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Redalyc.Reproductive Biology of Pleurodema Guayapae (Anura Revista de Biología Tropical ISSN: 0034-7744 [email protected] Universidad de Costa Rica Costa Rica Alonso Valetti, Julián; Grenat, Pablo Raúl; Baraquet, Mariana; Ludovico Martino, Adolfo Reproductive biology of Pleurodema guayapae (Anura: Leptodactylidae: Leiuperinae) Revista de Biología Tropical, vol. 62, núm. 1, mayo, 2014, pp. 173-181 Universidad de Costa Rica San Pedro de Montes de Oca, Costa Rica Disponible en: http://www.redalyc.org/articulo.oa?id=44931382015 Cómo citar el artículo Número completo Sistema de Información Científica Más información del artículo Red de Revistas Científicas de América Latina, el Caribe, España y Portugal Página de la revista en redalyc.org Proyecto académico sin fines de lucro, desarrollado bajo la iniciativa de acceso abierto Reproductive biology of Pleurodema guayapae (Anura: Leptodactylidae: Leiuperinae) Julián Alonso Valetti, Pablo Raúl Grenat, Mariana Baraquet & Adolfo Ludovico Martino* Ecología, Departamento de Ciencias Naturales, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta Nacional N° 8 - km 601, (X5804BYA) Río Cuarto, Argentina; [email protected], [email protected], [email protected], [email protected] * Correspondence Received 11-II-2013. Corrected 20-VII-2013. Accepted 21-VIII-2013. Abstract: Pleurodema guayapae is a species that inhabits saline environments and semidesert zones from cen- tral Argentina. To date, the knowledge about the reproductive biology of this species is very poor, and our aim is to contribute to its knowledge with the description of some important reproductive aspects. For this, field work was undertaken in an area near to Patquía, La Rioja province. Sampling was undertaken during three summer periods (2006-2007; 2007-2008; 2008-2009) in Chamical-Patquía area, where we could find reproductively active populations. We observed and described breeding sites, type of clutch, process of foam nest construction, clutch and egg number and sizes, and hatching time and stage. Behaviour observations were performed from the time that males began to call until the pairs ended up the foam nests building, and layed the eggs. Additionally, one amplected pair was observed and filmed in the process of foam nest construction, and four amplectant pairs were collected and separatelly placed in plastic containers, for nests observations in the laboratory. Hatching time was based on three different foam nests of known age. We found that P. guayapae populations were acousti- cally active only after a rainfall. Its breeding sites were represented by ephemeral ponds of fresh water, product of rains. The males emitted their calls inside or outside these ponds. A detailed description of the foam nest construction process by both females and males was made. The clutches were in dome-shaped foam nest type of 6-9cm in diameter and 1-3cm in height, some of which were in communal nests. The nests had an average of 1 137 pigmented eggs. This species showed a short hatching time. Our results allow us to conclude that this species should be considered an extreme explosive breeder. Our results are discussed with others obtained for related species. Rev. Biol. Trop. 62 (1): 173-181. Epub 2014 March 01. Key words: communal nest, ephemeral environment, explosive breeder, foam nest construction. The reproductive mode in amphibians was The genus Pleurodema Tschudi (Lepto- defined by Salthe & Duellman (1973) as “a dactylidae: Leiuperinae) is distributed from combination of traits that includes oviposi- Panama throughout South America to Southern tion site, ovum and clutch characteristics, rate Chile and Argentina, and currently is represent- and duration of development, stage and size ed by 15 species (Cei, 1980; Valetti, Salas & of hatchling, and type of parental care, if Martino, 2009; Maciel & Nunez, 2010; Kolenc any”. Thirty-nine reproductive modes have et al., 2011; Faivovich et al., 2012). This genus been recorded for anurans around the world has very variable ovipositional modes. The egg- (Haddad & Prado, 2005). Altig & McDiarmind clutch structure in the Southern Chilean popu- (2007) provide a generalized framework for lations of P. thaul and P. bufoninum is strings diversity of amphibian eggs and ovipositional in water (Weigandt, Úbeda & Díaz, 2004). This modes and introduce a standardized terminol- egg-laying mode is accompanied by inguinal ogy for clutch structures. amplexus (Duellman & Veloso, 1977). P. thaul Rev. Biol. Trop. (Int. J. Trop. Biol. ISSN-0034-7744) Vol. 62 (1): 173-181, March 2014 173 of central and Northern Chile, P. bibroni, P. and this behaviour is described following Hödl kriegi and P. cordobae lay eggs in semisub- (1990, 1992). merged gelatinous eggs-masses (Valetti et al. To determine the number of eggs per foam 2009; Valetti, Otero, Grenat & Martino, 2011; nest, four amplectant pairs were collected