Seasonal shifts in the diet of the big brown bat (Eptesicus fuscus), Fort Collins, Colorado
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Abstract
Recent analyses suggest that the big brown bat (Eptesicus fuscus) may be less of a beetle specialist (Coleoptera) in the western United States than previously thought, and that its diet might also vary with temperature. We tested the hypothesis that big brown bats might opportunistically prey on moths by analyzing insect fragments in guano pellets from 30 individual bats (27 females and 3 males) captured while foraging in Fort Collins, Colorado, during May, late July–early August, and late September 2002. We found that bats sampled 17–20 May (n = 12 bats) had a high (81–83%) percentage of volume of lepidopterans in guano, with the remainder (17–19% volume) dipterans and no coleopterans. From 28 May–9 August (n = 17 bats) coleopterans dominated (74–98% volume). On 20 September (n = 1 bat) lepidopterans were 99% of volume in guano. Migratory miller moths (Euxoa auxiliaris) were unusually abundant in Fort Collins in spring and autumn of 2002 and are known agricultural pests as larvae (army cutworms), suggesting that seasonal dietary flexibility in big brown bats has economic benefits.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Seasonal shifts in the diet of the big brown bat (Eptesicus fuscus), Fort Collins, Colorado |
| Series title | Southwestern Naturalist |
| DOI | 10.1894/SGM-28.1 |
| Volume | 59 |
| Issue | 4 |
| Year Published | 2014 |
| Language | English |
| Publisher | Southwestern Association of Naturalists |
| Publisher location | Washington, D.C. |
| Contributing office(s) | Fort Collins Science Center |
| Description | 6 p. |
| First page | 511 |
| Last page | 516 |
| Time Range Start | 2002-05-01 |
| Time Range End | 2002-09-30 |
| Country | United States |
| State | Colorado |
| City | Fort Collins |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |