Influence of torpor on milk protein composition and secretion in lactating bats

Wilde, Colin J.; Knight, Christopher H.; Racey, Paul A.

doi:10.1002/(sici)1097-010x(19990615)284:1<35::aid-jez6>3.0.co;2-z

Cited by 108 publications

(71 citation statements)

References 22 publications

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“…Similarly, Henry et al (2002) argue that the majority of nursing is likely to occur during the night, since lactating females cannot support high energy requirements of milk production during the day. The nightly use of body torpor as well as grooming behaviour is substantially reduced in lactating females in order to either diminish a negative effect on milk production (Wilde et al 1999;Dietz & Kalko 2006) or, to reduce energy expenditures (McLean & Speakman 1997), for the former and the later case, respectively. Thus, our reported lengths of nightly visits in roosts by lactating females may be addressed to approximate lengths of particular suckling events plus the time necessary for digesting of food acquired during previous foraging bout.…”

Section: Spatial Activity and Nightly Roost Visitationmentioning

confidence: 99%

Variability of foraging and roosting activities in adult females of Daubenton’s bat (Myotis daubentonii) in different seasons

Lučan

Radil

2010

Biologia

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We radio-tracked fifteen reproductive females (5 pregnant, 5 lactating, 5 in post-lactation) of the Daubenton's bat in summer 2005 in order to reveal the effect of reproductive state on their foraging and roosting activity. Spatial activity of females decreased from pregnancy to lactation and increased again in the post-lactation period. Overall time spent foraging did not differ among the three study periods. However, while pregnant and lactating females spent similar proportion of the night length foraging, females in the post-lactation period were foraging for shorter part of night. The frequency of nightly visits to roosts was highest during lactation but there was a trend towards shortening of particular visits during that period. All but one roost were in tree hollows excavated by woodpeckers in spatially restricted area of ca 0.7 km 2 . Tree cavities used during pregnancy were located higher on a tree trunk and had larger entrance area than the cavities used in the two later periods. Bats switched roosts every 2-3 days (range 1-8) and moved to a new roost up to 800 m apart. Pregnant females tended to switch roosts more frequently than females in the two later periods. We did not observe a significant effect of minimum nightly temperature on the activity of radio-tracked Daubenton's bats. Therefore, we suggest that observed seasonal changes in the pattern of behaviour of Daubenton's bat females were driven by their changing energetic demands rather than by some extrinsic factors (e.g. weather conditions).

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Section: Spatial Activity and Nightly Roost Visitationmentioning

confidence: 99%

Variability of foraging and roosting activities in adult females of Daubenton’s bat (Myotis daubentonii) in different seasons

Lučan

Radil

2010

Biologia

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“…Little is known about the use of torpor by phyllostomids (Speakman and Thomas 2003). But as torpor slows milk production, lactating females should be selected not to reduce their metabolism (Wilde et al 1999). In addition, young bats are altricial and can thermoregulate only to a limited extent.…”

Section: Female Point Of Viewmentioning

confidence: 99%

Mating system of a Neotropical roost-making bat: the white-throated, round-eared bat, Lophostoma silvicolum (Chiroptera: Phyllostomidae)

Dechmann

Kalko

König

et al. 2005

Behav Ecol Sociobiol

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The vast majority of bats strongly depend on, but do not make, shelters or roosts. We investigated Lophostoma silvicolum, which roosts in active termite nests excavated by the bats themselves, to study the relationship between roost choice and mating systems. Due to the hardness of the termite nests, roost-making is probably costly in terms of time and energy for these bats. Video-observations and capture data showed that single males excavate nests. Only males in good physical condition attracted females to the resulting roosts. Almost all groups captured from excavated nests were single male-multifemale associations, suggesting a harem structure. Paternity assignments based on ten polymorphic microsatellites, revealed a high reproductive success of 46% by nest-holding males. We suggest that the mating system of L. silvicolum is based on a resource-defense polygyny. The temperatures in the excavated nests are warm and stable, and might provide a suitable shelter for reproductive females. Reproductive success achieved by harem males appears to justify the time and effort required to excavate the nests. Reproductive success may thus have selected on an external male phenotype, the excavated nests, and have contributed to the evolution of an otherwise rare behavior in bats.

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“…Lowering body temperature can provide significant energy and water savings during cold ambient temperatures and food scarcity (Webb et al 1993). However, it may reduce rates of fetal and juvenile development through prolonged date of parturition or decreased milk production in pregnant and lactating females, respectively (Wilde et al 1999). Therefore, reproductive females optimize development by minimizing torpor ).…”

Section: Introductionmentioning

confidence: 99%

Population structure of Daubenton’s bats is responding to microclimate of anthropogenic roosts

Lučan

Hanák

2011

Biologia

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Roost microclimate plays an important role in the survival, growth and reproduction in microbats. Entering torpor is one of the main energy saving mechanisms commonly used by microbats. The use of torpor is affected by roost microclimate and seasonally differs between the two sexes in relation to their reproductive condition. Consequently, thermal properties of male and female roosts should differ. To test this hypothesis, we compared temperature parameters of two anthropogenic day roosts of Daubenton's bats with a different structure of the population inhabiting them. In accordance with our predictions, the roost occupied by a male-dominated colony was colder and more fluctuant than the maternity roost with a female-dominated population. However, using of the two roosts changed during the season in response to changing energetic demands of the two sexes. While males were almost absent in the warmer maternity roost during pregnancy and lactation, they appeared in this roost during the post-lactation when mating starts. In contrast, females did not use the colder (male) roost until the time of weaning of juveniles, i.e., the time when their thermoregulatory needs change and they may benefit from using colder roost. Our study provides the evidence that the same roost may be used by individuals of different sex and reproductive state in different periods of the year. Generalizations about roost selection without knowledge of temporal variation in roost use and microclimatic conditions should be taken with caution. Anthropogenic roosts may be advantageous to Daubenton's bats as these can provide a variety of suitable microclimates and/or more space for roosting than tree cavities.

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Influence of torpor on milk protein composition and secretion in lactating bats

Cited by 108 publications

References 22 publications

Variability of foraging and roosting activities in adult females of Daubenton’s bat (Myotis daubentonii) in different seasons

Variability of foraging and roosting activities in adult females of Daubenton’s bat (Myotis daubentonii) in different seasons

Mating system of a Neotropical roost-making bat: the white-throated, round-eared bat, Lophostoma silvicolum (Chiroptera: Phyllostomidae)

Population structure of Daubenton’s bats is responding to microclimate of anthropogenic roosts

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