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Parasites do not affect the density of their host species, but predators affect the density of their prey. Parasites affect how host populations evolve; predators do not affect how prey species evolve. Predators kill their prey more quickly and consume all of it. Parasites tend to be very small relative to their host, and eat only certain tissues.
Predators kill their prey more quickly and consume all of it. Herbivores do not affect the density of their host species, but predators affect the density of their prey. Herbivores tend to eat only certain tissues of their host species. Herbivores affect how their host populations evolve; predators do not affect how prey species evolve.
It is extremely abundant. It is a specialist, meaning that it preys on only one species. It has a large impact on the community, even though it is not particularly abundant. It regulates its prey below the carrying capacity of the habitat.
any defensive response that is produced in response to the presence of a predator any defensive response that is always present a chemical toxin that is particularly effective a weapon that an individual uses only against predators---never against members of its own species
the degree to which the niches of two species overlap interactions that cause a species to occupy a realized niche that is different from its fundamental niche the claim that species with the same niche cannot coexist interactions that allow species to occupy their fundamental niche
