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1 December 2007 Prey Size Selection of Insular Lizards by Two Sympatric Predatory Bird Species
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Abstract

Size-related selection of insular lizards by two sympatric predatory bird species (Southern Grey Shrike and Eurasian Kestrel) was studied in an arid insular environment. The endemic lizard genus Gallotia was a key resource in the diet of both predators, constituting more than 50% of the total biomass. Shrikes captured smaller lizards than kestrels during all seasons (mean snout - vent length (SVL): 7.4 ±1.9 vs. 9.4 ± 2.1 cm respectively), presenting a sequential use of lizard sizes and avoiding potential competition. On the other hand, shrikes and kestrels showed the same seasonal variation pattern, capturing the largest lizards during their breeding periods (spring). Considering lizard availability, shrikes displayed less selective predation than kestrels in all seasons. Shrikes positively selected the medium lizard size (SVL: 5–10 cm) during the nestling period, but negatively selected the small lizard size (SVL: < 5 cm) in autumn and winter, probably due to an explosion of juvenile lizards. Lastly, kestrels appeared to be more selective, negatively choosing the small lizard size but positively selecting the largest ones all the year round (SVL: > 10 cm).

REFERENCES

1.

M. del Arco-Aguilar , J. R. Acebes-Ginovés , A. Rodriguez-Rodriguez , P. Padrón , O. Rodríguez-Delgado , P. L. Pérez-deFaz , W. Wildpret de la Torre 1997. Cormophytic vegetation of the Malpaís de La Rasca, Tenerife (Canary Islands). Fitosociologia 34: 159–170. Google Scholar

2.

R. Barrientos , E. Virgós 2006. Reduction of potential food interference in two sympatric carnivores by sequential use of shared resources. Acta Oecol. 30: 107–116. Google Scholar

3.

S. P. Blomberg , R. Shine 2000. Size-based predation by kookaburras (Dacelo novaeguineae) on lizards (Eulamprus tympanum: Scincidae): what determines prey vulnerability? Behav. Ecol. Sociobiol. 48: 484–489. Google Scholar

4.

R. P. Brown , V. Pérez-Mellado , J. Diego-Rasilla , J. A. Garcia , A. Naranjo , J. R. Speakman 1992. Individual and population energetics of a lizard on a Mediterranean islet. Oecologia 91: 500–504. Google Scholar

5.

J. C. Carracedo , M. Paterne , H. Guillou , F. J. Pérez Torrado , R. Paris , E. Rodriguez Badiola , A. Hansen 2003. [Radiometric records (14C Y K/AR) of El Teide and the Northwest Rift, Tenerife, Canary Islands]. Estudios Geol. 59: 15–29. Google Scholar

6.

J. Carrillo , E. C. Hernández , M. Nogales , G. Delgado , R. Garcia , T. Ramos 1994. Geographic variation in the spring diet of Falco tinnunculus L. on the islands of Fuerteventura and El Hierro (Canary Islands). Bonn. zool. Beitr. 45: 39–48. Google Scholar

7.

P. Chesson , N. Huntly 1997. The roles of harsh and fluctuating conditions in the dynamics of ecological communities. Am. Nat. 150: 519–553. Google Scholar

8.

D. Costantini , E. Bruner , A. Fanfani , G. Dell'Omo In press. Male-biased predation of western green lizards by Eurasian kestrel. Naturwissenschaften. Google Scholar

9.

D. Costantini , S. Casagrande , G. Di Lieto , A. Fanfani , G. Dell'Omo 2005. Consistent differences in feeding habitats between neighbouring breeding kestrels. Behaviour 142: 1409–1421. Google Scholar

10.

R. B. Craig 1978. An analysis of the predatory behaviour of the Loggerhead Shrike. Auk 95: 221–234. Google Scholar

11.

J. A. Díaz , L. M. Carrascal 1990. Regional distribution of the Mediterranean lizard: influence of habitat cues and prey abundance. J. Biogeogr. 18: 1–7. Google Scholar

12.

P. G. H. Evans , J. B. Evans 1980. The ecology of lizards on Praslin Island, Seychelles. J. Zool. 191: 171–192. Google Scholar

13.

J. T. Garcia , B. E. Arroyo 2005. Food-niche differentiation in sympatric Hen Circus cyaneus and Montagu's Harriers Circus pygargus. Ibis 147: 144–154. Google Scholar

14.

A. T. Gerstell , J. Bednarz 1999. Competition and patterns of resource use by two sympatric raptors. Condor 101: 557–565. Google Scholar

15.

A. Hernández 1995. Selective predation by Northern Shrikes on small mammals in a natural environment. J. Field Ornithol. 66: 236–246. Google Scholar

16.

E. Hernández , M. Nogales , A. Martin 2000. Discovery of a new lizard in the Canary Islands, with a multivariate analysis of Gallotia (Reptilia: Lacertidae). Herpetologica 56: 63–76. Google Scholar

17.

M. Hromada , L. Kuczyński , A. Kristin , P. Tryjanowski 2003. Animals of different phenotype differentially utilise dietary niche-the case of the Great Grey Shrike Lanius excubitor. Ornis Fennica 80: 71–78. Google Scholar

18.

D. Julien-Laferriere 1999. Foraging strategies and food partitioning in the neotropical frugivorous mammals Caluromys philander and Potos flavus. J. Zool. 247: 71–80. Google Scholar

19.

D. Lack 1946. Competition for food by birds of prey. J. Anim. Ecol. 15: 123–129. Google Scholar

20.

B. F. J. Manly , L. L. McDonald , D. L. Thomas 1993. Resource selection by animals. Statistical design and analysis for field studies. Chapman & Hall, London. Google Scholar

21.

J. Martin , P. López 1996. Avian predation on a large lizard (Lacerta lepida) found at low population densities in Mediterranean habitats: an analysis of bird diets. Copeia 1996: 722–726. Google Scholar

22.

A. Martin , J. A. Lorenzo 2001. [Birds from the Canarian Archipelago]. Lemus, La Laguna. Google Scholar

23.

M. V. Marzol Jaén 1988. [The rain: a natural resource for the Canaries]. Servicio de Publicaciones de la Caja General de Ahorros de Canarias, Santa Cruz de Tenerife. Google Scholar

24.

D. Masman , S. Daan , C. Dijkstra 1988. Time allocation in the Kestrel (Falco tinnunculus), and the principle of energy minimization. J. Anim. Ecol. 57: 411–432. Google Scholar

25.

J. F. McLaughlin , J. Roughgarden 1989. Avian predation on Anolis lizards in the northeastern Caribbean: an interisland contrast. Ecology 70: 617–628. Google Scholar

26.

M. Nogales , A. Valido 1999. Preliminary data on the structural relationships in two lacertid species of the genus Gallotia (Reptilia: Lacertidae) based on the skeleton. Vieraea 27: 217–222. Google Scholar

27.

M. Nogales , J. C. Rando , A. Valido , A. Martin 2001. Discovery of a living giant lizard, genus Gallotia (Reptilia: Lacertidae), from La Gomera, Canary Islands. Herpetologica 57: 169–179. Google Scholar

28.

J. M. Olesen , A. Valido 2003. Lizards as pollinators and seed dispersers: an island phenomenon. TREE 18: 177–181. Google Scholar

29.

D. P. Padilla , M. Nogales , A. J. Pérez 2005. Seasonal diet of an insular endemic population of Southern Grey Shrike Lanius meridionalis koenigi on Tenerife, Canary Islands. Ornis Fennica 82: 155–165. Google Scholar

30.

R. Probst , S. Wegleitner , R. Schmid 2003. Relationship of vertebrate prey size to transport mode and distance in the Northern Shrike. Wilson Bull. 115: 201–204. Google Scholar

31.

R. E. Savage 1931. The relation between the feeding of the herring off the east coast of England and the plankton of the surrounding waters. Fish. Invest. Ministry Agric. Food Fish. Ser. 2. 12: 1–88. Google Scholar

32.

T. W. Schoener 1974. Resource partitioning in ecological communities. Science 185: 27–39. Google Scholar

33.

T. W. Schoener 1982. The controversy over interspecific competition. Am. Sci. 70: 586–595. Google Scholar

34.

S. Siegel 1990. [Non parametric statistics for the behavioural sciences]. Trillas, Mexico. Google Scholar

35.

W. R. Telfer , D. M. J. Bowman 2006. Diet of four rock-dwelling macropods in the Australian monsoon tropics. Austral. Ecol. 31: 817–827. Google Scholar

36.

R. J. Whittaker , J. M. Fernández-Palacios 2007. Island Biogeography. Ecology, Evolution and Conservation. Oxford Univ. Press, Oxford. Google Scholar

37.

R. Yosef 1993. Prey transport by the Loggerhead Shrikes. Condor 95: 231–233. Google Scholar
David P. Padilla, Manuel Nogales, and Patricia Marrero "Prey Size Selection of Insular Lizards by Two Sympatric Predatory Bird Species," Acta Ornithologica 42(2), 167-172, (1 December 2007). https://doi.org/10.3161/068.042.0211
Received: 1 July 2007; Accepted: 1 October 2007; Published: 1 December 2007
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