3 years ago

Plasticity of boldness: high perceived risk eliminates a relationship between boldness and body size in fathead minnows

Denis Meuthen, Maud C.o. Ferrari, Taylor Lane, Douglas P. Chivers

Publication date: January 2019

Source: Animal Behaviour, Volume 147

Author(s): Denis Meuthen, Maud C.O. Ferrari, Taylor Lane, Douglas P. Chivers

In the face of anthropogenic change, we require a better understanding of how adaptive behavioural changes emerge from the interaction between personality and phenotypic plasticity, to be able to predict population persistence. Predation is an important context where this interaction occurs. Sampling wild fish populations revealed that boldness is size dependent in habitats with low predation risk but not in high predation habitats. This is predicted to occur due to a trade-off between a prey's metabolic demand, as per the metabolic hypothesis (smaller fish have higher metabolic requirements and thus need to be bolder) and their risk of predation, as per the predation risk hypothesis (smaller fish are subject to higher predation risk and should thus be shyer). However, since selective predation on specific individuals, age effects or the extent of direct experience with predators were not controlled for in these studies, the role of body size in modulating boldness remains unclear. Here, we tested the relationship between body size, boldness and predation risk in a widespread North American prey fish, the fathead minnow, Pimephales promelas. From hatching onwards, we manipulated perceived risk by exposing minnows to either conspecific alarm cues (indicative of predation risk) or distilled water in a split-clutch design. When fish were 4 months old, we measured body size and determined boldness using an emergence assay. Different levels of perceived predation risk did not directly affect body size or general boldness in fathead minnows. However, as predicted by the metabolic and predation risk hypotheses, high perceived predation risk cancelled out the negative correlation between boldness and body size present in controls through phenotypic plasticity. This effect was independent of selective predation, direct experience with predators and age. By adjusting personality through phenotypic plasticity, perceived predation risk alone may thus be sufficient for individuals to maximize their fitness in high-risk habitats.

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.