Mechanisms of species coexistence: a field test of theoretical models using intertidal snails

Article Abstract:

An investigation of the hypothesis is conducted where intraspecific trade-offs between resource availability and mortality risk could lead to spatial segregation of competing species of two marine snails, Littorina sitkana and L. subrotundata. The results indicate that both species agree on the rankings of the habitat riskiness and productivity, experiencing higher predation and higher growth in low- than in high-intertidal habitats.

Varieties, Marine fauna, Marine animals, Snails

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Egg predation and predator-induced hatching plasticity in the African reed frog, Hyperolius spinigularis

Article Abstract:

The density and trait effects of egg-stage predators of the East African reed frog, Hyperolius spinigularis, a species with arboreal clutches and aquatic larvae are examined. Seasonal clutch production and survivorship over two breeding seasons is monitored and thus the effects of different predators on larval input into the aquatic habitat are estimated.

United States, Frogs

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