Summer Activity Patterns of Insectivorous Bats and Their Prey in Tasmania

1988 ◽  
Vol 15 (5) ◽  
pp. 533 ◽  
Author(s):  
RJ Taylor ◽  
MG Oneill
Keyword(s):  
Activity Patterns ◽  
Middle Part ◽  
Secondary Peak ◽  
Foraging Activity ◽  
Foraging Success ◽  
Insectivorous Bats ◽  
Insect Prey ◽  
Low Levels ◽  
Insect Activity ◽  
Energy Gains

Nightly activity patterns of seven species of bats (Eptesicus vulturnus, E. regulus, E. sagittula, Nyctophilus geoffroyi, N. timoriensis, Chalinolobus morio and FalsistreNus tasmaniensis) and their volant insect prey were studied during late spring and summer at four sites in Tasmania. Activity of bats was assessed from trapping results. Bats exhibited a biomodal pattern of foraging activity being most active in the first hours after dark, declining to low levels in the middle part of the night and rising again to a secondary peak in the three hours before dawn. These patterns of activity in bats closely reflected the patterns of insect activity. The insectivorous bats thus appear to have adjusted their nightly activities to match those of their prey, thereby maximising foraging success and energy gains.

Activity patterns and habitat preferences of insectivorous bats in a West African forest–savanna mosaic

2004 ◽  
Vol 20 (4) ◽  
pp. 397-407 ◽  
Author(s):  
Christoph F. J. Meyer ◽  
Christian J. Schwarz ◽  
Jakob Fahr
Keyword(s):  
Open Space ◽  
Activity Patterns ◽  
Habitat Preferences ◽  
Light Trap ◽  
Negative Influence ◽  
Foraging Activity ◽  
The Moon ◽  
Constant Frequency ◽  
Insectivorous Bats ◽  
Bat Activity

We studied activity patterns and habitat use by insectivorous bats in Comoé National Park, Ivory Coast. Bat foraging activity was quantified along five transects representing three different habitat types using acoustic monitoring and captures with mist nets and harp traps. Aerial insect abundance was assessed using a light trap; in addition shrub and tree arthropods were sampled. Bat activity was significantly and positively related to insect availability and ambient temperature, whereas increased visibility of the moon had a negative influence on flight activity. Together, these factors best explained both total bat activity and activity of bats hunting in open space and edge habitats. The interaction between temperature and light intensity was the best predictor of activity by species foraging in obstacle-rich forest habitats, however, the regression model had a low predictive value. Overall, a large proportion (c. 50%) of the variation in bat activity appeared to be a consequence of transect- and/or habitat-specific influences. We found a significant non-linear relationship between the activity of QCF (quasi-constant frequency) and FM–QCF (frequency modulated – quasi-constant frequency) bats and the phase of the moon, with lowest levels of activity occurring near full moon. We interpret this lunar-phobic behaviour as a reflection of a higher predation risk during moonlit periods. For FM (steep frequency modulated) and CF (constant frequency) bats, no significant correlation was found, although there was a trend suggesting that these bats at least were not negatively affected by bright moonlight. Foraging activity of bats was positively correlated with the abundance of atympanate moths; however, no such correlation was found for tympanate moths.

scholarly journals Resource Partitioning between Two Piranhas (Serrasalmus gibbus and Serrasalmus rhombeus) in an Amazonian Reservoir

2017 ◽  
Vol 2017 ◽  
pp. 1-9
Author(s):  
Júlio C. Sá-Oliveira ◽  
Stephen F. Ferrari ◽  
Huann C. Gentil Vasconcelos ◽  
Andrea S. Araujo ◽  
Carlos E. Costa Campos ◽  
...  
Keyword(s):  
Plant Material ◽  
Amazon Basin ◽  
Activity Patterns ◽  
Early Morning ◽  
Foraging Activity ◽  
Closely Related Species ◽  
Flood Season ◽  
Restricted Environment ◽  
Low Levels ◽  
Temporal Overlap

The exploitation of resources by closely related species with similar niches may be mediated by differences in activity patterns, which may vary in nycthemeral scale and seasonal scale. Piranhas Serrasalmus gibbus and Serrasalmus rhombeus are Neotropical predators that occur sympatrically in many environments of the Amazon basin. To evaluate the strategies adopted by these two species in a restricted environment (a reservoir), nycthemeral and seasonal samples were made, identifying the composition of the diet and their activity patterns. A total of 402 specimens were collected: 341 S. gibbus and 61 S. rhombeus. Both species fed themselves primarily on fish, with some seasonal variation being found in S. gibbus during the flood season, when plant material was consumed. There was considerable temporal overlap in the foraging behavior of the two species, although S. rhombeus presented a bimodal pattern of abundance over the 24-hour cycle. S. rhombeus was more active during the nighttime, between dusk and early morning, whereas S. gibbus was active throughout the nycthemeral cycle. These findings indicate low levels of competition between the two species, which allowed for a considerable overlap in nighttime foraging, following distinct nycthemeral patterns of foraging activity and allowing their coexistence.

