The Evolution of Fangs, Venom, and Mimicry Systems in Blenny Fishes

Casewell, Nicholas and Visser, Jeroen and Baumann, Kate and Dobson, James and Han, Han and Kuruppu, Sanjaya and Morgan, Michael and Romilio, Anthony and Weisback, Vera and Syed, Ali and Debono, Jordan and Koludarov, Ivan and Que, Ivo and Bird, Gregory and Cooke, Gavan and Nouwens, Amanda and Hodgson, Wayne and Wagstaff, Simon and Cheny, Karen and Vetter, Irina and van der Weerd, Louise and Richardson, Michael and Fry, Bryan (2017) The Evolution of Fangs, Venom, and Mimicry Systems in Blenny Fishes. Current Biology, 27 (8). pp. 1184-1191. ISSN 1879-0445

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Official URL: https://doi.org/10.1016/j.cub.2017.02.067

Abstract

Venom systems have evolved on multiple occasions across the animal kingdom, and they can act as key adaptations to protect animals from predators. Consequently, venomous animals serve as models for a rich source of mimicry types, as non-venomous species benefit from reductions in predation risk by mimicking the coloration, body shape, and/or movement of toxic counterparts. The frequent evolution of such deceitful imitations provides notable examples of phenotypic convergence and are often invoked as classic exemplars of evolution by natural selection. Here, we investigate the evolution of fangs, venom, and mimetic relationships in reef fishes from the tribe Nemophini (fangblennies). Comparative morphological analyses reveal that enlarged canine teeth (fangs) originated at the base of the Nemophini radiation and have enabled a micropredatory feeding strategy in non-venomous Plagiotremus spp. Subsequently, the evolution of deep anterior grooves and their coupling to venom secretory tissue provide Meiacanthus spp. with toxic venom that they effectively employ for defense. We find that fangblenny venom contains a number of toxic components that have been independently recruited into other animal venoms, some of which cause toxicity via interactions with opioid receptors, and result in a multifunctional biochemical phenotype that exerts potent hypotensive effects. The evolution of fangblenny venom has seemingly led to phenotypic convergence via the formation of a diverse array of mimetic relationships that provide protective (Batesian mimicry) and predatory (aggressive mimicry) benefits to other fishes. Our results further our understanding of how novel morphological and biochemical adaptations stimulate ecological interactions in the natural world.

Item Type: Journal Article
Keywords: evolution, venomon, fish
Faculty: Faculty of Science & Technology
Depositing User: Dr Gavan Cooke
Date Deposited: 25 May 2017 14:08
Last Modified: 25 May 2017 14:08
URI: http://arro.anglia.ac.uk/id/eprint/701671

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