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▪ Abstract Lentic freshwater habitats in temperate regions exist along a gradient from small ephemeral ponds to large permanent lakes. This environmental continuum is a useful axis for understandingExpand
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Diversification on an ecologically constrained adaptive landscape.
We used phylogenetic analysis of body-size ecomorphs in a crustacean species complex to gain insight into how spatial complexity of ecological processes generates and maintains biological diversity.Expand
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Diet Composition in Postmetamorphic Bullfrogs and Green Frogs: Implications for Interspecific Predation and Competition
We examined diet composition of postmetamorphic bullfrogs (Rana catesbeiana) and green frogs (R. clamitans) co-occurring at two study sites in southwest Michigan to gain insight into the nature ofExpand
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Multiple origins of pyrethroid insecticide resistance across the species complex of a nontarget aquatic crustacean, Hyalella azteca
Significance The crustacean, Hyalella azteca, is commonly used in environmental monitoring to test the toxicity of water or sediment. We show that among three laboratory cultures and seven wildExpand
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Ecological opportunity and the adaptive diversification of lineages
The tenet that ecological opportunity drives adaptive diversification has been central to theories of speciation since Darwin, yet no widely accepted definition or mechanistic framework for theExpand
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Determinants of reproductive success in freshwater amphipod species that experience different mortality regimes
Selection on traits conferring enhanced mating success, and thus favoured through sexual selection, may be opposed by selection imposed by predators. This study compares determinants of reproductiveExpand
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Life history and allozyme diversification in regional ecomorphs of the Hyalella azteca (Crustacea: Amphipoda) species complex
In North America, several species in the freshwater amphipod genus Hyalella occur as one of two alternative phenotypic types, or ‘ecomorphs’, each possessing life history traits that allow success inExpand
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The Mechanistic Basis of Body Size Differences Between Two Hyalella (Amphipoda) Species
Abstract The mechanistic basis of differences in adult body size between two closely related freshwater amphipod species (Hyalella spp.) are investigated. The study populations, Duck Lake and GeorgeExpand
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The Toxicogenome of Hyalella azteca: A Model for Sediment Ecotoxicology and Evolutionary Toxicology.
Hyalella azteca is a cryptic species complex of epibenthic amphipods of interest to ecotoxicology and evolutionary biology. It is the primary crustacean used in North America for sediment toxicityExpand
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Ecological context and the importance of body and gnathopod size for pairing success in two amphipod ecomorphs
Ecological context generates interspecific variation in mating behavior by imposing differential constraints on the action of sexual selection, but operation of these constraints in nature is notExpand
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