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Oecologia

, Volume 144, Issue 2, pp 206–213 | Cite as

Effects of food supplementation on the physiological ecology of female Western diamond-backed rattlesnakes (Crotalus atrox)

  • Emily N. Taylor
  • Michael A. Malawy
  • Dawn M. Browning
  • Shea V. Lemar
  • Dale F. DeNardo
Ecophysiology

Abstract

Food availability is an important factor in the life histories of organisms because it is often limiting and thus can affect growth, mass change, reproduction, and behaviors such as thermoregulation, locomotion, and mating. Experimental studies in natural settings allow researchers to examine the effects of food on these parameters while animals are free to behave naturally. The wide variation among organisms in energy demands and among environmental food resources suggest that responses to changes in food availability may vary among organisms. Since most supplemental feeding field experiments have been conducted on species with high energy demands, we conducted a supplemental feeding study on free-ranging, female Western diamond-backed rattlesnakes (Crotalus atrox), a species with low energy demands and infrequent reproductive investment. Snakes were offered thawed rodents 1–4 times per week. Over two active seasons, we collected data on surface activity, home range size, growth, mass change, and reproduction of supplementally fed and control snakes. Fed and control snakes did not differ in surface activity levels (proportion of time encountered above versus below ground) or home range size. Fed snakes grew and gained mass faster, and had a dramatically higher occurrence of reproduction than control snakes. Also, fed snakes were in better body condition following reproduction than snakes that were not fed. However, litter characteristics such as offspring number and size were not increased by feeding, suggesting that these characteristics may be fixed. These data experimentally demonstrate that food availability can directly impact some life history traits (i.e., growth and reproduction for C. atrox), but not others (i.e., surface activity and home range size for C. atrox). The relationship between food availability and life history traits is affected in a complex way by ecological traits and physiological constraints, and thus interspecific variation in this relationship is likely to be high.

Keywords

Reproduction Energy Growth Snake 

Notes

Acknowledgements

Numerous people helped collect snakes in the field, including X. Bonnet, T. Brennan, O. Lourdais, J. Miller, and J. Slone, and especially M. Feldner. This manuscript was improved by critical comments from C. Christel, J. Davis, O. Lourdais, M. Moore, J. Sabo, and G. Walsberg. This study was funded by an Arizona State University Faculty Grant-in-Aid Award (to DFD), an Arizona State University Biology Research Experience for Undergraduates Program Fellowship (to MAM), and a National Science Foundation Graduate Research Fellowship (to ENT). The experiments in this study comply with the current laws of the United States of America.

