BI301 Lecture Notes - Lecture 8: Durvillaea, Gastropoda, Allelopathy
Document Summary
Slide set 8- patterns of biodiversity ii- diversity through time: Diversity through space: effects of dispersal and migration. A sequence of species that changes over time. An alteration of the habitat attributable to the biota. A non-seasonal, directional and continuous pattern of colonization and extinction on a site by species populations: types of succession. Involves the colonization of bare ground on newly exposed geological surfaces (e. g. , following retreat of glaciers, on newly-formed volcanic surfaces, on exposed surfaces following severe mud slides or avalanches resulting in destruction of soil) Involves the recolonization of an established ecosystem that has been affected by a disturbance, but where the soil has not been destroyed. Soil type, seed bank, microbiota of soil all influence the speed of re-colonization by various species of plants. Typically, involves abandoned agricultural lands, or lands affected by fire (that were not terribly intense) Driven by biological processes within the community. Involves accumulation of organic matter, increases in shading.
