Community structure of insect herbivores is driven by conservatism, escalation and divergence of defensive traits in Ficus

Volf, M., Segar, S.T., Miller, S.E., Isua, B., Sisol, M., Aubona, G., Šimek, P., Moos, M., Laitila, J., Kim, J., Zima, J., Rota, J., Weiblen, G.D., Wossa, S., Salminen, J., Basset, Y., Novotny, V. and Turlings, T. (2017) Community structure of insect herbivores is driven by conservatism, escalation and divergence of defensive traits in Ficus. Ecology Letters, 21 (1). pp. 83-92.

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Abstract

Escalation (macroevolutionary increase) or divergence (disparity between relatives) in trait values are two frequent outcomes of the plant-herbivore arms race. We studied the defences and caterpillars associated with 21 sympatric New Guinean figs. Herbivore generalists were concentrated on hosts with low protease and oxidative activity. The distribution of specialists correlated with phylogeny, protease and trichomes. Additionally, highly specialised Asota moths used alkaloid rich plants. The evolution of proteases was conserved, alkaloid diversity has escalated across the studied species, oxidative activity has escalated within one clade, and trichomes have diverged across the phylogeny. Herbivore specificity correlated with their response to host defences: escalating traits largely affected generalists and divergent traits specialists; but the effect of escalating traits on extreme specialists was positive. In turn, the evolution of defences in Ficus can be driven towards both escalation and divergence in individual traits, in combination providing protection against a broad spectrum of herbivores.

Item Type: Article
Keywords: Alkaloids, Choreutidae, coevolution, cysteine protease, herbivore, Lepidoptera, New Guinea, polyphenols, Pyraloidea trichomes
Divisions: Crop and Environment Sciences
Depositing User: Ms Kath Osborn
Date Deposited: 18 Dec 2019 15:13
Last Modified: 18 Dec 2019 15:13
URI: http://hau.repository.guildhe.ac.uk/id/eprint/17485

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