Download Ecological Niches: Linking Classical and Contemporary by Jonathan M. Chase PDF
By Jonathan M. Chase
Why do species dwell the place they dwell? What determines the abundance and variety of species in a given zone? What function do species play within the functioning of whole ecosystems? All of those questions percentage a unmarried center concept—the ecological area of interest. even supposing the area of interest notion has fallen into disfavor between ecologists lately, Jonathan M. Chase and Mathew A. Leibold argue that the area of interest is a perfect instrument with which to unify disparate study and theoretical techniques in modern ecology.Chase and Leibold outline the area of interest as together with either what an organism wishes from its surroundings and the way that organism's actions form its setting. Drawing at the idea of consumer-resource interactions, in addition to its graphical research, they increase a framework for knowing niches that's versatile sufficient to incorporate quite a few small- and large-scale tactics, from source festival, predation, and pressure to neighborhood constitution, biodiversity, and surroundings functionality. Chase and Leibold's man made process will curiosity ecologists from quite a lot of subdisciplines.
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Extra resources for Ecological Niches: Linking Classical and Contemporary Approaches (Interspecific Interactions)
Example text
Here, the species with the shallower-sloped ZNGI has a relatively stronger impact on the resource by which it is least limited (the resource on which it has a relatively lower R*). While in this scenario there is an equilibrium point so long as the ZNGIs intersect, that equilibrium will be an unstable saddle point. For now, we will primarily focus on the former revising the niche concept 35 case, where there is a stable equilibrium. We return in more detail to several types of biological complexities that could lead to unstable equilibria in chapter 5.
Revising the niche concept 41 A region consists of several localities, each of which has conditions that favor either existence or exclusion of one or both species. Species that cannot coexist locally could conceivably coexist regionally by existing in distinct local communities within the same region, and thus the criteria for regional coexistence are simpler than those at the local level (Leibold 1998). For both local and regional coexistence, criterion 1 above must always be met, as each species must be favored in at least one locality.
Because organisms respond to multiple factors, we next consider the interplay among such factors. Here we address the question of how to combine two environmental factors to see how they might interact. 1 for some examples). Rather than illustrate all possible combinations, we will focus on a handful of the betterstudied combinations, since these will also serve in later discussions. However, it is interesting to note that some combinations have received almost no attention whatsoever. For example, mutualisms have received very little attention using mechanistic models (but see Schwartz and Hoeksema 1998), though we suspect that it would be a relatively straightforward task to derive models similar to those discussed here.