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Syst. 4:1-23. Howe, H. F. 1981. Removal of wild nutmeg (Virola suranimensis) crops by birds. Ecology 62:1093-1106. Hurlbert, S. , and M. S. Mulla. 1981. Impacts of mosquitofish (Gambusia affinis) predation on plankton communities. Hydrobiologia 83:125-151 . About this PDF file: This new digital representation of the original work has been recomposed from XML files created from the original paper book, not from the original typesetting files. Page breaks are true to the original; line lengths, word breaks, heading styles, and other typesetting-specific formatting, however, cannot be retained, and some typographic errors may have been accidentally inserted.

Habitat quality is commonly judged by population density, on the assumption that high density indicates high quality of habitat. This assumption is often valid, but data on survival and reproductive success are generally needed to understand differences in population densities. High densities can occur in suboptimal habitats composed mostly of subdominant individuals that have been forced out of other habitats (Van Home, 1983). Population Stability A population with a zero growth rate is in equilibrium.

Am. Sci. 52:137-156 . Gilbert, L. E. 1975. Ecological consequences of a coevolved mutualism between butterflies and plants. Pp. 210-240 in L. E. Gilbert and P. H. Raven, eds. Coevolution of Animals and Plants. University of Texas Press, Austin. Goodman, D. 1975. The theory of diversity-stability relationships in ecology. Q. Rev. Biol. 50:237-266 . Gulland, J. , and S. Garcia. 1984. Observed patterns in multi-species fisheries. Pp. 155190 in R. M. May, ed. Exploitation of Marine Communities. Dahlem Konferenzen.

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