Oecologia

, Volume 171, Issue 2, pp 537–544 | Cite as

Isotopic niche mirrors trophic niche in a vertebrate island invader

  • Marlenne A. Rodríguez M.
  • L. Gerardo Herrera M.
Ecosystem ecology - Original research

Abstract

Caution for the indiscriminate conversion of the isotopic niche into ecologic niche was recently advised. We tested the utility of the isotopic niche to answer ecological questions on oceanic islands. We compared the isotopic niches of black rats (Rattus rattus) on two islands in the Gulf of California, Mexico: Farrallón de San Ignacio (FSI) and San Pedro Mártir (SPM). Both islands maintained several species of marine birds, but FSI is devoid of terrestrial vegetation and SPM has several species of terrestrial plants. We tested the hypothesis that rats on FSI have a narrower trophic niche due to its lower diversity of food items. We predicted a smaller variance in δ13C and δ15N values of rat muscle on FSI, and a lower use of marine birds as food on SPM. We also examined stomach contents of rats on both islands to validate the isotopic information. Variances in δ13C and δ15N values of black rats were lower on FSI, and the contribution of marine birds to the diet of rats was smaller on SPM. Stomachs in most rats collected on FSI contained only one or two types of food items, mostly marine birds and terrestrial invertebrates. In contrast, stomachs with only one type of food item were rare on SPM, and in most cases they contained three or more food types. Our findings showed that isotopic variance is a good approximation for trophic niche when comparing populations with access to an assemblage of preys with contrasting biological and isotopic diversity.

Keywords

Black rats Feeding habits Island ecology Rattus rattus SIAR 

Notes

Acknowledgments

We thank Carolina Valdespino, Vinicio Sosa, Alberto González and Enriqueta Velarde for their advice and help in the development of this study, Alfonso Aguirre and Araceli Samaniego from Conservación de Islas for their wonderful support, Ricardo González and Jorge Villavicencio for their assistance in the field work, and Donald L.Phillips and Richard Inger for their comments on the manuscript. The Consejo Nacional de Ciencia y Tecnología supported our work with a research grant to L.G.H.M. (#43343), and a scholarship to M.A.R. Sampling and landing permits were granted by the Wildlife General Direction (DGVS) of the Environment Ministry (SEMARNAT), and the Interior Ministry (SEGOB), respectively. We finally thank to the regional offices of the Islas del Golfo de California Natural Protected Area from the Comisión Nacional de Áreas Naturales Protegidas in Sonora and Sinaloa for allowing us the access to the islands.

References

  1. Arneson LS, MacAvoy SE (2005) Carbon, nitrogen, and sulfur diet–tissue discrimination in mouse tissues. Can J Zool 83:989–995CrossRefGoogle Scholar
  2. Bearhop S, Adam CE, Waldron S, Fuller RA, Macleod H (2004) Determining trophic niche width: a novel approach using stable isotope analysis. J Anim Ecol 73:1007–1012CrossRefGoogle Scholar
  3. Cassaing J, Derré C, Moussa I, Cheylan G (2007) Diet variability of Mediterranean insular populations of Rattus rattus studied by stable isotope analysis. Isot Environ Health Stud 43:197–213CrossRefGoogle Scholar
  4. Castillo-Guerrero JA, González Gómez R, Vizcaíno E, Guevara MA, Latofski M, Ventura J, Leal M (2009) Monitoreo de aves post-erradicación de ratas (Rattus rattus) en las islas Farallón de San Ignacio y San Pedro Mártir en el Golfo de California, México, 2009. Technical reportGoogle Scholar
  5. Caut S, Angulo E, Courchamp F (2008) Dietary shift of an invasive predator: rats, seabirds and sea turtles. J Appl Ecol 45:428–437PubMedCrossRefGoogle Scholar
  6. Clark DA (1982) Foraging behavior of a vertebrate omnivore (Rattus rattus): meal structure, sampling, and diet breadth. Ecology 63:763–772CrossRefGoogle Scholar
  7. DeNiro M, Epstein S (1978) Influence of diet on the distribution of carbon isotopes in animals. Geochim Cosmochim Acta 42:495–506CrossRefGoogle Scholar
  8. Donlan CJ, Wilcox C (2008) Diversity, invasive species and extinctions in insular ecosystems. J Appl Ecol 45:1114–1123CrossRefGoogle Scholar
  9. Flaherty EA, Ben-David M (2010) Overlap and partitioning of the ecological and isotopic niches. Oikos 119:1409–1416CrossRefGoogle Scholar
  10. Frick W (2007) Influences of island characteristics on community structure and species incidence of desert bats in near-shore archipelago, Baja California. PhD dissertation, Oregon State University, CorvallisGoogle Scholar
  11. González-Bernal MA, Mellink E, Payán-Esquerra C (2001) Cnemidophorus tigris y Urosaurus ornatus. Herpet Review 32:192–193Google Scholar
  12. González-Bernal MA, Mellink E, Fong-Mendoza JR (2002) Nesting birds of Farallón de San Ignacio, Sinaloa, México. Western Birds 33:254–257Google Scholar
  13. Grismer LL (2002) Amphibians and reptiles of Baja California, including its pacific islands and the islands in the sea of Cortes. University of California Press, Los AngelesCrossRefGoogle Scholar
  14. Hobson KA, Drever MC, Kaiser GW (1999) Norway rats as predators of burrow-nesting seabirds: insights from stable isotope analyses. J Wildl Manag 63:14–25CrossRefGoogle Scholar
  15. Hutchinson GE (1957) Concluding remarks: cold spring harbor symposium. Quant Biol 22:415–427CrossRefGoogle Scholar
  16. Kurle CM (2009) Interpreting temporal variation in omnivore foraging ecology via stable isotope modeling. Funct Ecol 23:733–744CrossRefGoogle Scholar
  17. Layman CA, Quattrochi JP, Peyer CM, Allgeier JE (2007) Niche width collapse in a resilient top predator following ecosystem fragmentation. Ecol Lett 10:937–944PubMedCrossRefGoogle Scholar
  18. Major HL, Jones IL, Charette MR, Diamond AW (2007) Variations in the diet of introduced Norway rats (Rattus norvegicus) inferred using stable isotope analysis. J Zool 271:463–468CrossRefGoogle Scholar
  19. Matich P, Heithaus MR, Layman CA (2011) Contrasting patterns of individual specialization and trophic coupling in two marine apex predators. J Anim Ecol 80:294–305PubMedCrossRefGoogle Scholar
  20. Mellink E, Orozco-Meyer A, Contreras B, González-Jaramillo M (2002) Observations on nesting seabirds and insular rodents in the middle Sea of Cortés in 1999 and 2000. Bull Southern Calif Acad Sci 101:28–35Google Scholar
  21. Newsome SD, Martinez del Rio C, Bearhop S, Phillips DL (2007) A niche for isotopic ecology. Front Ecol Environ 5:429–436Google Scholar
  22. Olsson K, Stenroth P, Nyström P, Granéli W (2009) Invasions and niche width: does niche width of an introduced crayfish differ from a native crayfish? Freshw Biol 54:1731–1740CrossRefGoogle Scholar
  23. Parnell A, Inger R, Bearhop S, Jackson AL (2010) Source partitioning using stable isotopes: coping with too much variation. PLoS One 5:e9672PubMedCrossRefGoogle Scholar
  24. Pisanu B, Caut S, Gutjahr S, Vernon P, Chapuis JL (2011) Introduced black rats Rattus rattus on Ile de la possession (Iles Crozet, Subantarctic): diet and trophic position in food webs. Polar Biol 34:169–180CrossRefGoogle Scholar
  25. Quillfeldt P, Schenk I, McGill RAR, Strange IJ, Masello JF, Gladbach A, Roesch V, Furness RW (2008) Introduced mammals coexist with seabirds at New Island, Falkland Islands: abundance, habitat preferences, and stable isotope analysis of diet. Polar Biol 31:333–349CrossRefGoogle Scholar
  26. Semmens BX, Ward EJ, Moore JW, Darimont CT (2009) Quantifying inter- and intra-population niche variability using hierarchical Bayesian stable isotope mixing models. PlosOne 4:e6187Google Scholar
  27. Stapp P (2002) Stable isotopes reveal evidence of predation by ship rats on seabirds on the Shiant Islands, Scotland. J Appl Ecol 39:831–840CrossRefGoogle Scholar
  28. Syväranta J, Jones RI (2008) Changes in feeding niche widths of perch and roach following biomanipulation, revealed by stable isotope analysis. Freshw Biol 53:425–434CrossRefGoogle Scholar
  29. Tershy BR, Breese D (1997) The birds of San Pedro Martir island, Gulf of California. Mexico. Western Birds 28:96–107Google Scholar
  30. Tershy BR, Breese D, Angeles-P A, Cervantes-A M, Mandujano-H M, Hernández-N E, Córdoba-A A (1992) Natural history and management of Isla San Pedro Martir, Gulf of California. Report to conservation International-Mexico, GuaymasGoogle Scholar
  31. Tieszen LL, Boutton TW, Tesdahl KG, Slade NA (1983) Fractionation and turnover of stable carbon isotopes in animal tissues: implications for δ13C analysis of diet. Oecologia 57:32–37CrossRefGoogle Scholar
  32. Vander Zanden HB, Bjorndal KA, Reich KJ, Bolten AB (2010) Individual specialists in a generalist population: results from a long-term stable isotope series. Biol Lett 6:711–714PubMedCrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Marlenne A. Rodríguez M.
    • 1
    • 2
  • L. Gerardo Herrera M.
    • 3
  1. 1.Instituto de Ecología, A.C.XalapaMexico
  2. 2.Grupo de Ecología y Conservación de Islas, A.C.EnsenadaMexico
  3. 3.Estación de Biología de Chamela, Instituto de BiologíaUniversidad Nacional Autónoma de MéxicoSan PatricioMexico

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