Contribuição ao conhecimento da biologia reprodutiva de Molossus molossus Pallas, 1766) (Chiroptera, Molossidae)

Fabián, Marta Elena; Marques, Rosane Vera

doi:10.1590/s0101-81751989000400005

Cited by 18 publications

(16 citation statements)

References 10 publications

(2 reference statements)

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“…This secretion accumulates and increases the lumen in the dry season, being released during the main reproductive period (early rainy season). As the main reproductive peak of M. molossus occurs in spring (early rainy season; Fabián and Marques 1989), the secretion would be released during this period, resulting in smaller lumens, nuclear areas and perimeters during this season. Morais et al (2013) obtained similar results for the testes of the bat M. molossus.…”

Section: Seasonal Evaluationmentioning

confidence: 99%

“…It is the most common bat in the urban areas of Brazil. It is known to be polyestric with two annual reproductive breeding seasons in Brazil, one in March-April and another in November, and sexually active males are found almost year round (Fabián and Marques 1989;Beguelini et al 2010Beguelini et al , 20122013a;Morais et al 2012Morais et al , 2013. However, information about the reproductive process in males is still scarce.…”

Section: Introductionmentioning

confidence: 99%

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Structure, histochemistry and seasonal variations of the male reproductive accessory glands in the Pallas’s mastiff bat, Molossus molossus (Chiroptera: Molossidae)

Christante

Beguelini

Puga

et al. 2015

Reprod. Fertil. Dev.

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Due to their wide geographical distribution, bats suffer considerable influence from abiotic factors on their reproductive strategies, detected through behavioural or functional assessment of the gonads and accessory glands. The present study aimed to characterise anatomically and morphologically the reproductive accessory glands (RAGs) of Molossus molossus (Molossidae) and evaluate their seasonal variations. The RAGs were removed, fixed, sectioned after histological processing and submitted to the following stains: haematoxylin-eosin, periodic acid--Schiff (PAS) and Gömöri's reticulin. Our data demonstrated that the RAGs of M. molossus are composed of a semi-lobed prostatic complex associated with the urethra and a pair of inguinal bulbourethral glands. Histology and three-dimensional reconstruction of the prostatic complex demonstrated the existence of two regions: ventral and dorsal (named according to the position around the urethra). The two regions had distinctive morphological and histological differences, with the ventral region being the most prominent and the dorsal formed by four lobes. Considering the seasonal evaluation, we can infer that the prostatic complex of M. molossus is active throughout the seasons in São Paulo State (Brazil) and, although each of the prostatic regions has inherent characteristics, they synchronise to establish the main reproductive peak in spring (early rainy season).

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Section: Seasonal Evaluationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structure, histochemistry and seasonal variations of the male reproductive accessory glands in the Pallas’s mastiff bat, Molossus molossus (Chiroptera: Molossidae)

Christante

Beguelini

Puga

et al. 2015

Reprod. Fertil. Dev.

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“…This species has a reproductive cycle defined as seasonal polyestrous by Fabian and Marques (1989) in northeastern Brazil, and as seasonal monoestral by Pacheco (2001) in the southern region of the country. The reproductive behaviour of M. molossus seems to be similar to other insectivorous bats, which have a typically monoestral reproductive pattern, but when food availability are not subject to seasonal variations, they can reproduce poliestrically, with peak birth twice a year (Fleming et al, 1972;LaVal and Fitch, 1977).…”

Section: Introductionmentioning

confidence: 99%

Seasonal variation of energy reserves and reproduction in neotropical free-tailed bats Molossus molossus (Chiroptera: Molossidae)

et al. 2013

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Seasonal variation is a key factor regulating energy metabolism and reproduction in several mammals, including bats. This study aimed to track seasonal changes in the energy reserves of the insectivorous bat Molossus molossus associated with its reproductive cycle. Adult males were collected during the four neotropical annual seasons in Viçosa -MG, Brazil. Blood and tissues were collected for metabolic analysis and testes were removed for histology and morphometry. Our results show that liver and breast muscle glycogen concentrations were significantly lower in winter. The adiposity index was significantly higher in the fall compared to winter and spring. Seminiferous tubules were greater in diameter in animals captured in fall and winter, indicating a higher investment in spermatic production during these seasons. The percentage of Leydig cells was higher in summer compared to fall and winter. We suggest that M. molossus presents a type of seasonal reproduction with two peaks of testicular activity: one in fall, with higher sperm production (spermatogenesis), and another in summer, with higher hormone production (steroidogenesis). The metabolic pattern may be associated with reproductive events, especially due to the highest fat storage observed in the fall, which coincides with the further development of the seminiferous tubules.Keywords: spermatogenesis, histology, insectivorous, males, metabolism. Variação sazonal das reservas energéticas e a reprodução do morcego neotropical de cauda livre Molossus molossus (Chiroptera: Molossidae) ResumoA variação sazonal é um fator chave na regulação do metabolismo energético e da reprodução em vários mamíferos, incluindo os morcegos. O objetivo deste estudo foi avaliar as reservas energéticas do morcego insetívoro Molossus molossus ao longo das estações anuais associadas ao seu ciclo reprodutivo. Foram coletados machos adultos durante as quatro estações anuais na cidade de Viçosa -MG, Brasil. Para as análises metabólicas foram coletados tecidos e sangue, e os testículos foram removidos para análises histológicas e morfométricas. Os resultados mostram que as concentrações de glicogênio no fígado e músculo peitoral foram significativamente menores no inverno. O índice adiposo foi significativamente maior no outono em relação ao inverno e primavera. Os túbulos seminíferos apresentaram maiores diâmetros nos animais coletados no outono e inverno, indicando um maior investimento na produção espermática durante estas estações. A porcentagem de células de Leydig foi maior no verão em comparação com outono e inverno. Sugere-se que M. molossus apresenta um tipo de reprodução sazonal com dois picos de atividade testicular: uma no outono, com maior produção de espermatozóides (espermatogênese), e outra no verão, com maior produção de hormônio (esteroidogênese). O padrão metabólico pode estar associado a eventos reprodutivos, especialmente devido ao maior armazenamento de gordura observado no outono, que coincide com o desenvolvimento dos túbulos seminíferos.Palavras-chave: e...

