ENV234H1 Lecture Notes - Lecture 14: Oak Savanna, Germination, Malaise Trap
Document Summary
Pool of potential invaders: dispersal ability, remoteness of disturbed site. Inhibition: tolerance, predators, trophic cascades, pool of potential invaders cont. Recolonization on mount st. helens, wa: volcanic eruption completely destroyed one side of the mountain (covered with ashes, early plant colonizers: light, wind-borne seeds (good dispersal but low survival) E. g. , fireweed and pearly everlasting lupine: poor dispersal (arrives by chance), but sets a conducive environment. N2 fixer (enrich soils) and provides sheltrer. The further the distance from refugium, the less cover of plants (measure of biomass decreases: patchiness of recolonization. Slow increase of species during the time of about a decade; there is then a large increase, and then it plateaus. Variability of diversity and plant biomass in different sites: length of time needed for recovery is long (slow and patchy recovery, species interactions during succession. Retreating glacier; about 100 km since 1750. Pioneers (light seeds: e. g. , mosses and epilobium.
