Limited phylogeographic structure for five bathyal ophiuroids at continental scales

O’Hara, Timothy D.; England, Phillip R.; Gunasekera, Rasanthi M.; Naughton, Kate

doi:10.1016/j.dsr.2013.09.009

Cited by 37 publications

(48 citation statements)

References 71 publications

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“…This evidence of population structure on 10‐km scales could not be explained by our circulation model, and could be related to cryptic speciation and/or unexplained characteristics of the reproductive biology of P. craigi causing limited dispersal under some conditions. On the other hand, connectivity patterns over almost 1,000 km as observed between UK‐1A and APEI‐6 populations are not unexpected, since gene flow in the deep sea appears generally more extensive horizontally over large distances than vertically (Clague, Jones, Paduan, Clague, & Vrijenhoek, ; O'Hara, England, Guasekera, & Naughton, ). However, there is no direct knowledge of the reproductive or larval biology of P. craigi, and our current understanding of circulation patterns near the CCZ floor remains limited, requiring caution in the interpretation of our circulation modelling.…”

Section: Discussionmentioning

confidence: 96%

Implications of population connectivity studies for the design of marine protected areas in the deep sea: An example of a demosponge from the Clarion‐Clipperton Zone

et al. 2018

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The abyssal demosponge Plenaster craigi inhabits the Clarion‐Clipperton Zone (CCZ) in the northeast Pacific, a region with abundant seafloor polymetallic nodules with potential mining interest. Since P. craigi is a very abundant encrusting sponge on nodules, understanding its genetic diversity and connectivity could provide important insights into extinction risks and design of marine protected areas. Our main aim was to assess the effectiveness of the Area of Particular Environmental Interest 6 (APEI‐6) as a potential genetic reservoir for three adjacent mining exploration contract areas (UK‐1A, UK‐1B and OMS‐1A). As in many other sponges, COI showed extremely low variability even for samples ~900 km apart. Conversely, the 168 individuals of P. craigi, genotyped for 11 microsatellite markers, provided strong genetic structure at large geographical scales not explained by isolation by distance (IBD). Interestingly, we detected molecular affinities between samples from APEI‐6 and UK‐1A, despite being separated ~800 km. Although our migration analysis inferred very little progeny dispersal of individuals between areas, the major differentiation of OMS‐1A from the other areas might be explained by the occurrence of predominantly northeasterly transport predicted by the HYCOM hydrodynamic model. Our study suggests that although APEI‐6 does serve a conservation role, with species connectivity to the exploration areas, it is on its own inadequate as a propagule source for P. craigi for the entire eastern portion of the CCZ. Our new data suggest that an APEI located to the east and/or the south of the UK‐1, OMS‐1, BGR, TOML and NORI areas would be highly valuable.

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Section: Discussionmentioning

confidence: 96%

Implications of population connectivity studies for the design of marine protected areas in the deep sea: An example of a demosponge from the Clarion‐Clipperton Zone

et al. 2018

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“…Four other dispersals might be inferred around South Africa, but these represent species (Ophiotrichidae: Ophiothrix (Ophiothrix) aristulata Lyman, 1879; Ophiodermatidae: Ophioderma wahlbergii Müller & Troschel, 1842, Cryptopelta aster (Lyman, 1879), Ophiarachnella capensis (Bell, 1888)) with narrow distribution across the Atlantic and Indo‐West Pacific RES (Table S1). Only the deeper species O. aristulata (50–650 m; O'Hara, ) has a significant distribution outside southern Africa, being also reported from Australia and New Zealand (O'Hara, England, Gunasekera, & Naughton, ), and represents a significant incursion of an Atlantic clade across the Indian Ocean. However, its pattern of distribution may be more indicative of southern upper bathyal species rather than shallow‐water tropical fauna.…”

