INVESTIGADORES
AIZEN Marcelo Adrian
artículos
Título:
The fit of logspecies-logarea regression lines to nonequilibrium archipelagoes: a simulation approach
Autor/es:
AIZEN M.A.
Revista:
ECOLOGICAL MODELLING
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 1989 vol. 47 p. 265 - 273
ISSN:
0304-3800
Resumen:
n the past, significant positive slopes of logspecies-logarea lines were interpreted exclu- sively in the context of the equilibrium theory of island biogeography. A good fit to the regression model was given as evidence for equilibrium in species´ richness. Here, I investigate whether or not a good fit to the linear version of the power function is frequently obtained in hypothetical nonequilibrium archipelagos with islands possessing species numbers below equilibrium. The proportions of positive significant Iogspecies-logarea regressions fitted to several archipelagos with randomly generated species´ numbers are appreciably greater than zero (between -- 0.17 and 0.93) for a broad range of situations. When decreasing exponential and logistic colonization models were simulated, the probability of obtaining a significant positive slope approached one. The two models produce distinct predictions about the relationship between the slope of the logspecies-logarea line fitted to nonequilibrium archipelagos and the slope under equilibrium conditions.