Biogeographic relationships among deep-sea hydrothermal vent faunas at global scale

Bachraty, Charleyne; Legendre, Pierre; Desbruyères, Daniel

doi:10.1038/npre.2008.1823.1

Cited by 30 publications

(87 citation statements)

References 17 publications

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“…We used multivariate classifi cation and regression tree analysis (mCART; Bachraty et al 2009) to identify the major NEP biogeographic provinces. We used multivariate classifi cation and regression tree analysis (mCART; Bachraty et al 2009) to identify the major NEP biogeographic provinces.…”

Section: Assessing Nep Biogeographic Structurementioning

confidence: 99%

“…We used multivariate classifi cation and regression tree analysis (mCART; Bachraty et al 2009) to identify the major NEP biogeographic provinces. Because latitude is used to enforce spatial contiguity onto the formation of provinces (Bachraty et al 2009), the mCART analysis ensures that sites making up the latitudinal extent of provinces will be adjacent to each other. provinces; Bachraty et al 2009).…”

Section: Assessing Nep Biogeographic Structurementioning

confidence: 99%

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Biogeographic structure of the northeastern Pacific rocky intertidal: the role of upwelling and dispersal to drive patterns

et al. 2014

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Identifying the environmental conditions that drive biogeographic structure remains a major challenge of biogeography, evolutionary ecology and increasingly, conservation biology. Here, we use multivariate classification trees to assess the biogeographic structure of northeast Pacific (∼ 26–58°N) rocky intertidal species (406 species of algae and invertebrates) from 102 field sites. Random forest analyses are used to assess the importance of 29 environmental variables, encompassing a broad range of potential drivers, to predict biogeographic structure. Analyses are repeated for species with different larval dispersal capabilities and by broad taxonomic categories (invertebrates and algae). Results show that overall biogeographic structure is in general agreement with classic classification schemes, but patterns are variable among species with different larval dispersal capabilities. Random forest models show a very high fit (pseudo r2 > 0.94) and indicate that biogeographic structure can be predicted by a relatively modest subset of variables. Upwelling related variables are the best overall predictors of biogeographic structure (nutrient concentrations, sea‐surface temperature, upwelling/downwelling seasonal switch index), but the relative importance of predictors is geographically variable and top predictors are dependent on the type of larval dispersal. Upwelling related variables are more important to predict biogeographic structure for invertebrates with lower‐medium dispersal capabilities and algae, whereas species with high larval dispersal (planktotrophic) are better predicted by a different subset of variables (i.e. salinity, precipitation seasonality). Our results lend support to the influence of coastal upwelling in structuring biogeographic patterns and highlight the potential for climate change‐induced alterations of upwelling regimes to profoundly affect biodiversity at biogeographic scales.

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Section: Assessing Nep Biogeographic Structurementioning

confidence: 99%

Section: Assessing Nep Biogeographic Structurementioning

confidence: 99%

Biogeographic structure of the northeastern Pacific rocky intertidal: the role of upwelling and dispersal to drive patterns

et al. 2014

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“…Studies of the hydrothermal vent fauna have defined several biogeographic provinces (EPR, Northern Pacific, MAR…) based on faunal composition and patterns of endemicity which are consistent with historical geological events. The latest analysis, which included hydrothermal vent fauna from 63 vent fields, supported the presence of 6 major biogeographic provinces [13]. Meanwhile cold seeps have been discovered worldwide along continental margins and have also been grouped into several biogeographic provinces (Gulf of Mexico, Atlantic, Mediterranean, East Pacific and West Pacific) [9].…”

Section: Introductionmentioning

confidence: 97%

Biogeography and Potential Exchanges Among the Atlantic Equatorial Belt Cold-Seep Faunas

