Abstract
Reproductive aspects of Dendropsophus sanborni (Anura, Hylidae) in northeastern Argentina. The aim of this investigation was to characterize reproductive aspects of Dendropsophus sanborni (Schmidt, 1944) (Anura, Hylidae) in the northwest of Corrientes province, in northeastern Argentina. The reproductive cycles of males and females, the existence of sexual dimorphism and the male’s vocalization period were analyzed. Samplings were made from September 2011 to August 2012. Dendropsophus sanborni showed a prolonged reproductive pattern because reproductive activity was observed during most part of the year. Calling males were recorded all months except in July. The spermatogenic cycle can be characterized as potentially continuous. In males, snout-vent length was significantly correlated with mean testicular volume. The species showed sexual dimorphism in body mass, with females larger than males. Post-ovulatory females were found from March to June and most females had oocytes at different stages of maturity, with abundant post-vitellogenic oocytes from August to December.
Highlights
The reproductive biology of Neotropical anurans has been widely studied in Brazil by different authors in different species such as Leptodactylus fuscus, Lysapsus limellus (PeralTa De almeiDa PraDo & ueTanabaro, 2000), Scinax fuscomarginatus (ToleDo & HaDDaD, 2005), Phylomedusa azurea and Phylomedusa sauvagi
In order to increase the information about Neotropical anurans reproduction, the aim of this study was to characterize the reproduction of Dendropsophus sanborni (Anura, Hylidae) based on gonadal cycle analysis in males and females, considering the period of calling activity and the existence of sexual dimorphism
Spermatogenesis is regulated by an interaction between endogenous and environmental factors (Paniagua et al, 1990)
Summary
Anurans have a complex life cycle and show much greater diversity of reproductive modes than other groups of vertebrates (Duelman & Trueb, 1994) They are a very interesting taxon for reproductive biology studies. Knowledge in the reproductive biology is useful to understand the adaptations of organisms to different environments and provides information to determine the conservation status of wildlife species (basTos & HaDDaD, 2002) Environmental factors such as air temperature, photoperiod and rainfall determine the reproductive cycles of anurans (lofTs, 1974). In order to increase the information about Neotropical anurans reproduction, the aim of this study was to characterize the reproduction of Dendropsophus sanborni (Anura, Hylidae) based on gonadal cycle analysis in males and females, considering the period of calling activity and the existence of sexual dimorphism. The species chosen for the present study has a snout-vent length of approximately 20 mm, inhabits open areas, and breeds in lentic, temporary or permanent water bodies (ZaracHo et al, 2012)
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