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Ecology
ecosystem ecology
| Question | Answer |
|---|---|
| Primary production definition | Convert CO2 to carbs using solar energy; energy stored in chemical bonds in carb molecules |
| factors affecting primary production | light (to a point) temperature (but then more respiration) water, nutrients |
| Effect of light | At compensation point, photosynthesis balances respiration; then at saturation point photosynthesis no longer increases with increasing light intensity |
| effect of nutrients | Nitrogen + phosphorous needed for/important for processes + |
| Trophic effiencey and food chain length | because of tropical efficiency energy will “run out” ay a particular level; Terrestrial eco = ~10% eff max of 4 trophic levels; aquatic = slightly higher, max of 5 levels |
| Movement of nutrients within ecosystems | carbon/nitrogen/ phosphorus; reservoirs hold nutrients (for varying lengths of time) processes move nutrients from one r to another Key processes = hydrologic cycle; weathering + leeching, decomposition |
| Hydrologic cycle | water can be in many different reservoirs (ex ground water, ocean) evaporate. Condense, water storage in atmosphere, storage in ice/snow, precipitation |
| Trophic efficiency definition | |
| Weathering and leeching definition | precipitation will travel thru soil, picking up nutrients and carry them with them wherever they go (leeching) water will also erode rock, breaking it down into small sediments and releasing minerals (weathering) |
| Decomposition definition | |
| Effect of solar energy on nutrient cycling (thru hydrologic cycle) | greater solar output, increases evaporation/metabolism/decomposition rates/precipitation, (greater nutrient cycling in warmer areas of globe) |
| 3 different cycles of nutrients | Carbon/nitrogen/phosphorous |
| NPP definition | |
| Carbon cycle | photosynthesis removes carbon, respiration of plants + detrivores breaking down dead organisms returns it, animals eat plants/animals passing it thru web, fires/fossil fuels release it into atmosphere , over time dead organic matter gets buried/stored |
| Nitrogen cycle | metabolic activity of bacteria, plants converting ammonia to nitrates |
| Phosphorous cycle | |
| Nutrients /primary productivity in terrestrial vs aquatic | T: canopy = PP zone; forest floor = zone of decomposition A: photic zone/surface waters = PP zone, benthic zone/bottom sediments = zone of decomposition |
| Limnetic zone definition | shallower lake has less worry about nutrient cycling then deeper lake ??? |
| Photic vs aphotic zone | |
| Movement of nutrients in lakes caused by… | temperature -> ice in winter gives isolation; in summer there is a thermocline; in fall/spring = same temperature water = optimal nutrient cycling and mixing because its all the same density |
| Movement of nutrients in other aquatic systems… |
Created by:
every_august
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