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Habitat variability correlates with duplicate content of Drosophila genomes.

ABSTRACT: The factors limiting the habitat range of species are crucial in understanding their biodiversity and response to environmental change. Yet the genetic and genomic architectures that produce genetic variation to enable environmental adaptation have remained poorly understood. Here we show that the proportion of duplicated genes (P(D)) in the whole genomes of fully sequenced Drosophila species is significantly correlated with environmental variability within the habitats measured by the climatic envelope and habitat diversity. Furthermore, species with a low P(D) tend to lose the duplicated genes owing to their faster evolution. These results indicate that the rapid relaxation of functional constraints on duplicated genes resulted in a low P(D) for species with lower habitat diversity, and suggest that the maintenance of duplicated genes gives organisms an ecological advantage during evolution. We therefore propose that the P(D) in a genome is related to adaptation to environmental variation.

SUBMITTER: Makino T

PROVIDER: S-EPMC3457775 | biostudies-literature | 2012 Oct

REPOSITORIES: biostudies-literature

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Habitat variability correlates with duplicate content of Drosophila genomes.

Makino Takashi T Kawata Masakado M

Molecular biology and evolution 20120513 10

The factors limiting the habitat range of species are crucial in understanding their biodiversity and response to environmental change. Yet the genetic and genomic architectures that produce genetic variation to enable environmental adaptation have remained poorly understood. Here we show that the proportion of duplicated genes (P(D)) in the whole genomes of fully sequenced Drosophila species is significantly correlated with environmental variability within the habitats measured by the climatic ...[more]

PMID: 22586328

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Project description:While adult white sharks (Carcharodon carcharias) are apex predators with a circumglobal distribution, juvenile white sharks (JWS) feed primarily on bottom dwelling fishes and tend to be coastally associated. Despite the assumedly easier access to juveniles compared to large, migratory adults, limited information is available on the movements, environments, and distributions of individuals during this life stage. To quantify movement and understand their distribution in the southern California Bight, JWS were captured and fitted with dorsal fin-mounted satellite transmitters (SPOT tags; n = 18). Nine individuals crossed the U.S. border into Baja California, Mexico. Individuals used shallow habitats (134.96 ± 191.1 m) close to shore (7.16 ± 5.65 km). A generalized linear model with a binomial distribution was used to predict the presence of individuals based on several environmental predictors from these areas. Juveniles were found to select shallow habitats (< 1000 m deep) close to land (< 30 km of the shoreline) in waters ranging from 14 to 24°C. Southern California was found to be suitable eight months of the year, while coastal habitats in Baja California were suitable year-round. The model predicted seasonal movement with sharks moving from southern California to Baja California during winter. Additionally, habitat distribution changed inter-annually with sharks having a more northerly distribution during years with a higher Pacific Decadal Oscillation index, suggesting sharks may forego their annual fall migrations to Baja California, Mexico, during El Niño years. Model predictions aligned with fishery-dependent catch data, with a greater number of sharks being captured during periods and/or areas of increased habitat suitability. Thus, habitat models could be useful for predicting the presence of JWS in other areas, and can be used as a tool for potentially reducing fishery interactions during seasons and locations where there is increased susceptibility of incidental catch.

Dataset Information

Habitat variability correlates with duplicate content of Drosophila genomes.

Publications

Habitat variability correlates with duplicate content of Drosophila genomes.

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