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  • INTER-RESEARCH  (1)
  • Wiley-Blackwell  (1)
  • 2010-2014  (2)
  • 1
    Publication Date: 2019-07-16
    Description: We compared six biogeographically and climatically distinct population of extremely long-lived ocean quahog Arctica islandica, for age-dependent differences in metabolic rates and antioxidant capacities (superoxide dismutase, catalase activity and total glutathione concentration). Different geographic locations, covering a temperature and salinity gradient of 3.7–9.3 °C and 20–35 ppt from the Norwegian coast, White Sea, Iceland, Kattegat, Kiel Bay and German Bight. The bivalve shells were used as age recorders by counting annual growth bands. Maximum lifespan in different populations varied between 30 and 192 y. The exceptionally long lifespan of A. islandica cannot be exclusively explained by a better-established antioxidant defense system. Extreme longevity observed in some North Atlantic populations seems to be grounded in its very low lifetime mass specific respiration, in combination with stable maintenance of antioxidant protection over life in mature specimens. The shorter-lived populations have the highest metabolic rates and show no metabolic response (Q10) when warmed to higher temperature. Low and fluctuating salinity in Baltic exerts a stress, which enhances respiration rates and shortens longevity.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 2
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    Wiley-Blackwell
    In:  EPIC3Methods for the study of marine benthos, Methods for the study of marine benthos, West Sussex, Wiley-Blackwell, 78 p., pp. 329-407, ISBN: 978-0-470-67086-6
    Publication Date: 2014-04-15
    Description: Traditionally, the rationale for energy flow studies was found in the elucidation of energy transfers within ecosystems or within the practical context of the rational management of resources, but it is now widely recognised that its scope embodies almost all biology, including the field of population dynamics and evolutionary studies. Here, we first describe conceptual models of energy and mass budgets at the level of the individual, the population and the community. However, the emphasis is on the next part in which the practicalities of measuring the various components of these budgets in the marine zoobenthic community are described in detail. The measurement of, among other things, ingestion, absorption, defaecation, excretion, growth, reproduction and respiration is discussed. Finally, attention is paid to the estimation of secondary production of benthic populations and to community-level modelling methods.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Inbook , peerRev
    Format: application/pdf
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