Genetic connectivity among populations of two congeneric direct-developing whelks varies across spatial scales

Fleming, Angela M.; Dohner, Melanie; Phillips, Nicole E.; Ritchie, Peter A.

doi:10.1080/00288330.2017.1340899

Cited by 16 publications

(41 citation statements)

References 51 publications

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“…This estimate assumes a 2% divergence rate for the COI gene, which while an estimate, nonetheless suggests a recent expansion that could reasonably have followed the cyclic climatic oscillations defined by the late Pleistocene era (~110–15 kya) [ 82 ]. Glaciation has been suggested as the possible cause of demographic changes in other NZ marine organisms, including triplefin species [ 83 ], whelk species Cominella virgata and C. maculosa [ 84 ] and red alga Bostrychia intricata [ 85 ].…”

Section: Discussionmentioning

confidence: 99%

Genetic structure of the grey side-gilled sea slug (Pleurobranchaea maculata) in coastal waters of New Zealand

et al. 2018

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Pleurobranchaea maculata is a rarely studied species of the Heterobranchia found throughout the south and western Pacific–and recently recorded in Argentina–whose population genetic structure is unknown. Interest in the species was sparked in New Zealand following a series of dog deaths caused by ingestions of slugs containing high levels of the neurotoxin tetrodotoxin. Here we describe the genetic structure and demographic history of P. maculata populations from five principle locations in New Zealand based on extensive analyses of 12 microsatellite loci and the COI and CytB regions of mitochondrial DNA (mtDNA). Microsatellite data showed significant differentiation between northern and southern populations with population structure being associated with previously described regional variations in tetrodotoxin concentrations. However, mtDNA sequence data did not support such structure, revealing a star-shaped haplotype network with estimates of expansion time suggesting a population expansion in the Pleistocene era. Inclusion of publicly available mtDNA sequence sea slugs from Argentina did not alter the star-shaped network. We interpret our data as indicative of a single founding population that fragmented following geographical changes that brought about the present day north-south divide in New Zealand waters. Lack of evidence of cryptic species supports data indicating that differences in toxicity of individuals among regions are a consequence of differences in diet.

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Section: Discussionmentioning

confidence: 99%

Genetic structure of the grey side-gilled sea slug (Pleurobranchaea maculata) in coastal waters of New Zealand

et al. 2018

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“…To date in New Zealand, direct developers have shown evidence of leapfrog type dispersal, where they are most closely related to subpopulations not directly adjacent to them (Dohner et al 2018), long distance translocation (Fleming et al 2017) and post-glacial maxima re-colonisation of southern regions (Fleming et al 2017;Dohner et al 2018;Walton et al 2018). Many of these studies only provide a preliminary indication of these processes, with nearly all of them stating further research is required.…”

Section: Marine Life-history Strategies and Dispersalmentioning

confidence: 99%

“…The intention was to test for genetic connectivity between populations around New Zealand and use the findings to identify common causes of genetic patterns between Haustrum scobina sensu lato and ecologically similar species, which have previously been studied on a population level (such as Cominella maculosa and Cominella virgata). Studies of the Cominella genus have proposed hypotheses of gene flow mechanisms including sporadic long-distance dispersal events (Fleming et al 2017;Dohner et al 2018), human-mediated translocations (Fleming et al 2017;Walton et al 2018) and postglacial maxima colonisation of southern sites (Fleming et al 2017;Walton et al 2018). Specific hypotheses and research questions are listed in Chapter 2.…”

Section: Study Aimsmentioning

confidence: 99%

“…Since Ross et al (2009) published their review of the field, New Zealand researchers have continued to expand the work. Notable recent publications that have focused on phylogeography of direct developing benthos in particular include Walton et al (2018), Dohner et al (2018), Fleming et al (2017) and Keeney et al (2013). These studies have focused on Cominella maculosa, Cominella virgata, Zeacumantus subcarinatus and Zeacumantus lutulentus, which are all direct developing gastropods.…”

Section: Introductionmentioning

confidence: 99%

“…Studying direct developers is therefore more likely to be informative about environmental processes effecting a species' distribution and evolution than studying species with a longer PLD. A common pattern seen in New Zealand direct developers is a lack diversity in southern populations (Fleming et al 2017;Walton et al 2018). This is often attributed to recent post-glacial re-colonisation of southern sites (Fleming et al 2017;Dohner et al 2018;Walton et al 2018).…”

Section: Introductionmentioning

confidence: 99%

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A Nation-wide Phylogenetic and Phylogeographic Investigation of the Endemic New Zealand Oyster Borers, Haustrum scobina and Haustrum albomarginatum

