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Specialization, Speciation, and RadiationThe Evolutionary Biology of Herbivorous Insects$
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Kelley Tilmon

Print publication date: 2008

Print ISBN-13: 9780520251328

Published to California Scholarship Online: March 2012

DOI: 10.1525/california/9780520251328.001.0001

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PRINTED FROM CALIFORNIA SCHOLARSHIP ONLINE (www.california.universitypressscholarship.com). (c) Copyright University of California Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in CALSO for personal use.date: 25 September 2021

The Oscillation Hypothesis of Host-Plant Range and Speciation

The Oscillation Hypothesis of Host-Plant Range and Speciation

(p.203) Fifteen The Oscillation Hypothesis of Host-Plant Range and Speciation
Specialization, Speciation, and Radiation

Niklas Janz

Sören Nylin

University of California Press

Both seed plants and plant-feeding insects have undergone rapid diversification to a much larger extent than their respective sister groups, but it is not clear why this has happened. While explanations for how insects could have influenced the diversification of flowering plants have typically focused on pollination, explanations for the potential impact of plants on the diversification of insects have often revolved around herbivory. This chapter explores how the utilization of flowering plants as food resources could have promoted speciation rates in insects. It suggests a comprehensive explanation for the generation of variation in host use, the subsequent pruning of this variation, and how it can influence the diversification rates of plant-feeding insects. First, the chapter briefly outlines the general hypothesis for how diversity of phytophagous insects may be promoted by oscillations in host-plant range. It then discusses colonizations and host-range expansions, as well as diet breadth and geographical range, specialization and fragmentation, sympatric speciation, parapatric speciation, and allopatric speciation.

Keywords:   seed plants, phytophagous insects, speciation, diversification, flowering plants, host use, oscillations, oscillation hypothesis, colonizations, host-plant range

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