PLNT 460 Lecture Notes - Lecture 5: Superorganism, Systematic Sampling, Beta Diversity
3 Sep 2016
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Document Summary
A land that is saturated with water long enough to promote wetland or aquatic pro- cesses as indicated by poorly drained soils and hydrophytic vegetation. Pool of biodiversity including 1/3rd of threatened species in canada. Influence the water cycle by retaining excess nutrients and pollutants. Mesic habitats have a good balance of moisture. Laws in place requiring authorization for activities that can affect wetlands. Based on plant species presence (>50% of obligate or facultative wetland species) Bimodal species responses curve (restricted by competition at the optimal range) Vegetation units repeat themselves in space (community types) Generalists can adapt to a wide range of conditions. Multiple factors impacting species composition can exist in the same area. Coenocline- displays functional responses of many species along a gradient. Species distribution can be described along several gradients. Hydrology- water depth, duration and frequency of flooding. Soil-water chemistry- nutrient (p, n) concentration, ph, salinity.