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“…Based on our study, we believe that the same might happen to male S. lilium in the state of Rio de Janeiro. Some authors say that testes location is not a good indicator of male reproductive activity, since the spermatic activity is continuous (Fabián and Marques, 1989;Moraes, 2008). Other authors suggest the use of other external indicators of active reproduction, such as behavior, glands, and odors Mello et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

Reproductive biology of the bat Sturnira lilium (Chiroptera, Phyllostomidae) in the Atlantic Forest of Rio de Janeiro, southeastern Brazil

2014

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Bats can be monoestrous or polyestrous, and seasonal or non-seasonal in their reproductive patterns. The strategy adopted by each species or population depends on the regional climate. The objective this study was to analyze reproductive data of Sturnira lilium from long-term sampling carried out in several sites in Rio de Janeiro states, southeastern Brazil. We carried out sampling in 42 sites (with altitudes ranging from sea level to 1300 m a.s.l.) from May 1989 to December 2011. In total, we obtained 2602 captures of S. lilium: 1242 captures of adult females, 1225 captures of adult males, and 136 captures of subadults. The sex ratio was 0.99 males: 1 female. The reproductive season varied from eight to twelve months a year, and it was not related to the total accumulated rainfall. Sturnira lilium have continuously polyestrous reproduction with postpartum estrus and pregnant females can be observed in all months except July. In the present study, the highest proportions of pregnant females were observed in the months with the highest rainfall.Keywords: seasonality, reproductive season, rain influence, Atlantic Forest, Rio de Janeiro. Biologia reprodutiva do morcego Sturnira lilium (Chiroptera, Phyllostomidae), na Floresta Atlântica do Rio de Janeiro, sudeste do Brasil ResumoOs morcegos podem ser monoestrais ou poliestrais e sazonais ou assazonais em relação aos padrões reprodutivos. A estratégia adotada por cada espécie ou população depende do clima regional. O objetivo deste estudo foi analisar os dados reprodutivos de Sturnira lilium em amostragem de longo prazo realizado em diversos locais do Estado do Rio de Janeiro, sudeste do Brasil. De maio de 1989 a dezembro de 2011, realizamos amostragens em 42 locais (com altitudes que variam de 0 a 1300 m de altitude). No total, obteve 2602 capturas de S. lilium: 1242 fêmeas adultas, 1225 machos adultos e 136 subadultos. A proporção sexual foi 0.99 machos: 1 fêmea. A temporada reprodutiva variou de oito a doze meses por ano e não foi relacionada com o total de precipitação acumulada. Sturnira lilium apresenta reprodução contínua poliéstrica com estro pós-parto e fêmeas grávidas podem ser observadas em todos os meses, exceto o mês de julho. No presente estudo, as maiores proporções de fêmeas grávidas ocorreram nos meses com maior precipitação.Palavras-chave: estacionalidade, época reprodutiva, influência da chuva, Mata Atlântica, Rio de Janeiro.

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Contribuição ao conhecimento da biologia reprodutiva de Molossus molossus Pallas, 1766) (Chiroptera, Molossidae)

Abstract: ABSTRACT

Cited by 18 publications

References 10 publications

Structure, histochemistry and seasonal variations of the male reproductive accessory glands in the Pallas’s mastiff bat, Molossus molossus (Chiroptera: Molossidae)

Structure, histochemistry and seasonal variations of the male reproductive accessory glands in the Pallas’s mastiff bat, Molossus molossus (Chiroptera: Molossidae)

Seasonal variation of energy reserves and reproduction in neotropical free-tailed bats Molossus molossus (Chiroptera: Molossidae)

Reproductive biology of the bat Sturnira lilium (Chiroptera, Phyllostomidae) in the Atlantic Forest of Rio de Janeiro, southeastern Brazil

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