Volta

Inner‐Shelf Geomorphology and Hydrodynamics as Biogeographic Barriers to Long‐Distance Dispersal of the Interstitial Annelid Saccocirrus (Saccocirridae)

ABSTRACT Aim This study aimed to investigate the population structure and demographic history of Saccocirrus pussicus Marcus, 1948, an interstitial annelid that inhabits coarse sandy beaches in Brazil. We tested the hypothesis that the limited space between sediment grains constrains dispersal, resulting in restricted gene flow, despite the presence of a larval stage. We also tested whether oceanic conditions could influence connectivity and the distribution of genetic diversity. Location Samples were collected from coastal sites in Brazil, USA, Cuba, Panama and Italy. Taxon Saccocirrus pussicus Marcus, 1948 (Annelida, Saccocirridae). Methods We analysed fragments of the mitochondrial 16S rRNA and nuclear 28S rRNA genes from 190 Saccocirrus specimens to assess genetic diversity, lineage structure and connectivity patterns. Phylogenetic analyses, gene flow …

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