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Oecologia

, Volume 168, Issue 1, pp 35–42 | Cite as

Effects of intraguild predators on nest-site selection by prey

  • Wen-San Huang
  • David A. Pike
Behavioral ecology - Original Paper

Abstract

Nest-site selection involves tradeoffs between the risk of predation (on females and/or nests) and nest-site quality (microenvironment), and consequently suitable nesting sites are often in limited supply. Interactions with “classical” predators (e.g., those not competing for shared resources) can strongly influence nest-site selection, but whether intraguild predation also influences this behavior is unknown. We tested whether risk of predation from an intraguild predator [the diurnal scincid lizard Eutropis (Mabuya) longicaudata] influences nest-site selection by its prey (the nocturnal gecko Gekko hokouensis) on Orchid Island, Taiwan. These two species putatively compete for shared resources, including invertebrate prey and nesting microhabitat, but the larger E. longicaudata also predates G. hokouensis (but not its hard-shelled eggs). Both species nested within a concrete wall containing a series of drainage holes that have either one (“closed-in”) or two openings (“open”). In allopatry, E. longicaudata preferred to nest within holes that were plugged by debris (thereby protecting eggs from water intrusion), whereas G. hokouensis selected holes that were open at both ends (facilitating escape from predators). When we experimentally excluded E. longicaudata from its preferred nesting area, G. hokouensis not only nested in higher abundances, but also modified its nest-site selection, such that communal nesting was more prevalent and both open and closed-in holes were used equally. Egg viability was unaffected by the choice of hole type, but was reduced slightly (by 7%) in the predator exclusion area (presumably due to higher local incubation temperatures). Our field experiment demonstrates that intraguild predators can directly influence the nest density of prey by altering maternal nest-site selection behavior, even when the predator and prey are active at different times of day and the eggs are not at risk of predation.

Keywords

Artificial habitat Interspecific competition Predation risk Temperature 

Notes

Acknowledgments

We are grateful to C.H. Chang and several volunteers for help in the field. Comments by Reid Tingley helped improve an earlier draft. Funding was provided by the Kuo Wu Hsiu Luan Culture and Education Foundation and the National Science Council, Taiwan (NSC96-2621-B-178-002-MY3). All experiments adhered to the animal care protocols of Pingtung County, Taiwan, and the animal experimental protocols of the National Museum of Natural Science, Taichung, Taiwan (Permit NMNSHP97-002).

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  1. 1.Department of ZoologyNational Museum of Natural ScienceTaichungTaiwan
  2. 2.School of Marine and Tropical BiologyJames Cook UniversityTownsvilleAustralia

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