Short-term variation of nutritive and metabolic parameters in Temora longicornis females (Crustacea, Copepoda) as a response to diet shift and starvation

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• 作者：Tobias Kreibich (1)
  Reinhard Saborowski (2)
  Wilhelm Hagen (3)
  Barbara Niehoff (1)
  
• 关键词：Temora longicornis ; Digestive enzymes ; Metabolism ; Fatty acids ; Starvation
• 刊名：Helgoland Marine Research
• 出版年：2008
• 出版时间：September 2008
• 年：2008
• 卷：62
• 期：3
• 页码：241-249
• 全文大小：444KB
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• 作者单位：Tobias Kreibich (1)
  Reinhard Saborowski (2)
  Wilhelm Hagen (3)
  Barbara Niehoff (1)
  
  1. Alfred-Wegener Institute for Polar and Marine Research, Am Alten Hafen 26, 27568, Bremerhaven, Germany
  2. Biologische Anstalt Helgoland, Alfred-Wegener Institute for Polar and Marine Research, 27483, Helgoland, Germany
  3. Marine Zoology (FB 2), University of Bremen, P.O. Box 330440, 28334, Bremen, Germany
  

文摘

Changes in fatty acid patterns, digestive and metabolic enzyme activities and egg production rates (EPR) were studied in the small calanoid copepod Temora longicornis. Female copepods were collected in spring 2005 off Helgoland (North Sea). In the laboratory one group of copepods was fed with the cryptophycean Rhodomonas baltica for a period of 3?days. Another group of copepods was maintained without food. According to the fatty acid patterns, animals from the field were feeding on a more detrital, animal-based and to a minor extent to a diatom-based diet. Under laboratory conditions, females rapidly accumulated fatty acids such as 18:4 (n-3), 18:3 (n-3) and 18:2 (n-6) which are specific of R. baltica. Diatom-specific fatty acids such as 16:1 (n-7) were strongly reduced. In fed animals the activities of digestive and metabolic enzymes remained constant and egg production rates were highest on day?2. Starving animals, in contrast, showed significantly reduced faecal pellet production and EPR. Proteolytic enzyme activity decreased rapidly within 24?h and remained at a low level until the end of the experiment. Citrate synthase decreased continuously as well. T. longicornis rapidly reacts to dietary changes and food depletion. It has limited energy stores and, thus, strongly depends on continuous food supply.