The planktonic cladocerans Ceriodaphnia richardi, Daphnia gessneri, and birgei inhabit the limnetic littoral zones of Lake Monte Alegre, where former species tends to be abundant. Laboratory experiments were carried out investigate competition for seston in using life table data. In experiment 1, C. richardi D. gessneri fed from zone (1–1.29 mg C L−1); 2, zone. Despite relatively high concentra...

Generalist species commonly have a fundamental role in ecosystems as they can integrate spatially distinct habitats and food-web compartments, as well as control the composition, abundance and behavior of organisms at different trophic levels. Generalist populations typically consist of specialized individuals, but the potential for and hence degree of individual niche variation can be largely ...

The rate of weight specific oxygen consumption in the Red Sea supra littoral crab Grapsus tenuicrustatus was examined under aerial and aquatic conditions. This indicates that the smallest crabs had the highest weight specific oxygen consumption, and the rate of aquatic respiration was lower than that in air. The effect of temperature on the rate of oxygen consumption and heart beat was also inv...

  Littoral cell angioma is a splenic vascular tumor of splenic sinus lining cells that is considered benign in general. This report describes a case of littoral cell angioma with no malignant histological features. The lesion is composed of anastomosing vascular channels resembling splenic sinus; they are lined by endothelial cells which show mitotic activity very rare. Immunohistochemically, ...

1. Comparative research and generalisations in lotic ecology are challenged by the dynamic hydrology of fluvial systems. The aim of this study was to understand more fully how factors such as light, nutrients and flow can predict variation in autochthonous production and algal biomass. 2. We measured seasonal changes in percent bankfull discharge, inorganic nutrient concentrations, turbidity, i...