The Influence of Precipitation on Reproduction by Myotis Bats in British Columbia

Grindal, Scott D.; Collard, T.; Brigham, R. Mark; Barclay, Robert M. R.

doi:10.2307/2426468

Cited by 95 publications

(99 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, the equal sex ratio of M. lucifugus in Southeast Alaska demonstrates that females tolerate the wet climate. Precipitation also decreased reproductive success of this species during rainy years in more arid regions of British Columbia (Grindal et al, 1992). Although the ratio of reproductive to nonreproductive females in Southeast Alaska is not known, the occurrence of maternity colonies demonstrates that M. lucifugus females are able to raise young in this cool, rainy climate.…”

Section: Resultsmentioning

confidence: 92%

Distributional Limits of Bats in Alaska

Parker¹,

Lawhead²,

Cook³

1997

ARCTIC

View full text Add to dashboard Cite

ABSTRACT. Bats in temperate regions are relatively well studied, yet little research has focused on the northern limit of their distribution. We document the northwestern extent of bats in North America using museum holdings, literature records, and field research in Alaska. Six bat species are confirmed from Alaska: Myotis lucifugus, M. keenii, M. californicus, M. volans, Lasionycteris noctivagans, and Eptesicus fuscus. M. lucifugus occurs throughout much of Alaska south of the Arctic Circle, whereas four other species occur only in Southeast Alaska. Climate, roost availability, extent of forested habitat, geographic barriers, length of night, and prey abundance appear to influence the distribution of bats in Alaska, although the relative contribution of these factors is unknown.Key words: Alaska, latitude, bats, distribution, limiting factors, Myotis, Lasionycteris, Eptesicus RÉSUMÉ. Si, dans les régions tempérées, les chauves-souris ont fait l'objet d'études relativement approfondies, on a par contre mené peu de recherches sur la limite septentrionale de leur répartition. Cet article décrit l'extension nord-ouest de l'aire des chauves-souris en Amérique du Nord en faisant appel à des pièces muséologiques, des documents comportant des relevés, et des recherches sur le terrain en Alaska. On confirme que six espèces de chauves-souris se retrouvent en Alaska: Myotis lucifugus, M. keenii, M. californicus, M. volans, Lasionycteris noctivagans et Eptesicus fuscus. M. lucifugus est répandue presque partout en Alaska au sud du cercle polaire, tandis que quatre autres espèces ne se retrouvent que dans le sud-est de l'Alaska. Il semble que le climat, la disponibilité des sites de reproduction, l'étendue de l'habitat forestier, les barrières géographiques, la longueur de la nuit et l'abondance des proies influencent la distribution des chauves-souris en Alaska, bien qu'on ne connaisse pas la contribution relative de ces facteurs.

show abstract

Section: Resultsmentioning

confidence: 92%

Distributional Limits of Bats in Alaska

Parker¹,

Lawhead²,

Cook³

1997

ARCTIC

View full text Add to dashboard Cite

show abstract

“…In addition to a general warming trend, regional climate change scenarios predict greater extremes in variability of weather events such as droughts and floods, more severe storms, and an increase in the number of hot spells (Christensen et al 2007). Delayed or decreased reproduction in some species of bats has been attributed to both unusually wet or dry conditions (Racey 1973, Ransome 1990, Grindal et al 1992, Rhodes 2007, cold snaps in autumn have killed large numbers of little brown bats thought to be in migration (Zimmerman 1937), and flood events at caves associated with spring and summer storms have killed thousands of bats of several species in the USA, including species now considered to be endangered (DeBlase et al 1965, Gore & Hovis 1994. Hence, extreme climate events can have directly negative consequences for bat populations.…”

Section: Impacts Of Greater Climate Extremesmentioning

confidence: 99%

Broadening the focus of bat conservation and research in the USA for the 21st century

Weller¹,

Cryan²,

O’Shea³

2009

Endang. Species. Res.

