Ecological Research

, Volume 32, Issue 6, pp 931–941 | Cite as

Variations in aggression and activity levels amongst squirrels inhabiting low and high density areas

Original Article
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Abstract

Variation in an individual animal’s behavioural traits has been observed in a wide range of species and is believed to have important fitness consequences. As part of a larger study, it was observed that squirrels occurred at different densities on a 315 ha island, and this subsequently led to variations in faecal cortisol metabolite levels. This study aimed to examine whether living at different densities would also lead to variations in activity and aggression levels and in their survival probability, breeding and body condition. In order to examine variations in activity and aggression, behavioural tests (open field test, mirror image stimulation, breath rates and struggle rate tests) were conducted on 32 individuals (15♀, 17♂), a total of 69 times. Activity in the wild was investigated through radio tracking. There was a significant correlation between the time a squirrel was active and in their aggressive behaviour during the behavioural tests, with more aggressive individuals also being more active. Squirrels in the low density area spent a greater proportion of time active and engaged in aggressive behaviour in the open field test but also moved further in the wild and had a lower breath rate and higher struggle rates. Squirrels in the high density area were the least aggressive, had a smaller home range and higher breath and lower struggle rates. However, this was found to have no effect on survival probability, breeding or body condition. These variations may be the result of sampling dispersing squirrels.

Keywords

Aggression Activity Home range Fitness Stress Tolerance 

Notes

Acknowledgements

This work was supported by The Irish Research Council, Enterprise Partnership Scheme and Fota Wildlife Park. The authors would like to extend a special thank you to Simon O’Hara of The Fota Resort, Sean McKeown and all the staff of Fota Wildlife Park and gardens and Emily Goldstein of University College Cork. The authors would also like to extend their gratitude to the anonymous reviewers, for their constructive comments, and improvements which they made to the manuscript.

Compliance with ethical standards

Funding

The study was funded by The Irish Research Council, Enterprise Partnership Scheme and Fota Wildlife Park Postdoctoral Fellowship (EPSPD/2012/313).

Conflict of interest

The authors declare that they have no conflicts of interest.

Ethical approval

All procedures performed involving animals were in accordance with the ethical standards of the institution at which the studies were conducted and with national guidelines.

Informed consent

Consent to submit has been received explicitly from all co-authors, as well as from Fota Wildlife Park where the work has been carried out.

Data availability

The datasets produced and analysed during the current study are available from the corresponding author on reasonable request.

Supplementary material

11284_2017_1506_MOESM1_ESM.docx (125 kb)
Supplementary material 1 (DOCX 125 kb)

