1. AQUATIC ECOSYSTEMS LANDSCAPE ECOLOGY RESTORATION ECOLOGY ECOSYSTEM MANAGEMENT
Chapters 8 and 10

2. What are the basic needs of aquatic biota?
CO2 O2
Sunlight
Nutrients- food & minerals

3. What factors influence the availability of those basic needs?
Substances dissolved in water- Nitrates, phosphates, potassium, O2
Suspended matter- (silt, algae) can affect light penetration
Depth
Temperature
Rate of flow
Bottom characteristics (muddy, sandy, or rocky)
Internal convection currents
Connection to or isolation from other aquatic ecosystems.

4. Types of Aquatic Ecosystems
Freshwater Ecosystems
Standing Water- lakes & ponds
Moving Water- rivers & streams
Transitional Communities
Estuaries
Wetlands- bogs/fens, swamps, marshes
Marine Ecosystems
Shorelines
Barrier Islands
Coral Reefs
Open Ocean

5. Freshwater Ecosystems
Usually 0.005% salt
Some exceptions:
Great Salt Lakes-
5-27% salt
Dead Sea- 30% salt
Moving water- high elevations; cold; high O2; trout; streamlined plants
Standing water- lower elevations; warmer; less O2; bass, amphibians; cattails, rushes

6. How is a lake stratified and what lives in each level?
Epilimnion- upper layer of warm water; high light & O2; ex: water striders, phyto- & zooplankton, fish
Thermocline (mesolimnion); middle layer; medium light & O2; ex: phyto- & zooplankton, fish
Hypolimnion- lower layer of cold water; lower light & O2; ex: fish
Benthos- bottom level; no light & little O2; ex: anaerobic bacteria, leeches; insect larvae
Littoral- near the shoreline; cattails, rushes, amphibians, etc.

7. Transitional Communities
ESTUARIES
Where freshwater dumps into ocean
Brackish (less salty than seawater)
Has rich sediments that often form deltas
Productive & biodiverse
Organisms adapted to varying levels of salinity as tide ebbs & flows
“Nursery” for larval forms of many aquatic species of commercial fish & shellfish

8. Transitional Communities
WETLANDS
Land saturated at least part of the year
Swamps- have trees like bald cypress; high productivity
Marshes- no trees; tall grasses; high productivity
Bogs/Fens- may or may not have trees; waterlogged soil with lots of peat; low productivity
Fens- fed by groundwater & surface runoff
Bogs- fed by precipitation
Swamp
Marsh
Bog
Fen

9. Importance of Wetlands
Highly productive- get lots of sunlight, ↑ plants =
↑ animals
Nesting, breeding ground for migratory birds
Slows flooding by absorbing runoff
Silt settles, making water clearer & nutrient rich
Trap & filter water
Natural chemical rxns neutralize and detoxify pollutants
Gives H2O time to percolate thru soil & replenish underground aquifers.
Threats- artificial eutrophication (see slide 13), draining, sedimentation via construction
“Nature’s Septic Tank”

10. Marine Ecosystems SHORELINES
Rocky coasts- great density & diversity attached to solid rock surface
Sandy beaches- burrowing animals
Threats- due to hotels, restaurants, homes on beach, more plant life destroyed, destabilizing soil, susceptible to wind & water erosion
Insurance high; danger of hurricanes, erosion
Build sea walls to protect people but changes & endangers shoreline habitat

11. Marine Ecosystems BARRIER ISLANDS Low, narrow offshore islands
Protect inland shores from storms
Beauty attracts developers = developers destroy land
New coastal zoning laws protect future development

12. MARINE ECOSYSTEMS CORAL REEFS Clear, warm shallow seas
Made up of accumulated calcareous (made of calcium) skeletons of coral animals
Formation depends on light penetration.
Have a symbiotic relationship with algae
Very diverse, abundant (rainforests of sea)
Threats- destructive fishing (cyanide & dynamite to stun fish), pet trade; about 3/4ths have been destroyed

13. What factors can alter aquatic ecosystems?
Natural Succession- normal cycle of pond becoming forest
Artificial Succession- humans add N & P to water via fertilizer & sewage causing succession to happen faster = EUTROPHICATION

14. What factors can alter aquatic ecosystems?
Humans!
Find food
Recreation
Waste disposal
Cooling of power plants
Transportation
Dams, canals

15. Biomes
Which biome has the largest total area? The smallest total area?
Which biome has the highest % of undisturbed habitat?
Which biome has the lowest % of undisturbed habitat?
Which biome has the highest % human dominated habitat?
Which biome has the lowest % human dominated habitat?

