Richard S. Stemberger
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View article: Accumulation of heavy metals in food web components across a gradient of lakes
Accumulation of heavy metals in food web components across a gradient of lakes Open
Recent studies have emphasized the need for understanding the accumulation and fate of metal contaminants at different trophic levels and across a broad spectrum of lake types. To address both issues, metal concentrations (Hg, Zn, Cd, As, …
View article: Climatic forcing on zooplankton richness in lakes of the northeastern United States
Climatic forcing on zooplankton richness in lakes of the northeastern United States Open
The June 1991 eruption of Mt. Pinatubo had a marked cooling on global climate that was evident in the regional air temperatures of the northeastern U.S. This climatic perturbation coincided with the 1991–1994 pilot surveys initiated by the…
View article: Ultraviolet radiation in North American lakes: Attenuation estimates from DOC measurements and implications for plankton communities
Ultraviolet radiation in North American lakes: Attenuation estimates from DOC measurements and implications for plankton communities Open
Climate warming in North America is likely to be accompanied by changes in other environmental stresses such as UV‐B radiation. We apply an empirical model to available DOC (dissolved organic C) data to estimate the depths to which 1% of s…
View article: Reproductive costs and hydrodynamic benefits of chemically induced defenses in <i>Keratella testudo</i>
Reproductive costs and hydrodynamic benefits of chemically induced defenses in <i>Keratella testudo</i> Open
Food concentration differentially affected reproductive rates and hydrodynamic characteristics of spined and unspined phenotypes of the polymorphic rotifer Keratella testudo. The intrinsic rate of population growth (0.15 d −1 ) of the pred…
View article: <i>Asplanchna</i>‐induced polymorphism in the rotifer <i>Keratella slacki</i>1
<i>Asplanchna</i>‐induced polymorphism in the rotifer <i>Keratella slacki</i>1 Open
Asplanchna releases into its environment a filterable factor which induces eggs of Keratella slacki to develop into individuals with slightly larger (≈ 15%) bodies, considerably longer (≈ 30%) anterior spines, much longer (≈ 130%) right po…
View article: Environmental variables affecting small‐scale distributions of five rotifer species in Lancaster Lake, Michigan
Environmental variables affecting small‐scale distributions of five rotifer species in Lancaster Lake, Michigan Open
The small‐scale distributions of the rotifers Polyarthra vulgaris, Synchaeta stylata, Conochilus unicornis, Hexarthra mira , and Asplanchna priodonta were investigated in Lancaster Lake, Cheboygan County, Michigan, July 21, 1974. Measureme…