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Predation of the Frog Elachistocleis Panamensis By DOI: 10.21068/c2018.v19n02a11 Nota Predation of the frog Elachistocleis panamensis by the spider Ancylometes bogotensis: first record Depredación del sapo Elachistocleis panamensis por la araña Ancylometes bogotensis: primer registro Gerson A. Salcedo-Rivera, José A. Fuentes-Mario and José Tovar-Márquez Abstract We record for the first time a predation event on a Panamá Humming Frog (Elachistocleis panamensis) by a Bogotá Giant Fishing Spider (Ancylometes bogotensis) in a tropical dry forest fragment in northern Colombia. We discuss aspects related to the predation behavior of A. bogotensis and some elements of E. panamensis as prey. Keywords. Amphibians. Ctenidae. Microhylidae. Predator-prey interaction. Spiders. Resumen Registramos por primera vez un evento de depredación del sapito de los termiteros (Elachistocleis panamensis) por la araña pescadora gigante (Ancylometes bogotensis) en un fragmento de bosque seco tropical en el norte de Colombia. Discutimos aspectos del comportamiento de depredación de A. bogotensis y algunos elementos de E. panamensis como presa. Palabras clave. Anfibios. Arañas. Ctenidae. Interacción depredador-presa. Microhylidae. 128 ┃ BIOTA COLOMBIANA 19 (2) - 2018 Salcedo-Rivera et al. Predation of the frog Elachistocleis panamensis by the spider Ancylometes bogotensis Introduction Methodology. We observed a fortuitous and already started arachnid-amphibian predation case during Small toads are potential prey and constitute an important nocturnal monitoring in the study area. We identified component in the diet of many predators (Diesel et al., the species in situ following previous knowledge and 2014; Rocha et al., 2014); some arthropods as chilopods, with support in Höfer & Brescovit (2000). We registered crustaceans, insects and arachnids are known to prey upon time, temperature and relative humidity using a digital them with distinct foraging methods (Menin et al., 2005; thermo-hygrometer (Max-Min Thermo Hygro & Clock; Barej et al., 2009; Maffei et al., 2010; Moura & Azevedo, 2011; Brixco®). The description of the predation event was Diesel et al., 2014; Pinto & Costa-Campos et al., 2017). made based on the place of sighting and the behavior of individuals during observation. Lastly, we took a Among arthropods, spiders are the most important and photograph with a digital camera. frequent predators of anurans (Barej et al., 2009; Zaracho, 2012; Foerster et al., 2017; Pinto & Costa-Campos et al., Results 2017). There exists broad documentation on anurophagy by spiders, with most of the reports being from the An individual of A. bogotensis was observed when it Neotropics (Maffei et al., 2010). Nonetheless, the impact of was preying upon an individual of E. panamensis at predation on amphibian populations remains unknown 21:41 h on November 28th, 2016 during the rainy season (Barej et al., 2009) because most instances of spider attacks (temperature: 27 °C; relative humidity: 82 %). on amphibians are based on fortuitous observations of single events (Menin et al., 2005; dos Santos, 2009). The predation case was recorded on a leaf of a shrub (≈0.40 m high) that was not identified, near a stream Toledo (2005) found 68 reports of anurans as prey of (≈2 m). The spider was holding the anuran with the invertebrates, from which approximately 48 % presented chelicerae sunk into its low-abdominal region and spiders as predators, especially of the families Pisauridae with the aid of the pedipalps (Figure 1). No distress or and Ctenidae (Moura & Azevedo, 2011). Ctenidae agonistic call was heard; the anuran did not attempt (Araneae) is composed by large nocturnal hunters (Barej to set itself free from the spider and it was paralyzed. et al., 2009) that abound in neotropical forests (Bhukal et al., 2015). These spiders are considered to be ambush predators (Maffei et al., 2009) because they wait for their prey to be close enough to capture it (Foerster et al., 2017), especially at the edge of water bodies (Bhukal et al., 2015). Here we report observations that constitute the first record of a predation event carried out by the spider Ancylometes bogotensis (Araneae: Ctenidae) on the frog Elachistocleis panamensis (Anura: Microhylidae) in Montes de María, Sucre, Colombia. Materials and methods Study area. Our observation was made in a tropical dry forest fragment in the municipality of Colosó (subregion of Montes de María), department of Sucre, Colombia Figure 1. Predation on Elachistocleis panamensis by Ancylometes bogotensis (9°31’53.555”N-75°20’53.027”W; 178 m a. s. l.). in a tropical dry forest fragment from Colosó, Sucre, Colombia. BIOTA COLOMBIANA 19 (2) - 2018 ┃ 129 DOI: 10.21068/c2018.v19n02a11 Salcedo-Rivera et al. Discussion next to water bodies or inundated ponds (Romero- The genus Ancylometes (Ctenidae) shows a varied diet Martínez & Lynch, 2012; Blanco-Torres et al., 2015)– that ranges from insects to small vertebrates such as fish, suggest that it is probably not a common prey. On tadpoles, frogs, toads and lizards (Bhukal et al., 2015). the other hand, previous and present data indicate Recently, A. bogotensis has been pointed as a predator on the important role of A. bogotensis as a generalist and the crab Poppiana dentata (Decapoda: Trichodactylidae) opportunistic predator, as pointed out by White (2015). (Bhukal et al., 2015), the fish Anablepsoides hartii (Cyprinodontiformes: Rivulidae) (Deacon et al., 2015) and the toad Rhinella beebei (Anura: Bufonidae) (White, 2015). Acknowledgements The observed behavior of nocturnal predation on The present predation case was observed during leaves near bodies of water and the use of chelicerae practice phase of ‘Curso de introducción al estudio de los and pedipalps to hold prey coincide with the published anfibios y reptiles de la región Caribe, Colombia’, organized literature on the subject for A. bogotensis, the genus by Grupo de Investigación Biología Evolutiva (Universidad Ancylometes and other members of Ctenidae (Menin et de Sucre; Sincelejo, Colombia). We thank Alejandro al., 2005; Barej et al., 2009; Santana et al., 2009; Maffei et Cabrejo (course instructor) and Cristian Castillo al., 2010; Moura & Azevedo, 2011; Bhukal et al., 2015; for their help in identifying the amphibian, Rocío Foerster et al., 2017; Pinto & Costa-Campos et al., 2017). Seisdedos and Diego Gómez for their very helpful comments on the manuscript, and Yamil Hanna for Also, the paralysis of E. panamensis during the reviewing the translation. observed predation by A. bogotensis agrees with previous records of predation by species of the Ctenidae family (Maffei et al., 2010; Foerster et al., References 2017; Pinto & Costa-Campos et al., 2017); for example, the poison of Ancylometes rufus is known to have a Barej, M. F., Wurstner, J. A. M. & Böhme, W. (2009). rapid effect, for it may immobilize an individual of Predation on the treefrog Leptopelis brevirostris Dendropsophus brevifrons in 45 seconds (Pinto & Costa- (Anura: Arthroleptidae) by a wandering spider Campos et al., 2017). (Araneae: Ctenidae) in Cameroon. Herpetology Notes, 2, 137-139. Elachistocleis panamensis is a small microhylid with a Bhukal, R., Rutherford, M. G. & Mohammed, R. S. restricted distribution in central Panamá, the lowlands (2015). Predation on a freshwater crab, Dilocarcinus of the Magdalena River valley and the Caribbean region dentatus (Trichodactylidae), by several tropical wolf in Colombia (Blanco-Torres et al., 2015). It is classified spiders, Ancylometes bogotensis (Ctenidae), in Trini- in the trophic guild of the insectivorous with nocturnal dad, W.I. Living World, Journal of The Trinidad and and terrestrial habits (Blanco-Torres & Renjifo, 2014). Tobago Field Naturalists’ Club, 59-60. This frog is a little-known species, and information on Blanco-Torres, A. & Rengifo, J. M. (2014). Herpetofauna its life history is scarce (Vera-Candioti, 2006; Blanco- de Cerrejón. In Báez, L. & Trujillo, F. (Eds.). Biodi- Torres et al., 2015). versidad en Cerrejón. Pp. 150-169. Bogotá, D. C., Co- lombia: Carbones de Cerrejón, Fundación Omacha, The small size of E. panamensis is relevant for the Fondo para la Acción Ambiental y la Niñez. current predation case because allows the species to Deacon, A. E., Farrell, A. D. & Fraser, D. F. (2015). Ob- be an easy prey of invertebrates (Guerra-Batista et al., servation of a semi-aquatic spider attack: An over- 2013; Foerster et al., 2017). Nevertheless, the fossorial looked fish predator in a well-studied ecosystem? behavior along with the remarkably seasonal nature of Living World, Journal of The Trinidad and Tobago Field this frog it is only found after heavy rains, vocalizing Naturalists’ Club, 57-59. 130 ┃ BIOTA COLOMBIANA 19 (2) - 2018 Salcedo-Rivera et al. Predation of the frog Elachistocleis panamensis by the spider Ancylometes bogotensis Diesel, A., da Rosa, C. M. & Malta, L. (2014). Preda- Pinto, R. O & Costa-Campos, C. E. (2017). Predation on tion of Dendropsophus minutus (Anura: Hylidae) by Dendropsophus brevifrons (Duellman & Crump, 1974) Aglaoctenus oblongus (Aranae: Lycosidae). Herpeto- (Anura: Hylidae) by the giant fishing spiderAncylo - logy Notes, 7, 605-606. metes rufus (Walckenaer, 1837) (Araneae: Ctenidae). dos Santos, E. M. (2009). Notas sobre predação de anu- Alytes, 33, 55-57. ros em uma poça temporária no nordeste do Bra- Rocha, R., Almeida, T. & López-Baucells, A. (2014). sil. Boletim do Museo de Biologia Mello Leitão (n.s.), Field observation of an adult Lesser treefrog Den- 25, 77-82. dropsophus minutus (Anura: Hylidae) being consu- Foerster,
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