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Spatial and Temporal Variation in Fecundity of Acropora spp. in the Northern Great Barrier Reef

1
ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4811, Australia
2
School of Marine and Environmental Sciences, Universiti Malaysia Terengganu, Kuala Nerus 21030, Terengganu, Malaysia
3
Biodiversity Research Center, Academia Sinica, Nangang, Taipei 115, Taiwan
4
Experimental Marine Ecology Laboratory, Department of Biological Sciences, National University of Singapore, Singapore 117543, Singapore
5
Summer Research Program for Science Teachers, Columbia University, New York, NY 10032, USA
*
Author to whom correspondence should be addressed.
Diversity 2019, 11(4), 60; https://doi.org/10.3390/d11040060
Received: 21 January 2019 / Revised: 4 April 2019 / Accepted: 9 April 2019 / Published: 16 April 2019
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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. View Full-Text
Keywords: coral reefs; gametogenesis; reproduction coral reefs; gametogenesis; reproduction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Pratchett, M.S.; Hoey, A.S.; Tan, C.-H.; Kuo, C.-Y.; Bauman, A.G.; Kumaraswamy, R.; Baird, A.H. Spatial and Temporal Variation in Fecundity of Acropora spp. in the Northern Great Barrier Reef. Diversity 2019, 11, 60.

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