Wednesday, January 16, 2013

Lab meeting Tuesday January 22nd: On the evidence for species coexistence: a critique

Posted by Maren Wellenreuther

Next week, we will discuss a paper by Adam Siepielski and Mark McPeek on the evidence for species coexistence. The paper was published in 2010 as part of the Concepts & Synthesis section in Ecology, which aims towards stimulating new research in ecology. In a  nutshell, the authors survey the literature for empirical studies of coexistence on a local scale and evaluate how many of these studies also actually test the underlying assumptions of species coexistence (such as invasibility). 

In addition, I would like to ask everybody to bring  either your favorite biology book or a biology/science book that you think might be of interest to somebody else in the EXEB group.  The idea is that we can get inspirations and ideas from each other, and maybe some healthy book swapping will result from it. 

Time and place as usual: Argumentet (2nd floor, Ecology Building) at 10.30

I will bring fika! 


Below is the abstract of the paper that we will discuss.

Siepielski, Adam M., and Mark A. McPeek. 2010. On the evidence for species coexistence: a critique of the coexistence program. Ecology 91:3153–3164. 
A major challenge in ecology is to understand how the millions of species on Earth are organized into biological communities. Mechanisms promoting coexistence are one such class of organizing processes, which allow multiple species to persist in the same trophic level of a given web of species interactions. If some mechanism promotes the coexistence of two or more species, each species must be able to increase when it is rare and the others are at their typical abundances; this invasibility criterion is fundamental evidence for species coexistence regardless of the mechanism. In an attempt to evaluate the level of empirical support for coexistence mechanisms in nature, we surveyed the literature for empirical studies of coexistence at a local scale (i.e., species found living together in one place) to determine whether these studies satisfied the invasibility criterion. In our survey, only seven of 323 studies that drew conclusions about species coexistence evaluated invasibility in some way in either observational or experimental studies. In addition, only three other studies evaluated necessary but not sufficient conditions for invasibility (i.e., negative density dependence and a trade-off in performance that influences population regulation). These results indicate that, while species coexistence is a prevalent assumption for why species are able to live together in one place, critical empirical tests of this fundamental assumption of community structure are rarely performed. These tests are central to developing a more robust understanding of the relative contributions of both deterministic and stochastic processes structuring biological communities

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