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FWF315 Week 6 Vocab
| Term | Definition |
|---|---|
| Habitat | Area where an organism, population, or community occurs in the environment - finds suitable conditions to survive and reproduce |
| Lentic | Freshwater habitat; STANDING WATERS (lakes, ponds, swamps, marshes) |
| Lotic | Freshwater habitat; RUNNING WATERS (rivers and streams) |
| Habitat (functional definition) | Water quality and physical and structural components of awuatic environments that influence survival, growth, reproduction, and recruitment of fishes |
| Littoral Zone | Shoreline zone, includes all areas where light reaches the bottom of the lake |
| Limnetic Zone | Offshore zone, all areas where light does not reach the bottom of the lake - open water, pelagic |
| Benthic Zone | All water that touch the lake bottom (includes littoral + [rofundal zones) |
| Photic light zone | Light penetration, primary production present |
| Aphotic light zone | No light penetration, primary production absent, only respiration + decomposition occurs (profundal zone) |
| Epilimnion Temperature Zone | Warm, surface water |
| Thermocline Temperature Zone | Stratton of rapidly changing temp. (metalmnion) |
| Hypolimnion Temperature Zone | Cold bottom water |
| Oxythermal Habitat | During thermal stratification, fish will seek out cool enough water w/ high enough oxygen content |
| Oxythermal Habitat Squeeze | Water temps. near the lake surface become too warm, while oxygen levels in bottom waters become too low, resulting in thin layer of suitable habitat |
| Flood Pulse Concept | Junk et al. 1989; Floodplains provide access to food supply, spawning habitat, + refugia (nursing habitat) for fish species |
| Ecological Integrity | The ability to maintain a balanced community of organisms with the species composition, diversity, and functional organization comparable with natural habitat of that region |
| Sedimentation | Occurs more in reservoirs than natural lakes, eliminates substrates for invertebrates + periphyton, reduces benthic production, decline in lithophilic fishes, decrease plant biomass, altered zooplankton assemblages |
| Nutrients + Trophic Status | Alters dynamics of internal nutrient loading (nutrients liberated following innundation of soils and vegetation), creating more eutrophic systems ; stratification leads to oxythermal habitat squeeze |
| Barren littoral zones | More common old reservoirs or ones that experience significant winter drawdowns; sites of infrequent habitat enhacement |
| Retention Time + Water Levels | Longer retention times = more algal production = altered trophic state (tends toward eutrophic), rapid changes in waterlevel can disrupt spawning behavior or make spawning habitat unsuitable ; disconnection with floodplain habitat + processes |
| Restoration | Return of an ecosystem to its original, undisturbed state (pre-settlement, pre-impoundment, etc...) |
| Mitigation | Alleviate habitat problems negatively influenced by human activities |
| Enhancement | Improve habitat through direct manipulation |
| Salmonidae | Adipose fin, single dorsal fin, no spine on fins, important sports & commercial fishes, wildly introduced in freshwater systems |
Created by:
mmill237
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