Resilience and resistance of a lake phosphorus cycle before and after food web manipulation
Article Abstract:
Ecosystem resilience and resistance for the phosphorus cycle in a lake ecosystem before and after manipulation of the food chain were compared in Tuesday Lake in Wisconsin. The lake shifted from a three to four trophic level food web during the period of the study, enabling resilience and resistance comparisons under the same physical-chemical conditions. Among the findings were that the turnover rate of a limiting nutrient, in this case phosphorus, is directly related to resilience. Another finding was that longer food chains are less resilient.
Publication Name: The American Naturalist
Subject: Earth sciences
ISSN: 0003-0147
Year: 1992
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Nutrient element limitation of zooplankton production
Article Abstract:
The results of a regional survey of 47 lakes in Norway and other recent data and models were examined to test the hypothesis that dominant zooplankton grazers such as Daphnia species approach a direct nutrient limitation. The results showed that variability in zooplankton biomass was strongly correlated with particulate phosphorus, but was not significantly correlated with independent variables such as phytoplankton biomass and chlorophyll. The results prove that zooplankton grazers suffer a direct nutrient limitation in many lakes.
Publication Name: The American Naturalist
Subject: Earth sciences
ISSN: 0003-0147
Year: 1992
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Effect of increased productivity on the abundances of trophic levels
Article Abstract:
A study was conducted to examine the effect of increased biological productivity on trophic level abundances. Earlier research shows that increased nutrient input to the lowest trophic levels raises abundance in the highest trophic level while having no effect on others. These conditions are affected by the presence of heterogenous food chains among various trophic levels.
Publication Name: The American Naturalist
Subject: Earth sciences
ISSN: 0003-0147
Year: 1993
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