First record of the Lesser Snouted Treefrog Scinax nasicus (Cope, 1862) in Brazilian coast and new species records for the state of Rio Grande do Sul

Primeiro registro da perereca-de-banheiro Scinax nasicus (Cope, 1862) na costa do Brasil e novos registros para o estado do Rio Grande do Sul

D. A. Dalmolin F. O. Rosa M. D. Freire L. F. M. Fonte I. F. Machado C. N. Paula D. Loebmann E. Périco About the authors

Abstract

Herein, we provide new occurrence records of Scinax nasicus (Cope, 1862) for the state of Rio Grande do Sul, Southern Brazil. All new records here provide are located on Southern half of the state. Besides this, we provide the first record for species in Brazilian coastal zone. Those records improve considerably our knowledge regarding species distribution in Southern Brazil.

Keywords:
Brazil subtropical; Pampa Domain; Scinax ruber clade

Resumo

Aqui, nós fornecemos novos registros de ocorrência de Scinax nasicus (Cope, 1862) para o estado do Rio Grande do Sul, Sul do Brasil. Todos os novos registros aqui fornecidos estão localizados na metade sul do estado. Além disso, nós fornecemos o primeiro registro para a espécie na zona costeira brasileira. Esses registros melhoram consideravelmente o nosso conhecimento sobre a distribuição da espécie no Sul do Brasil.

Palavras-chave:
Brasil subtropical; Domínio do Pampa; clado Scinax ruber

Scinax nasicus (Cope, 1862) is morphologically characterized by having a flattened body, rounded snout in dorsal view and truncated in side view, and it has a relatively small body size (~35 mm CRC) by comparison with other species of the Scinax ruber clade (Pombal Junior et al., 1995Pombal JUNIOR, J.P., Haddad, C.F.B. and Kasahara, S., 1995. New species of (Anura: Hylidae) from Southeastern Brazil, with comments in the genus. ScinaxJournal of Herpetology, vol. 29, no. 1, pp. 1-6. http://dx.doi.org/10.2307/1565078.
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). Even so, species may be confounded with other sympatric species of S. ruber clade, such Scinax fuscovarius (Lutz, 1925), Scinax granulatus (Peters, 1871) and Scinax perereca (Pombal Junior et al., 1995Pombal JUNIOR, J.P., Haddad, C.F.B. and Kasahara, S., 1995. New species of (Anura: Hylidae) from Southeastern Brazil, with comments in the genus. ScinaxJournal of Herpetology, vol. 29, no. 1, pp. 1-6. http://dx.doi.org/10.2307/1565078.
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). When available, advertisement call is one of the more effective tools to confirm species identification once that it has shorter duration compose by a single note by comparison with their congeners.