References

  1. Abell AJ (1999) Variation in clutch size and offspring size relative to environmental conditions in the lizard Sceloporus virgatus. J Herpetol 33:173–180CrossRefGoogle Scholar
  2. Banks PB, Dickman CR (2000) Effects of winter food supplementation on reproduction, body mass, and numbers of small mammals in montane Australia. Can J Zool 78:1775–1783CrossRefGoogle Scholar
  3. Beaupre SJ (2002) Modeling time–energy allocation in vipers: individual responses to environmental variation and implications for populations. In: Schuett GW, Hoggren M, Douglas ME, Greene HW (eds) Biology of the vipers. Eagle Mountain Publishing, Eagle Mountain, pp 463–481Google Scholar
  4. Beaupre SJ, Duvall D (1998) Variation in oxygen consumption of the western diamondback rattlesnake (Crotalus atrox): implications for sexual size dimorphism. J Comp Physiol B 168:497–506CrossRefGoogle Scholar
  5. Beaupre SJ, Duvall D, O’Leile J (1998) Ontogenetic variation in growth and sexual size dimorphism in a central Arizona population of the western diamondback rattlesnake (Crotalus atrox). Copeia 1998:40–47CrossRefGoogle Scholar
  6. Beck DD (1995) Ecology and energetics of three sympatric rattlesnake species in the Sonoran Desert. J Herpetol 29:211–223CrossRefGoogle Scholar
  7. Blouin-Demers G (2003) Precision and accuracy of body-size measurements in a constricting, large-bodied snake (Elaphe obsoleta). Herpetol Rev 34:320–323Google Scholar
  8. Blouin-Demers G, Weatherhead PJ (2001) An experimental test of the link between foraging, habitat selection and thermoregulation in black rat snakes Elaphe obsoleta obsoleta. J Anim Ecol 70:1006–1013CrossRefGoogle Scholar
  9. Blouin-Demers G, Prior KA, Weatherhead PJ (2002) Comparative demography of black rat snakes (Elaphe obsoleta) in Ontario and Maryland. J Zool 256:1–10CrossRefGoogle Scholar
  10. Bonnet X, Shine R, Naulleau G, Thiburce C (2001a) Plastic vipers: influence of food intake on the size and shape of Gaboon vipers (Bitis gabonica). J Zool 255:341–351CrossRefGoogle Scholar
  11. Bonnet X, Naulleau G, Shine R, Lourdais O (2001b) Short-term versus long-term effects of food intake on reproductive output in a viviparous snake Vipera aspis. Oikos 92:297–308CrossRefGoogle Scholar
  12. Boutin S (1990) Food supplementation experiments with terrestrial vertebrates—patterns, problems, and the future. Can J Zool 68:203–220CrossRefGoogle Scholar
  13. Brommer JE, Karell P, Pietiainen H (2004) Supplementary fed Ural owls increase their reproductive output with a one year time lag. Oecologia 139:354–358CrossRefPubMedGoogle Scholar
  14. Brown GP, Weatherhead PJ (2000) Thermal ecology of northern water snakes, Nerodia sipedon: population patterns and variation in relation to sexual size dimorphism. Ecol Monogr 70:311–330Google Scholar
  15. Diller LV, Wallace RL (2002) Growth, reproduction, and survival in a population of Crotalus viridis oreganus in North Central Idaho. Herpetol Monogr 16:26–45CrossRefGoogle Scholar
  16. Eifler DA (1996) Experimental manipulation of spacing patterns in the widely foraging lizard Cnemidophorus uniparens. Herpetologica 52:477–486Google Scholar
  17. Environmental Systems Research Institute (2000) ArcView GIS (Version 3.3). Environmental Systems Research Institute, RedlandsGoogle Scholar
  18. Ford NB, Seigel RA (1994) An experimental study of the trade-offs between age and size at maturity: effects of energy availability. Funct Ecol 8:91–96CrossRefGoogle Scholar
  19. Forsman A, Lindell LE (1996) Resource dependent growth and body condition dynamics in juvenile snakes: an experiment. Oecologia 108:669–675CrossRefGoogle Scholar
  20. Garcia PFJ, Merkle MS, Barclay RMR (1993) Energy allocation to reproduction and maintenance in Mountain Bluebirds (Sialia currucoides)—a food supplementation experiment. Can J Zool 71:2352–2357CrossRefGoogle Scholar
  21. Goldberg SR, Rosen PC (2000) Reproduction in the Mojave Rattlesnake, Crotalus scutulatus (Serpentes: Viperidae). Tex J Sci 52:101–109Google Scholar
  22. Guyer C (1988) Food supplementation in a tropical mainland anole, Norops humilis—demographic effects. Ecology 69:350–361CrossRefGoogle Scholar