View full text Add to dashboard Cite

Appropriately, bat conservation in the USA during the 20th century focused on species that tend to aggregate in large numbers and locations (e.g. maternity roosts, hibernacula) where populations are most vulnerable. Extensive research into habitat needs (primarily for roosting) of reproductive females during the previous 2 decades has produced a wealth of information useful for developing conservation strategies for this group in their summer roost areas. However, the ecological needs of males, non-reproductive females, and juveniles have received far less attention, as have the ecological needs of all bats outside the pup-rearing season. Hence, it is unlikely that a single paradigm could comprehensively address conservation needs of all demographic groups within a species because they may have different seasonal distributions, reproductive strategies, and thermoregulatory needs. Herein, we recommend research into a wider spectrum of demographic groups and seasons to form a more holistic vision of the conservation needs of bats. We urge greater attention to understanding thermo-energetic and reproductive underpinnings of observed patterns of seasonal distribution and habitat selection by bats in the USA. Such understanding is instrumental for development of scientifically sound conservation strategies to confront emerging threats to conservation of bats in the 21st century: climate change, disease, habitat degradation, and environmental contaminants. We discuss interconnections among these emerging threats and the fundamental need to incorporate understanding of thermo-energetic strategies of bats in development of conservation strategies or legislation to mitigate potential impacts on bat populations of the USA.

show abstract

“…Flexible and opportunistic foraging behaviour has been recorded in many insectivorous bat species, and numerous factors can influence habitat use and patterns of activity (e.g., Fenton & Bell 1979;Barclay 1985;O'Neill & Taylor 1989;Brigham 1991;Brigham et al 1992;Grindal et al 1992;Fenton et al 1993). Ecomorphology and echolocation call structure influence speed and manoeuvrability of bats, and hence where they can forage effectively (Aldridge & Rautenbach 1987;Norberg & Rayner 1987;Crome & Richards 1988).…”

Section: Introductionmentioning

confidence: 99%

Influence of season, habitat, temperature, and invertebrate availability on nocturnal activity of the New Zealand long‐tailed bat (Chalinolobus tuberculatus)

O’Donnell

2000

New Zealand Journal of Zoology

View full text Add to dashboard Cite

Nocturnal patterns of activity by the New Zealand long-tailed bat (Chalinolobus tuberculatus) varied significantly in relation to habitat, season, time of night, temperature, and invertebrate activity. Automatic bat detection units recorded 12072 bat passes containing 593 feeding buzzes during 580 nights of sampling. Overall, 46.3% of passes were along roads within forest, 42.7% along forest edges, 8.1% in open grassland and 2.9% within forest. Pass rates averaged 30.8/night (95% confidence interval (CI) = 23.3-38.4) during spring, 31.7 (CI = 21.3-42.1) during summer, 6.7 (CI = 4.4-9.0) during autumn and 1.6 (CI = 0.2-3.0) during winter. Bats were active throughout the night in all habitats, but the patterns of their activity were different in each. During spring and summer a significantly higher proportion of bat passes in edge and open habitats were recorded in the first 2 h after sunset, and activity then declined steadily towards dawn. In road habitats activity peaked in the second hour but was more consistent during the remaining hours of the night. Activity in forest did not vary through the night. Patterns were similar, though less pronounced, in autumn but in winter there was little activity during the first three hours after sunset or in the 5 h before dawn. Analysis of deviance models indicated that habitat, season, minimum overnight temperature, and invertebrate activity contributed to explaining the activities of bats. Overnight temperature was more important than invertebrate activity in explaining total bat activity in a night. Invertebrate activity was more significant than minimum temperature in the model explaining the amount of foraging activity per night, inferring that minimum temperature determines whether bats fly at night, while invertebrate activity determines how long bats feed. Techniques for indexing bat activity that are designed to survey distribution or monitor population trends should control for temporal variation and temperature to enable valid comparisons between counts.

show abstract

The Influence of Precipitation on Reproduction by Myotis Bats in British Columbia

Cited by 95 publications

References 16 publications

Distributional Limits of Bats in Alaska

Distributional Limits of Bats in Alaska

Broadening the focus of bat conservation and research in the USA for the 21st century

Influence of season, habitat, temperature, and invertebrate availability on nocturnal activity of the New Zealand long‐tailed bat (Chalinolobus tuberculatus)

Contact Info

Product

Resources

About