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Güiña (Leopardus Guigna) Preys on Cavity-Nesting Nestlings Güiña (Leopardus Guigna) Depreda Polluelos De Aves Que Nidifi Can En Cavidades

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Güiña (Leopardus Guigna) Preys on Cavity-Nesting Nestlings Güiña (Leopardus Guigna) Depreda Polluelos De Aves Que Nidifi Can En Cavidades GÜIÑA PREYS ON CAVITY NESTERS 501 REVISTA CHILENA DE HISTORIA NATURAL Revista Chilena de Historia Natural 86: 501-504, 2013 © Sociedad de Biología de Chile NATURAL HISTORY NOTE Güiña (Leopardus guigna) preys on cavity-nesting nestlings Güiña (Leopardus guigna) depreda polluelos de aves que nidifi can en cavidades TOMÁS A. ALTAMIRANO1,2*, FELIPE HERNÁNDEZ3, MARIANO DE LA MAZA1,4 & CRISTIAN BONACIC1 1Fauna Australis Wildlife Laboratory, Department of Ecosystem and Environment, School of Agricultural and Forests Sciences, Pontifi cia Universidad Católica de Chile. CP 7820436, Chile 2The Peregrine Fund, 5668 W Flying Hawk Lane, ID 83709, Boise, Idaho, USA 3Department of Wildlife Ecology and Conservation, University of Florida, 110 Newins-Ziegler Hall, Gainesville, FL 32611-0430, USA 4National Forestry Service (CONAF), Protected Areas Management, Department of Biodiversity Conservation. CP 8330407, Chile *Corresponding author: [email protected] Predation has been a leading cause of nesting Thorn-tailed rayadito Aphrastura spinicauda failure among diverse species of birds, Gmelin 1789) have been documented as accounting for up to 90 % of nest failure in some secondary prey items within güiña’s diet (24 endangered populations (e.g., Cain et al. 2003). %, Sanderson et al. 2002, Freer 2004). Even Different types of predators, such as small/ though güiña has been suggested as primarily medium-sized mammals and birds, are able terrestrial, its ability to prey on birds inhabiting to impact the reproductive success of birds the overstory or large-trees coincides with the by preying on their nest contents (Rogers & well-developed tree climbing abilities displayed Caro 1998, Söderström et al. 1998, Purcell & by the species (Sanderson et al. 2002). Previous Verner 1999). Nevertheless, direct evidences of güiña diet studies have been focused mainly predation events has been poorly documented, on the identifi cation of bird remains to species highlighting the relevance to obtain original level (Sanderson et al. 2002, Freer 2004), not and reliable data about an ecological interaction differentiating between age classes (e.g., that may strongly impact bird populations and adults/nestlings birds). The latter could community structure, particularly in highly shed light into the effects of predation on the perturbed ecosystems. reproductive biology of temperate forest bird The vulnerable güiña (Leopardus guigna assemblages. Molina 1782), or kodkod cat, is one of the In this article, we report the fi rst records smallest (1.2-2.2 kg) felids in the world (Nowell of güiña attempting to prey upon cavity-nesting & Jackson 1996). It has a limited distribution, bird nestlings in the temperate forest of South restricted to a narrow strip within the temperate America. The study was conducted in an forests in south-central Chile and Argentina Andean landscape in the Araucanía district, (30-50 °S, 70-75 °W) (Redford & Eisenberg South-Central Chile (39º16’ S, 71º48’ W). 1992), inhabiting continuous and fragmented We identifi ed study sites in six independent forests (Gálvez et al. 2013). The güiña has been forests across an elevation gradient, from 271 described as a nocturnal carnivore (Hernández meters above sea level (masl) to 1063 masl. et al. Unpublished data), suggesting daily Sites were separated by a minimum linear activity synchronization with small rodents, distance of 1.6 km. Four sites represent early its primary prey item (up to 82 %; Dunstone et successional stages of forests at lowlands al. 2002, Correa & Roa 2005). Flightless (e.g., dominated by broadleaf species such as Roble Chucao tapaculo Scelorchilus rubecola Kittlitz beech Nothofagus obliqua (Mirb.) Oerst., 1830, Huet-huet Pteroptochos tarnii King 1831) Coigüe Nothofagus dombeyi (Mirb.) Oerst., and occasionally flying birds (e.g., Austral and Chilean laurel Laurelia sempervirens (Ruiz thrush Turdus falklandii Quoy & Gaimard 1824, & Pav.) Tul. The remaining two sites are old- 502 ALTAMIRANO ET AL. growth, conifer-broadleaf mixed forests at within seven independent photo sequences, higher altitudes dominated by Prince Albert’s two of them involving spotted güiñas (black- yew Saxegothaea conspicua Lindl., Chilean Tepa spots over buff or gray-brown coat) and a single Laureliopsis philippiana (Looser) Schodde, and melanistic individual (black coat) (Fig. 1). Coigüe. Seventy one percent of the predation attempts In winter 2010, 240 nest boxes (40 per site) were concentrated at night (i.e., 2100 to 0600 were installed in order to assess nest box use h), whereas only 29 % were registered at dawn by small cavity-nesting birds and mammals and dusk periods. This behaviour parallels (i.e., depth 17.1 cm; entrance hole diameter the species’ activity pattern described in other 3.1 cm). The nest boxes were systematically studies (Hernández et al. Unpublished data), placed in a grid, by hanging them from a which may correspond with the heightened tree branch 1.5 meters above ground