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Alex Rogers - One of the best experts on this subject based on the ideXlab platform.
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lionfish pterois spp invade the upper Bathyal Zone in the western atlantic
PeerJ, 2017Co-Authors: Erika Gress, Dominic A Andradibrown, Lucy C Woodall, Pamela J Schofield, Karl Stanley, Alex RogersAbstract:Non-native lionfish have been recorded throughout the western Atlantic on both shallow and mesophotic reefs, where they have been linked to declines in reef health. In this study we report the first lionfish observations from the deep sea (>200 m) in Bermuda and Roatan, Honduras, with lionfish observed to a maximum depth of 304 m off the Bermuda platform, and 250 m off West End, Roatan. Placed in the context of other deeper lionfish observations and records, our results imply that lionfish may be present in the 200-300 m depth range of the upper-Bathyal Zone across many locations in the western Atlantic, but currently are under-sampled compared to shallow habitats. We highlight the need for considering deep-sea lionfish populations in future invasive lionfish management.
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genetic structure of the deep sea coral lophelia pertusa in the northeast atlantic revealed by microsatellites and internal transcribed spacer sequences
Molecular Ecology, 2004Co-Authors: M Le C Goffvitry, Oliver G Pybus, Alex RogersAbstract:The azooxanthellate scleractinian coral Lophelia pertusa has a near-cosmopolitan distribution, with a main depth distribution between 200 and 1000 m. In the northeast Atlantic it is the main framework-building species, forming deep-sea reefs in the Bathyal Zone on the continental margin, offshore banks and in Scandinavian fjords. Recent studies have shown that deep-sea reefs are associated with a highly diverse fauna. Such deep-sea communities are subject to increasing impact from deep-water fisheries, against a background of poor knowledge concerning these ecosystems, including the biology and population structure of L. pertusa. To resolve the population structure and to assess the dispersal potential of this deep-sea coral, specific microsatellites markers and ribosomal internal transcribed spacer (ITS) sequences ITS1 and ITS2 were used to investigate 10 different sampling sites, distributed along the European margin and in Scandinavian fjords. Both microsatellite and gene sequence data showed that L. pertusa should not be considered as one panmictic population in the northeast Atlantic but instead forms distinct, offshore and fjord populations. Results also suggest that, if some gene flow is occurring along the continental slope, the recruitment of sexually produced larvae is likely to be strongly local. The microsatellites showed significant levels of inbreeding and revealed that the level of genetic diversity and the contribution of asexual reproduction to the maintenance of the subpopulations were highly variable from site to site. These results are of major importance in the generation of a sustainable management strategy for these diversity-rich deep-sea ecosystems.
Ad Rogers - One of the best experts on this subject based on the ideXlab platform.
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Lionfish (Pterois spp.) invade the upper-Bathyal Zone in the western Atlantic
'PeerJ', 2017Co-Authors: Gress E, Da Andradi-brown, Woodall L, Pj Schofield, Stanley K, Ad RogersAbstract:Non-native lionfish have been widely recorded throughout the western Atlantic on both shallow and mesophotic reefs, where they have been linked to declines in reef health. In this study we report the first lionfish observations from the deep sea (>200 m) in Bermuda and Roatan, Honduras, with lionfish observed to a maximum depth of 304 m off the Bermuda platform, and 250 m off West End, Roatan. Placed in the context of other deeper lionfish observations and records, our results imply that lionfish may be found more widely in the 200-300 m depth range of the upper Bathyal Zone across the western Atlantic, but currently are under sampled compared to shallow habitats. We highlight the need for considering deep-sea lionfish populations in future invasive lionfish management
Dominic A Andradibrown - One of the best experts on this subject based on the ideXlab platform.
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lionfish pterois spp invade the upper Bathyal Zone in the western atlantic
PeerJ, 2017Co-Authors: Erika Gress, Dominic A Andradibrown, Lucy C Woodall, Pamela J Schofield, Karl Stanley, Alex RogersAbstract:Non-native lionfish have been recorded throughout the western Atlantic on both shallow and mesophotic reefs, where they have been linked to declines in reef health. In this study we report the first lionfish observations from the deep sea (>200 m) in Bermuda and Roatan, Honduras, with lionfish observed to a maximum depth of 304 m off the Bermuda platform, and 250 m off West End, Roatan. Placed in the context of other deeper lionfish observations and records, our results imply that lionfish may be present in the 200-300 m depth range of the upper-Bathyal Zone across many locations in the western Atlantic, but currently are under-sampled compared to shallow habitats. We highlight the need for considering deep-sea lionfish populations in future invasive lionfish management.
Pierre Hantzpergue - One of the best experts on this subject based on the ideXlab platform.
