The Janzen-Connell model for tropical tree diversity: population implications and the importance of spatial scale

Article Abstract:

The Janzen-Connell model contains a hypothesis that suggests the ability of a spacing mechanism to maintain high diversity in trees. This spacing mechanism maintains that the open space near the immediate region of adult trees can be colonized by other species without danger of competitive exclusion and that coexistence in a large number of species is possible in this site. A study on Faramea occidentalis subcanopy tree supports this model but cautions on its empirical interpretation. The density and distance-dependent survival results on a small region should not be interpreted as applicable on a greater population scale.

Research, Models, Trees, Trees (Plants), Seeds, Seed dispersal, Ecological research

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River boundaries and species range size in Amazonian primates

Article Abstract:

Rivers are regulatory factors in the dispersal of Amazonian primates. The differences in geographical range size of the river, the extent of subspeciation and the ability of species to cross these ecological barriers affect the type of primate communities in these regions. The body size of the primates and their ability to cross slow flowing rivers with large amount of sediments explains the presence of similar primate communities on both banks. Faster flowing rivers with increased size acts as effective barriers to primate dispersals that result in decline in similarity of primate faunas on opposite sides.

Environmental aspects, Natural history, Amazon River region, Rivers, Primates

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