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Effect of global warming on wildlife
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The woolly Mammoth was an herbivorous mammal that lived in the cool and dry open steppe-tundra of the Northern Hemisphere from late Middle Pleistocene or earlier. The woolly mammoth is said to have been about the same height and weight as the Indian elephants, but its overall shape was clearly different. The hind legs were much shorter than the forelegs, which resulted in a distinct slope to the back. The skull was narrower from front to back than those of modern elephants and there was a large dome on the top. As specified by its name, the woolly mammoth had a dense coat of hair and its outer layer consisted of long, coarse guard hairs, while a dense layer of fine wool lay underneath. The ears of the woolly mammoth were also relatively small unlike that of its tropical descendants, due to the climate it lived in. As a result of its small ears the surface area of skin open to the elements was minimized. The tusks were significantly larger than those of modern elephants, sometimes exceeding 13.5 ft. in length. The Woolly Mammoth’s tusks were presumably a sexually selected characteristic: males who possessed longer and more impressive tusks were able to mate with more females. The tusks were also used as defense mechanisms against predators such as the saber-tooth tiger.
The earliest mammoths were recorded about 4 million years ago from several localities in Africa. Between 3 to 3.5 million years ago mammoths expanded into Europe. The first non-African species, the southern mammoth also known as Mammuthus meridionalis extended throughout much of Eurasia and entered North America in the early Pleistocene. It was about 14 ft. at the shoulder and lived in woodlands feeding mainly on tree and shrub browse. This extensively distributed ...
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...n but well preserved remain of a baby mammoth was found on the frozen Yuribei river. Another species of mammoth known as the Colombian mammoth has been found in places such as the Olympic peninsula and Oklahoma.
Works Cited
"Mammoth Mystery."On NET. Trailside Museum of Natural History, n.d. Web. 29 Dec. 2013.
Nogués-Bravo, David, Jesús Rodríguez, Joaquín Hortal, Persaram Batra,, and Miguel B. Araújo. "Climate Change, Humans, and the Extinction of the Woolly Mammoth."PLOS Biology:. N.p., 1 Apr. 2008. Web. 29 Dec. 2013.
"Waking The Baby Mammoth | Nat Geo Wild."Waking The Baby Mammoth | Nat Geo Wild. N.p., n.d. Web. 29 Dec. 2013.
"Washington State Fossil - Columbian Mammoth."Washington State Fossil - Columbian Mammoth. N.p., n.d. Web. 29 Dec. 2013.
"Woolly Mammoth (Mammuthus Primigenius)."Web.archive.org. The Academy of Natural Sciences, n.d. Web. 27 Dec. 2013.
The majestic ranges of western North America – the Rockies, the Sierra Nevada, the cascades, and the Coast Ranges – arose more recently.
-New Evidence Puts Man in North America 50,000 Years Ago. Sciencedaily. 2004. Retrieved from http://www.sciencedaily.com/releases/2004/11/041118104010.htm
Robbins, Jim. Last Refuge: The Environmental Showdown in Yellowstone and the American West. New York: Morrow, 1993. Print.
The re-wilding of North America is basically a conservation strategy (Donlan 2005), aimed at restoring the Pleistocene era (Donlan 2005, Rubenstein et al. 2006). This could be achieved by reintroducing African and Asian megafauna, these species are phylogenetically known to be direct descendents of the extinct Pleistocene species or animals of similar taxa (Donlan 2005, Rubenstein et al. 2006). Re-populating North America is essential for both ecological and evolutionary potential (Donlan 2005) and also economic gain (Donlan 2005, Rubenstein et al. 2006). In this paper I will be discussing the main arguments presented by two papers regarding the Pleistocene North America re-wilding. The first paper is written by Donlan (2005), it is a commentary paper in which he proposes the plan of re-wilding North America based on his opinions. The second paper is by Rubenstein et al. (2006), it is a research paper where he outlines some facts contrary to Donlan (2005)’s paper, unlike Donlan (2005)‘s paper his arguments were supported by variety of recent Scientific published papers which are relevant to the topic discussed.