References

  1. Adriaenssens B, Johnsson JI (2011) Shy trout grow faster: exploring links between personality and fitness-related traits in the wild. Behav Ecol 22:135–143CrossRefGoogle Scholar
  2. Andren H, Delin A (1994) Habitat selection in the Eurasian red squirrel, Sciurus vulgaris, in relation to forest fragmentation. Oikos 70(1):43–48CrossRefGoogle Scholar
  3. Bekoff M (1977) Mammalian dispersal and the ontogeny of individual behavioral phenotypes. Am Nat 715–732Google Scholar
  4. Benjamimi Y, Drai D, Elmer G, Kafkafi N, Golani I (2001) Controlling the false discovery rate in behavior genetics research. Behav Brain Res 125:279–284CrossRefGoogle Scholar
  5. Betts BJ (1976) Behaviour in a population of Columbian ground squirrels, Spermophilus columbianus columbianus. Anim Behav 24(3):652–680CrossRefGoogle Scholar
  6. Blumstein DT, Evans CS, Daniel JC (2000) JWatcher TM 0.9 An Introductory User’s GuideGoogle Scholar
  7. Boon AK, Reale D, Boutin S (2007) The interaction between personality, offspring fitness and food abundance in North American red squirrels. Ecol Lett 10:1094–1104CrossRefPubMedGoogle Scholar
  8. Boon AK, Reale D, Boutin S (2008) Personality, habitat use, and their consequences for survival in North American red squirrels Tamiasciurus hudsonicus. Oikos 117:1321–1328CrossRefGoogle Scholar
  9. Boonstra R, Lane JE, Boutin S, Bradley A, Desantis L, Newman AE, Soma KK (2008) Plasma DHEA levels in wild, territorial red squirrels: seasonal variation and effect of ACTH. Gen comp endocrin 158(1):61–67CrossRefGoogle Scholar
  10. Both C, Dingemanse NJ, Drent PJ, TIinbergen JM (2005) Pairs of extreme avian personalities have highest reproductive success. J Anim Ecol 74:667–674CrossRefGoogle Scholar
  11. Bradshaw WE, Holzapfel CM (2006) Evolutionary response to rapid climate change. Science (Washington) 312(5779):1477–1478CrossRefGoogle Scholar
  12. Burnham KP, Anderson DR (2002) Model selection and multimodel inference: a practical information-theoretic approach, Springer Science and Business MediaGoogle Scholar
  13. Carere C, Van Oers K (2004) Shy and bold great tits (Parus major): body temperature and breath rate in response to handling stress. Physiol Behav 82:905–912CrossRefPubMedGoogle Scholar
  14. Carlstead K, Brown JL (2005) Relationships between patterns of fecal corticoid excretion and behavior, reproduction, and environmental factors in captive black (Diceros bicornis) and white (Ceratotherium simum) rhinoceros. Zoo Biol 24:215–232CrossRefGoogle Scholar
  15. Carlstead K, Brown JL, Strawn W (1993) Behavioral and physiological correlates of stress in laboratory cats. Appl Anim Behav Sci 38:143–158CrossRefGoogle Scholar
  16. Cooch E, White G (1999) MARK: an introductory guideGoogle Scholar
  17. Cote J, Dreiss A, Clobert J (2008) Social personality trait and fitness. Proc R Soc B: Biol Sci 275:2851–2858CrossRefGoogle Scholar
  18. Cote J, Clobert J, Brodin T, Fogarty S, Sih A (2010) Personality-dependent dispersal: characterization, ontogeny and consequences for spatially structured populations. Phil Trans R Soc B: Biol Sci 365:4065–4076CrossRefGoogle Scholar
  19. Haigh A, O’Riordan R, Butler F (2015) The preference for yew (Taxus baccata) by a red (Sciurus vulgaris) only squirrel population. Wildl Res 42(5):426–436CrossRefGoogle Scholar
  20. Haigh A, Butler F, O’Riordan R, Palme R (2017) Managed parks as a refuge for the threatened red squirrel (Sciurus vulgaris) in light of human disturbance. Biol Conserv 211:29–36CrossRefGoogle Scholar
  21. Hoffman CL, Ruiz-Lambides AV, Davila E, Maldonado E, Gerald MS, Maestripieri D (2008) Sex differences in survival costs of reproduction in a promiscuous primate. Behav Ecol Sociobiol 62:1711–1718CrossRefPubMedPubMedCentralGoogle Scholar
  22. Hoset KS, Ferchaud AL, Dufour F, Mersch D, Cote J, Le Galliard JF (2011) Natal dispersal correlates with behavioral traits that are not consistent across early life stages. Behav Ecol 22:176–183CrossRefGoogle Scholar
  23. Ims RA (1990) Determinants of natal dispersal and space use in grey-sided voles, Clethrionomys rufocanus: a combined field and laboratory experiment. Oikos 106–113Google Scholar
  24. Jokimäki J, Selonen V, Lehikoinen A, Kaisanlahti-Jokimäki ML (2017) The role of urban habitats in the abundance of red squirrels (Sciurus vulgaris, L.) in Finland. Urban For Urban GreeGoogle Scholar
  25. Koolhaas J, Korte S, De Boer S, Van Der Vegt B, Van Reenen C, Hopster H, De Jong I, Ruis M, Blokhuis H (1999) Coping styles in animals: current status in behavior and stress-physiology. Neurosci Biobehav Rev 23:925–935CrossRefPubMedGoogle Scholar
  26. Korpela K, Sundell J, Ylonen H (2011) Does personality in small rodents vary depending on population density? Oecol 165:67–77CrossRefGoogle Scholar
