Conferencias 12 (K, the ‘carrying capacity’) is mirrored by inverse <strong>de</strong>nsity <strong>de</strong>pen<strong>de</strong>nce at the lower threshold. However there have been few papers focused on population dynamics or discussing its stabilizing or <strong>de</strong>stabilizing effects on the predator–prey systems [3, 6, 11, 14]. Here, we focus our attention on <strong>de</strong>terministic continuous time mo<strong>de</strong>l <strong>de</strong>scribing the predation interaction, because simple mathematical mo<strong>de</strong>ls can reveal much about the dynamics and the important implications <strong>of</strong> this phenomenon [7]. We show that the marked differences between logistic growth and growth subject to Allee effects has a pr<strong>of</strong>ound influence on the interaction, but different results are obtained when other forms to this phenomenon are assumed [21]. References [1] Allee, W. C., 1931, Animal aggregations: A study in general sociology, University <strong>of</strong> Chicago.Press, Chicago. Il. [2] Allee, W. C., 1938. The social life <strong>of</strong> animals, W. W. Norton and Co. New York. [3] Bazykin, A. D., Berezovskaya, F. S., Isaev, A. S., and Khlebopros, R. G., 1997. Dynamics <strong>of</strong> forest insect <strong>de</strong>nsity: Bifurcation approach, Journal <strong>of</strong> Theoretical Biology 186, 267. [4] Brauer, F., and Castillo-Chávez, C., 2001 Mathematical mo<strong>de</strong>ls in Population Biology and Epi<strong>de</strong>miology, TAM 40, Springer-Verlag. [5] Clark, C. W., 1990. Mathematical Bioeconomic: The optimal management <strong>of</strong> renewable resources, (second edition). John Wiley and Sons. [6] Conway E. D. and Smoller, J. A., 1986, Global Analysis <strong>of</strong> a System <strong>of</strong> Predator-Prey Equations. SIAM J. Applied Mathematics, Vol. 46, No.4, 630- 642. [7] Courchamp, F., Clutton-Brock, T., and Grenfell, B., 1999. Inverse <strong>de</strong>pen<strong>de</strong>nce and the Allee effect, Trends in Ecology and Evolution Vol 14, No. 10, 405-410. [8] Dennis, B., 1989. Allee effects: population growth, critical <strong>de</strong>nsity, and the chance <strong>of</strong> extinction, Natural Resource Mo<strong>de</strong>ling, Vol 3, No. 4, 481-538. [9] Dennis, B., 2002. Allee effects in stochastic populations, Oikos Vol. 96, 389- 401. [10] González-Olivares, E., Meneses-Alcay, H., and González-Yañez, B., 2005, Metastable dynamics by consi<strong>de</strong>ring strong and weak Allee effect on prey in Rosenzweig-McArthur predator-prey mo<strong>de</strong>l, submitted. [11] Kent, A., Doncaster, C. P.,and T. Sluckin, 2003. Consequences for <strong>de</strong>predators <strong>of</strong> rescue and Allee effects on prey, Ecological Mo<strong>de</strong>lling Vol. 162, 233-245. [12] Liermann, M. and R. Hilborn, 2001, Depensation: evi<strong>de</strong>nce mo<strong>de</strong>ls and implications, Fish and Fisheries, Vol. 2 33-58. [13] McCarthy, M. A., 1997. The Allee effect, finding mates and theoretical mo<strong>de</strong>ls. Ecological Mo<strong>de</strong>lling 103, 99-102. [14] Meneses-Alcay, H and González-Olivares E., (2004). Consequences <strong>of</strong> the Allee effect on Rosenzweig-McArthur predator-prey mo<strong>de</strong>l, In R. Mondini (Ed.) Proceedings <strong>of</strong> the Third Brazilian Symposium on Mathematical and Computational Biology, E-Papers Servicos Editoriais Ltda, Río <strong>de</strong> Janeiro, Volumen 2, 264-277. [15] Stephens, P. A., and Sutherland, W. J., 1999. Consequences <strong>of</strong> the Allee effect for behavior, ecology and conservation, Trends in Ecology and Evolution, Vol.14(10) 401-405.
Conferencias 13 [16] P. A. Stephens, W. J. Sutherland Vertebrate mating systems, Allee effects and conservation, In: Apollonio et (eds.), Vertebrate mating systems, World Scientific Publishing, chapter 9, 2000. [17] Thieme, H. R., 2003. Mathematics in Population Biology, Princeton Series in Theoretical and Computational Biology, Princeton University Press. [18] Turchin, P., 2003 Complex population dynamics: a theoretical/empirical synthesis, Princeton University Press. [19] Wang, G., Liang, X-G., and Wang, F-Z., 1999. Te competitive dynamics <strong>of</strong> populations subject to an Allee effect, Ecological Mo<strong>de</strong>lling 124, 183-192. [20] Wang, M-H and M. Kot, 2001, Speeds <strong>of</strong> invasion in a mo<strong>de</strong>l with strong or weak Allee effects, Mathematical Biociences Vol 171, Nº 1, 83-97. [21] Zhou, S-R., Liu, Y-F. and Wang, G., 2005. The stability <strong>of</strong> predator-prey systems subject to the Allee effect, Theoretical Populations Biology 67, 23- 31.