Lasiurus

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Paul M. Cryan - One of the best experts on this subject based on the ideXlab platform.

Michael B. Wunder - One of the best experts on this subject based on the ideXlab platform.

Robert M. R. Barclay - One of the best experts on this subject based on the ideXlab platform.

  • Evidence of late-summer mating readiness and early sexual maturation in migratory tree-roosting bats found dead at wind turbines.
    PloS one, 2012
    Co-Authors: Paul M. Cryan, Craig K R Willis, Robert M. R. Barclay, Erin F. Baerwald, Joel W. Jameson, E. Apple Snider, Elizabeth G. Crichton
    Abstract:

    Understanding animal mating systems is an important component of their conservation, yet the precise mating times for many species of bats are unknown. The aim of this study was to better understand the details and timing of reproductive events in species of bats that die most frequently at wind turbines in North America, because such information can help inform conservation strategies. We examined the reproductive anatomy of hoary bats (Lasiurus cinereus), eastern red bats (L. borealis), and silver-haired bats (Lasionycteris noctivagans) found dead beneath industrial-scale wind turbines to learn more about when they mate. We evaluated 103 L. cinereus, 18 L. borealis, and 47 Ln. noctivagans from wind energy facilities in the United States and Canada. Histological analysis revealed that most male L. cinereus and L. borealis, as well as over half the Ln. noctivagans examined had sperm in the caudae epididymides by late August, indicating readiness to mate. Testes regression in male hoary bats coincided with enlargement of seminal vesicles and apparent growth of keratinized spines on the glans penis. Seasonality of these processes also suggests that mating could occur during August in L. cinereus. Spermatozoa were found in the uterus of an adult female hoary bat collected in September, but not in any other females. Ovaries of all females sampled had growing secondary or tertiary follicles, indicating sexual maturity even in first-year females. Lasiurus cinereus, L. borealis, and Ln. noctivagans are the only North American temperate bats in which most first-year young of both sexes are known to sexually mature in their first autumn. Our findings provide the first detailed information published on the seasonal timing of mating readiness in these species most affected by wind turbines.

  • hoary bat Lasiurus cinereus
    2000
    Co-Authors: Catherine E. Koehler, Robert M. R. Barclay
    Abstract:

    Little information is available on growth rates and reproductive effort in microchiropteran bats that breed in temperate areas, are not colonial, and do not hibernate. We measured growth in individual young of the hoary bat, Lasiurus cinereus, a solitary, foliage-roosting, migratory species, and assessed growth rate using changes in forearm length. We tested the prediction that growth is slower in this than in other species because of the less stable thermal environment that adults and juveniles experience. Forearm length and mass of 1day-old young (X + SE) were 19.11 ? 0.30 mm and 4.73 ? 0.20 g, respectively. Over 3 years, growth rate of young differed, with young growing slowest (1.14 mm/day) during the coldest year and fastest (1.45 mm/day) during the warmest year. Young were not weaned until 7 weeks of age and nearly 3 weeks after fledging and continued to gain mass over winter. Unlike other species, lactating females did not lose mass through the breeding season. Based on a Levenberg-Marquardt algorithm for nonlinear regression, the growth constant of young hoary bats (0.083 in females) is less than that documented for most other species breeding in temperate North America. Migratory habits of L. cinereus allow adults and young of the year to forage throughout winter and may be associated with slow growth in this species and production of relatively large litters in species of Lasiurus in general.

  • POST-NATAL GROWTH AND BREEDING BIOLOGY OF THE HOARY BAT (Lasiurus CINEREUS)
    Journal of Mammalogy, 2000
    Co-Authors: Catherine E. Koehler, Robert M. R. Barclay
    Abstract:

    Little information is available on growth rates and reproductive effort in microchiropteran bats that breed in temperate areas, are not colonial, and do not hibernate. We measured growth in individual young of the hoary bat, Lasiurus cinereus, a solitary, foliage-roosting, migratory species, and assessed growth rate using changes in forearm length. We tested the prediction that growth is slower in this than in other species because of the less stable thermal environment that adults and juveniles experience. Forearm length and mass of 1-day-old young (X ± SE) were 19.11 ± 0.30 mm and 4.73 ± 0.20 g, respectively. Over 3 years, growth rate of young differed, with young growing slowest (1.14 mm/day) during the coldest year and fastest (1.45 mm/day) during the warmest year. Young were not weaned until 7 weeks of age and nearly 3 weeks after fledging and continued to gain mass over winter. Unlike other species, lactating females did not lose mass through the breeding season. Based on a Levenberg-Marquardt algorithm for nonlinear regression, the growth constant of young hoary bats (0.083 in females) is less than that documented for most other species breeding in temperate North America. Migratory habits of L. cinereus allow adults and young of the year to forage throughout winter and may be associated with slow growth in this species and production of relatively large litters in species of Lasiurus in general.

