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Title Correlation between shell body mass ratio and hydrostatic settling characteristics of mollusk species
Posted by Cesar Demayo
Authors Luo Du, Wang XUEJIE, Xu Memg, Gu Dang,”en, Mu Xidung, Yang Yexin, Cesar G. Demayo, Hu Yinchang
Publication date 2018
Journal Acta Ecologica Sinica
Volume 38
Issue 18
Pages 6778-6785
Publisher Elsevier
Abstract Shell phenotype is the result of adaptive evolution in molluscs. In order to explore the specificity of shell phenotype and its relationship with eco-hydrolics, this study examined the shell body mass ratio and the hydrostatic settling characteristics of nine mollusk species, as well as their interspecific differences and correlations. The results showed that body mass (C>V>=1.1) was the most significant morphological index, compare d to shell length (C>V>=0.54). The shell -body mass ratio differed significantly between species (P<0.01), however, with a small variation coefficient (C>V>=0.20). The average shell-body mass ratio 0.32+0.13, and was significantly smaller in terrestrial molluscs than in aquatic molluscs (P<0.01). The largest shell body mass ration was found in Corbicula luminea(0.54+0.06), which was more than three times that of the smallest species, Achatina fulica (0.17+0.04). The shell mass of Pomacea canaliculate was half of its body mass ().50+0.06). The settling behavior was significantly different between bivalves and snails. Cipangopaludina cathayensis, Bellmya aeruginosa, and C. fluminea were the only three species which could not float in still water, in the present study. The fastest settling velocity of C. fluminea (24.99+4.22) cm/s was nearly six times that of the slowest, Radix swinhoci ((4.13+0.96) cm/s). Settling velocity and settling acceleration did not differe significantly between the invasive snails A. fulica ((0.1830+3.64)cm/s) and P. canaliculate ((21.77+5.23) cm/s), and the native snails P. aeruginosa ((19.48+3.14) cm/s) and c. catahyensis ((21.44+3.92)cm/s). Shell body mass ratio was correlated with setlling velocity (R2=0.39) in adults. Following current research, the study of settling behavior changing with life history will further reveal the role of eco-hydraulics in evolution and population expansion in molluscs.
Index terms / Keywords golden apple snail, african snail, biological invasion, eco-hydraulics, population disperal
DOI 10.5846/stxb201803250589