Section: Discussionmentioning

confidence: 99%

Global biogeographic structuring of tropical shallow‐water brittle stars

Bribiesca‐Contreras

Verbruggen

Hugall

et al. 2019

Journal of Biogeography

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Aim Biogeographic barriers emerged in the tropical oceans as continental masses moved with plate tectonics, and as the tropics contracted to lower latitudes from the late Eocene. These barriers have shaped tropical marine biodiversity. We characterize large‐scale diversity patterns for tropical brittle stars and investigate the effect of biogeographic barriers on these in space and time. Location Shallow‐water (<200 m) tropical oceans. Taxon Tropical shallow‐water brittle stars (class Ophiuroidea). Methods We integrate phylogenetic and biogeographic modelling to test and quantify the biogeographic structuring across the major ocean basins for five families of brittle stars. These are well‐sampled in our phylogenies (173 species) and represent an important component of the brittle star fauna of tropical shallow waters. We define major bioregions based on patterns of compositional and phylogenetic beta diversity. Results We find congruence between patterns of shared ancestry of regions and inferred biogeographic histories. Biogeographic reconstructions show that faunal patterns reflect the emergence of biogeographic barriers in the tropical world, with evidence of vicariant events driven by the opening of the Atlantic Ocean, the narrowing of the Tethyan Seaway and the rise of the Isthmus of Panama. Main conclusions Biogeographic barriers almost completely isolated regional faunas. However, divergence age estimates predate the onset of the different barriers, suggesting that changes associated with the gradual emergence of the barriers had a strong effect on the evolutionary history of tropical shallow‐water brittle stars. Limited, very recent, bi‐directional dispersal was detected across the East Pacific Barrier, which is otherwise an important barrier for dispersal of brittle stars.

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“…Depth is an important factor contributing to patterns of genetic connectivity for some benthic fauna, particularly for taxa that are distributed across a wide depth range (Brandão, Sauer, & Schön, ; Miller et al., ; O'Hara, England, Gunasekera, & Naughton, ; Ruiz‐Ramos et al., ). In the present study, there was no evidence for isolation by depth (across the depth range 322–1,805 m) for S. variabilis .…”

Section: Discussionmentioning

confidence: 99%

Population genetic structure and connectivity of deep‐sea stony corals (Order Scleractinia) in the New Zealand region: Implications for the conservation and management of vulnerable marine ecosystems

Zeng

Rowden

Clark

et al. 2017

Evolutionary Applications

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Deep‐sea stony corals, which can be fragile, long‐lived, late to mature and habitat‐forming, are defined as vulnerable marine ecosystem indicator taxa. Under United Nations resolutions, these corals require protection from human disturbance such as fishing. To better understand the vulnerability of stony corals (Goniocorella dumosa, Madrepora oculata, Solenosmilia variabilis) to disturbance within the New Zealand region and to guide marine protected area design, genetic structure and connectivity were determined using microsatellite loci and DNA sequencing. Analyses compared population genetic differentiation between two biogeographic provinces, amongst three subregions (north–central–south) and amongst geomorphic features. Extensive population genetic differentiation was revealed by microsatellite variation, whilst DNA sequencing revealed very little differentiation. For G. dumosa, genetic differentiation existed amongst regions and geomorphic features, but not between provinces. For M. oculata, only a north–central–south regional structure was observed. For S. variabilis, genetic differentiation was observed between provinces, amongst regions and amongst geomorphic features. Populations on the Kermadec Ridge were genetically different from Chatham Rise populations for all three species. A significant isolation‐by‐depth pattern was observed for both marker types in G. dumosa and also in ITS of M. oculata. An isolation‐by‐distance pattern was revealed for microsatellite variation in S. variabilis. Medium to high levels of self‐recruitment were detected in all geomorphic populations, and rates and routes of genetic connectivity were species‐specific. These patterns of population genetic structure and connectivity at a range of spatial scales indicate that flexible spatial management approaches are required for the conservation of deep‐sea corals around New Zealand.

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Limited phylogeographic structure for five bathyal ophiuroids at continental scales

Cited by 37 publications

References 71 publications

Implications of population connectivity studies for the design of marine protected areas in the deep sea: An example of a demosponge from the Clarion‐Clipperton Zone

Implications of population connectivity studies for the design of marine protected areas in the deep sea: An example of a demosponge from the Clarion‐Clipperton Zone

Global biogeographic structuring of tropical shallow‐water brittle stars

Population genetic structure and connectivity of deep‐sea stony corals (Order Scleractinia) in the New Zealand region: Implications for the conservation and management of vulnerable marine ecosystems

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