BIOL 353 Lecture Notes - Lecture 5: Hubbard Brook Experimental Forest, Climax Species, Seral Community

• School: Concordia University
• Department: Biology
• Course: BIOL 353
• Professor: Jean- Philippe Lessard

Document Summary

Directional change in community structure through time. Grass shrub forest (made of stages called seral stages) really, it is a continuous process. Each seral stage may be years to decades (because of many factors such as human disturbances or just time allowed for growth that differs, like seasons) Wayne and sousa: when a species decline the other increases (graph) Earl(cid:455) su(cid:272)(cid:272)essio(cid:374)al spe(cid:272)ies: high growth, s(cid:373)all size (cid:894)r-strategists) Late su(cid:272)(cid:272)essio(cid:374)al spe(cid:272)ies: low dispersal, slower growth (cid:894)k-strategists) Clear cut trees at top to see how bottom of the forest will be affected. They saw that the climax species declined and others increased. Example of deterministic vs stochastic models (stochastic in this case) Pri(cid:373)ar(cid:455) su(cid:272)(cid:272)esio(cid:374): site u(cid:374)(cid:374)o(cid:272)ipied (cid:271)(cid:455) a(cid:374)(cid:455)thi(cid:374)g (cid:894)ro(cid:272)k or sa(cid:374)d du(cid:374)es for e(cid:454)a(cid:373)ple(cid:895) see(cid:374) i(cid:374) sousa"s experiment: sand dunes: plants stabilize dunes, mostly grasses, then shrubs invade, then trees, glacier recession: can show a gradient of succession to study.