Ecological change, group territoriality, and population dynamics in Serengeti lions

Science

Volumn 307, Issue 5708, 2005, Pages 390-393

  Packer, Craig ^a   Hilborn, Ray ^b   Mosser, Anna ^a   Kissui, Bernard ^a   Borner, Markus ^c   Hopcraft, Grant ^c   Wilmshurst, John ^d   Mduma, Simon ^e   Sinclair, Anthony R E ^f  

^a UNIVERSITY OF MINNESOTA   (United States)

^b UNIVERSITY OF WASHINGTON   (United States)

^c Frankfurt Zoological Society Arusha   (Tanzania)

^d PARKS CANADA   (Canada)

^e Tanzanian Wildlife Research Institute   (Tanzania)

^f UNIVERSITY OF BRITISH COLUMBIA   (Canada)

Author keywords

[No Author keywords available]

Indexed keywords

BIODIVERSITY; COMPUTER SIMULATION; VEGETATION;

ECOLOGICAL CHANGES; ENVIRONMENTAL PERTURBATIONS; VEGETATIVE COVER;

ECOLOGY;

ENVIRONMENTAL CHANGE; POPULATION DYNAMICS; TERRITORIALITY;

ANIMAL BEHAVIOR; ARTICLE; ECOSYSTEM; FEMALE; LION; NONHUMAN; POPULATION DYNAMICS; POPULATION MODEL; POPULATION SIZE; PREY SELECTION; PRIORITY JOURNAL; SIMULATION; TERRITORIALITY; VEGETATION;

ALGORITHMS; ANIMALS; ANTELOPES; BEHAVIOR, ANIMAL; ECOSYSTEM; ENVIRONMENT; FEMALE; LIONS; MALE; MODELS, BIOLOGICAL; PLANTS; POPULATION DENSITY; POPULATION DYNAMICS; PREDATORY BEHAVIOR; REPRODUCTION; SEASONS; SOCIAL BEHAVIOR; STOCHASTIC PROCESSES; TANZANIA; TERRITORIALITY;

BIODIVERSITY; ECOLOGY; PLANTS; SIMULATION;

AFRICA; EAST AFRICA; EASTERN HEMISPHERE; SERENGETI NATIONAL PARK; SUB-SAHARAN AFRICA; TANZANIA; WORLD;

EID: 12344300334     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1105122     Document Type: Article

References (23)

1. V. C. Wynne-Edwards, Animal Dispersion in Relation to Social Behaviour (Oliver & Boyd, Edinburgh, 1962).
2. J. R. Krebs, Ecology 52, 2 (1971).
3. C. J. Krebs, Ecology: The Experimental Analysis of Distribution and Abundance (Harper & Row, New York, 1972).
4. A. R. E. Sinclair, in Serengeti: Dynamics of an Ecosystem, A. R. E. Sinclair, M. Norton-Griffiths, Eds. (Univ. of Chicago Press, Chicago, 1979), pp. 82-103.
5. C. Packer, A. E. Pusey, L. Eberly, Science 293, 690 (2001).
6. K. E. McComb, C. Packer, A. E. Pusey, Anim. Behav. 47, 379 (1994).
7. R. Heinsohn, C. Packer, Science 269, 1260 (1995).
8. C. Packer et al., in Reproductive Success, T. H. Clutton-Brock, Ed. (Univ. of Chicago Press, Chicago, 1988), pp. 363-383.
9. C. Packer, D. Gilbert, A. E. Pusey, S. J. O'Brien, Nature 351, 562 (1991).
10. K. G. Van Orsdol, J. P. Hanby, J. D. Bygott, J. Zool. 206, 97 (1985).
11. H. Kruuk, D. W. MacDonald, in Behavioural Ecology, R. M. Sibley, R. H. Smith, Eds. (Blackwell, Oxford, 1985), pp. 521-536.
12. J. P. Hanby, J. D. Bygott, C. Packer, in Serengeti II: Research, Management and Conservation of an Ecosystem, P. Arcese, A. R. E. Sinclair, Eds. (Univ. of Chicago Press, Chicago, 1995), pp. 315-331.
13. Time-series correlations between the change in the number of adults (age ≥ 2 years) in a given month and the change in the number of prides during that same month were highest when "prides" were defined as groups containing four adult females. Plains: N = 369 pride months, r = 0.374, P < 0.0001; woodlands: N = 437 pride months, r = 0.249, P < 0.0001. Autocorrelations within each time series were not significant; best fits were found with a zero time lag between the number of adults and the number of prides.
14. R. Heinsohn, C. Packer, A. E. Pusey, Proc. R. Soc. London Ser. B 263, 475 (1996).
15. An optimal segmentation method (21) determined the number of segments and the date of the change points for each population. This method segments a data series so as to minimize the total sum-of-squares deviations by using the mean and sum of squares for each segment (and assuming a normal distribution and constant variance). The minimum number of equilibria for each habitat was determined by a dynamic programming algorithm that measured the improvement in the sum of squares with each additional segment. A cumulative sum (CUSUM) technique (22) confirmed the number and date of the change points by detecting persistent shifts from a known mean in a time series (table S1).
16. J. P. Hanby, J. D. Bygott, in Serengeti: Dynamics of an Ecosystem, A. R. E. Sinclair, M. Norton-Griffiths, Eds. (Univ. of Chicago Press, Chicago, 1979), pp. 249-262.
17. J. G. C. Hopcraft, A. R. E. Sinclair, C. Packer, J. Anim. Ecol., in press.
18. M. E. Roelke-Parker et al., Nature 379, 441 (1996).
19. B. Kissui, C. Packer, Proc. R. Soc. London Ser. B 271, 1867 (2004).
20. C. Packer et al., Conserv. Biol. 5, 219 (1991).
21. D. M. Hawkins, Stat. Med. 21, 1913 (2002).
22. D. M. Hawkins, D. Olwell, Cumulative Sum Control Charts and Charting for Quality Improvement (Springer, New York, 1998).
23. Supported by NSF Long-Term Research in Environmental Biology grants DEB-9903416 and DEB-0343960, NSF Biocomplexity grant BE-0308486, the Canadian Natural Sciences and Engineering Research Council, and the Frankfurt Zoological Society. We thank H. Brink, J. Fryxell, D. M. Hawkins, G. Sharam, K. Skinner, I. Taylor, P. West, and K. Whitman for advice and assistance and the Tanzanian Wildlife Research Institute and Tanzanian National Parks for permission to conduct research. This paper is the outcome of a working group on the Biocomplexity of the Serengeti hosted by the National Center for Ecological Analysis and Synthesis from 2001 to 2003.