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A geographic mosaic of trophic interactions and selection: trees, aphids and birds


Smith, DS and Bailey, JK and Shuster, SM and Whitham, TG, A geographic mosaic of trophic interactions and selection: trees, aphids and birds, Journal of Evolutionary Biology, 24, (2) pp. 422-429. ISSN 1010-061X (2011) [Refereed Article]

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DOI: doi:10.1111/j.1420-9101.2010.02178.x


Genetic variation in plants is known to influence arthropod assemblages and species interactions. However, these influences may be contingent upon local environmental conditions. Here, we examine how plant genotype-based trophic interactions and patterns of natural selection change across environments. Studying the cottonwood tree, Populus angustifolia, the galling aphid, Pemphigus betae and its avian predators, we used three common gardens across an environmental gradient to examine the effects of plant genotype on gall abundance, gall size, aphid fecundity and predation rate on galls. Three patterns emerged: (i) plant genotype explained variation in gall abundance and predation, (ii) GxE explained variation in aphid fecundity, and environment explained variation in gall abundance and gall size, (iii) natural selection on gall size changed from directional to stabilizing across environments.

Item Details

Item Type:Refereed Article
Keywords:community genetics, cottonwood, genes to ecosystem, geographic mosaic, Populus, predator/prey, selection, trophic interactions
Research Division:Environmental Sciences
Research Group:Climate change impacts and adaptation
Research Field:Climate change impacts and adaptation not elsewhere classified
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Terrestrial biodiversity
UTAS Author:Bailey, JK (Associate Professor Joe Bailey)
ID Code:78135
Year Published:2011
Web of Science® Times Cited:32
Deposited By:Plant Science
Deposited On:2012-06-15
Last Modified:2012-11-27
Downloads:1 View Download Statistics

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