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An effective investigation of the underlying ecological processes that shape genetic diversity and connectivity typically requires comparisons among phylogeographic studies of multiple species. Phylogeographic studies of New Zealand’s coastal marine benthos have historically relied on post hoc speculation rather than directed research questions to investigate ecological processes. There has also been a lack of studies on direct developing marine molluscs. Direct developers are expected to have a low potential for dispersal and thus show a pattern of genetic isolation by distance across their distributions. Recent research indicates that this assumption may frequently be violated by instances of long distance dispersal/translocation. The oyster borer (Haustrum scobina) is an endemic direct-developing marine mollusc found in high abundances at rocky intertidal environments across the entirety of New Zealand. This distribution and life history makes H. scobina an ideal target to study genetic connectivity in a species expected to show low realised dispersal and high population genetic structuring. This thesis research used 379 new DNA sequences from the mitochondrial gene cytochrome c oxidase subunit 1 (COI) to investigate the phylogeography of H. scobina across the southern North Island. In addition 16 new COI sequences were inadvertently sequenced from the morphologically similar congener Haustrum albomarginatum. Results from both species support the recently proposed division of H. scobina and H. albomarginatum as separate species. H. scobina populations show significant geographic structure and a lack of haplotype diversity across the south-eastern North Island concordant with results of another previous study of a direct developer. This finding suggests that ecological processes may be producing similar population genetic structures for direct developers generally. Contrast between high and low haplotype diversities in northern and southern H. scobina populations respectively, indicates that southern H. scobina populations may have originated via recolonisation from northern populations following a range contraction during the Last Glacial Maximum. Evidence of multiple long distance dispersal/translocation events was found indicating that long distance dispersal via rafting and/or inadvertent human-mediated translocations may have occurred frequently. Results are then discussed with a view to inform further research in to New Zealand direct developers.

Phylogeography of the oyster borer (Haustrum scobina)