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      Physiological capacity of Cancer setosus larvae — Adaptation to El Niño Southern Oscillation conditions

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      General Information:

      Citation:
      Weiss, M. , Heilmayer, O. , Brey, T. , Lucassen, M. and Pörtner, H. O. (2012): Physiological capacity of Cancer setosus larvae — Adaptation to El Niño Southern Oscillation conditions , Journal of Experimental Marine Biology and Ecology, 413 , pp. 100-105 . doi: 10.1016/j.jembe.2011.11.023
      Cite this page as:
      hdl:10013/epic.38761
      DOI:
      10.1016/j.jembe.2011.11.023
      Official URL:
      10.1016/j.jembe.2011.11.023
      Contact Email:
      Thomas.Brey@awi.de
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      Cite this document as:
      hdl:10013/epic.38761.d001
      Abstract:

      Temperature changes during ENSO challenge the fauna of the Pacific South American coast. In many ectotherm benthic species pelagic larvae are the most important dispersal stage, which may, however, be particularly vulnerable to such environmental stress. Thermal limitation in aquatic ecotherms is hypothesized to be reflected first in the aerobic scope of an animal. Here we present results on whole animal oxygen consumption and on the activities of two metabolic key enzymes, citrate synthase (CS) and pyruvate kinase (PK)) of Cancer setosus zoeal larvae, acclimated to different temperatures. Larvae acclimated to cooler temperatures (12 and 16 °C) were able to compensate for the temperature effect as reflected in elevated mass specific respiration rates (MSR) and enzyme activities. In contrast, warm acclimated larvae (20 and 22 °C) seem to have reached their upper thermal limits, which is reflected in MSR decoupling from temperature and low Q10 values (Zoea I: 1.4; Zoea III: 1.02). Thermal deactivation of CS in vitro occurred close to habitat temperature (between 20 and 24 °C), indicating instability of the enzyme close to in vivo thermal limits. The capacity of anaerobic metabolism, reflected by PK, was not influenced by temperature, but increased with instar, reflecting behavioral changes in larval life style. Functioning of the metabolic key enzyme CS was identified to be one possible key for larval limitation in temperature tolerance.

      Further Details:

      Item Type:
      Article
      Authors:
      Weiss, Monika ; Heilmayer, Olaf ; Brey, Thomas ; Lucassen, Magnus ; Pörtner, Hans-Otto
      Divisions:
      AWI Organizations > Biosciences > Functional Ecology
      AWI Organizations > Biosciences > Integrative Ecophysiology
      Programs:
      Helmholtz Research Programs > PACES I (2009-2013) > TOPIC 1: The Changing Arctic and Antarctic > WP 1.6: Ocean Warming and Acidification: Organisms and their changing Role in Marine Ecosystems
      Eprint ID:
      25802
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