Lab-meeting: talk about poison dart frogs, predator avoidance and colour polymorphism

 Poison dart frog (Dendrobates pumilo) in Costa Rica 2005 

(Photo: Erik Svensson)

Posted by Erik Svensson

 This coming lab-meeting next week, we will listen to an informal presentation on poison dart frogs and colour polymorphism by visiting student Beatriz Willink, who will soon hopefully join the EXEB-lab as a new PhD-student. Beatriz has done a three-years Master's in Costa Rica, and is an experienced field biologist. Some of Beatriz work has been published in Evolution, Evolutionary Ecology and Behavioural Ecology and Sociobology, and you can follow these links if you want to take a look at her papers.

The title of Beatriz talk is:

"Not everything is black and white: Multiple predators and predator-avoidance strategies in a polytypic poison frog"

 Time and place:

When: Tuesday, April  22, at 10.30
Where: "Darwin Room", 2nd floor, Ecology Building

Any fika volunteer?

On isopod antipredator adaptations in PLoS ONE

This week, Fabrice Eroukhmanoff and I have a paper about antipredator adaptations and phenotypic integration in the famous aquatic isopod (Asells aquaticus), the main study organism in Fabrice's Ph.D.-thesis work. The paper is published in the popular and fast growing "Open Acess"-journal PLoS ONE, which despite some initial skepticism, has rapidly emerged as a major scientific publisher.

I would encourage you to read this paper and if you have time and have registered as a user at PLoS, feell free to comment upon it. This is one of the major strength of publishing in PLoS-journals: the interactivity between readers and published articles.

Here is the abstract for those who are interested:

Fabrice Eroukhmanoff, Erik I. Svensson

Abstract

"It is increasingly being recognized that predation can be a strong diversifying agent promoting ecological divergence. Adaptations against different predatory regimes can emerge over short periods of time and include many different traits. We studied antipredator adaptations in two ecotypes of an isopod (Asellus aquaticus) that have, diverged in parallel in two Swedish lakes over the last two decades. We quantified differences in escape speed, morphology and behavior for isopods from different ecotypes present in these lakes. Isopods from the source habitat (reed) coexist with mainly invertebrate predators. They are more stream-profiled and have higher escape speeds than isopods in the newly colonized stonewort habitat, which has higher density of fish predators. Stonewort isopods also show more cautious behaviors and had higher levels of phenotypic integration between coloration and morphological traits than the reed isopods. Colonization of a novel habitat with a different predation regime has thus strengthened the correlations between pigmentation and morphology and weakened escape performance. The strong signature of parallelism for these phenotypic traits indicates that divergence is likely to be adaptive and is likely to have been driven by differences in predatory regimes. Furthermore, our results indicate that physical performance, behavior and morphology can change rapidly and in concert as new habitats are colonized."