Size doesn’t matter: integrative taxonomy shows Crepidula adunca and Crepidula norrisiarum have overlapping shell size and broadly concordant distributions - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue The Biological Bulletin Année : 2022

Size doesn’t matter: integrative taxonomy shows Crepidula adunca and Crepidula norrisiarum have overlapping shell size and broadly concordant distributions

Résumé

The calyptraeids Crepidula adunca and Crepidula norrisiarum, both direct-developers, are abundant in the shallow waters of the northeastern Pacific. They have long been considered as two allopatric species that live on different hosts and differ in body size. In this study, we rigorously test this historical hypothesis by assessing molecular taxonomy, museum records, new morphological and host observations, and population genetic structure along the northeast Pacific coast. Results show that contrary to previous understanding, the distributions of the two species largely overlap, and that size does not effectively distinguish them, especially in the northern part of the range where the nominal “C. adunca” has been studied. Newly recognized northern occurrences of C. norrisiarum demonstrate that both species have similar, disrupted distributions that range from British Colombia through Southern California. Neither species is reported to occur on the outer shores of Southern Washington or Oregon, the exception being records of C. adunca at Cape Arago, Oregon. Despite this apparent geographic gap, neither species shows appreciable genetic differentiation between the northern and southern parts of their ranges. Despite that body size has been used to distinguish these species, our observations do not support body size as a species-specific trait; rather, they support a new hypothesis that body size variation reflects regional differences in host use and host availability.
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hal-03852592 , version 1 (15-11-2022)

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Magalie Castelin, Rachel Collin, Rick Harbo, Erica Spense, Kara Aschenbrenner, et al.. Size doesn’t matter: integrative taxonomy shows Crepidula adunca and Crepidula norrisiarum have overlapping shell size and broadly concordant distributions. The Biological Bulletin, 2022, ⟨10.1086/720422⟩. ⟨hal-03852592⟩
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