Genetic Divergence across Habitats in the Widespread Coral Seriatopora hystrix and Its Associated Symbiodinium
Open Access
- 27 May 2010
- journal article
- research article
- Published by Public Library of Science (PLoS) in PLOS ONE
- Vol. 5 (5), e10871
- https://doi.org/10.1371/journal.pone.0010871
Abstract
Coral reefs are hotspots of biodiversity, yet processes of diversification in these ecosystems are poorly understood. The environmental heterogeneity of coral reef environments could be an important contributor to diversification, however, evidence supporting ecological speciation in corals is sparse. Here, we present data from a widespread coral species that reveals a strong association of host and symbiont lineages with specific habitats, consistent with distinct, sympatric gene pools that are maintained through ecologically-based selection. Populations of a common brooding coral, Seriatopora hystrix, were sampled from three adjacent reef habitats (spanning a ∼30 m depth range) at three locations on the Great Barrier Reef (n = 336). The populations were assessed for genetic structure using a combination of mitochondrial (putative control region) and nuclear (three microsatellites) markers for the coral host, and the ITS2 region of the ribosomal DNA for the algal symbionts (Symbiodinium). Our results show concordant genetic partitioning of both the coral host and its symbionts across the different habitats, independent of sampling location. This study demonstrates that coral populations and their associated symbionts can be highly structured across habitats on a single reef. Coral populations from adjacent habitats were found to be genetically isolated from each other, whereas genetic similarity was maintained across similar habitat types at different locations. The most parsimonious explanation for the observed genetic partitioning across habitats is that adaptation to the local environment has caused ecological divergence of distinct genetic groups within S. hystrix.Keywords
This publication has 77 references indexed in Scilit:
- Shape-shifting corals: Molecular markers show morphology is evolutionarily plastic in PoritesBMC Evolutionary Biology, 2009
- In situ photobiology of corals over large depth ranges: A multivariate analysis on the roles of environment, host, and algal symbiontLimnology and Oceanography, 2008
- Natural Disease Resistance in Threatened Staghorn CoralsPLOS ONE, 2008
- Genetic Traces of Recent Long-Distance Dispersal in a Predominantly Self-Recruiting CoralPLOS ONE, 2008
- Variation in symbiont distribution between closely related coral species over large depth rangesMolecular Ecology, 2007
- Genetic variation for shell traits in a direct-developing marine snail involved in a putative sympatric ecological speciation processEvolutionary Ecology, 2006
- Detecting the number of clusters of individuals using the software structure: a simulation studyMolecular Ecology, 2005
- An economic method for the fluorescent labeling of PCR fragmentsNature Biotechnology, 2000
- Non‐parametric multivariate analyses of changes in community structureAustralian Journal of Ecology, 1993
- Evolutionary trees from DNA sequences: A maximum likelihood approachJournal of Molecular Evolution, 1981