Download Anolis Lizards of the Caribbean: Ecology, Evolution, and by Jonathan Roughgarden PDF

By Jonathan Roughgarden

The Anolis lizards of the Caribbean are very best for the learn of evolutionary ecology. providing attention-grabbing insights into the greater than one hundred fifty species dispersed through the Caribbean islands, Jonathan Roughgarden information the diversities among species in a variety of behavioral and actual features, together with foraging behaviors, physique measurement, and habitat use, due to evolutionary divergences concurrent with the plate-tectonic origins of the sector. This ebook may be of curiosity to scholars and researchers--ecology and theoretical, tropical, and inhabitants biology.

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Extra info for Anolis Lizards of the Caribbean: Ecology, Evolution, and Plate Tectonics (Oxford Series in Ecology and Evolution)

Example text

The term involving the prey energy content, e\ , should now be multiplied by F1(r1) to indicate the fraction of chases that are successful. The terms for the time and energy involved in waiting and pursuit remain unchanged. But now the plot thickens. Setting the derivative of E/T with respect to r\ equal to 0 yields an equation that cannot be solved explicitly, and we must proceed numerically. A well-known technique for obtaining roots to a nonlinear equation is called the Newton-Raphson method, and it works as follows.

9. So, once again we have discovered a zoologically plausible behavioral rule for the lizard to follow. Following this behavioral rule of thumb leads the lizard to forage optimally. In a nutshell, here's how the illustration worked. 0 m away, and by assumption the lizard chased the first prey it saw regardless of where it was. 28. 2 m. The lizard evaluated the two possibilities: ignoring the prey versus chasing the prey, and it did whichever of these would produce the higher E/T. 31. 30. However, its E/T would have dropped even more had the prey been ignored.

Because the time per item is the sum of the waiting time and pursuit time, the number of items oursued during T is To find the total number of items captured, we need to multiply the above expression by the fraction of pursuits that is successful, F\(r\): This formula works out to 853 insects per 12 h of continuous optimal foraging for a 50-mm lizard with 2-mm prey having an abundance of 480 insects per m2 per 12 h. This daily catch amounts to slightly more than one insect caught per minute, an estimate off by an order of magnitude or more.

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