Camouflage is one of the most famous examples of adaptation in nature, but amazingly, it has proven surprisingly hard to show that it really works in the wild, as seen by the eyes of the appropriate predators. This study shows that natural nests in the wild in Zambia survive better when they’re concealed by better-camouflaged nightjar parents sitting tight on their eggs (like the Mozambique nightjar at left), or when they contain better-camouflaged eggs left exposed by their fleeing plover and courser parents. Read more in an article about the study in Nature World News, or in the original paper by Jolyon Troscianko, Jared Wilson-Aggarwal, Martin Stevens and Claire Spottiswoode, and is available open access in Scientific Reports.
New paper published on Weber’s Law and mimicry
Our paper ‘Why and how to apply Weber’s Law to coevolution and mimicry’ has been published in the journal Evolution. This perspectives paper, written by Tanmay Dixit, Eleanor Caves, Claire Spottiswoode, and Nicholas Horrocks, argues that Weber’s Law of proportional processing can lead to otherwise counterintuitive predictions about the evolutionary trajectories of mimicry systems. Weber’s Law states that when the magnitude of a stimulus is large, it is more difficult to discriminate a change or difference from that stimulus. In other words, relative differences are more salient than absolute differences. We show that Weber’s Law could have implications for mimicry: when stimulus magnitudes are high, it should be more difficult to discriminate a model from a mimic. This leads to testable predictions about evolutionary trajectories of models and mimics. We also present a framework for testing Weber’s Law and its implications for coevolution.