By Herman A. Verhoef, Peter J. Morin
Nice source for graduate scholars and researchers. presents an exceptional heritage within the present realizing and uncertainty surrounding group ecology.
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Extra resources for Community Ecology: Processes, Models, and Applications
In order to understand, predict and mitigate such reorganizations, which can severely affect ecosystem services (Daily 1997) that humans depend on such as water supply and puriﬁcation and crop pollination, researchers need to broaden their focus from particular types of species to whole ecosystems. Ecological network research provides a very compelling framework for addressing the complexity of species interactions with each other and the environment. For example, the effects of any stressor – abiotic or biotic, natural or anthropogenic – on one population can cascade through ecological networks as a result of direct and indirect interactions, potentially affecting any other population in the same ecosystem.
2008). Such studies are expected to mostly show dynamics that arise from the internal structure of food webs, and have been performed with both small modules and more complex webs. Other studies have explored the dynamics of interacting species populations under ﬁeld conditions, which allows the assessment of the importance of external forcing factors. However, there is a necessary tradeoff here. 3 Internal dynamics in food web modules or simple webs In theory, consumer–resource interactions consist of two trophic levels that can ﬂuctuate for a long time, but can also lead to unstable dynamics, with the precise type of dynamics depending on model formulation (Fig.
They examined food chain development after experimentally reducing productivity over 2 orders of magnitude, a reduction that should result in the loss of at least one trophic level from the top of the food chain. Decreasing productivity reduced the number of coexisting species, the number of trophic links and maximum food chain length. There seemed to be clear evidence that energy played a role in limiting food chain length in this system. Kaunzinger and Morin (1998) used a simple microbial system to test for effects of productivity on food chain length.