Biology 2483A Lecture Notes - Lecture 12: Snow Goose, Golden Apple, Rotifer
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Exploitation a relationship in which one organism benefits by feeding on, and directly harming, another. Most insect herbivores feed on only one or a few plant species: other herbivores (e. g. , grasshoppers) feed on a wide range of species, large browsers, such as deer, often switch from one tree or shrub species to another. For example, when researchers provided guppies with two kinds of prey, they ate disproportionate amounts of whichever prey was most abundant: learning enables them to become increasingly efficient at capturing the most common prey. In some cases, prey switching is consistent with optimal foraging theory. Parasite lives in or on another organism (its host), feedi(cid:374)g o(cid:374) parts of it. Parasitoids are insects that lay an egg on or in another insect host. After hatching, larvae remain in the host, which they eat and often kill. If too much tissue is re(cid:373)oved, or there are(cid:374)"t enough resources for growth, compensation cannot occur.