Tanmay and Jana join us for the wet season in Zambia; we host Maggie Mwale from Livingstone Museum

Mar 25, 2018

Maggie with new nests

An enjoyable wet season has seen Gabriel Jamie collect genetic samples and egg phenotype data for our project examining the genetics of egg appearance. Tanmay Dixit and Jana Riederer conducted fieldwork in Zambia for the first time, studying egg rejection, Cuckoo finch colouration, and host rearing environments (the latter in collaboration with Nick Horrocks). Despite it being relatively dry, there was sufficient breeding to collect valuable data for all of these projects. We were visited by Maggie Mwale, Assistant Keeper of Ornithology at the Livingstone Museum, who spent several days with us, sharing in our research in Choma and collecting many nests for her display at the museum.

News

Dr Gabriel Jamie awarded a Leverhulme Early Career Fellowship

Dr Gabriel Jamie has been awarded a Leverhulme Early Career Fellowship based at University of Cambridge. For the fellowship Gabriel will build on his previous work on brood parasitism and the evolution of polymorphisms to understand the incredible diversity of egg...

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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. 

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New paper on evolution of egg signatures

Our paper “Hosts elevate either within-clutch consistency or between-clutch distinctiveness of egg phenotypes in defence against brood parasites” has just been published in the journal Proceedings of the Royal Society of London B. In this study, led by Eleanor Caves, we asked how host eggs evolve adaptations that allow them better to discriminate their own eggs from parasitic eggs. Theoretically, hosts can generate their own individually-distinctive egg ‘signatures’ by laying eggs that appear similar to one another (consistency) but look very different from other individuals’ eggs (distinctiveness). In this new study, we show that host species of two African brood parasites deploy either consistency or distinctiveness, but not both, as defences, and achieve distinctiveness by combining egg colours and patterns in unpredictable combinations.

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Mairenn Attwood awarded Cambridge teaching prize

Congratulations to Mairenn Attwood for being awarded the Janet Moore Prize for teaching in the Department of Zoology at the University of Cambridge, for her outstanding tutorial supervision of final-year undergraduate students, who praised her breadth and depth of knowledge, enthusiasm, and friendliness.  Mairenn follows in the footsteps of Tanmay Dixit who was awarded the Janet Moore Prize in 2020. Well done both for inspiring the next generation of behavioural ecologists!

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