Scinax nasicus is widely distributed in open areas of South America, including Atlantic Forest, Cerrado, Chaco, Pampa, and Pantanal domains (for example, Mato Grosso, Mato Grosso do Sul, southern Goiás, western Minas Gerais, São Paulo, Paraná, Rio de Janeiro, Santa Catarina and Rio Grande do Sul) (Frost, 2016Frost, D.R., 2016 [viewed 15 March 2016]. Amphibian species of the world: an online reference: version 6.0 [online]. New York: American Museum of Natural History. Available from: http://research.amnh.org/herpetology/amphibia/index.html
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), between 12° to 35° S latitude. At the political distribution point of view species has been recorded to North and Central Argentina, eastern Bolivia, Central, South-Southeastern Brazil, Paraguay, and extreme Northwestern Uruguay (Giménez and Gallego, 2000Giménez, C.R. and Gallego, F., 2000. Distribución geográfica de (Cope, 1862) (Anura: Hylidae). Scinax nasicaCuadernos de Herpetología, vol. 14, no. 2, pp. 169.; Salas and Di Tada, 2001Salas, N.E. and Di Tada, I.E., 2001. Geographic distribution: Scinax nasicus.Herpetological Review, vol. 32, no. 3, pp. 190-191.; Candioti et al., 2004Candioti, M.F.V., Lavilla, E.O. and Echeverría, D.D., 2004. Feeding mechanisms in two Treefrogs, and . Hyla nanaScinax nasicus (Anura: Hylidae)Journal of Morphology, vol. 261, no. 2, pp. 206-224. PMid:15216525. http://dx.doi.org/10.1002/jmor.10239.
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; Carezzano and Cabrera, 2010Carezzano, F.J. and Cabrera, M.R., 2010. Amphibia, Anura, Hylidae, (Cope, 1862): distribution extension. Scinax nasicusCheck List, vol. 6, no. 3, pp. 390-391.; Maneyro and Carreira, 2012Maneyro, R. and Carreira, S., 2012. Guia de anfíbios del Uruguay. Montevideo: Ediciones de la Fuga. 207 p.; Kwet et al., 2004Kwet, A., Aquino, L., Reichle, S., Silvano, D., Lavilla, E., Di Tada, I. and Langone, J., 2004 [viewed 24 November 2014]. Scinax nasicus: version 2014.3. The IUCN Red List of Threatened Species. Available from: www.iucnredlist.org; Frost, 2016Frost, D.R., 2016 [viewed 15 March 2016]. Amphibian species of the world: an online reference: version 6.0 [online]. New York: American Museum of Natural History. Available from: http://research.amnh.org/herpetology/amphibia/index.html
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). For the state of Rio Grande do Sul, previous records are known for the municipalities of Caçapava do Sul (Both et al., 2011Both, C., Melo, A.S., Cechin, S.Z. and Hartz, S.M., 2011. Tadpole co-occurrence in ponds: when do guilds and time matter? Acta Oecologica, vol. 37, no. 2, pp. 140-145. http://dx.doi.org/10.1016/j.actao.2011.01.008.
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), Itaqui (Giasson, 2001Giasson, L.O.M., 2001. Geographic distribution. Scinax nasica.Herpetological Review, vol. 32, no. 4, pp. 273.), Santa Maria (Cechin et al., 2002Cechin, S.Z., Santos, T.G., Kopp, K.A., Spies, M.R. and Trevisan, R., 2002. Scinax nasica. Herpetological Review, vol. 33, no. 3, pp. 222-222.), Alvorada, Esteio, Gravataí, Porto Alegre, and Triunfo (Fonte et al., 2013Fonte, L.F.M., Zank, C., Volkmer, G., Fusinatto, L.A., Freire, M.D. and Colombo, P., 2013. Anfíbios. In: J. LUTZEMBERGER. Fauna e flora da Reserva Biológica do Lami, ed. Porto Alegre: Secretaria Municipal do Meio Ambiente, pp. 1-308.). Herein, we provide a updated map of distribution for species in Rio Grande do Sul with new records unpublished so far. Also, a new record for coastal zone Brazil is here presented.

New records of Scinax nasicus were obtained throughout sampling fields carried out in the state of Rio Grande do Sul, Southern Brazil at three distinct campaigns, as follow. For confirm species identification we used Pombal Junior et al. (1995)Pombal JUNIOR, J.P., Haddad, C.F.B. and Kasahara, S., 1995. New species of (Anura: Hylidae) from Southeastern Brazil, with comments in the genus. ScinaxJournal of Herpetology, vol. 29, no. 1, pp. 1-6. http://dx.doi.org/10.2307/1565078.
http://dx.doi.org/10.2307/1565078...
and Maneyro and Carreira (2012)Maneyro, R. and Carreira, S., 2012. Guia de anfíbios del Uruguay. Montevideo: Ediciones de la Fuga. 207 p. as well as advertisement call of males recorded in field collections. On October 26, 2014, five specimens were found at Moinhos do Campo farm, municipality of Bom Retiro do Sul (29°34’38” S, 51°55’41” W). On November 6th, 2014, at the Monte Bonito, municipality of Pelotas (22°37’01” S, 64°93’66” W) two specimens were collected. Finally, on February 15th, 2016, at Ilha dos Marinheiros, municipality of Rio Grande (31°59’52.30” S, 52°06’06” W), three specimens were collected. Voucher specimens are deposited on the UFRGS Herpetological Collection (7103-7107) and Herpetological Collection at FURG (CHFURG 3213, 3214, 4447-4449). Collecting permits was authorized by Instituto Chico Mendes de Conservação da Biodiversidade (Licence Number 43658-1).

In addition to the sampling fields, we examined deposited material in the scientific collections of the state. We found S. nasicus specimens at Museu de Ciências e Tecnologia da Pontifícia Universidade Católica do Rio Grande do Sul (MCP) and Coleção Zoológica de Referência da Universidade Federal de Santa Maria (ZUFMS). Therefore, unpublished records were found to the municipalities of Canoas (MCP 8440), Dom Feliciano (ZUFSM 2918), Manoel Viana (UFRGS 4078, 4457-4460), Rosário do Sul (MCP 5718-5721, 5769) and Uruguaiana (MCP 7593-7595, 7597).

The new records here provided increases from seven to 15 the number of municipalities with confirmed presence of Scinax nasicus (Figure 1). Based on previous record for the state and species distribution in Uruguay (see Maneyro and Carreira, 2012Maneyro, R. and Carreira, S., 2012. Guia de anfíbios del Uruguay. Montevideo: Ediciones de la Fuga. 207 p.) western records should be considered predictable. Eastwards records, however, should be considered unexpected once that Rio Grande do Sul coastal plan ha