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ecological significance of the arthropod fauna from the jurassic callovian la voulte lagerstatte
Acta Palaeontologica Polonica, 2010Co-Authors: Sylvain Charbonnier, Jean Vannier, Pierre Hantzpergue, Christian GaillardAbstract:The La Voulte Lagerstatte is remarkable for its unique soft-bodied fauna (e.g., worms, coleoid squids) and its exceptionally preserved arthropods mainly found in small sideritic concretions. This arthropod fauna includes 30 different species assigned to the crustaceans, the thylacocephalans and the pycnogonids. Crustaceans are the most diversified group with 23 species distributed in a dozen families. Quantitative analyses based on 388 nodules reveals four dominant groups: (i) the enigmatic thylacocephalan arthropods (33%), (ii) the Solenoceridae shrimps (22%), (iii) the Coleiidae crustaceans (15%), and (iv) the Penaeidae shrimps (10%). Converging lines of evidence from depositional environment and modern analogues, indicate that this arthropod fauna probably inhabited a deep water setting most probably exceeding 200 m (= Bathyal Zone) under dysphotic or aphotic conditions. This new set of data sheds new light on the deep-sea colonisation by animal communities in the Mesozoic.
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the la voulte lagerstatte callovian evidence for a deep water setting from sponge and crinoid communities
Palaeogeography Palaeoclimatology Palaeoecology, 2007Co-Authors: Sylvain Charbonnier, Jean Vannier, Christian Gaillard, Jeanpaul Bourseau, Pierre HantzpergueAbstract:The siliceous sponges and crinoids from the Chenier Ravine (France, Lower Callovian) are used here as biological markers to characterize the palaeoenvironment of the adjacent and contemporaneous La Voulte Lagerstatte that is remarkable for its unique soft-bodied fauna (e.g. worms, cirrate octopods, vampire squids). Sponges are abundant with dominant hexactinellids (80%) and lithistids (20%). Four lines of fossil evidence, supported by Recent analogues, indicate that this sponge community inhabited deepwater setting under dysphotic or aphotic conditions: (1) the dominance of hexactinellids; (2) the prevalence of cone-shaped and erect morphologies that usually characterize Recent Bathyal sponges; (3) the close similarities with Recent hexactinellids from the continental slope and; (4) the lack of encrustation by photophilic organisms. Attachments of sponges on hard substrate (e.g. crystalline basement) and their preservation in soft sediments (e.g. muds) indicate heterogeneous bottom conditions. The Chenier fauna also contains small stalked, asymmetric cyrtocrinid crinoids that are known to live on hard substrates in Bathyal environments such as the SW Pacific steep seamounts. Convergent palaeoenvironmental clues obtained from both crinoids and siliceous sponges support the notion that the La Voulte area, including the La Voulte Lagerstatte, was situated in the upper part of the Bathyal Zone near the slope-basin transition with a water depth most probably exceeding 200 m. Supporting evidence from heterogeneous substrates and complex fault systems indicate a depositional environment along the external part of the slope where steep topographies and blocks usually favour the settlement of cyrtocrinid crinoids and hexactinellid sponges. La Voulte may therefore be one of the rare and extremely precious Mesozoic Lagerstatten to have fossilized a deep marine environment
Appy Sluijs - One of the best experts on this subject based on the ideXlab platform.
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a new fossil lagerstatte from the lower eocene of lessini mountains northern italy a multidisciplinary approach
Palaeogeography Palaeoclimatology Palaeoecology, 2014Co-Authors: Luca Giusberti, Alexander Bannikov, Flavia Boscolo Galazzo, Valeria Luciani, Cesare Andrea Papazzoni, Eliana Fornaciari, Joost Frieling, Guido Roghi, Stefan Schouten, Appy SluijsAbstract:Hemipelagic dark limestones within calciturbiditic deposits at Monte Solane in the western Lessini Mountains of northern Italy yield a fish fauna dominated by stomiiforms. A minor component of the fossil assemblage is represented by a macroalgal non-calcareous flora associated with rarer terrestrial components including few angiosperm leaves and seeds. Micropaleontological (foraminifera, dinoflagellate cysts), sedimentological and geochemical proxies (TEX86) indicate a deposition of the fossil-bearing bed in a hypoxic to possibly anoxic, warm, restricted basin. High-precision dating based on rich foraminiferal and calcareous nannoplankton content allows ascribing the site to the upper part of the Ypresian (Lower Eocene). The site is slightly older than the Ypresian worldwide-famous shallow-water Bolca Konservat-Lagerstatte located in the same region. Convergent paleoenvironmental clues based on both microfossils and ichthyofauna indicate that the sediments were deposited in the upper Bathyal Zone, probably between 300 and 600 m. Solane is therefore one of the rare and precious Eocene Lagerstatte to have fossilized in a deep marine setting. The site contains the oldest Cenozoic record of an ichthyofauna dominated by meso-bathypelagic taxa.