Americas by 14,000 ago” (O’Brien 12), after large portions of North America encountered the last ice age, which
Rapidly evolving throughout the late Pleistocene to the early to mid Holocene, hunter-gatherer-fisher societies hunted megafauna creatures in a systematic and ethical way. When one species migrates to a different ecosystem, that species is not usually recognized as a threat to other species. Survival, during the late Pleistocene and Holocene era, was one of the most important aspects to life. Any organism, regardless of size, living within their environment had to stay alive and reproduce. During these two eras, it seems...
The most widely understood theory of human beginnings in the Americas involves a land bridge that would have “extended over what is now the Bering Strait and linked north-eastern Siberia to Alaska.” A migration of this sort would have necessarily occurred prior to 9,500 BCE during the last of Earth’s glacial maximums. During this glacial period the sea levels would have been relatively low, exposing the areas of Beringia that are currently underwater. This land bridge — as it is often referred — would have supported large herds of several species of megafauna, such as mammoth, bison, and horses. Paleolithic hunters and gatherers could have easily followed these herds out of the Eurasian tundra and into North America.
Wong first discusses the possibility that harsh climate killed the last Neandertals. Analysis of isotopes in ocean sediments, ice, and in pollen from the time of the Neandertals reveals that during a period known as oxygen isotope stage 3 (OIS-3), which occurred about 65,000 to 25,000 years ago, there was a climate shift, from moderate to glacial. However, this was probably not what killed the Neandertals, due to the fact that Neandertal anatomy was even better suited for colder climates, with their shorter limbs, barrel chest, and short stature better at conserving body heat (lecture). It is more likely that the severe and rapid environmental shift resulted in the demise of the Neandertals, which could have resulted in a change from forests to grasslands and a change in plants and animals in a short period of time, even over the lifetime of one individual, and just as quickly it could have changed back. The Neandertals, therefore, would have had to adjust to the new environment quickly in order to survive.
Percy, Benjamin. "The Caves in Oregon," “Meltdown,” “When the Bear Came.” Refresh, Refresh. Saint Paul, MN: Graywolf, 2007. 21-41, 101-132, 225-49. Print.
The Pleistocene epoch was a time period of almost 2 million years of repeating glaciation around the globe. This epoch was known for its megafauna that roamed the Earth during the last great ice age. Although this was a time of mass extinction for species that could not adapt to the climate changes, many mammals and vertebrates that can be identified today were found during this time (Zimmermann, 2013). The Pleistocene epoch is an important foundation for understanding life that exists today, including carnivores, herbivores as well as the evolution of humans.
The Woolly Mammoth saw periods of glaciation, when temperatures were reduced, and the Earth entered an Ice Age. They lived in dry northern ecosystems which they were well adapted to with their characteristic long shaggy coat. However, most of the time there were periods of snow. They are also associated with grassy plains which. Although the grass was not very nutritious, they grew in large enough amounts that it became part of their diet. They also fed on saplings of trees such as birch. Because of a grown Woolly Mammoth’s size and sheer strength, the Woolly Mammoth didn’t have many predators. Those who were preyed upon were juvenile wooly mammoths who were targeted by big cats like Homotheriums and, later, the early
King, N. (2009, June 20). Wolves in Yellowstone: A Short History | wolves | issues. Yellowstone Insider: Your Complete Guide to America's First National Park. Retrieved July 20, 2010, from http://www.yellowstoneinsider.com/issues/wolves/wolves-in-yellowstone-a-short-history.php
With global warming on the increase and species habitats on the decrease, the chances for various ecosystems to adapt naturally are diminishing. Many studies have pointed out that the rates of extinction of animal and plant species and the temperature changes around the world since the industrial revolution have been significantly different to normal expectations.
Thousands of species have become extinct over the last four decades as a result of changes in land use and as a result of global warming. Whether or not the millions of species can adapt and evolve to climate changes is debatable. As this brief overview will report, the human species is not adapting well to the changes. It must be remembered that increases in the levels of carbon dioxide are certainly responsible for the risk many species face, but so is the way land is used, e.g., rain forest destruction. There is a feedback loop wherein plant life and the climate are interdependent. Each affects the other. When forests are cut down, temperatures in that area will rise. Rising temperatures cause other plant life requiring cooler temperatures To die off.