Activity budgets of a marked common loon (Gavia immer) nesting population

  • David C. Evers
Conference paper
Part of the Developments in Hydrobiology book series (DIHY, volume 96)


A newly devised nightlighting technique was used to capture breeding adult common loons (Gavia immer) at the Seney National Wildlife Refuge in northern Michigan in 1989. The behaviors of 6 pairs of known-sex, color-marked common loons were subsequently quantified during the breeding cycle in 1990. Collected observational data indicate that foraging, resting, locomotion, and preening were frequent throughout the breeding cycle. Time spent foraging was greatest during the pre-nesting period (53 to 57%), but declined significantly during the nesting and post-nesting periods (p<0.05). Time spent foraging during the pre-nesting period was similar to that of fall and winter studies. During the pre-nesting period adult loons spent about 15% of the time in locomotion; this was significantly greater than the other time periods (p<0.05) and is attributed to selecting a nest site. During the nesting cycle, almost half of each bird’s time spent was nest-sitting. Sexual differences were negligible during nest-sitting. Resting and chick-rearing were the predominant behaviors during the post-nesting period and were responsible for the biggest difference in parental duties. Time spent preening declined from 8% during the pre-nesting period to 4 to 5% during the post-nesting period. Time spent by nesting pairs to produce chicks is approximately 10% during pre-nesting, 48 to 49% during nesting, and between 38 to 44% during post-nesting. By quantifying and establishing behavioral standards, subtle abnormalities or changes can be detected to better manage for viable common loon populations.

Key words

common loon time-activity budgets color-marking 


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  1. Barr, J. F., 1986. Population dynamics of the common loon (Gavia immer) associated with mercury-contaminated waters in northwest Ontario. Can. Wildl. Serv., Occas. Paper No. 56.Google Scholar
  2. Bradley, D. w., 1985. The effects of visibility bias on time-activity budget estimate of niche breadthe and overlap. Auk 102: 493–499.Google Scholar
  3. Callopy, M. W. & T. C. Edwards, Jr., 1989. Territory size, activity budget and role of undulating flight in nesting golden eagles. J. Field Ornithol. 69: 43–51.Google Scholar
  4. Evers, D. C., 1993. A replicable capture method for adult and juvenile Common Loons on their nesting lakes. Proceedings from the 1992 Conference by the North American Loon Fund, Bar Harbor, ME. 247 pp.Google Scholar
  5. McIntyre, J. W., 1975. Biology and behavior of the common loon (Gavia immer) with reference to its adaptability in a man-altered environment. Unpubl. Ph.D. Dissert., Univ. Minn., Minneapolis, 230 pp.Google Scholar
  6. McIntyre, J. W., 1978. Wintering behavior of common loons. Auk 95: 396–403.Google Scholar
  7. McIntyre, J. W. & J. F. Barr, 1983. Pre-migratory behavior of common loons on the autumn staging grounds. Wilson Bull. 95: 121–125.Google Scholar
  8. Olson, S. T. & W. H. Marshall, 1952. The common loon in Minnesota. Minn. Mus. Natural. Hist. Univ. Minn., Occas. Pap. No. 5, 77 pp.Google Scholar
  9. Ott, L., 1988. An introduction to statistical methods and data analysis. PWS-Kent Publ. Co., Boston, 835 pp.Google Scholar
  10. Paulus, S. L., 1984. Activity budgets of nonbreeding gadwalls in Louisiana. J. Wildl. Mgmt 48: 371–380.CrossRefGoogle Scholar
  11. Qunilan, E. E. & G. A. Baldassarra, 1984. Activity of non-breeding green-winged teal on playa lakes in Texas. J. Wildl. Mgmt 48: 838–845.CrossRefGoogle Scholar
  12. Strong, P. I. V., 1985. Habitat selection by common loons. Unpubl. Ph.D. Dissert., Univ. Maine, Orono, 53 pp.Google Scholar
  13. Strong, P. I. V., S. A. LaValley & R. C. Burke, 1987. A colored plastic leg band for common loons. J. Field Ornithol. 58: 218–221.Google Scholar
  14. Tacha, T. C., P. A. Vohs & G. C. Iverson, 1985. A comparison of interval and continuous sampling methods for behavioral observations. J. Field Ornithol. 56: 258–264.Google Scholar
  15. Titus, J. R. & L. W. Van Druff, 1981. Response of the common loon (Gavia immer) to recreational pressures in the Boundary Waters Canoe Area, northeastern Minnesota. Wildl. Monogr. No. 79.Google Scholar

Copyright information

© Springer Science+Business Media Dordrecht 1994

Authors and Affiliations

  • David C. Evers
    • 1
  1. 1.Department of Biological SciencesWestern Michigan UniversityKalamazooUSA

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