Occupancy and environmental responses of habitat specialists and generalists depend on dispersal traits

Ecologists have been interested in understanding communities through the lens of specialists and generalists to predict species diversity and distribution patterns and to ameliorate worldwide declines in specialist species. Dispersal traits are assumed to be associated with specialization (specialis...

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Bibliographic Details
Published in:Ecosphere (Washington, D.C) D.C), 2018-03, Vol.9 (3), p.n/a
Main Author: Kneitel, Jamie M.
Format: Article
Language:English
Subjects:
active dispersal
Aquatic ecosystems
California vernal pools
Climate change
Coefficient of variation
Dispersal
Distribution patterns
Endemic species
Habitats
Heterogeneity
Invertebrates
Landscape
latitudinal gradient
passive dispersal
Specialization
Species diversity
Taxa
Taxonomy
temporary ponds
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Summary:Ecologists have been interested in understanding communities through the lens of specialists and generalists to predict species diversity and distribution patterns and to ameliorate worldwide declines in specialist species. Dispersal traits are assumed to be associated with specialization (specialists are weaker dispersers than generalists), but dispersal modes can be variable within groups. Niche‐based predictions of occupancy and environmental responses were assessed using invertebrates from California vernal pools that were categorized by specialization (endemic or widespread taxa) and dispersal mode (passive or active dispersal). Data from a latitudinal gradient resulted in widespread taxa with greater percent occupancy than endemic taxa as predicted, but passive dispersers had greater occupancy than active dispersers in contrast to predictions. Endemic species and widespread‐active dispersers exhibited similar levels of specialization measured as coefficient of variation among treatments in a mesocosm experiment. This suggested that habitat choice was important, and these differences in specialization were scale dependent (generalists across habitat types and specialists within a habitat type). A negative correlation between latitudinal occupancy and level of specialization demonstrated how local‐scale responses and landscape patterns were related and depend on both specialization and dispersal traits. This study underscores how habitat heterogeneity and species traits, including specialization and dispersal, can interact to affect community patterns at different spatial scales.
ISSN:2150-8925
2150-8925
DOI:10.1002/ecs2.2143