Biotic Interactions in the Tropics: Their Role in the Maintenance of Species Diversity (Ecological Reviews)
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To understand how tropical ecosystems function we need to appreciate not only what plants, animals and microbes they contain, but how they interact with each other. This volume synthesizes the current state of knowledge of tropical biotic interaction, with chapters providing reviews or case studies drawn from research conducted in both Old and New World tropics, including interactions among taxa at all levels. An underlying theme of the volume is revealing the importance of the maintenance of high diversity in tropical regions.
texture, over metres because of differences in canopy structure, and over tens of metres because of slope gradients. Soil water contents may differ between gap and understorey sites, but the direction and magnitude of the response is still not clear: soil water contents have been variously reported to be higher RESOURCE CAPTURE AND USE BY TROPICAL FOREST SEEDLINGS in gap than in understorey sites (Parker 1985; Becker et al. 1988; Jetten 1994; Veenendaal et al. 1996b; Ostertag 1998), similar
takes on a characteristic shape (the family of curves that Hubbell calls the zero-sum multinomial or ZSM). In the high-diversity limit (a large metacommunity with no dispersal limitation) this shape tends to the log-series, which appears as a straight line on a chart of log abundance vs. rank abundance (Hubbell 2001: for example see Fig. 5.3 bottom right). Niche structure can look like drift: a simple proof How do the predictions of zero-sum ecological drift change when niche structure is
agronomic and wild systems, nearly all fungal diseases except heteroecious rusts show density-dependent development (see reviews in Burdon & Chilvers 1982; Gilbert 2002). As such, density-dependent disease development, at least for fungal and oomycete-caused diseases, is probably the rule in both tropical and temperate systems, but there are exceptions. Davidson (2000) found that for two pathogens of Anacardium seedlings, Phytophthora heveae showed density-dependent effects on the seedling
luminescent mushroom. The agaric Mycena citricolor causes American leaf spot disease of introduced coffee (Coffea spp., Rubiaceae), a devastating disease through much of tropical America. It also has an exceptionally large host range. Sequiera (1958) found it causing leaf spots on 150 host plants from 45 families in Costa Rica, including many forest tree species. Although it can cause disease on many hosts, M. citricolor may reproduce readily on only a small number of hosts (Sequiera 1958). Lodge
than in the temperate zone. Ceiba 14:17–28. Wellman, F. L. & E. Echandi. 1981. The coffee rust situation in Latin America in 1980. Phytopathology 71:968–971. Weste, G. & G. C. Marks. 1987. The biology of Phytophthora cinnamomi in Australasian forests. Annual Review of Phytopathology 25:207–229. Weston, W. H. 1933. The fungi of Barro Colorado. Science Monthly 36. Wilson, D. 1995. Endophyte – the evolution of a term, and clariﬁcation of its use and deﬁnition. Oikos 73. Worrall, J. J. & T. C.