NDLI: Can benthic algae mediate larval behavior and settlement of the coral Acropora muricata?

Content Provider	Springer Nature Link
Author	Denis, V. Loubeyres, M. Doo, S. S. Palmas, S. Keshavmurthy, S. Hsieh, H. J. Chen, C. A.
Copyright Year	2014
Abstract	The resilience of coral reefs relies significantly on the ability of corals to recover successfully in algal-dominated environments. Larval settlement is a critical but highly vulnerable stage in the early life history of corals. In this study, we analyzed how the presence of two upright fleshy algae, Sargassum mcclurei (SM) and Padina australis (PA), and one crustose coralline algae, Mesophyllum simulans (MS), affects the settlement of Acropora muricata larvae. Coral larvae were exposed to seawater flowing over these algae at two concentrations. Larval settlement and mortality were assessed daily through four variables related to their behavior: swimming, substratum testing, metamorphosis, and stresses. Temperature, dissolved oxygen, pH, algal growth, and photosynthetic efficiency were monitored throughout the experiment. Results showed that A. muricata larvae can settle successfully in the absence of external stimuli (63 ± 6 % of the larvae settled in control treatments). While algae such as MS may stimulate substrate testing and settlement of larvae in the first day after competency, they ultimately had a lower settlement rate than controls. Fleshy algae such as PA, and in a lesser measure SM, induced more metamorphosis than controls and seemed to eventually stimulate settlement. A diverse combination of signals and/or modifications of microenvironments by algae and their associated microbial communities may explain the pattern observed in coral settlement. Overall, this study contributes significantly to the knowledge of the interaction between coral and algae, which is critical for the resilience of the reefs.
Starting Page	431
Ending Page	440
Page Count	10
File Format	PDF
ISSN	07224028
Journal	Coral Reefs
Volume Number	33
Issue Number	2
e-ISSN	14320975
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-02-07
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mesophyllum Padina Sargassum Coral larvae Coral–algal interactions Reef recovery Freshwater & Marine Ecology Oceanography
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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