Download e-book for iPad: Eco-Evolutionary Dynamics, Volume 50 by Jordi Moya-Laraño, Jennifer Rowntree, Guy Woodward

By Jordi Moya-Laraño, Jennifer Rowntree, Guy Woodward

The subject matter of this quantity is to debate Eco-evolutionary Dynamics.

  • Updates and informs the reader at the newest learn findings
  • Written through major specialists within the field
  • Highlights parts for destiny investigation

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Extra resources for Eco-Evolutionary Dynamics, Volume 50

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If guppy evolution were to be driven by their high population densities and their depletion of food resources, then the strength of this feedback should depend on the extent of resource depletion. Were this to be the case, then the intensity of this feedback should be greater and the rate of evolution of guppies should be higher under an intact canopy. Each stream has two types of control to provide a frame of reference for quantifying change. First, all streams have barriers that define the up- and downstream borders of the study site and hence the portion of stream occupied by the experimental population of guppies.

We found no evidence that exchanging phenotypes would change the indirect effects of guppies on algal biomass; in fact, the sign of the effect estimated from the data was negative, which is in the opposite direction from what a trophic or nutrient cascade would predict. Not only was the estimated change in the indirect effect not statistically significant, its magnitude was quite small. The failure to detect the effect as statistically significant did not seem likely to be caused by low statistical power; had our residual degrees of freedom for the statistical test gone from 25 (the actual value) to 3000, the F-statistic would have remained insignificant (assuming that a larger sample size would not have appreciably changed the residual variance).

4. 1 Experimental introductions of guppy populations Experiments in artificial streams characterize the ecological consequences of the end point of guppies adapting to life with or without predators, and also 26 Joseph Travis et al. of Rivulus adapting to life with or without guppies. Feedback between ecology and evolution is inferred from these results; for example, the evolution of the LP phenotype is suggestive of adaptation to high population densities. We also infer that the more general diet of LP guppies is an adaptation to their depletion of food availability.

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