BIOB50H3 Lecture Notes - Lecture 11: Brachionus, Rotifer, Ecological Society Of America
Document Summary
Recall: over half the species on earth obtain energy by feeding on other organisms, in a variety of types of interactions. All are exploitation a relationship in which one organism benefits by feeding on, and thus directly harming, another. E1/e2 is the ratio of prey 1 eaten relative to prey 2. N1/n2 is the ratio of prey 1 in habitst, relative to prey 2. Guppies focused their foraging efforts on whichever prey species was most common in their habitat: tubificids or fruit flies. 80% of the guppies diet (purple line botton dot) when they were 20% of the prey, tubificids constituted just 10% of the guppies diet. Population cycles can be caused by feeing relations, such as three-way. A specific effect of exploitation can be population cycles. Lotka and volterra evaluated these effects mathematically in the 1920s. Anp is removal of prey by predators. Banp predator is exponential growth depends on predators ability to turn prey into births.
