Demographic history ofDiadema antillarum, a keystone herbivore on Caribbean reefs
Open Access
- 22 November 2001
- journal article
- Published by The Royal Society in Proceedings. Biological sciences
- Vol. 268 (1483), 2347-2353
- https://doi.org/10.1098/rspb.2001.1806
Abstract
The sea urchin Diadema antillarum was the most important herbivore on Caribbean reefs until 1983, when mass mortality reduced its populations by more than 97%. Knowledge of its past demography is essential to reconstruct reef ecology as it was before human impact, which has been implicated as having caused high pre–mortality Diadema abundance. To determine the history of its population size, we sequenced the ATPase 6 and 8 region of mitochondrial DNA from populations in the Caribbean and in the eastern Atlantic (which was not affected by the mass mortality), as well as from the eastern Pacific D. mexicanum. The Caribbean population harbours an order of magnitude more molecular diversity than those of the eastern Pacific or the eastern Atlantic and, despite the recent mass mortality, its DNA sequences bear the genetic signature of a previous population expansion. By estimating mutation rates from divergence between D. antillarum and D. mexicanum, that were separated at a known time by the Isthmus of Panama, and by using estimates of effective population size derived from mismatch distributions and a maximum likelihood coalescence algorithm, we date the expansion as having occurred no more recently than 100 000 years before the present. Thus, Diadema was abundant in the Caribbean long before humans could have affected ecological processes; the genetic data contain no evidence of a recent, anthropogenically caused, population increase.This publication has 58 references indexed in Scilit:
- Genetic Patterns Suggest Exponential Population Growth in a Declining SpeciesMolecular Biology and Evolution, 1996
- Diadema antillarum10 years after mass mortality: still rare, despite help from a competitorProceedings. Biological sciences, 1995
- Community Structure in Time Past: Influence of Human Fishing Pressure on Algal‐Urchin InteractionsEcology, 1992
- Estimating effective population size from samples of sequences: inefficiency of pairwise and segregating sites as compared to phylogenetic estimatesGenetics Research, 1992
- Skeletal changes in the test and jaws of the sea urchinDiadema antillarum in response to food limitationMarine Biology, 1991
- Increases in surgeonfish populations after mass mortality of the sea urchinDiadema antillarum in Panamá indicate food limitationMarine Biology, 1991
- Adaptive protein evolution at the Adh locus in DrosophilaNature, 1991
- MASS MORTALITY OF DIADEMA ANTILLARUM IN THE CARIBBEAN: What Have We Learned?Annual Review of Ecology and Systematics, 1988
- Damselfish Territoriality: Influence on Diadema Distribution and Implications for Coral Community StructureMarine Ecology Progress Series, 1982
- An Analysis of Competitive Interactions in a Patch Back‐Reef EnvironmentEcology, 1981