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  • 1
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    Feeding and digestion of the marine isopod Idotea emarginata challenged by poor food quality and microplastics (2019)
    ELSEVIER SCIENCE INC
    In:  EPIC3Comparative Biochemistry and Physiology C-Toxicology & Pharmacology, ELSEVIER SCIENCE INC, ISSN: 1532-0456
    Details
    Publication Date: 2019-09-09
    Description: Ingestion of microplastics can impair nutrition of marine invertebrates. In a laboratory study, we tested whether microplastics affect ingestion rates and gastrointestinal enzyme activities in the marine isopod Idotea emarginata. Isopods were fed for eight days with one out of four different food formulations: natural food (the brown alga Fucus vesiculosus) or synthetic diet consisting of freeze-dried algal powder embedded in agarose, both, with or without microplastic particles (fluorescent polymethyl methacrylate, 10–100 μm) at a concentration of 40 items per mg of food. The isopods accepted both types of food but consumed significantly more (average 3.1-fold) of the agar based synthetic food. I. emarginata responded to the reduced content of digestible organic matter in the synthetic food by a compensatory adjustment of the ingestion rates. Addition of microplastics had no effect on ingestion rates in natural food whereas the feeding rates for synthetic food varied in response to microplastics. Similarly, activity patterns of digestive enzymes, particularly those of esterases, changed significantly in the treatment with synthetic food. Isopods fed with synthetic food alone showed elevated esterase activities in the gut while those isopods fed with synthetic food and microplastics showed elevated esterase activities in the midgut gland but not in the gut. Apparently, not the exposure to microplastic alone, but the combined effects of reduced nutrient availability and microplastic ingestion caused considerable biochemical reactions in the digestive organs of the isopods.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 2
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    Functional diversity and traits assembly patterns of benthic macrofaunal communities in the southern North Sea (2015)
    Springer International Publishing
    In:  EPIC3Towards an Interdisciplinary Approach in Earth System Science, SpringerBriefs in Earth System Sciences, (Springer Earth System Sciences), Heidelberg [u.a.], Springer International Publishing, 251 p., pp. 183-195, ISBN: 978-3-319-13864-0
    Details
    Publication Date: 2023-06-21
    Description: The study of ecosystem functioning – the fluxes of energy and material through biotic and abiotic components of an ecosystem – is becoming increasingly important in benthic ecological research. We investigated the functional structure of macrozoobenthic communities at four long-term sampling sites in the southern North Sea using biological traits assigned to life history, morphological and behavioural characteristics. The “typical” species of the macrofaunal assemblages at the sampling sites was characterized by small to medium body size, infaunal burrowing life style, deposit feeding habit, omnivory diet type, short to medium life span, gonochoristic sexual differentiation, 〈 2 years age at maturity, high fecundity, and planktotrophic development mode. Functional diversity differed significantly among the four sites. As part of the present study, trait information for 〉 330 macrofaunal taxa have been compiled in a comprehensive database.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Inbook , peerRev
    Format: application/pdf
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