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Environ Toxicol Chem

Title:		Contrasting Effects of Predation Risk and Copper on Copepod Respiration Rates
Author(s):		Lode T; Heuschele J; Andersen T; Titelman J; Hylland K; Borga K;
Address:		"Department of Biosciences, University of Oslo, Oslo, Norway"
Journal Title:		Environ Toxicol Chem
Year:		2020
Volume:		20200810
Issue:		9
Page Number:		1765 - 1773
DOI:		10.1002/etc.4804
ISSN/ISBN:		1552-8618 (Electronic) 0730-7268 (Linking)
Abstract:		"Natural biotic and anthropogenic stressors can interact to alter contaminant toxicity. Energetic restrictions are potential mechanisms causing this pattern. To identify processes underlying observed effects of predation risk and copper (Cu) on delayed copepod age at maturity, we examined how these 2 stressors affect respiration rates. We tested 2 very different copepod species: the large, pelagic calanoid Calanus finmarchicus and the small, semibenthic harpacticoid Tigriopus brevicornis. Adult individuals were exposed for 12 h to the treatments: predation risk, Cu (23 microg L(-1) ), combined predation risk and Cu (23 microg L(-1) ), or control. Oxygen concentrations were monitored continuously. The 2 species differed in their responses. We found no clear effects of either stressor in C. finmarchicus. In T. brevicornis, predation risk increased respiration rates, whereas Cu alone had little impact. In contrast, combined exposure to predation risk and Cu interacted to reduce respiration rates to less than expected. We further observed an effect of sex because female-biased T. brevicornis replicates were more sensitive to both predation risk (increased respiration rates) and Cu exposure (reduced respiration rates). The present study provides further evidence that predation risk can interact with copepod responses toward Cu exposure. Interactive effects of biotic stressors ought to be considered to improve future marine environmental monitoring. Environ Toxicol Chem 2020;39:1765-1773. (c) 2020 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC"
Keywords:		"Animals Copepoda/*drug effects Copper/*toxicity Female Male Predatory Behavior/*drug effects Respiratory Rate/*drug effects Risk Factors Rotation Sex Ratio Time Factors Water Pollutants, Chemical/toxicity Aquatic invertebrates Aquatic toxicology Kairomone;"
Notes:		"MedlineLode, Torben Heuschele, Jan Andersen, Tom Titelman, Josefin Hylland, Ketil Borga, Katrine eng Universitetet i Oslo/International Research Support, Non-U.S. Gov't 2020/06/20 Environ Toxicol Chem. 2020 Sep; 39(9):1765-1773. doi: 10.1002/etc.4804. Epub 2020 Aug 10"