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Terms in this set (21)
element that is nutrient limiting in freshwater`
element that is nutrient limiting in marine ecosystems
nutrient limiting in the open ocean...because this comes from the land and once you get farther out from the dirt all of it has been used up already
add iron to help with this issue...add iron to open oceans -> phytoplankton grows -> absorb CO2 -> phytoplankton dies and sinks to the bottom, bringing CO2 with it
sliced sediment core
deeper the layer, older the sediment...used for dating...organic analysis...can view environmental events
sediments accumulate -> lakes fill in over time -> can look at sediment to diagnose changes in production
not a natural process, only happens with significant events brought on by humans...no natural ___ over many centuries until specific events occurred (can look back at those and relate them to times in history)
why might building roads lead to eutrophication?
"from a pipe"...human-generated source of nutrients in an ecosystem...domestic sewage, industrial outfalls (paper mills, etc.)...easier to control
dont come from a point...from watershed activities...agriculture (fertilizer, erosion), livestock production (animal waste, erosion), urbanization (human development...erosion, septic tanks, fertilizer)
raw domestic sewage
high in organic matter (called detritus), high in N and P (organic and inorganic), high in disease-causing microbes (bacteria, viruses, etc.)
biological oxygen demand (BOD)
the amount of oxygen consumed by respiration per unit time...depends on concentration of organic matter in the water and how easily the organic matter is decomposed (labile)
___ levels of sewage leads to a ____ BOD...because more bacteria are present to decompose
readily "digested", easily decomposed by bacteria...raw sewage
poorly "digested", not easily decomposed by bacteria...leaves and wood
what happens when raw sewage is dumped into aquatic ecosystems?
Effluent from sewage treatment plant
settle out large stuff
physical removal...screens, settling, floating...not effective at reducing BOD
"biological treatment"...refer to Carbon cycle...add bubbles (O2) for bacteria to use -> will speed up decomposition process by using O2 to break down sewage...keep BOD in mind
An inefficient, mini-sewage treatment plant
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