Activity Patterns, Habitat Use, and Prey Selection by Some African Insectivorous Bats

Biotropica ◽  
1977 ◽  
Vol 9 (2) ◽  
pp. 73 ◽  
Author(s):  
M. B. Fenton ◽  
N. G. H. Boyle ◽  
T. M. Harrison ◽  
D. J. Oxley
Keyword(s):  
Habitat Use ◽  
Prey Selection ◽  
Activity Patterns ◽  
Insectivorous Bats

scholarly journals Trade-Off between Foraging Activity and Infestation by Nest Parasites in the Primitively Eusocial BeeHalictus scabiosae

2010 ◽  
Vol 2010 ◽  
pp. 1-13 ◽  
Author(s):  
Andrea Lienhard ◽  
Lea Mirwald ◽  
Thomas Hötzl ◽  
Ilse Kranner ◽  
Gerald Kastberger
Keyword(s):  
Ambient Temperature ◽  
Time Windows ◽  
Activity Patterns ◽  
Small Time ◽  
Foraging Activity ◽  
Morning Temperature ◽  
Eastern Austria ◽  
Halictine Bees ◽  
Primitively Eusocial ◽  
Match Factor

Diurnal activities ofHalictus scabiosaebees and their nest parasites (major bee-flies, cuckoo wasps, ichneumon wasps,Sphecodesbees, and velvet ants) were investigated at a study site with 159 nests in Eastern Austria. Foraging activity correlated with ambient temperature only before midday and decreased in the afternoon. The activity of nest-infesting parasites increased during the day and correlated with ambient temperature. The match factorfmbetween the ratios of the foraging activities ofH. scabiosaeand the ratios of aspects of morning temperature was assessed on three consecutive days with different weather. The activity patterns of halictine bees and their nest parasites differed: the parasites exhibited only small time windows in which their activities were synchronised with those of their hosts. The bees exhibited an anticyclic behaviour and collected food in times of low parasite pressure and decreased foraging activity when parasite pressure increased.

Influence of weather on two insectivorous bats in a temperate Pacific Northwest rainforest

2009 ◽  
Vol 87 (2) ◽  
pp. 132-138 ◽  
Author(s):  
D. W. Burles ◽  
R. M. Brigham ◽  
R. A. Ring ◽  
T. E. Reimchen
Keyword(s):  
Reproductive Success ◽  
Pacific Northwest ◽  
Weather Conditions ◽  
Negative Influence ◽  
Myotis Lucifugus ◽  
Insectivorous Bats ◽  
Ambient Temperatures ◽  
The Pacific ◽  
Adverse Weather ◽  
Insect Activity

Adverse weather conditions frequently have a significant negative influence on survival and reproductive success of insectivorous bats. Low ambient temperatures increase the energetic costs of maintaining euthermia and reduces insect activity, while precipitation likely adds “clutter” making prey more difficult to detect using echolocation. We studied two species of insectivorous bats, Myotis lucifugus (LeConte, 1831) and Myotis keenii (Merriam, 1895), in the Pacific Northwest of Canada, a region that experiences frequent cool, wet weather during spring and summer. Our study took place during the El Niño – La Niña cycle of 1998–1999, which resulted in contrasting years. The summer of 1998 was unusually warm and dry, while the summer of 1999 was unusually cool and wet. We predicted that both species would be adversely affected by the cool, wet conditions of 1999, resulting in prolonged gestation, late fledging of young, and lower reproductive success. However, this was not the case. Myotis lucifugus did experience delays in reproductive timing and lower reproductive success in 1999, as predicted, whereas M. keenii experienced much shorter gestations, earlier fledgings, and no difference in reproductive success between years. We hypothesize that the ability of M. keenii to glean prey enables it to better cope with cool, wet conditions.

