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Mechanisms driving postfire abundance of a generalist mammalAuthor(s): R. Zwolak; D. E. Pearson; Y. K. Ortega; E. E. Crone
Source: Canadian Journal of Zoology. 90: 51-60.
Publication Series: Scientific Journal (JRNL)
Station: Rocky Mountain Research Station
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DescriptionChanges in vertebrate abundance following disturbance are commonly attributed to shifts in food resources or predation pressure, but underlying mechanisms have rarely been tested. We examined four hypotheses for the commonly reported increase in abundance of deer mouse (Peromyscus maniculatus (Wagner, 1845)) following forest fires: source-sink dynamics, decreased predation, increased food resources, and increased foraging efficiency. We found that reproduction of deer mouse was considerably higher in burned versus unburned forests and survival did not differ between habitats, indicating that burned forests were not sink habitats. Comparable survival also suggested that predation rates were similar between habitats. Increased reproduction in burned versus unburned forest suggested better resource conditions, but abundance of seeds and arthropods (the primary food resources for mice) either did not differ between habitats or were higher overall in unburned forest. Foraging experiments indicated that seed removal from depots was substantially higher in burned versus unburned forests after controlling for mouse density. Additionally, in both habitats, mice were captured more often in open microhabitats and the odds of individual insect removal increased with decreasing cover during certain sampling periods. Of the four hypotheses tested, greater foraging efficiency provided the best explanation for elevated populations of deer mouse. However, predation risk may have influenced foraging success.
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CitationZwolak, R.; Pearson, D. E. ; Ortega, Y. K.; Crone, E. E. 2012. Mechanisms driving postfire abundance of a generalist mammal. Canadian Journal of Zoology. 90: 51-60.
Keywordsvertebrate abundance, forest fires, mechanisms, source-sink dynamics, decreased predation, food resources, foraging efficiency
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