The combined effects of ocean acidification and warming on a habitat-forming shell-crushing predatory crab

Manríquez, Patricio H., Gonzalez, Claudio P., Seguel, Mylene, Garcia-Huidobro, M. Roberto, Lohrmann, Karin B., Domenici, Paolo, Watson, Sue-Ann, Duarte, Cristián, and Brokordt, Katherina (2021) The combined effects of ocean acidification and warming on a habitat-forming shell-crushing predatory crab. Science of the Total Environment, 758. 143587.

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Abstract

In mid rocky intertidal habitats the mussel Perumytilus purpurarus monopolizes the substratumto the detriment of many other species. However, the consumption of mussels by the shell-crushing crab Acanthocyclus hassleri creates within the mussel beds space and habitat for several other species. This crab uses its disproportionately large claw to crush its shelled prey and plays an important role in maintaining species biodiversity. This study evaluated the consequences of projected near-future ocean acidification (OA) and warming (OW) on traits of A. hassleri linked with their predatory performance. Individual A. hassleri were maintained for 10-16 weeks under contrasting pCO(2) (similar to 500 and 1400 mu atm) and temperature (similar to 15 and 20 degrees C) levels. We compared traits at the organismal (oxygen consumption rate, survival, calcification rate, feeding rates, crusher claw pinching strength, self-righting speed, sarcomere length of the crusher claw muscles) and cellular (nutritional status ATP provisioning capacity through citrate synthase activity, expression of HSP70) level. Survival, calcification rate and sarcomere length were not affected by OA and OW. However, OW increased significantly feeding and, oxygen consumption. Pinching strength was reduced by OA; meanwhile self-righting was increased by OA and OW. At 20 degrees C, carbohydrate content was reduced significantly by OA. Regardless of temperature, a significant reduction in energy reserves in terms of protein content by OA was found. The ATP provisioning capacity was significantly affected by the interaction between temperature and pCO(2) and was highest at 15 degrees C and present day pCO(2) levels. The HSP70 levels of crabs exposed to OW were higher than in the control crabs. We conclude that OAand OWmight affect the amount and size of prey consumed by this crab. Therefore, by reducing the crab feeding performance these stressors might pose limits on their role in generating microhabitat for other rocky intertidal species inhabiting within mussel beds. (C) 2020 Elsevier B.V. All rights reserved.

Item ID: 66097
Item Type: Article (Research - C1)
ISSN: 0048-9697
Keywords: Global change biology, Pinching strength, Self-righting, Metabolic rate, Nutritional status, Acanthocyclus hassleri
Copyright Information: © 2020 Elsevier B.V. All rights reserved.
Funders: Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)
Projects and Grants: FONDECYT grant no. 1181609
Date Deposited: 17 Feb 2021 18:17
FoR Codes: 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310305 Marine and estuarine ecology (incl. marine ichthyology) @ 30%
31 BIOLOGICAL SCIENCES > 3199 Other biological sciences > 319902 Global change biology @ 40%
31 BIOLOGICAL SCIENCES > 3109 Zoology > 310913 Invertebrate biology @ 30%
SEO Codes: 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280102 Expanding knowledge in the biological sciences @ 30%
18 ENVIRONMENTAL MANAGEMENT > 1805 Marine systems and management > 180501 Assessment and management of benthic marine ecosystems @ 30%
19 ENVIRONMENTAL POLICY, CLIMATE CHANGE AND NATURAL HAZARDS > 1905 Understanding climate change > 190507 Global effects of climate change (excl. Australia, New Zealand, Antarctica and the South Pacific) (excl. social impacts) @ 40%
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