Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.
Effects on Freshwater Ecosystems <ul><li>Freshwater ecosystems are particularly vulnerable to change because they tend to ...
Freshwater Ecosystems – Temp. <ul><li>Temperature changes can influence freshwater ecosystems in many different ways. </li...
<ul><li>Warming climate influences not just the organism itself, but also it’s prey and predators. </li></ul><ul><li>Thus ...
Freshwater Ecosystems – Temp. <ul><li>If temperature changes, organisms will migrate towards their preferred temperature –...
Freshwater Ecosystems – Temp. <ul><li>With warming, organisms will migrate upstream towards higher elevations (cooler). </...
Freshwater Ecosystems – Temp. <ul><li>With warming, organisms will migrate deeper (cooler). </li></ul><ul><li>Less habitat...
Freshwater Ecosystems – Temp. <ul><li>Decreased habitat results in unhappy fish – they don’t reproduce as much. </li></ul>...
Freshwater Ecosystems – Temp. <ul><li>For organisms that can’t migrate, increased temperature causes increased metabolism....
Freshwater Ecosystems – Temp. <ul><li>For organisms that can’t migrate, increased temperature causes increased metabolism....
Freshwater Ecosystems – Temp. <ul><li>Increased metabolism comes with other demands – food! </li></ul>
Freshwater Ecosystems – Temp. <ul><li>Changing water temperatures can also change the sex ratio of reptiles, amphibians, f...
Freshwater Ecosystems – Temp. <ul><li>Increased metabolism increases the uptake of toxins that bioaccumulate. </li></ul>
 
Freshwater Ecosystems – Temp. <ul><li>Temperature changes can cause indirect biologic effects as well. </li></ul><ul><li>E...
Freshwater Ecosystems – Temp. <ul><li>Surface warming causes surface water to become less dense – harder to mix downward. ...
Freshwater Ecosystems – Stream Flow <ul><li>Warmer temperatures will increase transpiration causing plants to uptake and r...
Freshwater Ecosystems – Stream Flow <ul><li>Even though precipitation is expected to increase at mid-latitudes, it is thou...
Freshwater Ecosystems – Stream Flow <ul><li>More runoff at high latitudes as more precipitation as rain than snow. </li></...
Freshwater Ecosystems – Stream Flow <ul><li>Increased fluvial erosion at high latitudes. </li></ul>
Freshwater Ecosystems – Stream Flow <ul><li>Mid- and low-latitude streams and lakes likely to have less available water. <...
Freshwater Ecosystems – Sea Level <ul><li>Sea level rise will stress coastal wetlands. </li></ul>
Freshwater Ecosystems – Sea Level
Upcoming SlideShare
Loading in …5
×

09 effects on freshwater systems-1

582 views

Published on

  • Be the first to comment

09 effects on freshwater systems-1

  1. 1. Effects on Freshwater Ecosystems <ul><li>Freshwater ecosystems are particularly vulnerable to change because they tend to be individually small, and relatively isolated. </li></ul><ul><li>Affected in several ways, but primarily through temperature and stream flow. </li></ul>
  2. 2. Freshwater Ecosystems – Temp. <ul><li>Temperature changes can influence freshwater ecosystems in many different ways. </li></ul><ul><li>All organisms have a preferred temperature range. </li></ul>
  3. 3. <ul><li>Warming climate influences not just the organism itself, but also it’s prey and predators. </li></ul><ul><li>Thus entire food web dynamics are affected. </li></ul>
  4. 4. Freshwater Ecosystems – Temp. <ul><li>If temperature changes, organisms will migrate towards their preferred temperature – if they can . </li></ul>
  5. 5. Freshwater Ecosystems – Temp. <ul><li>With warming, organisms will migrate upstream towards higher elevations (cooler). </li></ul><ul><li>Less habitat area upstream! </li></ul>
  6. 6. Freshwater Ecosystems – Temp. <ul><li>With warming, organisms will migrate deeper (cooler). </li></ul><ul><li>Less habitat area at depth! </li></ul>
  7. 7. Freshwater Ecosystems – Temp. <ul><li>Decreased habitat results in unhappy fish – they don’t reproduce as much. </li></ul><ul><li>Trout habitat could shrink 30-40%, and for some species of salmon by as much as 50%. </li></ul>
  8. 8. Freshwater Ecosystems – Temp. <ul><li>For organisms that can’t migrate, increased temperature causes increased metabolism. </li></ul>
  9. 9. Freshwater Ecosystems – Temp. <ul><li>For organisms that can’t migrate, increased temperature causes increased metabolism. </li></ul>
  10. 10. Freshwater Ecosystems – Temp. <ul><li>Increased metabolism comes with other demands – food! </li></ul>
  11. 11. Freshwater Ecosystems – Temp. <ul><li>Changing water temperatures can also change the sex ratio of reptiles, amphibians, fish, and insects. </li></ul>
  12. 12. Freshwater Ecosystems – Temp. <ul><li>Increased metabolism increases the uptake of toxins that bioaccumulate. </li></ul>
  13. 14. Freshwater Ecosystems – Temp. <ul><li>Temperature changes can cause indirect biologic effects as well. </li></ul><ul><li>Eutrophication. </li></ul>
  14. 15. Freshwater Ecosystems – Temp. <ul><li>Surface warming causes surface water to become less dense – harder to mix downward. </li></ul><ul><li>Warmer water also holds less dissolved oxygen to begin with. </li></ul>
  15. 16. Freshwater Ecosystems – Stream Flow <ul><li>Warmer temperatures will increase transpiration causing plants to uptake and release more water. </li></ul><ul><li>Less is available for runoff or groundwater input to lakes and streams. </li></ul>
  16. 17. Freshwater Ecosystems – Stream Flow <ul><li>Even though precipitation is expected to increase at mid-latitudes, it is thought that increased transpiration due to warming may offset the increase. </li></ul>
  17. 18. Freshwater Ecosystems – Stream Flow <ul><li>More runoff at high latitudes as more precipitation as rain than snow. </li></ul><ul><li>Remobilization of sediments. </li></ul>
  18. 19. Freshwater Ecosystems – Stream Flow <ul><li>Increased fluvial erosion at high latitudes. </li></ul>
  19. 20. Freshwater Ecosystems – Stream Flow <ul><li>Mid- and low-latitude streams and lakes likely to have less available water. </li></ul><ul><li>- more winter precipitation as rain (more will runoff than be stored). </li></ul><ul><li>- less precipitation and/or greater evaporation during summer result in lower water levels. </li></ul><ul><li>- altering of lake chemistry by ion concentration. </li></ul>
  20. 21. Freshwater Ecosystems – Sea Level <ul><li>Sea level rise will stress coastal wetlands. </li></ul>
  21. 22. Freshwater Ecosystems – Sea Level

×