  • Variation in the echolocation calls of the hoary bat (Lasiurus cinereus) : influence of body size, habitat structure, and geographic location
    Canadian Journal of Zoology, 1999
    Co-Authors: Robert M. R. Barclay, James H. Fullard, David S. Jacobs
    Abstract:

    The echolocation calls of bats vary according to the task being undertaken by the individual. Within species, there is evidence for geographic, habitat, and individual variation, although it is often difficult to separate these factors and rule out variation in recording or analysis techniques. We studied the variation in echolocation call design of the hoary bat (Lasiurus cinereus) by analyzing calls, recorded in the same manner, from free-flying bats at one site in Manitoba and at four sites in the Hawaiian islands. Sites varied in terms of the proximity of the bats to vegetation. As predicted, individuals from the larger subspecies (Lasiurus cinereus cinereus; Manitoba) used lower frequency calls than did the smaller individuals in Hawaii. Within the same habitat type (open or closed), there was evidence for differences in echolocation call design between populations on different islands. On the island of Hawaii, bats at a single site used shorter higher frequency calls when foraging within the vegetat...

  • Differences in the Diets of Juvenile and Adult Hoary Bats, Lasiurus cinereus
    Journal of Mammalogy, 1994
    Co-Authors: Scott L. Rolseth, Catherine E. Koehler, Robert M. R. Barclay
    Abstract:

    The diets of hoary bats ( Lasiurus cinereus ) within the first 2 weeks post-fledging were studied by means of fecal analysis. Results were compared to the diet of adult hoary bats within the same area. Juvenile bats consumed significantly fewer Odonata than did adults. Chironomidae (Diptera) were the major contributor to the diet of juveniles during the 1st week of flight, but were a negligible component in the diet of older juveniles or adults. Due to a lack of experience, juveniles likely have poor handling skills of larger insects. However, lower wing loading and greater maneuverability may make small prey more available to juveniles.

Elizabeth G. Crichton - One of the best experts on this subject based on the ideXlab platform.

  • Evidence of late-summer mating readiness and early sexual maturation in migratory tree-roosting bats found dead at wind turbines.
    PloS one, 2012
    Co-Authors: Paul M. Cryan, Craig K R Willis, Robert M. R. Barclay, Erin F. Baerwald, Joel W. Jameson, E. Apple Snider, Elizabeth G. Crichton
    Abstract:

    Understanding animal mating systems is an important component of their conservation, yet the precise mating times for many species of bats are unknown. The aim of this study was to better understand the details and timing of reproductive events in species of bats that die most frequently at wind turbines in North America, because such information can help inform conservation strategies. We examined the reproductive anatomy of hoary bats (Lasiurus cinereus), eastern red bats (L. borealis), and silver-haired bats (Lasionycteris noctivagans) found dead beneath industrial-scale wind turbines to learn more about when they mate. We evaluated 103 L. cinereus, 18 L. borealis, and 47 Ln. noctivagans from wind energy facilities in the United States and Canada. Histological analysis revealed that most male L. cinereus and L. borealis, as well as over half the Ln. noctivagans examined had sperm in the caudae epididymides by late August, indicating readiness to mate. Testes regression in male hoary bats coincided with enlargement of seminal vesicles and apparent growth of keratinized spines on the glans penis. Seasonality of these processes also suggests that mating could occur during August in L. cinereus. Spermatozoa were found in the uterus of an adult female hoary bat collected in September, but not in any other females. Ovaries of all females sampled had growing secondary or tertiary follicles, indicating sexual maturity even in first-year females. Lasiurus cinereus, L. borealis, and Ln. noctivagans are the only North American temperate bats in which most first-year young of both sexes are known to sexually mature in their first autumn. Our findings provide the first detailed information published on the seasonal timing of mating readiness in these species most affected by wind turbines.

Craig A. Stricker - One of the best experts on this subject based on the ideXlab platform.

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