00381nas a2200109   4500008004100000245007600041210006900117300001200186490000700198100001800205856004800223       1971                        eng d00aSubstratum relationships of some tropical Pacific intertidal gastropods0 aSubstratum relationships of some tropical Pacific intertidal gas  a315-3200 v101 aVermeij, G.J.  uhttps://neritopsine.myspecies.info/node/41802325nas a2200169   4500008004100000245009800041210006900139260001300208300001200221490000700233520177900240100002202019700002102041700002502062700002002087856004802107       2008                        eng d00aContrasting demographic history and phylogeographical patterns in two Indo-Pacific gastropods0 aContrasting demographic history and phylogeographical patterns i  c2008 Jan  a611-6260 v173 aMarine species with ranges that span the Indo-Australian Archipelago (IAA) exhibit a range of phylogeographical patterns, most of which are interpreted in the context of vicariance between Indian and Pacific Ocean populations during Pliocene and Pleistocene low sea-level stands. However, patterns often vary among ecologically similar taxa, sometimes even within genera. This study compares phylogeographical patterns in two species of highly dispersive neritid gastropod, Nerita albicilla and Nerita plicata, with nearly sympatric ranges that span the Indo-Pacific. Mitochondrial COI sequences from >1000 individuals from 97 sites reveal similar phylogenies in both species (two divergent clades differing by 3.2% and 2.3%, for N. albicilla and N. plicata, respectively). However, despite ecological similarity and congeneric status, the two species exhibit phylogeographical discordance. N. albicilla has maintained reciprocal monophyly of Indian and Pacific Ocean populations, while N. plicata is panmictic between oceans, but displays a genetic cline in the Central Pacific. Although this difference might be explained by qualitatively different demographic histories, parameter estimates from three coalescent models indicate that both species have high levels of gene flow between demes (2Nem>75), and share a common history of population expansion that is likely associated with cyclical flooding of continental shelves and island lagoons following low sea-level stands. Results indicate that ecologically similar, codistributed species may respond very differently to shared environmental processes, suggesting that relatively minor differences in traits such as pelagic larval duration or microhabitat association may profoundly impact phylogeographical structure.1 aCrandall, Eric, D1 aFrey, Melissa, A1 aGrosberg, Richard, K1 aBarber, Paul, H  uhttps://neritopsine.myspecies.info/node/232