O’Mahony¹

2021

Preprint

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The endemic New Zealand sea snails Haustrum scobina and Haustrum albomarginatum are rocky shore intertidal dogwhelks of the Muricidae family. They have direct developing young and are carnivores. Their radula is used to drill into the shells of their prey, and they are commonly referred to as oyster borers. The taxonomic status of these species is still unresolved and therefore the name Haustrum scobina sensu lato is used. The overall goal of this thesis research was to investigate the phylogeny and phylogeography of Haustrum scobina sensu lato using mitochondrial DNA sequences. Comparisons made to phylogeographic studies of ecologically similar species such as Cominella spp. provide an opportunity to identify the common environmental determinates of population migration route, genetic differentiation and speciation whenever similar patterns are found. A nation-wide collection of samples was used to generate 277 new sequences from a 610 bp portion of the cytochrome c oxidase subunit I (COI) gene. This enabled the formation of a dataset of 654 DNA sequences, which was comprised of the 277 new sequences, 16 retrieved from a published study that deposited them in GenBank, and 361 from a previous unpublished thesis study. An unexpectedly diverse phylogeny of 58 COI haplotypes from 31 sample sites was recovered. These formed three clusters using K-means clustering by pairwise mutational distance. The in-group species did not form reciprocal monophyly groups, and the expected closest outgroup species (Haustrum haustorium) appeared to be as similar to the in-group clusters as they were to each other. A dataset of 27 DNA sequences from an 827 bp portion of the large sub-unit 28S nuclear rRNA gene was produced with the intention of corroborating the findings from the analyses of the COI dataset. This consisted of 26 new sequences and one sequence from a published study that deposited the sequence on GenBank. The expected taxonomic arrangement of Haustrum scobina sensu lato could not be matched by COI sequences due to incongruence with the 28S phylogeny and shell morphology. The 28S dataset and shell morphology indicated there are two species in Haustrum scobina sensu lato. These are most likely Haustrum scobina and Haustrum albomarginatum, but they could not clearly be identified in the COI data. As a result, the phylogeographic certainty was limited when using the COI dataset because of the lack of clarity between the haplotypes of the two putative species. Possible reasons for the complicated COI dataset are discussed. Phylogenetic analysis of both the 28S and COI datasets did not support the expected conclusion that members of Haustrum scobina sensu lato are each other’s closest relatives. Haustrum haustorium was the expected immediate outgroup species but formed a polytomy with the in-group. A decrease in COI haplotype diversity was observed in southern samples when they were compared to the samples collected at northern locations. Taranaki sites shared a haplotype with multiple South Island sites that had no haplotype diversity. This suggested post-glacial re-colonisation of southern sites after displacement by ice-age conditions from these locations, a hypothesis consistent with results from studies of the Cominella genus. Association between Purau Bay in Lyttleton Harbour, Titahi Bay, Port Ahuriri and Kawau Island with no associated haplotypes between these locations suggested human-mediated translocation events. A genetic disjunction was also apparent between the south Wellington/Wairarapa coast and the eastern Wairarapa coast. This pattern was consistent with one study of Cominella maculosa and other studies have attributed similar patterns of other species in the region to recent uplift events affecting coastal community composition. The phylogeny of Haustrum scobina sensu lato will require further investigation before it can be used to more confidently resolve the phylogeographic history of the species.

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Significant northern range extension of the non-native batillariid Zeacumantus subcarinatus in Australia, with observations of new habitat usage

Mesaglio

Travaglini²

2023

Biol Invasions

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The New Zealand batillariid gastropod Zeacumantus subcarinatus has been recorded as an invasive species in Australia since at least 1924, with populations established in rocky shore habitats at multiple locations in Greater Sydney. We observed a large population (10,000+ individuals) of Z. subcarinatus at an estuarine tidal mudflat on the New South Wales mid-north coast, representing a ~ 250 km northern range extension, and the first known record of this species in a sheltered, muddy habitat in Australia. We discuss the possible establishment means of this new population.

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Genetic connectivity among populations of two congeneric direct-developing whelks varies across spatial scales

Cited by 16 publications

References 51 publications

Genetic structure of the grey side-gilled sea slug (Pleurobranchaea maculata) in coastal waters of New Zealand

Genetic structure of the grey side-gilled sea slug (Pleurobranchaea maculata) in coastal waters of New Zealand

A Nation-wide Phylogenetic and Phylogeographic Investigation of the Endemic New Zealand Oyster Borers, Haustrum scobina and Haustrum albomarginatum

Significant northern range extension of the non-native batillariid Zeacumantus subcarinatus in Australia, with observations of new habitat usage

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