  27. Lurz PW, Garson P, Wauters LA (2000) Effects of temporal and spatial variations in food supply on the space and habitat use of red squirrels (Sciurus vulgaris L.). J Zool 251:167–178CrossRefGoogle Scholar
  28. Minderman J, Reid JM, Evans PG, Whittingham MJ (2009) Personality traits in wild starlings: exploration behavior and environmental sensitivity. Behav Ecol. doi: 10.1093/beheco/arp067 Google Scholar
  29. Møller AP (2010) Interspecific variation in fear responses predicts urbanization in birds. Behav Ecol 21:365–371CrossRefGoogle Scholar
  30. Morgan KN, Tromborg CT (2007) Sources of stress in captivity. Appl Anim Behav Sci 102:262–302CrossRefGoogle Scholar
  31. Myers JH, Krebs CJ (1971) Genetic, behavioral, and reproductive attributes of dispersing field voles Microtus pennsylvanicus and Microtus ochrogaster. Ecol Monograph 53–78Google Scholar
  32. Neuhaus P, Pelletier N (2001) Mortality in relation to season, age, sex, and reproduction in Columbian ground squirrels (Spermophilus columbianus). Can J Zool 79:465–470CrossRefGoogle Scholar
  33. Nicolaus M, Tinbergen JM, Bouwman KM, Michler SP, Ubels R, Both C, Kempenaers B, Dingemanse NJ (2012) Experimental evidence for adaptive personalities in a wild passerine bird. Proc R Soc Lond B Biol Sci 279(1749):4885–4892CrossRefGoogle Scholar
  34. Parker TS, Nilon CH (2008) Gray squirrel density, habitat suitability, and behavior in urban parks. Urban Ecosyst 11(3):243–255CrossRefGoogle Scholar
  35. Parker TS, Nilon CH (2012) Urban landscape characteristics correlated with the synurbization of wildlife. Landsc Urban Plan 106(4):316–325CrossRefGoogle Scholar
  36. Penke L, Denissen JJ, Miller GF (2007) The evolutionary genetics of personality. Eur J Pers 21:549–587CrossRefGoogle Scholar
  37. Promislow DE (1992) Costs of sexual selection in natural populations of mammals. Proc R Soc Lond Series B: Biol Sci 247:203–210CrossRefGoogle Scholar
  38. Reale D, Gallant BY, Leblanc M, Festa-Bianchet M (2000) Consistency of temperament in bighorn ewes and correlates with behaviour and life history. Anim Behav 60:589–597CrossRefPubMedGoogle Scholar
  39. Saino N, Calza S, Ninni P, Møller AP (1999) Barn swallows trade survival against offspring condition and immunocompetence. J Anim Ecol 68:999–1009CrossRefGoogle Scholar
  40. Selonen V, Hanski IK (2010) Condition-dependent, phenotype-dependent and genetic-dependent factors in the natal dispersal of a solitary rodent. J Anim Ecol 79(5):1093–1100CrossRefPubMedGoogle Scholar
  41. Selonen V, Hanski IK, Mäkeläinen S (2012) Predictors of long-distance dispersal in the Siberian flying squirrel. Evol Ecol 26(6):1361–1369CrossRefGoogle Scholar
  42. Sih A, Bell A, Johnson JC (2004) Behavioral syndromes: an ecological and evolutionary overview. Trends Ecol Evolut 19:372–378CrossRefGoogle Scholar
  43. Svendsen G, Armitage K (1973) Mirror-Image Stimulation Applied to Field Behavioral Studies. Ecology 54:623–627CrossRefGoogle Scholar
  44. Verboom B, Van Apeldoorn R (1990) Effects of habitat fragmentation on the red squirrel. Sciurus vulgaris L Landsc Ecol 4(2–3):171–176CrossRefGoogle Scholar
  45. Wauters L, Dhondt AA (1989) Body weight, longevity and reproductive success in red squirrels (Sciurus vulgaris). J Anim Ecol 637–651Google Scholar
  46. Wauters L, Dhondt AA (1992) Spacing behaviour of red squirrels, Sciurus vulgaris: variation between habitats and the sexes. Anim Behav 43:297–311CrossRefGoogle Scholar
  47. Wauters L, Dhondt AA (1993) Immigration pattern and success in red squirrels. Behav Ecol Sociobiol 33:159–167CrossRefGoogle Scholar
  48. Wauters LA, Lens L (1995) Effects of food availability and density on red squirrel (Sciurus vulgaris) reproduction. Ecology 2460–2469Google Scholar
  49. Wauters LA, Hutchinson Y, Parkin DT, Dhondt AA (1994) The effects of habitat fragmentation on demography and on the loss of genetic variation in the red squirrel. Proc R Soc London B: (Bio) 255(1343):107–111CrossRefGoogle Scholar
  50. Wauters LA, Preatoni D, Martinoli A, Verbeylen G, Matthysen E (2011) No sex bias in natal dispersal of Eurasian red squirrels. Mammal Bio-Zeitschrift für Säugetierkunde 76(3):369–372CrossRefGoogle Scholar
  51. White GC, Burnham KP (1999) Program MARK: survival estimation from populations of marked animals. Bird Study 46:120–139CrossRefGoogle Scholar
  52. Wirsing AJ, Steury TD, Murray DL (2002) Relationship between body condition and vulnerability to predation in red squirrels and snowshoe hares. J Mammal 83:707–715CrossRefGoogle Scholar

Copyright information

© The Ecological Society of Japan 2017

Authors and Affiliations

  1. 1.School of Biological, Earth and Environmental SciencesUniversity College Cork and Fota Wildlife ParkCorkIreland

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