Impact of coral spawning on the biogeochemistry of a Hawaiian reef

We examined the impact of Montipora capitata coral spawning on local biogeochemistry in Kane'ohe Bay, Hawai'i. This event supplied labile, spawn-derived organic matter (SDOM) to the water column, triggering a cascading series of related effects on the biogeochemistry of the reef. Specifica...

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Bibliographic Details
Published in:Estuarine, coastal and shelf science coastal and shelf science, 2013-12, Vol.134, p.57-68
Main Authors: Briggs, R.A., Padilla-Gamiño, J.L., Bidigare, R.R., Gates, R.D., Ruttenberg, K.C.
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
biogeochemistry
Biological and medical sciences
Brackish water ecosystems
Cnidaria. Ctenaria
coral
Fundamental and applied biological sciences. Psychology
General aspects
Invertebrates
Montipora capitata
nutrients
spawning
Synecology
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Summary:We examined the impact of Montipora capitata coral spawning on local biogeochemistry in Kane'ohe Bay, Hawai'i. This event supplied labile, spawn-derived organic matter (SDOM) to the water column, triggering a cascading series of related effects on the biogeochemistry of the reef. Specifically, we measured the isotopic composition and nutrient ratios of spawning material and coral tissues, and utilized these signatures to track pathways of SDOM incorporation into this coral-dominated ecosystem. We observed: (1) shifts in the isotopic signatures of coral tissues after the spawning event, (2) rapid turnover of SDOM within the water column and enhanced deposition of POM to the sediment surface, (3) enhanced sediment efflux of NH4+ after the spawning event that triggered a phytoplankton bloom in the overlying water, and (4) drawdown of dissolved nutrients in the water column after spawning that coincided with the occurrence of a water column phytoplankton bloom. Our results show that single-species spawning events can serve as a source of substantial nutrient input to the water column, contributing in similar ways to storm-driven river nutrient input, and with measurable impact on the biogeochemistry of the reef.
ISSN:0272-7714
1096-0015
DOI:10.1016/j.ecss.2013.09.013