et al. 2010

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Like hydrothermal vents along oceanic ridges, cold seeps are patchy and isolated ecosystems along continental margins, extending from bathyal to abyssal depths. The Atlantic Equatorial Belt (AEB), from the Gulf of Mexico to the Gulf of Guinea, was one focus of the Census of Marine Life ChEss (Chemosynthetic Ecosystems) program to study biogeography of seep and vent fauna. We present a review and analysis of collections from five seep regions along the AEB: the Gulf of Mexico where extensive faunal sampling has been conducted from 400 to 3300m, the Barbados accretionary prism, the Blake ridge diapir, and in the Eastern Atlantic from the Congo and Gabon margins and the recently explored Nigeria margin. Of the 72 taxa identified at the species level, a total of 9 species or species complexes are identified as amphi-Atlantic. Similarity analyses based on both Bray Curtis and Hellinger distances among 9 faunal collections, and principal component analysis based on presence/absence of megafauna species at these sites, suggest that within the AEB seep megafauna community structure is influenced primarily by depth rather than by geographic distance. Depth segregation is observed between 1000 and 2000m, with the middle slope sites either grouped with those deeper than 2000m or with the shallower sites. The highest level of community similarity was found between the seeps of the Florida escarpment and Congo margin. In the western Atlantic, the highest degree of similarity is observed between the shallowest sites of the Barbados prism and of the Louisiana slope. The high number of amphi-atlantic cold-seep species that do not cluster according to biogeographic regions, and the importance of depth in structuring AEB cold-seep communities are the major conclusions of this study. The hydrothermal vent sites along the Mid Atlantic Ridge (MAR) did not appear as “stepping stones” for dispersal of the AEB seep fauna, however, the south MAR and off axis regions should be further explored to more fully test this hypothesis.

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“…These animal communities lie in a distinct biogeographic province of hydrothermal vent invertebrates, although most of the components also have evolutionary links to their relatives in the Western Pacific and Atlantic hydrothermal environments [4], [5]. Recent statistical work on connections among biogeographical provinces [11] and population connectivities [12] also highlighted similarities between western Pacific and Indian Ocean vent communities. As they pointed out, however, the overall placement of the Indian Ocean hydrothermal vent invertebrate communities with respect to biogeographic province has remained poorly understood because of the paucity of data sets, i.e., only two hydrothermal vent communities found on the Central Indian Ridge (CIR) had been investigated in the Indian Ocean.…”

Section: Introductionmentioning

confidence: 99%

Discovery of New Hydrothermal Activity and Chemosynthetic Fauna on the Central Indian Ridge at 18°–20°S

et al. 2012

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Indian Ocean hydrothermal vents are believed to represent a novel biogeographic province, and are host to many novel genera and families of animals, potentially indigenous to Indian Ocean hydrothermal systems. In particular, since its discovery in 2001, much attention has been paid to a so-called ‘scaly-foot’ gastropod because of its unique iron-sulfide-coated dermal sclerites and the chemosynthetic symbioses in its various tissues. Despite increasing interest in the faunal assemblages at Indian Ocean hydrothermal vents, only two hydrothermal vent fields have been investigated in the Indian Ocean. Here we report two newly discovered hydrothermal vent fields, the Dodo and Solitaire fields, which are located in the Central Indian Ridge (CIR) segments 16 and 15, respectively. Chemosynthetic faunal communities at the Dodo field are emaciated in size and composition. In contrast, at the Solitaire field, we observed faunal communities that potentially contained almost all genera found at CIR hydrothermal environments to date, and even identified previously unreported taxa. Moreover, a new morphotype of ‘scaly-foot’ gastropod has been found at the Solitaire field. The newly discovered ‘scaly-foot’ gastropod has similar morphological and anatomical features to the previously reported type that inhabits the Kairei field, and both types of ‘scaly-foot’ gastropods genetically belong to the same species according to analyses of their COI gene and nuclear SSU rRNA gene sequences. However, the new morphotype completely lacks an iron-sulfide coating on the sclerites, which had been believed to be a novel feature restricted to ‘scaly-foot’ gastropods. Our new findings at the two newly discovered hydrothermal vent sites provide important insights into the biodiversity and biogeography of vent-endemic ecosystems in the Indian Ocean.

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Biogeographic relationships among deep-sea hydrothermal vent faunas at global scale

Cited by 30 publications

References 17 publications

Biogeographic structure of the northeastern Pacific rocky intertidal: the role of upwelling and dispersal to drive patterns

Biogeographic structure of the northeastern Pacific rocky intertidal: the role of upwelling and dispersal to drive patterns

Biogeography and Potential Exchanges Among the Atlantic Equatorial Belt Cold-Seep Faunas

Discovery of New Hydrothermal Activity and Chemosynthetic Fauna on the Central Indian Ridge at 18°–20°S

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