A researcher has determined that a population of mice has decreased in size as a result of biotic, density-dependent factors. these density-dependent factors would not include fleas, which parasitize mice (and feed on their blood).
Fleas are situation to parasitism through external mites, inner nematode worms, and bacterial, fungal, and protozoan infections. The odor related to rainfall is called petrichor; the moisture causes microorganisms in dry earth to release a molecule that human noses are very touchy to.
The rat flea (Xenopsylla cheopis) is a small parasite that feeds on the blood of rodents. they are regarded as companies of diffusion of diseases and are considered the principal vector of bubonic plague. infection is transmitted after a flea feeds from an inflamed rodent and then bites a human.
Fleas are acknowledged to transmit parasites, such as tapeworm, which often have an effect on pets. adult fleas infected with tapeworm maybe by accident be ingested by cats or dogs in the course of grooming.
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