Bio E179 Lecture 2 Notes .pdf

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University of California - Irvine
Biological Sciences
Rahul Warrior

Lecture 2Review from Lecture 13 major fluvial zoneszone of erosion2 zone of storage and transport of sediment3 zone of sediment depositionHigh productivity of wetlands equal to or greater than rainforests Ultimate base levelsea level toward which all moving waters erode Loticflowing or moving water streams rivers Lenticstill water lake like Lacustrine lake Riparian values of riparianwetland habitats Natural vs artificial channels Losses of wetlandswhy Mitigation Point bars pools and riffles Channel erosion occurs on the outside of meanders deposition point bars occurs on the inside of meanders Nonnative exotic speciesfishes other examples their replacement of native species Primary secondary truly marine fishes Anadromous and catadromous life histories of fish River divisions Oxbow lakes and meander scars Gradientprofile Oligotrophicnutrient poor sterile little nitrate or orthophosphate similar to a fertilizer for algaetypically cold clear water headwater conditions Eutrophicabundant supply of nutrients often a polluted condition enriched with nitrate and orthophosphate Generally the lower down stream the more eutrophic the conditions A continuation from material begun in Week 1 and a thumbnail sketch of Week 2OutlineLife cycle of aquatic insectsan egg is laid in the water it hatches and an immature insect lives underwater with gills eventually it matures and either crawls out of the water onto rocks or vegetation or it floats to the surface of the water when its wings dry it lives a terrestrial airbreathing life till it mates eggs are laid in the water and it diesheterotrophic autotrophicallochthonousexternal sources of organic material transported in a dead or decomposed state into a biological community dead leaves from the headwaters floating downstream for exampleautochthonousphotosynthetic production of organic material within a biological communitybenthicbottom of a water bodyRiver continuum hypothesis4 categories of organic resources in stream ecosystems primary producers detritus dissolved organic matter animal consumers4 impacts of stream regulation lowered flows changes in light penetration changes in temperature changes in quantity and form of organic resourcesStream orderCharacteristics of headwater midreach and lowermost river sectionsPhotosynthesisRespiration ratios in the different stream sectionstailwater reservoir impoundmentrationales reasons for building dams impacts on migratory fish salmonbenthosflora and fauna living on the bottom of a lake stream or seadetritusdecomposing organic matterperiphytonmicrofloral growth on substrates such as rocks or wood debrismacrophyteslarge forms of aquatic plants usually applied to beds of vascular plant weeds attached vascular plants large algae etc4 factors governing riverine ecosystems annual hydrographic pattern geomorphic setting vegetational setting stream order
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