BIOB50H3 Lecture Notes - Lecture 10: Keystone Species, Abiotic Component, Biogeography
Document Summary
By definition, the only possible missing interaction is non-trophic interactions, like competition or symbiotic mutualism: agents of change. Document created: 2018-09-04: community succession, following appearance of new habitat, or disturbance that removes species, a community will undergo a predictable sequence of changes. Frequent disturbances means more primary patches, rare disturbances means more patches in the climax community, in each case decreasing richness. Secondary succession: colonization following disturbances that eliminated all species from an area, ex. Glacial retreat, volcanic eruption: recolonization following a disturbance that only partially removed species from an area (some persist as adults or seeds) Interactions influence succession: typically, as succession level increases, so does species biodiversity, measured here in the. Glacier bay case study in alaska as four distinct steps: Sitka spruce forest (the spruce stage) is in place, which fosters a diverse array of lichens, low shrubs, and herbs.
