The functional significance of communual roosting by the big brown bat, Eptesicus fuscus

Creator: 

Brigham, Robert Mark

Date: 

1985

Abstract: 

I used radio-tracking and roost closures to test five hypotheses which explain communal roosting behaviour by the Big Brown Bat, Eptesicus fuscus. These include, a limit to the number of available sites, access to preferred sites where reproductive success is enhanced, avoidance of ambush predators, the two-strategies hypothesis, and reducing commuting distances to foraging areas. Site tenacity, short movement distances and a tendency towards decreased young production with eviction were consistent with the access to preferred sites hypothesis. Although departures were significantly clumped in time, there was no threshold colony size which suggests that ambush predation is only a secondary reason for communal roosting. I tenatively rejected the two strategies hypothesis on the basis of no evidence for following behaviour, a dominance hierarchy or constant cluster composition. Foraging parameters although consistent with minimizing commuting costs, were also consistent with an opportunistic strategy which does not explain communal roosting.

Subject: 

Bats -- Nests
Big brown bat

Language: 

English

Publisher: 

Carleton University

Thesis Degree Name: 

Master of Science: 
M.Sc.

Thesis Degree Level: 

Master's

Thesis Degree Discipline: 

Biology

Parent Collection: 

Theses and Dissertations

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