Low intertidal communities of Oregon and Panama have many predator
and herbivore species. This diversity of consumers is important to the
organization of both communities because of qualitative differences
among the consumer species in their ability to circumvent specific prey
defenses. In Oregon, the red alga Iridaea cordata is protected...
Aggregation and species association of 9 species of phytophagous and
predaceous mites were studied for 6 yr in an orchard with 100, 2 m tall 'Red
Delicious' apple trees. To quantify aggregation, a method was developed that is
powerful, and easily interpreted. It relates the proportion of habitat occupied to...
Calow (1983) realized that differences between parasites and their free-living
relatives can be explained by the differences in nutrient richness. I
propose a model that is based on Calow's idea which identifies the relative
position of different trophic strategies (e.g. predation, grazing, parasitism and
others) based on (1) the differences...