Lake Tahoe Ecosystem

Brooks and Dodson, the authors of the article titled “Predation, Body Size, and Composition of Plankton”, conducted research on the effect the small fish called Alosa Pseudoharengus has on an ecosystem, more specifically, different lakes in New England. Along with the data they collected on the aforementioned matter, they studied the sizes and the composition of the miniscule zooplankton inhabiting the lakes, and compared it with that of the Alosa. Their research uncovered important facts regarding water ecosystems and how they are so easily thrown off balance.

More than 24 billion gallons of untreated sewage waste and storm water are pumped into the lakes annually. Pollution is increasing as well, due to the cottage development, where people enjoy spending their summers relaxing. For many years, the lake habitats have been affected by pollution and habitat destruction. The market for fish is tremendous; so much so, that we have depleted our fishing resources, and have had to market on invasive species.

Crayfish, Orconectes propinquus, are ectotherms that do not generate internal heat and rely on external temperatures to determine their body temperature. The crayfish we tested were found in Medway Creek and therefore undergo considerable temperature changes throughout the year. Since these crayfish are able to adapt to various temperatures allowing them to live in numerous places, their survival rate would be higher than many other organisms.

Approximately eleven years ago, an area of Alaska's southern coast known as Prince William Sound was a disaster area. A nauseating scent of rotting carcasses and oil filtered through the air. Sea birds screamed in anguish as they fought to survive with oil drenched feathers. Under the surface billions of organisms ceased to live due to the toxicity of the inescapable wrath of the blackened water. Prince William Sound had once been a place of beauty and grace, now it was home to an environmental deathbed. The media broadcast pictures of this nearly unbearable scene throughout the world. Most people, including myself, wondered if the ecological war zone would ever recover

“Change in the timing and amount of stream flows and spring and seep discharges will affect a wide range of wildlife species, livestock, and wild horses and burros. Water availability from these sources could dry up earlier in the summer as a result of the early melt of the snowpack causing increased competition for water and forage across the landscape. Pipelines and troughs installed by BLM and livestock permits that provide water for livestock, wild horses, and wildlife species over tens of millions of acres may have a reduced capacity to meet these needs” (Pellant). “The Great Basin Desert is home to more than 77,000 mountainous acres of land, 5 distinctive habitats, 71 different kinds of mammals, 18 types of reptiles, and 800 different plant species” (Grange). With all this changing it will be difficult for the desert’s water to meet animal and nature’s needs for life. One animal this has an effect on is the Bull Trout an endangered fish and facing extinction in this desert

The California Gold Rush had a positive impact on California’s environment in many different ways, but along with the positives came the negative impacts. In 1848, people flocked to California in hope to make their gold filled dreams come true and strike it big, but with the more people moving to California, the more the population rose, leaving destructive effects on the state’s environment then and for the years to come. California’s physical environment was shaped not only by the influx of people, but also the manmade structures they added and how they manipulated the state’s land to embrace the large population that wasn’t there before the Gold Rush hit.

As a historically semi-arid environment, California has also suffered heavily from several environmental impacts as a result of the current drought conditions. The first of these is on its forests. The US Forest Service estimates that 12 million trees have died in the past year due to drought; this combined with the drying of forest floor material greatly increases the flammability of the landscape. The result of this is the numerous devastating wildfires that have swept through the state throughout 2015, costing not only wildlife and habitat but also human property (CBS News, 2015) (Lustgarten, et al., 2015) (Google, 2015). Aside from wildfires, the drought and associated loss of habitat is said to be having a negative effect on both flora and fauna due to their contribution to the spread of West Nile Virus, whilst also threatening populations of geese, ducks, salmon and Joshua trees (Lustgarten, et al., 2015) (Beaudry, 2015). Finally, with groundwater contributing up to 50% of stream flow in drought, there is a worry that over usage near the coast could result in irreversible salinization through the drawing in of salt water (USGS, 2016) (Kasler & Reese, 2015).

