1.) Of all the energy that could be used to meet global energy demands, what percentage of it are we currently able to capture
The percentage of the energy that we are able to capture is 4%.
2.) What three things have impacted lake trout populations?
The three things have impacted lake trout populations are the following
- Toxic discharges: This has a lot to do with metals, organic chemicals, and deferred sediments typically established in municipal and industrial wastes that are cleared straight into water bodies. Toxic discharges can contrariwise influence the biota which is the living organisms in an environment by slaying them, making them weak, or affecting their aptitude to carry out vital biological purposes (feeding, reproducing, etc.).
- Bacterial contamination: For instance, fecal coliforms that come from the human waste are created in municipal emission expulsions. Drinkable water is treated to abolish fecal coliforms which can cause the individuals to become sick.
- Nutrient buildup: phosphorus and nitrogen are of the most concern because they originate as run-off from fertilizers which are used on agricultural fields. These nutrients, obviously existent in very low concentrations, rouse rapid development of algae and aquatic plants, eventually regulating the quantity of oxygen and light accessible to other organisms in the ecosystem. In addition, aquatic surroundings can be dishonored by habitat change and attendance of invasive species.
3.) What is DDT problematic in the environment? When was DDT banned in the United States?
DDT is basically a determined organic pollutant that becomes very freely adsorbed right into soils and sediments, which can act both as sinks and as long-term sources of exposure funding to terrestrial organisms. DDT is something that is very toxic to a lot of different living organisms, counting marine animals for instance daphnids, crayfish, sea shrimp and a lot of various species of fish. It was banned in the United States in 1972.
4.) Why are macroinvertebrates useful as indicators of stream health?
Aquatic macroinvertebrates are good indicators when it comes to the stream quality for the reason that:
- Every one of them is affected by the chemical, physical, and biological circumstances of the stream.
- They can't escape pollution and display the effects of long- and short term pollution events.
- They could possibly show the cumulative effects of pollution.
- They might show the effects from home loss not noticed by traditional water quality assessments.
- They are a dangerous part of the stream's food network.
- Some are actual bigoted of pollution.
- They are comparatively easy to identify and sample.
5.) As global temperature rise, how are weather patterns predicated to change?
As global temperature rise, how are weather patterns predicated to change concentrations are expected to:
- Upsurge Earth's regular temperature
- Effect the patterns and quantities of rain
- Reduce ice and snow cover, as well as permafrost
- It will also raise sea level
- It will also raise the sharpness of the oceans
6.) How does oil spills impact animals and plants?
It affects the plant growth for the reason that it gives off the toxic fumes. It also does things like block the entire surface of the water, incapacitating carbon dioxide and oxygen to enter it. The plant will not be capable to transpire and photosynthesize. Ultimately the plant will just die.
If oil remains on a beach for a while, other creatures, for instance snails, clams, and terrestrial animals will suffer because the oil will be ingested and sometimes it gets in their feathers and they will not be able to fly.
7.) How do invasive species impact ecosystems?
Aggressive species typically have no natural hunter or they are much more fruitful then the innate life so they wind up taking over that food source which time and again sullying the order of the ecosystem. They can also have the following affect:
- Move native species
- Decrease native wildlife environment
- Decrease forest health and efficiency
- Change ecosystem developments
- Damage recreation parts
8.) Dissolved Oxygen depletion can occur as a result of high natural organic levels
9.) Runoff from agricultural fields may contain fertilizer and pesticides
10.) What 3 factors led to bald eagles being placed on the endangered species list?
- Because they were being hunted.
- They’re very few of them left
- destruction of the eagles' natural habitat
Works Cited
Agricultural Run-Off as a Source of Drinking Water Contamination. (2012, May 4). Retrieved from http://extoxnet.orst.edu/faqs/safedrink/ag.htm
Lewis, G. W. (2012, March 4). Oxygen Depletion in Ponds. Retrieved from http://warnell.forestry.uga.edu/service/library/index.php3?docID=183&docHistory[]=1
Rowen, B. (2009, May 3). Bald Eagle Removed from Endangered Species List. Retrieved from Conservation efforts help population of bald eagle increase from 400 to 10,000 over 40 years: http://www.infoplease.com/science/animals/bald-eagle-removed-endangered-species.html
