth types were similar in a certain extent, many more data taken from at least one-year sampling period is highly recommended for better understanding on factors that influenced the growth of its crayfish structure.
Keywords : diversification, length weight relationships, narrow clawed crayfish