migration

Weed species (part 1)

This is the first in a series of essays titled, "Practical Evolution." Here are links to the whole series and the series introduction. I've decided to break the articles up into two parts, so that a full essay will appear in two successive weeks. So if you enjoy the current installment, by all means come back on Friday, when I will follow the threads of dispersal by way of an obnoxious animal pest right back to hominids.

Dandelion seeds

Popgen Ramblings:

What stops a species from extending its range indefinitely, why does a species not adapt and spread to every environment it encounters? This question has strong evolutionary and ecological importance, and it is not just an academic question as shown by the changing range of mosquitoes due to climate change.

...followed by a concise discussion of some explanations, with links to primary sources.

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DavidB at Gene Expression continues his wonderful series on Sewall Wright with a detailed post on the population genetics of migration.

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