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Competitive interactions moderate the effects of elevated temperature and atmospheric CO2 on the health and functioning of oysters

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posted on 2023-07-26, 14:13 authored by Dannielle S. Green, Hazel Christie, Nicola Pratt, Bas Boots, Jasmin Godbold, Martin Solan, Chris Hauton
Global increases in sea temperatures and atmospheric concentrations of CO2 may affect the health of calcifying shellfish. Little is known, however, about how competitive inter actions within and between species may influence how species respond to multiple stressors. We experimentally assessed separate and combined effects of temperature (12 or 16°C) and atmospheric CO2 concentrations (400 and 1000 ppm) on the health and biological functioning of native (Ostrea edulis) and invasive (Crassostrea gigas) oysters held alone and in intraspecific or inter specific mixtures. We found evidence of reduced phagocytosis under elevated CO2 and, when combined with increased temperature, a reduction in the number of circulating haemocytes. Generally, C. gigas showed lower respiration rates relative to O. edulis when the species were in intraspecific or interspecific mixtures. In contrast, O. edulis showed a higher respiration rate relative to C. gigas when held in an interspecific mixture and exhibited lower clearance rates when held in intraspecific or interspecific mixtures. Overall, clearance rates of C. gigas were consistently greater than those of O. edulis. Collectively, our findings indicate that a species’ ability to adapt metabolic processes to environmental conditions can be modified by biotic context and may make some species (here, C. gigas) competitively superior and less vulnerable to future climatic scenarios at local scales. If these conclusions are generic, the relative role of species interactions, and other biotic parameters, in altering the outcomes of climate change will require much greater research emphasis.

History

Refereed

  • Yes

Volume

582

Page range

93-103

Publication title

Marine Ecology Progress Series

ISSN

1616-1599

Publisher

Inter Research

File version

  • Published version

Language

  • eng

Legacy posted date

2017-11-27

Legacy creation date

2017-11-22

Legacy Faculty/School/Department

ARCHIVED Faculty of Science & Technology (until September 2018)

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