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Ultrastructural biomarkers in symbiotic algae reflect the availability of dissolved inorganic nutrients and particulate food to the reef coral holobiont

Ultrastructural biomarkers in symbiotic algae reflect the availability of dissolved inorganic nutrients and particulate food to the reef coral holobiont
Ultrastructural biomarkers in symbiotic algae reflect the availability of dissolved inorganic nutrients and particulate food to the reef coral holobiont
Reef building corals associated with symbiotic algae (zooxanthellae) can access environmental nutrients from different sources, most significantly via the uptake of dissolved inorganic nutrients by the algal symbiont and heterotrophic feeding of the coral host. Climate change is expected to alter the nutrient environment in coral reefs with the potential to benefit or disturb coral reef resilience. At present, the relative importance of the two major nutrient sources is not well understood, making predictions of the responses of corals to changes in their nutrient environment difficult. Therefore, we have examined the long-term effects of the availability of different concentrations of dissolved inorganic nutrients and of nutrients in particulate organic form on the model coral Euphyllia paradivisa. Coral and algal biomass showed a significantly stronger increase in response to elevated levels of dissolved inorganic nutrients as compared to the supply with particulate food. Also, changes in the zooxanthellae ultrastructure, determined by transmission electron microscopy (TEM), were mostly driven by the availability of dissolved inorganic nutrients under the present experimental conditions. The larger size of symbiont cells, their increased accumulation of lipid bodies, a higher number of starch granules and the fragmentation of their accumulation body could be established as reliable biomarkers of low availability of dissolved inorganic nutrients to the coral holobiont.
2296-7745
Wiedenmann, Joerg
ad445af2-680f-4927-90b3-589ac9d538f7
D'angelo, Maria
0d35b03b-684d-43aa-a57a-87212ab07ee1
Rosset, Sabrina
22555676-237a-498b-8252-c8c7cb9dca08
Wiedenmann, Joerg
ad445af2-680f-4927-90b3-589ac9d538f7
D'angelo, Maria
0d35b03b-684d-43aa-a57a-87212ab07ee1
Rosset, Sabrina
22555676-237a-498b-8252-c8c7cb9dca08

Wiedenmann, Joerg, D'angelo, Maria and Rosset, Sabrina (2015) Ultrastructural biomarkers in symbiotic algae reflect the availability of dissolved inorganic nutrients and particulate food to the reef coral holobiont. Frontiers in Marine Science, 2. (doi:10.3389/fmars.2015.00103).

Record type: Article

Abstract

Reef building corals associated with symbiotic algae (zooxanthellae) can access environmental nutrients from different sources, most significantly via the uptake of dissolved inorganic nutrients by the algal symbiont and heterotrophic feeding of the coral host. Climate change is expected to alter the nutrient environment in coral reefs with the potential to benefit or disturb coral reef resilience. At present, the relative importance of the two major nutrient sources is not well understood, making predictions of the responses of corals to changes in their nutrient environment difficult. Therefore, we have examined the long-term effects of the availability of different concentrations of dissolved inorganic nutrients and of nutrients in particulate organic form on the model coral Euphyllia paradivisa. Coral and algal biomass showed a significantly stronger increase in response to elevated levels of dissolved inorganic nutrients as compared to the supply with particulate food. Also, changes in the zooxanthellae ultrastructure, determined by transmission electron microscopy (TEM), were mostly driven by the availability of dissolved inorganic nutrients under the present experimental conditions. The larger size of symbiont cells, their increased accumulation of lipid bodies, a higher number of starch granules and the fragmentation of their accumulation body could be established as reliable biomarkers of low availability of dissolved inorganic nutrients to the coral holobiont.

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Accepted/In Press date: 9 November 2015
Published date: 26 November 2015
Organisations: Ocean and Earth Science, Marine Biology & Ecology

Identifiers

Local EPrints ID: 407926
URI: https://eprints.soton.ac.uk/id/eprint/407926
ISSN: 2296-7745
PURE UUID: feaf8c3d-f99b-4a5b-a26e-1f92e399b164
ORCID for Joerg Wiedenmann: ORCID iD orcid.org/0000-0003-2128-2943

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Date deposited: 29 Apr 2017 01:02
Last modified: 20 Jul 2019 00:52

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