Spatial and temporal variation in fecundity of Acropora spp. in the Northern Great Barrier Reef

Pratchett, Morgan S., Hoey, Andrew S., Tan, Chun-Hong, Kuo, Chao-Yang, Bauman, Andrew G., Kumaraswamy, Rajani, and Baird, Andrew H. (2019) Spatial and temporal variation in fecundity of Acropora spp. in the Northern Great Barrier Reef. Diversity, 11. 60.

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Abstract

The amount of energy invested in sexual reproduction by scleractinian corals depends on their life history strategies (i.e., allocation of energy between growth, reproduction, and maintenance). However, energy allocated to reproduction will also be affected by the amount of energy acquired and prevailing environmental conditions. Coral fecundity is therefore likely to vary spatially, especially along marked gradients in environmental conditions. One of the foremost gradients in reef structure and environmental conditions occurs with distance from the coast, whereby inner-shelf or near shore reefs are generally subject to higher levels of nutrients, sediments and pollutants, which often adversely affect reef-building corals. This study quantified fecundity (oocytes per polyp) for three species, Acropora nasuta, A. spathulata, and A. hyacinthus, at six locations in the northern Great Barrier Reef (GBR), encompassing inner-, mid- and outer-shelf reefs. Replicate colonies were sampled at each location prior to the predicted date of spawning in 2013 and 2014. Both shelf position and year were important factors explaining variation in fecundity for each of the three coral species. Most notably, there were clear and consistent declines in the number of oocytes between 2013 and 2014, coinciding with the incidence of category 4 Cylone Ita in early 2014. Contrary to expectations, polyp-level fecundity was no lower (and in some cases substantially higher) on inner-shelf reefs, compared to conspecifics growing on mid-shelf or outer-shelf reefs. The observed patterns are much more complicated than anticipated, necessitating further research to understand differential population dynamics of corals on inner-shelf versus mid- and outer-shelf reefs

Item ID: 60343
Item Type: Article (Research - C1)
ISSN: 1424-2818
Keywords: coral reefs; gametogenesis; reproduction
Copyright Information: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Funders: Australian Research Council Centre of Excellence for Coral Reef Studies (ARC CECRS), Australian Research Council (ARC), Ambrose Monell Foundation
Projects and Grants: ARC CECRS CE14010002, ARC Discovery Early Career Researcher Award DE130100688
Date Deposited: 10 Sep 2019 02:18
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 100%
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