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  • Springer  (2)
  • American Association for the Advancement of Science (AAAS)  (1)
  • Frontiers Media  (1)
  • 1
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract During the joint Chilean-German-Italian Magellan “Victor Hensen” Campaign in November 1994, samples were taken on a cruise of the RV Victor Hensen in order to obtain faunistic information from the Beagle Channel. Peracarida are an important fraction of the macrobenthos and were sampled in high numbers. Using an epibenthic sledge, 104,618 individuals were collected in total, comprising 62,860 Amphipoda, 14,685 Cumacea, 17,992 Isopoda, 7,168 Mysidacea and 1,893 Tanaidacea. To allow comparisons between stations, these numbers were standardized to a 1,000 m trawling distance, yielding about 368,000 individuals from all stations. Peracarida were most abundant at station 1213, southeast of Isla Picton, in the oceanic area close to the eastern entrance of the Beagle Channel (166,361 ind./1,000 m). Generally, stations off the eastern entrance were characterized by a high number of Peracarida. In the Beagle Channel itself, however, the abundance decreased from east to west with a single peak in peracarid number in the channel east of Punta Yámana. Numbers were much lower at the western entrance (792 ind./1,000 m) and even fewer Peracarida were collected in the Magdalena Channel off Punta Sánchez. Lowest numbers were recorded close to the glacier Romanche and west of Isla Picton at two locations. The composition of peracarid crustaceans was analysed in relation to the background of hydrographical and sedimentological differences, nutrient availability, and knowledge of the other associated fauna in the Beagle Channel. The available data lead us to conclude that abundance and composition of peracarid taxa in and south of the Beagle Channel (off the eastern entrance) seem to be influenced mainly by sediment composition and hydrographical characteristics as indicated above.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2018-01-19
    Description: Hydrothermal vents on mid-oceanic ridges are patchily distributed and host many taxa endemic to deep-sea chemosynthetic environments, whose dispersal may be constrained by geographical barriers. The aim of this study was to investigate the connectivity of three populations of the ‘scaly-foot gastropod’ (Chrysomallon squamiferum Chen et al., 2015), a species endemic to hydrothermal vents in the Indian Ocean, amongst two vent fields on the Central Indian Ridge (CIR) and Longqi field, the first sampled vent field on the Southwest Indian Ridge (SWIR). Connectivity and population structure across the two mid-oceanic ridges were investigated using a 489-bp fragment of the cytochrome oxidase c subunit I (COI) gene. Phylogeographical approaches used include measures of genetic differentiation (FST), reconstruction of parsimony haplotype network, mismatch analyses and neutrality tests. Relative migrants per generation were estimated between the fields. Significant differentiation (FST = 0.28–0.29, P 〈 0.001) was revealed between the vent field in SWIR and the two in CIR. Signatures were detected indicating recent bottleneck events followed by demographic expansion in all populations. Estimates of relative number of migrants were relatively low between the SWIR and CIR, compared with values between the CIR vent fields. The present study is the first to investigate connectivity between hydrothermal vents across two mid-ocean ridges in the Indian Ocean. The phylogeography revealed for C. squamiferum indicates low connectivity between SWIR and CIR vent populations, with implications for the future management of environmental impacts for seafloor mining at hydrothermal vents in the region, as proposed for Longqi.
    Type: Article , PeerReviewed
    Format: text
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  • 3
    Publication Date: 2022-05-27
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Rogers, A. D., Baco, A., Escobar-Briones, E., Gjerde, K., Gobin, J., Jaspars, M., Levin, L., Linse, K., Rabone, M., Ramirez-Llodra, E., Sellanes, J., Shank, T. M., Sink, K., Snelgrove, P. V. R., Taylor, M. L., Wagner, D., & Harden-Davies, H. Marine genetic resources in areas beyond national jurisdiction: promoting marine scientific research and enabling equitable benefit sharing. Frontiers in Marine Science, 8, (2021): 667274, https://doi.org/10.3389/fmars.2021.667274.
    Description: Growing human activity in areas beyond national jurisdiction (ABNJ) is driving increasing impacts on the biodiversity of this vast area of the ocean. As a result, the United Nations General Assembly committed to convening a series of intergovernmental conferences (IGCs) to develop an international legally-binding instrument (ILBI) for the conservation and sustainable use of marine biological diversity of ABNJ [the biodiversity beyond national jurisdiction (BBNJ) agreement] under the United Nations Convention on the Law of the Sea. The BBNJ agreement includes consideration of marine genetic resources (MGR) in ABNJ, including how to share benefits and promote marine scientific research whilst building capacity of developing states in science and technology. Three IGCs have been completed to date with the fourth delayed by the Covid pandemic. This delay has allowed a series of informal dialogues to take place between state parties, which have highlighted a number of areas related to MGR and benefit sharing that require technical guidance from ocean experts. These include: guiding principles on the access and use of MGR from ABNJ; the sharing of knowledge arising from research on MGR in ABNJ; and capacity building and technology transfer for developing states. In this paper, we explain what MGR are, the methods required to collect, study and archive them, including data arising from scientific investigation. We also explore the practical requirements of access by developing countries to scientific cruises, including the sharing of data, as well as participation in research and development on shore whilst promoting rather than hindering marine scientific research. We outline existing infrastructure and shared resources that facilitate access, research, development, and benefit sharing of MGR from ABNJ; and discuss existing gaps. We examine international capacity development and technology transfer schemes that might facilitate or complement non-monetary benefit sharing activities. We end the paper by highlighting what the ILBI can achieve in terms of access, utilization, and benefit sharing of MGR and how we might future-proof the BBNJ Agreement with respect to developments in science and technology.
    Description: We would like to thank the Governments of The Kingdom of Belgium, The Principality of Monaco and Costa Rica, as well as The Prince Albert II Monaco Foundation, The Norwegian Nobel Institute, The Nobel Institute, The High Seas Alliance, The Pew Charitable Trusts, Ocean Unite and REV Ocean for supporting the High Seas Treaty Dialogues which have allowed informal discussions between States representatives on the Biodiversity Beyond National Jurisdiction agreement.
    Keywords: high seas ; marine genetic resources ; access and benefit sharing ; UNCLOS ; developing states
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 4
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    American Association for the Advancement of Science (AAAS)
    In:  EPIC3Science, American Association for the Advancement of Science (AAAS), 382(6677), pp. 1384-1389, ISSN: 0036-8075
    Publication Date: 2024-02-22
    Description: The marine-based West Antarctic Ice Sheet (WAIS) is considered vulnerable to irreversible collapse under future climate trajectories, and its tipping point may lie within the mitigated warming scenarios of 1.5° to 2°C of the United Nations Paris Agreement. Knowledge of ice loss during similarly warm past climates could resolve this uncertainty, including the Last Interglacial when global sea levels were 5 to 10 meters higher than today and global average temperatures were 0.5° to 1.5°C warmer than preindustrial levels. Using a panel of genome-wide, single-nucleotide polymorphisms of a circum-Antarctic octopus, we show persistent, historic signals of gene flow only possible with complete WAIS collapse. Our results provide the first empirical evidence that the tipping point of WAIS loss could be reached even under stringent climate mitigation scenarios.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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