Biotic Interactions in the Tropics: Their Role in the Maintenance of Species Diversity (Ecological Reviews)
Language: English
Pages: 580
ISBN: 0521609852
Format: PDF / Kindle (mobi) / ePub
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.
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Between mycorrhizal response, growth rates and light intensity are likely to be complex in AM tree species. It is also important to consider (Janos 1980a, 1996) that unresponsive, often slow-growing species may be dependent on mycorrhizal infection to grow at all. Because of the phylogenetic constraints (ectomycorrhizas are restricted to relatively few tree taxa) one could hypothesize that interspecific variation in species MYCORRHIZAS AND ECOSYSTEM PROCESSES IN RAIN FOREST response to ECM.
Of parameter D to parameter C is small in the first species and larger in the second species. The neighbourhood crowding index is defined as follows: γ S ni NCIfocal,k = DBHfocal,k λik i=1 j=1 DBHaj k β Distance j k (4.2) Here NCIfocal,k is the specific value of the neighbourhood crowding index for γ a given focal individual of species k, and DBHfocal,k is the DBH of that focal individual, weighted by an exponent γ that characterizes the sensitivity of individuals of that given DBH of the.
Possibility, it should be noted that these same spatially explicit neighbourhood models perform well at Luquillo and in temperate forests. Despite this low explanatory power on BCI, it is nevertheless interesting that about 60% of species included in the analyses displayed similar responses in growth and survival to the presence of conspecific neighbours. Species that showed strong conspecific effects on growth also showed strong effects on survival while species that supported the equivalent.
(5.1) where In is the number of species with an abundance of n individuals, α is a constant that determines the slope of the rank abundance curve and x is a constant in the range 0–1 (Hubbell 2001, p. 32). The total number of individuals in the sample N (found by the sum of Eq. 5.1 over all n) is αx/(l − x), and therefore x = 1/[1 + (α/N)], so Eq. (5.1) can be written as: In = α n 1 1 + (α/N ) n (5.2) Note that for a given community size N, the distribution is controlled completely by the.
Plant-infecting fungi, only a portion of the included species 153 154 GREGORY S. GILBERT a 0 2 4 6 8 10 12 Number of encounters on host b 0 10 20 30 40 50 Number of encounters on host Figure 6.1 Host specificity of the five most common polypore fungi in (a) the seasonal moist tropical forest of Barro Colorado Island and (b) the Caribbean mangrove forest at Punta Galeta, Republic of Panama. For BCI, different shadings within a bar indicate a different host species, but shades.