Influence of local habitat on the physiological responses of large benthic foraminifera to temperature and nutrient stress

Prazeres, Martina, Uthike, Sven, and Pandolfi, John M. (2016) Influence of local habitat on the physiological responses of large benthic foraminifera to temperature and nutrient stress. Scientific Reports, 6. pp. 1-12.

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Abstract

Large benthic foraminifera (LBF) are important for reef sediment formation, but sensitive to elevated temperature and nutrients. However, it is possible that conspecific foraminifera living in different reef sites present divergent response to environmental shifts. We investigated how populations of Amphistegina lobifera from reef sites located along a temperature and nutrient gradient of the northern Great Barrier Reef respond and acclimate to elevated temperature and nitrate under lab-controlled conditions. Generalized linear mixed models showed that interaction between reef sites and temperature or nitrate conditions had a significant effect on survivorship, bleaching frequency and growth rates of A. lobifera. Further physiological analyses of antioxidant capacity and Ca-ATPase activity showed that populations collected from the inner-shelf sites (highest nutrient levels, largest temperature variation) were consistently able to acclimate to both parameters after 30 days. In contrast, foraminifera collected from the reef sites located in the mid- and outer-shelfs were significantly more sensitive to elevated temperatures and nitrate. Our results highlight the importance of local habitat in shaping the tolerance of LBF to changing environmental conditions; populations that live in stable environments are more sensitive to elevated temperature and nitrate, even within their fundamental tolerance range, than those that experience fluctuating conditions.

Item ID: 49330
Item Type: Article (Research - C1)
ISSN: 2045-2322
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This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

Funders: ARC Centre of Excellence for Coral Reef Studies (CECRS), National Environmental Research Program (NERP), Ian Potter Foundation (IPF), Cushman Foundation for Foraminiferal Research (CFFR)
Projects and Grants: CFFR Loeblich and Tappan Student award
Date Deposited: 12 Jun 2017 01:52
FoR Codes: 06 BIOLOGICAL SCIENCES > 0606 Physiology > 060601 Animal Physiology - Biophysics @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
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