Brooks (EPA), J. Heinrichs (UW), S. McMillin (California Department of Fish and Wildlife) and C. Wilsey (UW). Landuse change scenarios were developed by Jim Thorne and the Information Center for the Environment at UC Davis. The information in this document has been funded in part by the U.S. Environmental Protection Agency. It has been subjected to review by the National Health and Environmental Effects Research Laboratory’s Western Ecology Division and approved for publication. Approval does not signify that the contents reflect the views of the Agency, nor does mention of trade names or commercial products constitute endorsement or recommendation for

Studies have repeatedly shown that as oxygen concentrations decrease, the abundance and diversity of fish decrease (Breitburg). Fish kills, in which large numbers of dead and dying fish float to the surface or wash onto shore, are probably the most dramatic and publicly visible manifestation of hypoxia and nutrient over-enrichment of coastal waters(Breitburg). In addition to mass mortalities that are easily observed, high mortality of fish lacking a swim bladder can occur leaving little or no visible evidence of fish at the surface or littering beaches (Breitburg). With no fish, shrimp, or crabs the Louisiana fishing market takes a huge hit that the economy feels in a major way. The gulf accounts for almost one-fifth of the countries fishing landings, which total to be three billion dollars (Petrolia). Fishing is not only a major part of Louisiana’s economy but also its culture. Without wildlife in our waters microorganism are given more opportunity to grow leading to bacteria infected waters. These bacteria infected waters could cause major health risks for those who come in contact with

Water resources in the state of California have deteriorated drastically as a result of the current drought event in the west coast of the United States. This has resulted in insufficient supplies of water to residents of southern California, as well as the devastation of wildlife and aquatic ecosystems that are characteristic of this area. This policy analysis will provide the context of the issue, as well as possible solutions, followed by a proposed policy plan to reach the policy goal of equitable and reliable water allocation in the state of California, drought resilience, as well as restoration of the destroyed ecosystems.

The Impact of Hydropower Dams on California's Populations of Anadromous Fish: What can be done to mitigate the Dams Effects and Restore California's Watersheds.

Historically, this region was host to communities of Native Americans (East West Gateway Council of Governments, 2007, Leland, 1953). The abundance of freshwater and navigable rivers has attracted communities of people, and subsequently, commerce (Foley, 2000). Naturally, resources throughout the land have been extracted and utilized to further build these communities and attract prospective businesses. In the 19th century, this watershed was impacted by mining, logging, and grazing practices. In the early 20th century, logging dominated resource extraction (East West Gateway Council of Governments, 2007) which swiftly impacted the landscape. Ultimately, as logging stressed this region’s resources, state legislation allowed the federal government to purchase large tracts of land to establish national forest. Soon after, the national mobilization of the Civilian Conservation Corps, during the height

An Average of 1.6 trillion gallons of water are extracted from the Delta for the Central Valley Project and State Water Project on an annual basis (Holyoke). With so much demand, the Delta’s ecological balance has been deeply affected. Furthermore, water supplies and local uses are considered to be in crisis due to crashing number of fish species and old weak levees (Lund, et al.) It is feared that during a strong regional earthquake, many of the levees would fail. Due to the increasing demand on water supplies, conservation efforts, and hundreds of interests, the Delta is also the jugular of California’s water

One of the problems is that Lake Tahoe is losing water clarity. Its water clarity has decreased by more than thirty-three percent since 1960s and may become irreversible in ten years if change is not going to come soon (Programs to Preserve). Building, roads, and mines affected the original look of the environment. There is no way of going back and bringing Lake Tahoe to how it originally looked. Trees had to be cut in order to make the roads and mines had to be dug. Thus causing less habitat for the animals to live in. Many animals get killed by vehicles driving on the roads; causing animals to get killed when they otherwise would have not of gotten killed if there were no roads. Black bears also get killed frequently by rangers when they should have not been touched at all. Black bears rely on human waste for food and often stuff themselves with newspapers (Keep Tahoe Blue). Lake Tahoe’s moto is “Keep Tahoe Blue”. Meaning “…a crystal clear Lake, protecting watersheds that support native plants and forests and abundant wildlife, an active and informed community of residents and visitors who act as stewards of the Lake…” (Keep Tahoe Blue). Efforts are being done to help improve the conditions of Lake Tahoe’s ecosystems. It is the little steps that make the big

The Asian clam, Corbicula fluminea, is an invasive freshwater bivalve that is found in many streams, rivers, lakes, and reservoirs around the world (Bullard & Hershey, 2013). Originally native to Southeast Asia, it has had large ecological and economic impacts in many aquatic ecosystems (as cited in Gulyás, Sümegi, Szalóki, & Nenadic, 2012). Its asexual behavior, lack of need for a host, and strong sense of adaptability are the cause of its massive spread. Generally, Corbicula fluminea like warm climates and sandy silt-like substrate to burrow into, both of which can be found in the Laredo section [2304] of the Rio Grande River. This has made the Rio Grande River a prime breeding ground for this invasive species, and in turn has greatly effected