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- W2155182458 abstract "Enchytraeids are regarded as keystone soil organisms in forest ecosystems. Their abundance and biomass fluctuate widely. Predicting the consequences of anthropogenic disturbances requires an understanding of the mechanisms underlying enchytraeid population dynamics. Here I develop a simple model, which predicts that the type of dynamics is controlled by resource input rate. If fungal resource input is a discrete event once a year, an exponential growth phase is followed by starvation and sharp decline of enchytraeid abundance. Model simulations with three different forcing functions were compared to field data. Initial parameter values were obtained from various independent sources, and parameters were estimated by minimizing the residual sum of squares. The best fitting model with resource addition once a year explained 39% of the variation in enchytraeid biomass over an 8-year study period. Further, variation in rainfall explained 59% of the variation in R2 of the exponential phase models, which is also an index of the stability of population size-structure. The results emphasize the importance of resource limitation for enchytraeid population dynamics and support the hypothesis that the mortality during the decline phase is size-dependent." @default.
- W2155182458 created "2016-06-24" @default.
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- W2155182458 date "2009-06-01" @default.
- W2155182458 modified "2023-09-25" @default.
- W2155182458 title "Enchytraeid population dynamics: Resource limitation and size-dependent mortality" @default.
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- W2155182458 doi "https://doi.org/10.1016/j.ecolmodel.2009.03.013" @default.
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