16. LANDSCAPE ECOLOGY

17. LANDSCAPE ECOLOGY
Landscape- geographic unit with a history that shapes the features of the land and organisms in it.
Landscape ecology- the study of how landscape structure affects the abundance and distribution of organisms.
Does not just focus on “untouched nature”

18. LANDSCAPE ECOLOGY
Uses geographical information systems (GIS) to map patch size, type and configuration to create 3-D maps
These maps assist land planners in analyzing land use patterns

19. LANDSCAPE ECOLOGY
Focus on how neighboring communities of a landscape interact

20. RESTORATION ECOLOGY
Chapter 10

21. RESTORATION ECOLOGY
Repair or reconstruct ecosystems damaged by humans or natural forces
Growing field of science
People are now being held responsible for their actions- restoring wetlands & habitat for endangered species
Before
After

22. The 5 “R’s” of Restoration Ecology
Restoration- manipulation of nature to re-create species composition & ecosystem processes as close as possible to the state they were in before humans interfered.
Before
After

23. The 5 “R’s” of Restoration Ecology
Rehabilitation- to bring an area back to a useful state for human purposes rather than a truly natural state.
- reverse deterioration if can’t be restored fully
These people in Africa are trying to use rocks to create a sort of wind break to prevent wind erosion of their soil. The soil will never be like it was but it will hopefully be usable.

24. The 5 “R’s” of Restoration Ecology
Remediation- process of cleaning chemical contamination from a polluted area by physical or biological methods to protect human & ecosystem health
- Incinerate soil contaminated with oil
- use special bacteria to clean up oil spills in water (bioremediation)
This is like an artificial wetland- wastewater comes in, settles, roots cleanse the water

25. The 5 “R’s” of Restoration Ecology
Reclamation- techniques used to restore the shape, original contour and vegetation of a disturbed site
- Surface Mining Control & Reclamation Act (SMCRA) requires mining operations to restore the open pit mines they create to natural state.
Before
After

26. The 5 “R’s” of Restoration Ecology
Re-creation- attempts to construct a new biological community on a site so severely disturbed that there is virtually nothing left to restore.
- often must build a wetland elsewhere to make up for the one destroyed by developer
- Read story of Army Corp of Engineers & Florida Everglades restoration

27. Preservationists vs. Restorationists
Preservationist- don’t start destructive projects in the first place. Preserve nature- “you can’t always fix what you broke”
Restorationists- you are never going to be able to save every bit of land. Who says changes we make in restoring ecosystems is unnatural?
Are we members of the community or separate from it?
Should we use our creative energies to try to improve nature, or should we leave well enough alone?

28. Tools of Restoration
Prairies- collect native prairie grasses from graveyards and plant in abandoned farm fields to reestablish native grasslands
Remove alien species- like nature center; hunting goats on Galapagos
Walk away from ecosystem & let recover naturally- N. & S. Korea after the Korean War

29. Restoration Ethics
If habitat was filled with diseased, ugly organisms, should you return it to that state? Should you reintroduce mosquitoes, black flies, leeches, ticks, poisonous snakes?
Should you improve on nature?
Where do you find plants for restoration? Do you take from small population nearby or find larger population farther away?
Is there more than one natural state? What is the history of the area?
Since humans are part of nature, whatever changes we make to landscape also are natural. Is that true?
Can we use nature to solve human problems? Read story on page 121 about Arcata, California’s artificial wetland project.
Canal in China Before
Canal in China After
Notice plants used as filtering system

30. Ecosystem Management
How can we have progress and still maintain the environment?
Aldo Leopold was one of the pioneers on his Sand County farm
US Forest Services, Bureau of Land Management, National Park Service all adopted versions of ecosystem management
Previously, these agencies used their lands for commercial or recreational uses & did not focus on wildlife habitats, endangered species, etc.