and Faivovich et al., 2012). P. tucumanum lays eggs each pair was put into a plastic container so that in plate-like floating masses (Martori, Aún & nests could be obtained in the laboratory. All Vignolo, 1994). All other known Pleurodema eggs of these foam nests were counted. Hatch- species lay eggs in aquatic foam nest (Barrio, ing time was based on three different foam 1964; Hulse, 1979; Cei, 1980; Peixoto, 1982; nests of known age. The tadpoles were staged Hödl, 1992; Faivovich et al., 2012). according to Gosner (1960). Pleurodema guayapae inhabits saline Additionally, on the morning of 18 Janu- and dry Chacoan environments from Central ary 2009, data on foam nests were collected Argentina (Barrio, 1964; Cei, 1980; Ferraro in the field to describe the general aspect of & Casagranda, 2009). In addition, De la Riva the nests and eggs. The number of foam nests and Gonzales (1998) reported a population ten- in each pond was registered and height and tatively assigned to P. guayapae from the dry diameter of the nests were measured. One Chacoan areas of Santa Cruz, Bolivia. To date, foam nest was placed in 10% formalin solution the knowledge about the reproductive biology for morphometric description of its eggs. Egg of P. guayapae was only briefly described by diameters without the gelatinous capsule were measured using a Zeiss SR stereomicroscope Barrio (1964). Consequently, the aims of this with a micrometer to nearest 0.01mm. Eggs, investigation are: (1) to identify the breeding tadpoles and adult specimens are housed at the sites of the species; (2) to describe the process herpetological collection of the Department of of foam nest construction; (3) to determine Natural Sciences, National University of Río clutch and egg sizes, and (4) to identify the Cuarto, Argentina. time and stage of hatching. RESULTS MATERIALS AND METHODS Breeding sites of P. guayapae: Calling Field work was undertaken in an area and spawning activities were limited only to near to Patquía, La Rioja province, Argentina one night after ca. 30mm of rainfall during (23°26’S - 45°04’W) at 434m in elevation. a very short time. The calling activity began This arid environment was well-described by at 4.00am (immediately after the rain when Barrio (1964). After three summers of sam- the ponds were formed) and ended at 7.00am pling (2006-2007; 2007-2008; 2008-2009) in (sunrise). Two ponds were formed in sites Chamical-Patquía area (La Rioja province), we where water was stored after the rain. The could find reproductively active populations sizes of the two rain ponds were 15x4 and of Pleurodema guayapae. Field observations 40x4 meters (Fig. 1A) and a depth less than of breeding aggregations were made at dawn 25cm, with approximately 50 males calling of 18 January 2009 in two ephemeral ponds in each pond. The males emitted their calls of 60m2 and 160m2, respectively. Behaviour on stones in the pond, inside the pond near observations were performed from the time that the edge or outside the pond (Fig. 1B). The male individuals began to emit the advertise- amplexus in P. guayapae is axillary and the ment calls until the pairs ended up building the pairs were observed out of the water, near the foam nests and lay the eggs. One amplected edge of the pond or floating on the surface pair was observed and filmed in the process of of the water (Fig. 2A). Once the amplexus is the foam nest construction with a Canon Pow- formed and the pair is into the pond, starts the erShot S5 IS camera (at 30 frames per second), construction of the foam nest. 174 Rev. Biol. Trop. (Int. J. Trop. Biol. ISSN-0034-7744) Vol. 62 (1): 173-181, March 2014 Fig. 1. (A) Rain pond at which the breeding aggregations of Pleurodema guayapae were found. Patquía, La Rioja province, Argentine; (B) Male of Pleurodema guayapae performing his advertisement call outside of water. (Photos by J. Valetti). Fig. 2. Different phases and stages in the process of foam nest construction. (A) Rest phase. Amplectant pair of Pleurodema guayapae; (B) First stage of activity phase. The male places his feet between the thighs of the female; (C) Second stage of activity phase. The male beats the foam; (D) Third stage of activity phase. The male distributes the eggs in the foam nest with his legs. The arrow shows the open cloaca of the male. (Photos by J. Valetti). Process of foam nest construction: The that of the female (Fig. 2A). These rest phases construction of the foam nest has alternating are alternated by activity phases that can be phases of activity and rest (sensu Hödl, 1990). described in three stages. The first stage is In the rest phase, the pair floats immobile. The when the male immerses the feet in the water male is in axillary amplexus on the female between the thighs of the female and then the with his feet retracted and the cloaca above cloacae of both individuals are juxtaposed Rev. Biol.
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