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The early wasp plucks the flower: disparate extant diversity of sawfly superfamilies (Hymenoptera:‘Symphyta’) may reflect asynchronous switching to angiosperm hosts
Department of Ecosystems in the Barents Region, Norwegian Institute of Bioeconomy Research, Svanvik, Norway.
Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland.
German Centre for Integrative Biodiversity Research (iDiv) Halle–Jena–Leipzig, Leipzig, Germany.
Department of Biological and Environmental Sciences, University of Gothenburg and Gothenburg Global Biodiversity Centre, Sweden.
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2019 (English)In: Biological Journal of the Linnean Society, ISSN 0024-4066, E-ISSN 1095-8312, Vol. 128, no 1, p. 1-19Article in journal (Refereed) Published
Abstract [en]

The insect order Hymenoptera originated during the Permian nearly 300 Mya. Ancestrally herbivorous hymenopteran lineages today make up the paraphyletic suborder ‘Symphyta’, which encompasses c. 8200 species with very diverse host-plant associations. We use phylogeny-based statistical analyses to explore the drivers of diversity dynamics within the ‘Symphyta’, with a particular focus on the hypothesis that diversification of herbivorous insects has been driven by the explosive radiation of angiosperms during and after the Cretaceous. Our ancestral-state estimates reveal that the first symphytans fed on gymnosperms, and that shifts onto angiosperms and pteridophytes – and back – have occurred at different time intervals in different groups. Trait-dependent analyses indicate that average net diversification rates do not differ between symphytan lineages feeding on angiosperms, gymnosperms or pteridophytes, but trait-independent models show that the highest diversification rates are found in a few angiosperm-feeding lineages that may have been favoured by the radiations of their host taxa during the Cenozoic. Intriguingly, lineages-through-time plots show signs of an early Cretaceous mass extinction, with a recovery starting first in angiosperm-associated clades. Hence, the oft-invoked assumption of herbivore diversification driven by the rise of flowering plants may overlook a Cretaceous global turnover in insect herbivore communities during the rapid displacement of gymnosperm- and pteridophyte-dominated floras by angiosperms.

Place, publisher, year, edition, pages
2019. Vol. 128, no 1, p. 1-19
Keywords [en]
diversification rates, flowering plants, insect–plant interactions, macroevolution, mass extinctions
National Category
Evolutionary Biology Biological Systematics
Research subject
Diversity of life
Identifiers
URN: urn:nbn:se:nrm:diva-3446DOI: 10.1093/biolinnean/blz071OAI: oai:DiVA.org:nrm-3446DiVA, id: diva2:1374188
Available from: 2019-11-29 Created: 2019-11-29 Last updated: 2019-12-02Bibliographically approved

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