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In the British Isles, oligophagous marine herbivores, particularly the ascoglossan (== sacoglossan) sea slug Elysia viridis, associate with the introduced green macroalga Codium fragile ssp. tomentosoides. Slugs prefer to associate with and consume the introduced C. fragile to the native C....
We compare two approaches to designing and analyzing monitoring studies to assess chronic, local environmental impacts. Intervention Analysis (IA) compares Before and After time series at an Impact site; a special case is Before––After, Control––Impact (BACI), using comparison sites as...
We compared the effects of habitat quality on dispersal, demography, dynamics, and fitness of prairie vole ( Microtus ochrogaster ) and meadow vole ( M. pennsylvanicus ) populations by manipulating habitat patches in experimental landscapes. Four habitat patches in each of four replicate...
Responses of zooplankton, pelagic primary producers, planktonic bacteria, and CO 2 exchange with the atmosphere were measured in four lakes with contrasting food webs under a range of nutrient enrichments during a seven-year period. Prior to enrichment, food webs were manipulated to create...
A simple food chain model of community structure was used to evaluate the roles of bottom-up and top-down factors in a rocky intertidal community. Predictions of the model were modified to incorporate known variation in the strength of species interactions and nutrient delivery rates along a...
A defining hypothesis of theoretical ecology during the past century has been that population fluctuations might largely be explained by relatively low-dimensional, nonlinear ecological interactions, provided such interactions could be correctly identified and modeled. The realization in recent...
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