and 25 activity of smalls mammals. meters apart. During two breeding seasons Previous studies investigating güiña diet (2010-2011 and 2011-2012), nest boxes were suggest the species’ preference to depredate monitored by direct observation and through flightless avian species that predominantly the use of camera traps to monitor the activity nest and forage close to the ground (e.g., S. of cavity users and identify potential nest rubecula) (Sanderson et al. 2002, Freer 2004). predators. Passive digital camera traps (i.e., However, we show evidence for güiña preying Reconyx®) were used to monitor activity at on nestlings of a “large-tree user” birds (as the 49 nest boxes. Cameras were set at each Thorn-tailed Rayadito, Díaz et al. 2005), box for 22 days resulting in 1,078 camera-trap supporting an opportunistic felid behaviour. days. Cameras were placed in front or beside Trees climbed by individual güiñas within this each box, programmed to operate 24 hours a study had a diameter at breast height (dbh) day, and visited for maintenance every 10 days. ranging from 5.4 to 7.5 cm. This differs from An independent predation attempt at a site was previous observations that report güiñas easily defi ned as a photo capturing the presence of a climbing trees with dbh > 8 cm (Sanderson et predator with at least one hour interval between al. 2002). sequences (Di Bitetti et al. 2006). Most predation attempts lasted less than Two secondary cavity nesting bird species two minutes (86 %, mean ± SD = 00:47 ± 0:41 used the nest boxes, mainly Thorn-tailed minutes, n = 6), except one (36:11 minutes). Rayadito and occasionally Southern House Theses attempts mainly affected nests in Wren (Troglodytes aedon Vieillot 1809). nestling stages, and only one occurred in the Additionally, three small mammal species post fl edging stage (empty nest box), possibly were recorded as nest box users: Monito del attracted by the fecal odor. Only the longest monte (Dromiciops gliroides Thomas 1894), güiña predation attempt was successful (14 Chilean Arboreal-rat (Irenomys tarsalis Philippi %), resulting in the capture of a single nestling 1900), and Long-tailed Rice Mice (Oligoryzomys from the box (Fig. 1). The individual güiña then longicaudatus Bennett 1832). Monito del attempted to capture another Rayadito nestling monte also was registered as a cavity-nesting from the same nest box but was unsuccessful. bird predator, along with Milvago chimango The limited predation success and time Vieillot 1816, Glaucidium nana King 1828, allocated to güiña predation attempts could Rattus rattus Linnaeus 1758 among others1. be explained by the depth dimension of nest We registered güiña activity in three of the boxes and their restricted entrance holes, study sites, with predation attempts only on which likely hampered the nestling captures. Thorn-tailed Rayadito nestlings. We detected In fact, the entrances of natural cavities used at least three different individuals of güiña for nesting -excluding fi ssures- in temperate forest are normally larger and/or less deep than nest boxes (TA Altamirano & JT Ibarra unpublished data), suggesting that real güiña 1 ALTAMIRANO TA, M DE LA MAZA & C BONACIC predation success may be underestimated (2011) Depredación de nidos de rayadito (Aphrastura as a result of the restricted artifi cial cavity/ spinicauda) en el bosque templado andino de Chile. X Congreso Chileno de Ornitología, Santiago, Chile. nest box dimensions. To estimate the real Boletín Chileno de Ornitología 17: 26. cavity-nesting predation success, it would be GÜIÑA PREYS ON CAVITY NESTERS 503 Fig. 1: Images of güiña predation attempts on nest boxes occupied by cavity-nesting birds. Spotted güiña trying to prey on a nest box (A); melanistic güiña attempting to capture a nestling (B); spotted güiña climbing a tree to approach a nest box; trying to catch a nestling; and capturing it (C-F). Imágenes de intentos de depredación de güiña sobre aves que utilizan cajas-nido. Güiña moteada tratando de depredar una caja-nido (A); güiña melánica intentando capturar un polluelo (B); güiña moteada escalando el árbol de la caja-nido; tratando de capturar un polluelo; y capturándolo (C-F). necessary to conduct experimental nest box are the implications for avian reproductive designs comparing different entrance size and biology and conservation? box depth, or even better, assessing directly the predation success of natural cavities showing different dimensions. Finally, as güiña ACKNOWLEDGEMENTS:We thank the Chilean Ministry of the Environment (FPA Projects 09-083-08, 09-078- predation events do not leave any distinct sign 2010, 9-I-009-12), The Peregrine Fund, Centre of Local on the nest box, at least with these dimension Development (CEDEL - Sede Villarrica PUC), Chilean and entrance diameter, studies using this Forest Service (CONAF). We especially thank J. Tomás Ibarra, Nicolás Gálvez, Alberto Dittborn, Gonzalo technique in temperate forest of South America Valdivieso, Antonio Hargreaves, Jerry Laker (Kodkod: should be cautious as not to overestimate Lugar de Encuentros), M. Venegas and R. Sanhueza (Guías- Cañe), Ricardo Timmerman, Mónica Sabugal, Cristina breeding success when counting missing Délano, Lahuen Foundation, Kawellucó Private Sanctuary, nestlings without predation evidence.
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