BIOL 308 Lecture Notes - Lecture 19: Pisaster, Herbivore, Mechanical Equilibrium
5 Mar 2018
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Cascadin effect: top-down control: this is controlled by the predator. Food chain: there could be a different effect. You can generate a response from the bottom. Not regulated (only) by the top like the food chain theory. Both bottom up and top down effects (graph) Apply this idea to lakes (biomanipulation) (control the number of levels to achieve what we want. ) I(cid:374) (cid:449)ater, (cid:449)e do(cid:374)"t (cid:449)a(cid:374)t a gree(cid:374) (cid:449)orld (cid:894)algal (cid:271)loo(cid:373), tur(cid:271)idit(cid:455), et(cid:272) a lot of i(cid:374)dire(cid:272)t effects). What we want if we have 3 levels is to remove the predator, or add a top-carnivore. The key assumption is that the lake functions as a food chain. Add a piscivore that will eat the planktivore that eat zooplankton that eats phydoplankton. Biomanipulation often occurs in places where the problem is from human action already. Re(cid:373)o(cid:448)i(cid:374)g a (cid:862)re(cid:272)reatio(cid:374)al fishi(cid:374)g(cid:863) spe(cid:272)ies i(cid:374) a lkae (cid:449)ith to(cid:454)i(cid:374)s. Photo is quite explicit about the effects of adding a predator at play.
