Login | Register

Should I stay or should I go? Host plant quality mediated trade-offs in the forest tent caterpillar


Should I stay or should I go? Host plant quality mediated trade-offs in the forest tent caterpillar

Plenzich, Christopher (2016) Should I stay or should I go? Host plant quality mediated trade-offs in the forest tent caterpillar. Masters thesis, Concordia University.

Text (application/pdf)
Plenzich_MSc_F2016.pdf - Accepted Version
Available under License Spectrum Terms of Access.


Group living has both negative and positive effects, and various ecological factors can mediate decisions between remaining cohesive and splitting up. We investigated how food quality mediates the trade-off in Malacasoma disstria, the forest tent caterpillar, between (i) remaining in a group on a known food source, thus benefitting from group basking and group predator defenses, but potentially incurring opportunity costs, and (ii) increasing movement in search of a potentially better quality food source and/or splitting into more numerous groups, risking predation. During laboratory experiments in spring 2013, and field experiments in 2014, groups of caterpillars were reared on the foliage of two different tree species; one of high quality: trembling aspen (Populus tremuloides), and the other of lower quality: sugar maple (Acer saccharum). Results indicate that forest tent caterpillar colonies feeding from maple increased locomotion, traveled farther, took more numerous, but smaller meals, and split into smaller, more numerous groups when compared to colonies feeding from aspen. Though other ecological factors were found to mediate group decisions, namely developmental stage, colony size, and wind speed, the presented experiments suggest that a decision between remaining cohesive or otherwise in the presence of different quality food sources exists. The findings suggest that the potential increase of encountering a predator when increasing movement and decreasing cohesion can increase early larval mortality and may be a contributing factor to the rise and decline of an outbreaking population.

Divisions:Concordia University > Faculty of Arts and Science > Biology
Item Type:Thesis (Masters)
Authors:Plenzich, Christopher
Institution:Concordia University
Degree Name:M. Sc.
Date:March 2016
Thesis Supervisor(s):Despland, Emma
Keywords:forest tent caterpillar, malacosoma disstria, foraging, behavior, trade-off, food quality
ID Code:981195
Deposited On:16 Jun 2016 14:59
Last Modified:18 Jan 2018 17:52
All items in Spectrum are protected by copyright, with all rights reserved. The use of items is governed by Spectrum's terms of access.

Repository Staff Only: item control page

Downloads per month over past year

Back to top Back to top