Male reproductive patterns in nonhibernating bats

Krutzsch, Philip H.

doi:10.1530/jrf.0.0560333

Cited by 70 publications

(52 citation statements)

References 27 publications

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“…Male bats also exhibit diversity in the timing and frequency of their reproductive cycles annually. In some species this may be expressed in unique functional (dysynchronous) timing between primary and accessory sex glands (Krutzsch, 1979;Gopalakrishna & Sapkal, 1986).…”

Section: Introductionmentioning

confidence: 99%

Ultrastructure of the Secretory Epithelial Cells of the Bulbo-Urethral Glands (Cowper's gland) in the Indian Fruit Bat, Rousettus leschenaulti (Desmarest) During the Reproductive Cycle

2017

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SUMMARY:The present paper describes the ultrastructural characteristics of the bulbo-urethral gland (Cowper' glands) of the Indian fruit bat, R. leschenaulti during sexually inactive-breeding cycle. Cyclic histological changes during the seasonal breeding quiescence cycle are not well marked. There are no marked differences. The ultrastructural characteristic of the secretory epithelial cells of BulboUretrhal Gland gland have been studied during different phases of reproductive cycle. The secretory epithelial cells are characterized by the well-developed rough endoplasmic reticulum, extensive developed complexus golgiensis (Golgi apparatus) and mitochondria. Mitochondria with lamellate cristae are dispersed in the cytoplasm. Three different types of secretory granules can be identified on the basis of electron density. These granules are not of different types but they represent the different stages of granule maturation. The secretory products of bulbo-urethral gland of bat are released into lumen both by apocrine and merocrine modes. The functional significance of the secretions of the bulbo-urethral glands in reproduction is discussed.

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Section: Introductionmentioning

confidence: 99%

Ultrastructure of the Secretory Epithelial Cells of the Bulbo-Urethral Glands (Cowper's gland) in the Indian Fruit Bat, Rousettus leschenaulti (Desmarest) During the Reproductive Cycle

2017

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“…In species where females are polyoestrous, males exhibit extended reproductive activity; however, it is not clear if all the individuals are reproductively active during the whole year. In species with seasonal monoestry it is possible that there is a sexual synchrony of all the individuals in the population (Krutzsch 1979). According to Racey and Entwistle (2000), bats tend to show a range of annual patterns of reproduction, which vary in both the period of the year in which pregnancies occur, and their spacing, in relation to annual and seasonal climatic cycles, as well as the grade of synchrony of reproductive events within the population.…”

Section: Introductionmentioning

confidence: 99%

Reproduction of the large fruit-eating bat Artibeus lituratus (Chiroptera: Phyllostomidae) in a Brazilian Atlantic forest area

Duarte

Talamoni

2010

Mammalian Biology

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In this study we investigated the male testicular activity and the reproductive condition of females in relation to their external reproductive characteristics (pregnant, lactating, post-lactating) in the phyllostomid bat Artibeus lituratus (Olfers, 1818). Five hundred and twenty six individuals were examined (197 males and 329 females) in the period December 2001 to May 2003. Throughout the study most males displayed large scrotal testes. Thirty-three males were randomly selected for histological examination at various times throughout the year and were found to have spermatogenic testes. The reproductive characteristics of the females indicated that they were reproductively active mainly during the wet season. Pregnancy occurs at the end of the dry season and parturition in the wet season. Most individuals captured after this season, mainly the females, were sexually immature. Our results suggest a seasonal monoestrous reproductive pattern for the species; however, adult males being fertile throughout the year could suggest polyoestry. Seasonal polyoestry is a possibility. There was, however, no evidence that females had more than one pregnancy per year.

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“…Delayed implantation is the most common delay process and has been found in species in 7 distantly-related orders of mammals (Renfree & Calaby, 1981). Delayed fertilization (by spermatozoa stored in the uterus) is the norm in temperate-zone bats (Gustafson, 1979; Oxberry, 1979;Racey, 1982), and has also been recorded in several species of subtropical and tropical bats (Myers, 1977;Krutzsch, 1979). Post-implantation delayed develop¬ ment is the least common form of delay in mammals, and is known from only a few species of bats in the suborder Microchiroptera (Bradshaw, 1962;Fleming, 1971;Bernard & Meester, 1982; see also Racey & Swift, 1981).…”

Section: Introductionmentioning

confidence: 99%

Delayed development in Fischer's pygmy fruit bat, Haplonycteris fischeri, in the Philippines

Heideman¹

1989

Reproduction

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Summary. A long delay in post-implantation embryonic development was detected in Fischer's pygmy fruit bats (palaeotropical fruit bats of the suborder Megachiroptera), the first time such a delay has been demonstrated outside the bat suborder Microchiroptera. Samples of bats were obtained from the Philippines over 5 years, and reproductive tracts were preserved and examined using standard histological techniques. Most parous female pygmy bats were impregnated in June, within a few weeks of parturition, and the embryos underwent superficial implantation at the anterior end of the uterus contralateral to the previously gravid uterus. Shortly thereafter, the rate of embryonic growth slowed tremendously for up to 8 months. During the period of delay, the mean length of the embryoblast increased only from 280 \g=m\m to 520 \g=m\m. In March of the following year, the developmental rate increased, and the embryos completed development in the next 3 months. The 8-month delay gives these bats a gestation period of 11\m=.\5 months, the longest known in bats. Most nulliparous females become pregnant at an age of 3\p=n-\5months, and their embryos entered a similar delay that terminated in March or April, after 2\p=n-\6months of delay. Males showed signs of fertility throughout the entire year, but testis volume was highest during May, June and July, at about the time when most females become receptive.

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Male reproductive patterns in nonhibernating bats

Cited by 70 publications

References 27 publications

Ultrastructure of the Secretory Epithelial Cells of the Bulbo-Urethral Glands (Cowper's gland) in the Indian Fruit Bat, Rousettus leschenaulti (Desmarest) During the Reproductive Cycle

Ultrastructure of the Secretory Epithelial Cells of the Bulbo-Urethral Glands (Cowper's gland) in the Indian Fruit Bat, Rousettus leschenaulti (Desmarest) During the Reproductive Cycle

Reproduction of the large fruit-eating bat Artibeus lituratus (Chiroptera: Phyllostomidae) in a Brazilian Atlantic forest area

Delayed development in Fischer's pygmy fruit bat, Haplonycteris fischeri, in the Philippines

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