Reproductive aspects of Dendropsophus sanborni (Anura, Hylidae) in northeastern Argentina

Abstract

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. KEYWORDS.Reproduction, vocalizations, gonads. RESUMEN. Aspectos reproductivos deDendropsophus sanborni (Anura, Hylidae) en el nordeste de la Argentina. El objetivo del presente estudio fue caracterizar aspectos reproductivos de Dendropsophus sanborni (Schmidt, 1944) (Anura, Hylidae) en la región noroeste de la provincia de Corrientes, al Nordeste de Argentina. Para esto, se analizó el ciclo gonadal de machos y hembras, la existencia de dimorfismo sexual y el periodo de vocalización de los machos. Los muestreos se efectuaron desde Septiembre de 2011 hasta Agosto de 2012. Dendropsophus sanborni exhibe un patrón reproductivo prolongado, dado que la actividad reproductiva ocurre durante gran parte del año. Se registraron machos en actividad de vocalización durante todos los meses excepto en julio. El ciclo espermatogénico puede ser caracterizado como potencialmente continuo. En los machos hubo correlación significativa entre la longitud hocico-cloaca y el volumen testicular medio. La especie presentó dimorfismo sexual en relación a la masa corporal, siendo las hembras mayores que los machos. Se encontraron hembras post-ovulatorias desde Marzo a Junio y una mayor proporción de hembras con ovocitos en diferentes estados de maduración, con abundantes ovocitos post-vitelogénicos, en los meses de Agosto a Diciembre.

Comportamento territorial, vocalização e biologia reprodutiva de Allobates olfersioides (Anura: Aromobatidae)

“…Sabe-se que a temperatura desempenha um papel importante na atividade de vocalização e comportamental destes animais (Santos et al, 2008;Canavero et al, 2009). Anuros que vivem em áreas tropicais podem estar ativos durante todo o ano e ter padrão de reprodução contínuo, porém, a precipitação é considerada o principal fator extrínseco associado à sua reprodução (Curi et al, 2014).…”

Aspectos reprodutivos de uma população de Physalaemus gracilis (BOULENGER 1883) (Anura: Leptodactylidae) do sul do Brasil

“…The specimens were later dissected in the ventral region and their sex was identified by gonadal assessment (Curi et al, 2014). The gonads from both sexes were re-moved in order to examine their anatomical aspects, using a stereomicroscope.…”

“…The temperature, rainfall and photoperiod are the main environmental factors involved in the regulation of the reproductive cycle of amphibians, influencing in the reproductive pattern, fecundity, development, and growth of embryos (Morrison and Hero, 2003;Toledo et al, 2003;Camargo et al, 2008, Curi et al, 2014Elgue and Maneyro, 2017). The high temperature may be the main factor that regulates the reproduction of P. riograndensis and Elachistocleis bicolor in Uruguayan populations (Pereira and Maneyro, 2012;Elgue and Maneyro, 2017).…”

Spatial and temporal distribution and microhabitat use of aquatic breeding amphibians (Anura) in a seasonally dry tropical forest in Chamela, Mexico

“…During the reproductive season, resource overlapping within the community becomes more intense (Bertoluci & Rodrigues, 2002), therefore species can exhibit temporal or spatial segregation or partial/complete overlap in the use of resources (Rossa-Feres & Jim, 2001). Temporal partitioning can be directly related to each region´s climate, particularly precipitation (Vasconcelos & Rossa-Feres, 2005;Curi, Céspedez, & Álvarez, 2014), since the unpredictability and the frequency of rains can limit temporal distribution of some amphibian species, by affecting the quantity and quality of aquatic environments used for reproduction (Bernarde & Anjos, 1999;Santos, Rossa-Feres, & Asatti, 2007).Tropical dry forest in the Chamela region, on the coast of Jalisco in Western Mexico, is characterized by a prolonged dry season, and a marked seasonality in rainfall, with most precipitation occurring from July to October (Bullock, 1986). Rainfall varies in intensity and frequency between years, being mainly associated with hurricanes and tropical storms (García-Oliva, Maass, & Galicia, 1995).…”

“…During the reproductive season, resource overlapping within the community becomes more intense (Bertoluci & Rodrigues, 2002), therefore species can exhibit temporal or spatial segregation or partial/complete overlap in the use of resources (Rossa-Feres & Jim, 2001). Temporal partitioning can be directly related to each region´s climate, particularly precipitation (Vasconcelos & Rossa-Feres, 2005;Curi, Céspedez, & Álvarez, 2014), since the unpredictability and the frequency of rains can limit temporal distribution of some amphibian species, by affecting the quantity and quality of aquatic environments used for reproduction (Bernarde & Anjos, 1999;Santos, Rossa-Feres, & Asatti, 2007).…”