The term glomerulonephritis (GN) covers a group of conditions in which there is injury in the glomerulus, the filtering unit of the kidney. This can occur either as a primary glomerular disease, or secondary to drugs, infections or tumours (see Secondary Glomerular Disease, pp 464â466 of this issue).
As insects are spiders' main prey, it is likely that they would impose strong selectional forces on the foraging behavior of spiders. Most commonly found in the sheet-web spider families, some webs will have loose, irregular tangles of silk above them.
Insects eat plants, fungi, decaying matter, and smaller insects. Spiders eat insects. Birds eat spiders. Birds are eaten by larger predators, primarily mammals. At the center of the food web are the big cats, which would be at the top of the food chain, if one were to view the prey cycle in a linear fashion.