Infographic: Watching Evolution in Real Time

Guppies transplanted between different communities in Trinidadian streams evolved in response to changes in predation threat in just a few generations.

By | May 1, 2017

© MESA SCHUMACHER

Contemporary evolution, or rapid genetic changes within populations, is ubiquitous, but one of the earliest demonstrations of natural selection’s short-term dynamics was observed in the streams of Trinidad. Starting in the early 1980s, researchers transferred guppies from communities with cichlid predators to bodies of water with only smaller predators called killifish, which eat only small, young guppies. The guppies in the new, low-predation environment grew larger and reproduced later than guppies that lived in cichlid-infested waters. Females also began having fewer, but larger young, and the intervals between their litters got longer. Over the long term, killifish evolved to be smaller and less abundant. Laboratory experiments confirmed that changes were hard-wired and heritable.© MESA SCHUMACHER

© MESA SCHUMACHER

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As the guppies became more abundant in the low-predation habitat, they faced more competition. It turns out that high guppy densities—and the subsequent depletion of resources—is the main driver of guppy evolution, not the higher probability of survival in the low-predation communities (Reznick et al., in review). Moreover, as the guppies evolved, they further influenced the environment, affecting not only individuals in their own population, but all the other organisms in the community, which were also evolving.

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Avatar of: Paul Stein

Paul Stein

Posts: 224

May 12, 2017

The main argument people who do not accept evolution would put forth is that nothing "evolved" here, in that, the fish didn't turn into anything other than the fish they already were...like into salamander-thingies.

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