Preliminary observations on factors affecting foraging activity in the limpet Patella vulgata

1990 ◽  
Vol 70 (1) ◽  
pp. 181-195 ◽  
Author(s):  
Colin Little ◽  
David Morritt ◽  
David M. Paterson ◽  
Penny Stirling ◽  
Gray A. Williams
Keyword(s):  
Relative Humidity ◽  
Heavy Rainfall ◽  
Feeding Activity ◽  
Activity Patterns ◽  
High Water ◽  
Irish Sea ◽  
Foraging Activity ◽  
Factors Affecting ◽  
Calm Water ◽  
Lough Hyne

Activity patterns of limpets were studied at two adjacent sites in an Irish sea lough, Lough Hyne, in order to relate timing of activity to physical and biological influences. Activity was suppressed during heavy rainfall, and osmotic stress from dilution appears to have led to increased mortality in transplanted limpets. Activity increased as tides progressed from neaps to springs, and for limpets low on the shore it was enhanced by wave action. It is suggested that lack of activity in calm water may reduce predation pressure from crabs, which caused high mortality in transplanted limpets. Either low relative humidity or dryness of the rock diminished activity of low-water limpets. Differences in feeding activity between low-water limpets and high-water limpets may relate to food supply, since more food was available low on the shore, and the guts of low-water limpets contained more diatoms than those of high-water individuals. Differences between the two sites are at present unexplained but may relate to differences in micro habitats.

Into the light: atypical diurnal foraging activity of Blyth’s horseshoe bat, Rhinolophus lepidus (Chiroptera: Rhinolophidae) on Tioman Island, Malaysia

Mammalia ◽  
2018 ◽  
Vol 83 (1) ◽  
pp. 78-83
Author(s):  
Marcus A.H. Chua ◽  
Sheema Abdul Aziz
Keyword(s):  
Forest Canopy ◽  
Acoustic Monitoring ◽  
Foraging Activity ◽  
Diurnal Activity ◽  
Insectivorous Bats ◽  
Avian Predators ◽  
Horseshoe Bat

Abstract Diurnal flight and foraging activity in insectivorous bats are atypical behaviours that have been recorded from islands with few avian predators and from locations with extended daylight hours. We present the first known observations of diurnal activity of Rhinolophus lepidus in forests on Tioman Island, Malaysia, recorded using visual surveys and acoustic monitoring. The bats were flying during the day and at night, and feeding buzzes detected suggest that they were actively foraging during the day. This appears to be a regular phenomenon on Tioman Island. The absence of resident diurnal avian predators that hunt below the forest canopy may account for the diurnal activity of R. lepidus in forests there.

scholarly journals Does Foraging Activity Affect Foraging Success in the Western Harvester Ant (Hymenoptera: Formicidae)?

2008 ◽  
Vol 101 (1) ◽  
pp. 272-276 ◽  
Author(s):  
Blaine J. Cole ◽  
Rebecca Edwards ◽  
Carter Tate Holbrook ◽  
Lindsey Holm ◽  
Joslin Heyward ◽  
...  
Keyword(s):  
Foraging Activity ◽  
Foraging Success ◽  
Harvester Ant

scholarly journals Coexistence between wildlife and humans at fine spatial scales

2012 ◽  
Vol 109 (38) ◽  
pp. 15360-15365 ◽  
Author(s):  
Neil H. Carter ◽  
Binoj K. Shrestha ◽  
Jhamak B. Karki ◽  
Narendra Man Babu Pradhan ◽  
Jianguo Liu
Keyword(s):  
Human Impacts ◽  
Spatial Scales ◽  
Activity Patterns ◽  
Quantitative Information ◽  
Global Challenge ◽  
Human Needs ◽  
Wildlife Species ◽  
Chitwan National Park ◽  
Low Levels ◽  
Conservation Plans

Many wildlife species face imminent extinction because of human impacts, and therefore, a prevailing belief is that some wildlife species, particularly large carnivores and ungulates, cannot coexist with people at fine spatial scales (i.e., cannot regularly use the exact same point locations). This belief provides rationale for various conservation programs, such as resettling human communities outside protected areas. However, quantitative information on the capacity and mechanisms for wildlife to coexist with humans at fine spatial scales is scarce. Such information is vital, because the world is becoming increasingly crowded. Here, we provide empirical information about the capacity and mechanisms for tigers (a globally endangered species) to coexist with humans at fine spatial scales inside and outside Nepal’s Chitwan National Park, a flagship protected area for imperiled wildlife. Information obtained from field cameras in 2010 and 2011 indicated that human presence (i.e., people on foot and vehicles) was ubiquitous and abundant throughout the study site; however, tiger density was also high. Surprisingly, even at a fine spatial scale (i.e., camera locations), tigers spatially overlapped with people on foot and vehicles in both years. However, in both years, tigers offset their temporal activity patterns to be much less active during the day when human activity peaked. In addition to temporal displacement, tiger–human coexistence was likely enhanced by abundant tiger prey and low levels of tiger poaching. Incorporating fine-scale spatial and temporal activity patterns into conservation plans can help address a major global challenge—meeting human needs while sustaining wildlife.

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