  23. Guyer C (1988) Food supplementation in a tropical mainland anole, Norops humilis—effects on individuals. Ecology 69:362–369CrossRefGoogle Scholar
  24. Hooge PN, Eichenlaub B (1997) Animal movement extension to Arcview. Alaska Science Center—Biological Science Office, U.S. Geological Survey, AnchorageGoogle Scholar
  25. Kernohan BJ, Gitzen RA, Millspaugh JJ (2001) Analysis of animal space use and movements. In: Millspaugh JJ, Marzluff JM (eds) Radiotracking and animal populations. Academic, San Diego, pp 125–166Google Scholar
  26. Klauber LM (1972) Rattlesnakes: their habits, life histories, and influence on mankind. University of California Press, BerkeleyGoogle Scholar
  27. Kreiter NA, Wise DH (2001) Prey availability limits fecundity and influences the movement pattern of female fishing spiders. Oecologia 127:417–424CrossRefGoogle Scholar
  28. Lourdais O, Bonnet X, Shine R, DeNardo D, Naulleau G, Guillon M (2002) Capital-breeding and reproductive effort in a variable environment: a longitudinal study of a viviparous snake. J Anim Ecol 71:470–479CrossRefGoogle Scholar
  29. Lourdais O, Bonnet X, Shine R, Taylor EN (2003) When does a reproducing female viper (Vipera aspis) ‘decide’ on her litter size? J Zool 259:123–129CrossRefGoogle Scholar
  30. Madsen T, Shine R (1993) Phenotypic plasticity in body sizes and sexual size dimorphism in European grass snakes. Evolution 47:321–325CrossRefGoogle Scholar
  31. Madsen T, Shine R (2001) Do snakes shrink? Oikos 92:187–188CrossRefGoogle Scholar
  32. McKillup SC, McKillup RV (1997) Effect of food supplementation on the growth of an intertidal scavenger. Mar Ecol Prog Ser 148: 109–114CrossRefGoogle Scholar
  33. Monadjem A, Perrin MR (1998) The effect of supplementary food on the home range of the multimammate mouse Mastomys natalensis. S Afr J Wildl Res 28:1–3Google Scholar
  34. Pelletier L, McNeil JN (2003) The effect of food supplementation on reproductive success in bumblebee field colonies. Oikos 103:688–694CrossRefGoogle Scholar
  35. Quinn H, Jones JP (1974) Squeeze box technique for measuring snakes. Herpetol Rev 5:35Google Scholar
  36. Richner H (1992) The effect of extra food on fitness in breeding carrion crows. Ecology 73:330–335CrossRefGoogle Scholar
  37. Rose B (1982) Food intake and reproduction in Anolis acutus. Copeia 1982:322–330CrossRefGoogle Scholar
  38. Rosen PC, Goldberg SR (2002) Female reproduction in the Western Diamond-backed Rattlesnake, Crotalus atrox (Serpentes:Viperidae), from Arizona. Tex J Sci 54:347–356Google Scholar
  39. Scudder-Davis RM, Burghardt GM (1996) Ontogenetic changes in growth efficiency in laboratory-reared water snakes of the genus Nerodia. Snake 27:75–84Google Scholar
  40. Seaman DE, Millspaugh JJ, Kernohan BJ, Brundige GC, Raedeke KJ, Gitzen RA (1999) Effects of sample size on kernel home range estimates. J Wildl Manag 63:739–747CrossRefGoogle Scholar
  41. Secor SM, Nagy KA (1994) Energetic correlates of foraging mode for the snakes Crotalus cerastes and Masticophis flagellum. Ecology 75:1600–1614CrossRefGoogle Scholar
  42. Taylor EN, DeNardo DF (2005) Reproductive ecology of Western Diamond-backed Rattlesnakes (Crotalus atrox) in the Sonoran Desert. Copeia 2005:152–158CrossRefGoogle Scholar
  43. Unangst ET, Wunder BA (2004) Effect of supplemental high-fat forage on body composition in wild meadow voles (Microtus pennsylvanicus). Am Midland Nat 151:146–153CrossRefGoogle Scholar
  44. Wikelski M, Thom C (2000) Marine iguanas shrink to survive El Nino—changes in bone metabolism enable these adult lizards to reversibly alter their length. Nature 403:37–38CrossRefPubMedGoogle Scholar
  45. Worton BJ (1989) Kernel methods for estimating the utilization distribution in home-range studies. Ecology 70:164–168CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Emily N. Taylor
    • 1
  • Michael A. Malawy
    • 1
  • Dawn M. Browning
    • 2
  • Shea V. Lemar
    • 3
  • Dale F. DeNardo
    • 4
  1. 1.School of Life SciencesArizona State UniversityTempeUSA
  2. 2.School of Natural ResourcesUniversity of ArizonaTucsonUSA
  3. 3.Information TechnologyArizona State UniversityTempeUSA
  4. 4.School of Life SciencesArizona State UniversityTempeUSA

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