82 research outputs found

    Medusae (Scyphozoa and cubozoa) from southwestern atlantic and subantarctic region (32-60°s, 34-70°W): Species composition, spatial distribution and life history traits

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    In this study, we reported the species composition and spatial distribution of Scyphomedusae and Cubomedusae from the southwestern Atlantic and Subantarctic region and reviewed the available knowledge of life history traits of these species. We gathered the literature records and presented new information collected from oceanographic and fishery surveys carried out between 1981 and 2017, encompassing an area of approximately 6,7 million km2 (32-60°S, 34-70°W). We confirmed the occurrence of 15 scyphozoans and 1 cubozoan species previously reported in the region. Lychnorhiza lucerna and Chrysaora lactea were the most numerous species, reaching the highest abundances/biomasses during summer/autumn period. Desmonema gaudichaudi, Chrysaora plocamia, and Periphylla periphylla were frequently observed in low abundances, reaching high numbers only occasionally. Phacellophora camtschatica, Aurelia sp., Drymonema gorgo, Atolla chuni, Stygiomedusa gigantea and Pelagia cf. noctiluca were observed always in low numbers. Atolla wyvillei, Stomolophus meleagris, Desmonema comatum and Tamoya haplonema were reported just a few times and mostly individually. Although new species/reports can be found as surveys are undertaken, these results are considered to be the reliable baseline for further ecological studies seeking to understand the ecological role that these jellyfish play in marine ecosystems.Fil: Schiariti, Agustin. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas; Argentina. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; ArgentinaFil: Dutto, MarĂ­a SofĂ­a. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - BahĂ­a Blanca. Instituto Argentino de OceanografĂ­a. Universidad Nacional del Sur. Instituto Argentino de OceanografĂ­a; ArgentinaFil: Pereyra, Daiana Yanel. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas; ArgentinaFil: Siquier, Gabriela Failla. Universidad de la RepĂșblica; Uruguay. Universidad de la RepĂșblica. Facultad de Ciencias. Departamento de BiologĂ­a Animal. Laboratorio de ZoologĂ­a de Invertebrados ; UruguayFil: Morandini, AndrĂ© C.. Universidade de SĂŁo Paulo. Instituto de BiociĂȘncias. Departamento de ZoologĂ­a; Brasi

    Characterization of Epibenthic and Demersal Megafauan at Mississippi Canyon 252 Following the Deepwater Horizon Oil Spill

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    Increased demand for new sources of oil and gas has resulted in an expansion of drilling into deeper waters. With this exploratory drilling come increased risks, which were realized on April 20, 2010 when the blow out preventer on the Macondo Well failed, resulting in the release of a large quantity of oil and gas into the Northern Gulf of Mexico from a bathypelagic source. This unprecedented environmental disaster was coined the Deepwater Horizon Oil Spill by the popular news media. In the months that followed the spill, the lack of knowledge about the pre-spill condition of deep-sea communities in this area of the Gulf of Mexico became apparent. This made it difficult to determine the effects of the spill on deep-water megafauna. The objective of this study was to characterize the epibenthic and demersal megafaunal community immediately following and one year after the spill. Remotely operated vehicles conducted a series of video surveys over an extended time series (11 surveys Aug 4 – Nov 1, 2010) of a site located 750 m to the Southwest of the Macondo Well and at five additional study sites during August and September 2010: 2000m north, west, south, and east, and 500m north of the Macondo well. The 750 m Southwest site was revisited in July of 2011 to determine what, if any, changes had occurred in the deep-water megafaunal community. These study sites were dominated by demersal fishes and mobile benthic invertebrates both in 2010 and 2011. The results indicate both diversity and densities of organisms declined over time in 2010, while densities appeared to increase in 2011 to levels similar to those observed immediately following the spill. The presence of carcasses of pyrosomes, salps, and crabs in 2010 indicated some short-term or acute mortality following the spill. It is hoped that these data will be used as a post-spill baseline against which future surveys of diversity and abundance of deep-water megafauna can be compared

    Deep-sea life of Tanzania

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    Bibliography on the Scyphozoa with selected references on Hydrozoa and Anthozoa

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    Our goal in assembling this bibliography has been to bring together literature references on all aspects of scyphozoan research. Compilation was begun in 1967 as a card file of references to publications on the Scyphozoa; selected references to hydrozoan and anthozoan studies that were considered relevant to the study of scyphozoans were included. In 1968, a major research program on the jellyfish of Chesapeake Bay was initiated at the Virginia Institute of Marine Science (VIMS) under Dr. E. B. Joseph, and work on the bibliography became an integral part of the program. In 1969 we began converting the bibliography into a form suitable for wider distribution, and in February 1970 a preliminary draft was completed. The present bibliography is an expanded and revised version of the preliminary draft
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