Disturbance alters habitat isolation's effect on biodiversity in aquatic microcosm

Article Abstract:

The hypothesis that the effects of habitat isolation on patterns of regional level species richness may depend at least in part on the level of disturbances those habitats receive was tested in a microcosms experiment using an aquatic community consisting of protists and rotifers. It was found that in disturbed regions, regional species richness was lower in regions with isolated patches compared to regions where patches were experimentally connected by dispersal.

United States, Environmental aspects, Biological diversity, Biodiversity, Microcosm and macrocosm

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Strong and weak trophic cascades along a productivity gradient

Article Abstract:

The variability of prey species in benthic pond food webs in their susceptibility to predators is examined. The findings reveal that predator effects were strong and cascaded to plants in a low productivity pond and in an intermediate productivity pond dominated by larger herbivores.

Study and teaching, Predatory animals, Herbivores, Plant-animal interactions

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Scale-dependent indirect interactions between two prey species through a shared predator

Article Abstract:

The potential for indirect interactions between two prey species, pea aphids (Acyrthosiphon pisum) and potato leafhoppers (Empoasca fabae), through a shared predator (Nabis spp.) is investigated. The indirect interactions between prey species depend upon spatial scale.

Analysis, Predation (Biology), Pea aphid, Leafhoppers

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