Sperm Storage and Fertilization

Crichton, Elizabeth G.

doi:10.1016/b978-012195670-7/50008-4

Cited by 63 publications

(62 citation statements)

References 104 publications

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“…Racey (1975) also referred to factors that may be involved in the removal of spermatozoa from there storage organs, such as muscular contractions, enzymatic dissolution, phagocytosis by leucocytes or epithelial cells, or the active entry of sperm into the epithelial and subepithelial tissues. According to Crichton (2000) leucocytes are responsible for the removal of dead spermatozoa prior to and following ovulation while Mori & Uchida (1980) mentioned that while spermatozoa in the uterotubal junction appeared normal, those remaining in the uterus degenerated and were engulfed by a massive invasion of polymorphonuclear leucocytes. According to Racey (1975) bat species that store spermatozoa in the female tract are remarkably free of leucocytes.…”

Section: Sperm Storagementioning

confidence: 99%

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Reproduction of the banana bat, Neoromicia nanus, in Mpumalanga Province, South Africa, with a discussion on sperm storage and latitudinal effects on reproductive strategies

Merwe¹,

Stirnemann²

2007

South African Journal of Wildlife Research

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The banana bat, Neoromicia nanus, is characterized by seasonal monoestrous breeding. This study examined the reproductive timing and strategies used by N. nanus in the Province of Mpumalanga, South Africa. Male and female bats were histologically examined to determine their reproductive condition throughout the year. Spermatogenesis in the banana bat began in late September and spermatozoa were released into the caudae epididymides from late April to late July. Spermatozoa remained present in the caudae epididymides throughout August. Mating was initiated in May and ovulation and fertilization occurred at the beginning of August. Implantations first occurred during early August and parturition followed from late October to the end of November. Lactating females were found until mid January. In contrast to the same species in Malawi, it appears that in Mpumalanga no sperm storage takes place in females and occurs for only a short period in males. Reproductive timing was approximately one month earlier in Mpumalanga than in Malawi.

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Section: Sperm Storagementioning

confidence: 99%

“…More recently, families other than the Vespertilionidae and Rhinolophidae in which storage of sperm occur has been identified (see Crichton 2000). Sperm storage can last several months in both males and females of some species (Racey 1979).…”

Section: Introductionmentioning

confidence: 99%

Reproduction of the banana bat, Neoromicia nanus, in Mpumalanga Province, South Africa, with a discussion on sperm storage and latitudinal effects on reproductive strategies

Merwe¹,

Stirnemann²

2007

South African Journal of Wildlife Research

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“…But so have some species of tropical distribution as Lasiurus ega, Rhinopoma hardwickei, Scotophilus heathi and Hipposideros speoris [37]. The results found in L. Yerbabuenae indicate no sperm storage in the epididymis because, as soon as ends the mating period (May-June), the regression of epididymal and testicular tissue is observed, and sperm cells degenerate.…”

Section: Discussionmentioning

confidence: 73%

“…Sperm storage is a strategy that, some bat species have developed, to ensure fertilization, associated with different reproductive strategies, especially in those with different synchrony of gametogenic cycle in females and males, and temperate distribution [37]. But so have some species of tropical distribution as Lasiurus ega, Rhinopoma hardwickei, Scotophilus heathi and Hipposideros speoris [37].…”

Section: Discussionmentioning

confidence: 99%

Relationship Between the Amount of Subcutaneous Fat, Testicular Morphometry, Epididymis and Some Sperm Parameters in Leptonycteris yerbabuenae Bat Before, During and After Mating

Martínez–Coronel¹,

Alicia²,

Arenas‐Ríos³

2015

AVS

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Studies in reproductive age mammals show that the increase in fat content is inversely related to sperm quality in response to a decrease in testosterone levels. In turn the decrease in androgen concentration is related to morphophysiological involution in the testis and epididymis. However, the bat Leptonycteris yerbabuenae increases the body fat content previous the mating period, contrary to what was reported in most mammals. Therefore the aim of this study was to determine the importance of variation in fat content in L. yerbabuenae in relation to testicular and epididymal cycle; and sperm parameters. The results clearly show an increase in the fat content as it approaches the mating season. Also, there is an increase in the size of the testis and epididymis. In the post-mating months, both: fat and testis, decrease and the sperm cells were not presents. Leptonycteris yerbabuenae has a different behaviour to most mammals, accumulate fat while producing, transit and sperm storage could be happening. So, in this model, we must do studies that meet these processes emerging from that reported in other mammals.

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“…Examples include sperm storage and delayed development, including embryonic diapause (Racey, '79;Bernard and Cumming, '97;Crichton, 2000;Racey and Entwistle, 2000). Other interesting Heuser and Wislocki ('35) traits are even less broadly studied, including the occurrence of true menstruation and of post partum estrus .…”

Section: Methodsmentioning

confidence: 99%

Evolution of the placenta and associated reproductive characters in bats

Carter

Mess

2008

J Exp Zool Pt B

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Recent advances in molecular phylogenetics indicate that the order Chiroptera is monophyletic and that one of four lineages of microbats (Rhinolophoidea) shares a common origin with megabats. Against this background we undertook a comprehensive analysis of placental evolution in bats. We defined a range of characters and character states associated with female reproduction, early development, placentation and the neonate. These were then mapped on a preexisting hypothesis of bat relationships that represents the current view from molecular studies. Our purpose was threefold. First, on the assumption of bat monophyly, we wished to establish the stem species pattern of extant chiropterans. Secondly, we asked whether there are derived character conditions in support of a common origin for Rhinolophoidea and the megabats. Thirdly, we looked for evolutionary character transformations that characterize higher-level clades within Chiroptera, i.e. the megabats and the four lineages of microbats. The character condition occurring in the last common ancestor of Chiroptera was unequivocal for 21 of the 25 characters included in the analysis. The data did not offer support for a megabat-rhinolophoid clade or the implication that microbats are paraphyletic. However, analysis of early development, placentation and other reproductive parameters resulted in derived character conditions for the megabats as well as for each of the four major lineages of microbats.

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Sperm Storage and Fertilization

Cited by 63 publications

References 104 publications

Reproduction of the banana bat, Neoromicia nanus, in Mpumalanga Province, South Africa, with a discussion on sperm storage and latitudinal effects on reproductive strategies

Reproduction of the banana bat, Neoromicia nanus, in Mpumalanga Province, South Africa, with a discussion on sperm storage and latitudinal effects on reproductive strategies

Relationship Between the Amount of Subcutaneous Fat, Testicular Morphometry, Epididymis and Some Sperm Parameters in Leptonycteris yerbabuenae Bat Before, During and After Mating

Evolution of the placenta and associated reproductive characters in bats

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