Long-term experimental evolution in the wild (Ep 106)

08/27/24 • 67 min

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Can we predict evolutionary outcomes if we know starting conditions? Do the products of evolution in nature differ from those studied in well-controlled lab experiments?

On this episode, we talk to Katie Peichel, head of the Division of Evolutionary Ecology at the University of Bern, Switzerland, and Andrew Hendry, professor in the Department of Biology at McGill University, Canada. Katie and Andrew are part of a massive research team working on the evolution of threespine sticklebacks as they are reintroduced into lakes in Alaska. Sticklebacks have been a favorite species for evolutionary biologists since almost the origins of modern evolutionary theory. Traits like spine size and lateral plate armor evolve rapidly when populations colonize new habitats, leading populations to barely resemble one another. Unlike traditional evolutionary experiments, which try to infer what occurred in the past, the Alaska project is tracking in unparalleled detail changes in the phenotypes and genotypes of fish that went into each lake population.

We talk to Katie and Andrew about the origins of this incredible project, the pros and cons of different approaches to studying evolution, and the need for long-term experimental studies of evolution in the wild. This is the first of a series of episodes we will be doing on the Alaskan research project, so stay tuned!

Cover art: Keating Shahmehri

Can we predict evolutionary outcomes if we know starting conditions? Do the products of evolution in nature differ from those studied in well-controlled lab experiments?

Cover art: Keating Shahmehri

Previous Episode

Stickle-back to the future: experimental evolution in nature (Ep 121)

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Can we study evolution in the wild? Are some species “super-evolvers”?

On the episode, we talk with Alison Derry, a professor of biology at the University of Quebec in Montreal, and Andrew Hendry, a professor in the Department of Biology at McGill University, Canada. This episode is the second we’ve done on the team’s work, and Andrew was also a guest on our first episode in the series. This conversation was recorded live in front of an audience at Kenai Peninsula College, in Soldotna, Alaska.

The college is just a few miles from the lakes where Alison, Andrew, and many of their colleagues and students carry out experiments on threespine sticklebacks. We ask Alison and Andrew about their research on the rapid evolution of these fish, which were recently reintroduced to the lakes, and how the introduction of two distinct stickleback ecotypes are affecting the evolution of zooplankton in the lakes. We also discuss the central position of sticklebacks in the food web and how the sticklebacks are impacting the ecosystems now as well as how they likely impacted the lakes in the evolutionary past.

Art by Keating Shahmehri. Audio from Hunter Morrison at KDLL. Find a transcript of this episode on our website.

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Ahead of the (thermal) curve (Ep 122)

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