The influence of roost closure on the roosting and foraging behaviour of Eptesicus fuscus (Chiroptera: Vespertilionidae)

1986 ◽  
Vol 64 (5) ◽  
pp. 1128-1133 ◽  
Author(s):  
R. Mark Brigham ◽  
M. Brock Fenton
Keyword(s):  
Reproductive Success ◽  
Direct Observation ◽  
Foraging Behaviour ◽  
Eptesicus Fuscus ◽  
Maximum Distance ◽  
Radio Tracking ◽  
Site Specific ◽  
Big Brown Bats ◽  
Specific Factors ◽  
Foraging Flight

We used radio tracking and direct observation to determine the effect of roost closure on the roosting and foraging behaviour of big brown bats (Eptesicus fuscus) in maternity colonies near Ottawa. Individuals were site loyal, but after eviction they moved short distances to new roosts where they tended to produce fewer offspring. The time spent on the first foraging flight, the maximum distance travelled, and the use of feeding areas did not change with exclusion. The results suggest that bats roost to take advantage of site-specific factors that may increase reproductive success.

Flexibility in foraging and roosting behaviour by the big brown bat (Eptesicus fuscus)

1991 ◽  
Vol 69 (1) ◽  
pp. 117-121 ◽  
Author(s):  
R. Mark Brigham
Keyword(s):  
British Columbia ◽  
Pinus Ponderosa ◽  
Ponderosa Pine ◽  
Foraging Behaviour ◽  
Eptesicus Fuscus ◽  
Foraging Area ◽  
South Central ◽  
Big Brown Bats ◽  
Big Brown Bat ◽  
Pine Trees

I used radiotelemetry to study the roosting and foraging behaviour of big brown bats (Eptesicus fuscus) in south central British Columbia. Maternity colonies were found in hollows of dead ponderosa pine trees (Pinus ponderosa) and colony members were not loyal to specific trees. Individuals consistently foraged above a 300-m stretch of the Okanagan River, travelling 1.8 km on average from day roosts to the foraging area. There were significant differences in the duration of foraging bouts among different sex and age-classes. The results are compared with data collected in a similar manner for a population in Ontario, where, in contrast to British Columbia, E. fuscus were highly loyal to man-made roost structures and on average travelled less than 1 km to foraging sites that varied nightly. I suggest that the marked difference in both roosting and foraging behaviour is due to differences in the availability and structure of roosts and in the distribution of insect prey.

Foraging Behaviour of the Australian Ghost Bat, Macroderma gigas (Microchiroptera: Megadermatidae)

1985 ◽  
Vol 33 (5) ◽  
pp. 705 ◽  
Author(s):  
CR Tidemann ◽  
DM Priddel ◽  
JE Nelson ◽  
JD Pettigrew
Keyword(s):  
Direct Observation ◽  
Foraging Behaviour ◽  
Radio Tracking ◽  
Hunting Behaviour ◽  
Flying Insects ◽  
Mean Size ◽  
The Mean ◽  
Vantage Points

The foraging behaviour of Macroderma gigas was investigated in the field by radio-tracking of tagged individuals and by direct observation of feeding bats in May 1983. Foraging areas were centred, on average, 1.9 km from the day roost. The mean size of foraging areas was 61 ha and tagged bats generally returned to the same areas each night. Hunting behaviour of bats within foraging areas consisted of observation at vantage points, with brief sallies to capture prey, mostly insects on the ground, although hawking of flying insects was also observed. Vantage points were changed about every 15 min during foraging periods. The mean distance between them was 360 m. Foraging areas were not exclusive, there was overlap between the ranges of several tagged individuals, and in one case an area was used by 20 bats.

scholarly journals Sampling Blood from Big Brown Bats (Eptesicus fuscus) in the Field with and without Anesthesia: Impacts on Survival

2006 ◽  
Vol 42 (4) ◽  
pp. 849-852 ◽  
Author(s):  
Laura E. Ellison ◽  
Thomas J. O'Shea ◽  
Jeffrey Wimsatt ◽  
Roger D. Pearce ◽  
Daniel J. Neubaum ◽  
...  
Keyword(s):  
Eptesicus Fuscus ◽  
Big Brown Bats

Field Observations on the Common Striped Possum (Dactylopsila Trivirgata) in North Queensland.

