Explaining productivity-diversity relationships in plants

Article Abstract:

Five hypotheses have been developed to account for how competition explains why diversity declines from intermediate to high productivity, though none have been directly tested. Indirect evidence suggests where soil resources limit growth, diversity is high, and where environments promote size asymmetric competition, diversity may be low.

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Plant abundance: the measurement and relationship with seed size

Article Abstract:

Research finding positive relationships between plant distribution and abundance have depended on density or population size to measure abundance. When cover or biomass determines abundance, reported patterns should be significantly different, and this would also be true when examining the relationship between abundance and seed size.

Nursery and Floriculture Production, Seeds, AGRICULTURAL PRODUCTION--CROPS

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Predatory fish impact on competition between stream insect grazers: a consideration of behaviorally- and density-mediated effects on an apparrent coexistence pattern

Article Abstract:

Competition between stream insects is apparently not mediated by predatory fishes. A theoretical model suggests two competing prey densities under predation pressure could be simultaneously greater than those under conditions when predators are absent when behaviorally-mediated effects of predators are strongly operative.

Commercial Fishing, Fishing, Behavior, Fishes, Predation (Biology), Predatory animals, Insects, Aquatic, Aquatic insects

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