1996 ◽  
Vol 23 (6) ◽  
pp. 755 ◽  
Author(s):  
KA Handasyde ◽  
RW Martin
Keyword(s):  
Body Weight ◽  
Home Range ◽  
Foraging Behaviour ◽  
Male Body ◽  
Radio Tracking ◽  
Minimum Convex Polygon ◽  
Far North ◽  
Large Trees ◽  
The Common ◽  
Primary Habitat

Habitat utilisation and foraging behaviour by the common striped possum (Dactylopsila trivirgata) was investigated by means of spotlighting and radio-tracking at Shiptons Flat, far north Queensland. Vine forest was the primary habitat of D. trivirgata; however, animals were also observed in open eucalypt (Eucalyptus tereticornis) woodland. Information collected on foraging behaviour suggests that D. trivirgata are generalist insectivores consuming some fruit and other foodstuffs, such as honey. Radio-tracking data were used to calculate the home-range areas of two subadult males. The home range of the smaller male (body weight 290 g) was 5.2 ha (by the 95% harmonic mean (HM) method) or 6.5 ha (by the minimum convex polygon (MCP) method), and that of the larger male (body weight 415 g) was 21.2 ha (95% HM) or 21.3 ha (MCP). Large trees with hollows, which are utilized for denning, appear to be an important feature of the habitat for this species. D. trivirgata exhibits a pronounced degree of sociality and may breed seasonally. Observations suggest that amethystine pythons (Morelia amethistina) may be major predators of D. trivirgata at Shiptons Flat.

Lack of relationship between simulated fish population responses and their life history traits: inadequate models, incorrect analysis, or site-specific factors?

2005 ◽  
Vol 62 (4) ◽  
pp. 886-902 ◽  
Author(s):  
Kenneth A Rose
Keyword(s):  
Life History ◽  
Life History Traits ◽  
Lake Trout ◽  
Fish Population ◽  
Population Models ◽  
Site Specific ◽  
Density Dependent ◽  
Population Responses ◽  
Adult Growth ◽  
Specific Factors

Relationships between fish population responses to changes in their vital rates and commonly available life history traits would be a powerful screening tool to guide management about species vulnerability, to focus future data collection on species and life stages of concern, and to aid in designing effective habitat enhancements. As an extension of previous analyses by others, I analyzed the responses to changes in fecundity and yearling survival of age-structured matrix and individual-based population models of 17 populations comprising 10 species. Simulations of the matrix models showed that the magnitude of population responses, but not the relative order of species sensitivity, depended on the state (sustainable or undergoing excessive removals) of the population. Matrix and individual-based models predicted population responses that appeared to be unrelated to their species-level life history traits when responses were plotted on a three-end-point life history surface. Density-dependent adult growth was added to the lake trout (Salvelinus namaycush) matrix model, and simulations demonstrated the potential importance to predicted responses of density-dependent processes outside the usual spawner–recruit relationship. Four reasons for the lack of relationship between population responses and life history traits related to inadequate population models, incorrect analysis, inappropriate life history model, and important site-specific factors are discussed.

Genetic relationships between roost-mates in a fission–fusion society of tree-roosting big brown bats (Eptesicus fuscus)

2007 ◽  
Vol 62 (7) ◽  
pp. 1043-1051 ◽  
Author(s):  
Jackie D. Metheny ◽  
Matina C. Kalcounis-Rueppell ◽  
Craig K. R. Willis ◽  
Kristen A. Kolar ◽  
R. Mark Brigham
Keyword(s):  
Genetic Relationships ◽  
Eptesicus Fuscus ◽  
Big Brown Bats

A record of Siamese twinning in bats

1969 ◽  
Vol 47 (1) ◽  
pp. 154-154 ◽  
Author(s):  
R. L. Peterson ◽  
M. Brock Fenion
Keyword(s):  
Eptesicus Fuscus ◽  
Royal Ontario Museum ◽  
Big Brown Bats ◽  
Siamese Twin

Specimens of Siamese twin big brown bats (Eptesicus fuscus) now in the Royal Ontario Museum appear to represent the first reported occurrence among bats.

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