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The impact of human activities on the environment
The impact of human activities on the environment
The impact of human activities on the environment
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Madagascar is a Dying Land In Need of Help
Madagascar is one of the most diverse areas of land that has undergone evolution totally independent from surrounding continents. The plant and animal species located on the island are all endemic to the island, meaning all are native species. The amount of diversity is very high compared to that of other continents and the species found here cannot be found anywhere else in the world. Currently all organisms located on this island are in danger, even the humans. Much damage has already been done, yet each year the land seems to die even more. Many species are dying off rapidly and drastic measures will have to be taken to stop all of these species from becoming extinct.
All problems for this island arose with the introduction of humans. According to fossil records, humans arrived approximately 2000 years ago. With their arrival came destruction, a destruction that would continue until present day. They were not aware of their actions at the time and how they would forever change the ecosystem of Madagascar.
The most destructive problem that occurred a hundred years ago and is still practiced is that of tavy. Tavy is a process of forest clearing, also known as slash and burn. Humans living on the island use this system to create farmland for harvesting their most precious crops. What they do is they cut down all trees and or shrubs then set fire to the area of land that they want to farm. They use the burnt materials as fertilizers and then plant their crop. Next season the farmer must move to another area and continue to burn more of the forest down. Due to this form of farming, humans have turned vast wetlands into deserts and luscious forests into tundra. In the...
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...lies in the hands of education. Knowledge is Power.
Bibliography:
Works Consulted
Glander, Dr. Kenneth. What's a Lemur? The PBS website.
Godfrey, Dr. Laurie. Isolation and Biodiversity. The PBS website.
Howes, Oliver. "Environmentally friendly health care begins in Madagascar." The Lancet. February 21, 1998: 577.
Middleton, Karen. "Who killed 'Malagasy Cactus'? Science, environment and colonialism in southern Madagascar (1924-1930)." Journal of Southern African Studies; Oxford. June 1999: 215-248.
Morell, Virginia. "Restoring Madagascar." National Geographic. February 1999: 60-71.
Morell Virginia. "In Search of Solutions." National Geographic. February 1999: 76-84.
Kremen, Dr. Claire. Traditions That Threaten. The PBS website.
Raxworthy, Christopher. A Truly Bizarre Lizard. The PBS website.
The inspiring documentary film, E.O. Wilson—Of Ants and Men, showcases biologist Edward Osborne Wilson’s passion for preserving the biodiversity of our natural world. E.O. Wilson not only values the fascinating creatures (particularly ants) that he comes across during his research and in his daily life, but he also takes action and participates in the Gorongosa Restoration Project at Gorongosa National Park in Mozambique, Africa. The destruction of Gorongosa demonstrates the call for us—Homo sapiens—to realize how critical it is to concern ourselves with protecting the very ecosystems that have molded us into the complex species that we are; according to E.O. Wilson, “We adapted over millions of years to wild environments…We really need them” (CITE?). The better effort we make to understand that we are a part of this large, interdependent ecological community, the better equipped we become in not only being
is the cause of all of the problems that take place on the island. At
World Health Organization, 3 September 2007. Web. The Web. The Web. 4 Apr 2011.
Presently, the rate of species extinction is occurring several thousand times faster than has been observed over geologic time. (Purvis, E., & Mace, 2000) Though they represent a minority of all species, island species make up 75% of animal extinctions since the 16 000's. Because of traits inherent to islands, including isolation and small geographic range (Purvis, E., & Mace, 2000), islands are more susceptible to extinction than the continents. This results in a disproportionate ratio of island to continental extinctions. For example, 20% of the world's bird species inhabit islands, but of historical bird extinctions, about 90% were islanders (Frankham, 1997). With the endemicity that follows island isolation (particularly oceanic islands) often comes a direct correlation between local and global extinction. Low population numbers add to the threat of extinction. Generally, the more endemic a population, the greater the extinction rate (Purvis, E., & Mace, 2000). In the absence of mammalian or reptilian predators, unique island species do not develop the evolutionary experience required to cope with alien species upon their introduction. In New Zealand, the extinction rate of bird species is positively correlated to its level of endemicity (Duncan & Blackburn, 2007). This endemicity lends itself to the development of traits which increase their susceptibility to predation, especially large size, flightlessness and prey naiveté. Of island extinctions over the past 50 000 years, human activities (eg. invasion, alteration of environment, over-exploitation, etc.) have been the primary cause (Duncan & Blackburn, 2007). Also cited as attributing to the extinction of island species is inbreeding depression (Frankham, 1997).
To better understand how Madagascar has been impacted, a brief understanding of pre-colonial Madagascar is required. To begin with, archaeologists have come to estimate that the first settlers in Madagascar arrived in the time period between 350 B.C. and 550 A.D., while others have serious doubts about dates earlier than 420 A.D., which is the vaguely recorded date for the earliest human presence in Madagascar. This leads into the assumption that Madagascar was one of the last landmasses on the planet that was settled by humans. Based on my research, some of the groups that arrived hundreds of years before European colonialism were the Arabs, who first ...
Despite the lost coral islets and atolls, the islands have extremely fertile soil. However, certain conditions do affect development. The islands are small with fixed boundaries and are occupied by tens of thousands of people. Irrigation is not possible, limiting their agricultural capabilities to dryland field systems. Being in the middle of the ocean leaves them susceptible to natural disasters such as cyclones and droughts (Kirch 1984: 221).
The Government and mining industry is designed to make the public believe that the area that has been destroyed can be regenerated or rehabilitated back to its former state. Although this can be done and trees and other plants are able to grow, the natural ecosystems can not be regrown (Savestraddie.com, 2018). Excessive instream sand-and-gravel mining causes the degradation of rivers. Depletion of sand in the streambed and along coastal areas causes the deepening of rivers and estuaries, and the enlargement of river mouths and coastal inlets. It may also lead to saline-water intrusion from the nearby sea (Environmental Information System, 2013). In addition, although Sibelco states they try to re-establish the original ecosystem, that occupied the island before they begun mining in the area, the ecosystem and plantation will never be the same as it was. With the stopping of sand mining, there will be no further depletion of the vegetation and the ecosystem will be able to grow safely and restore the natural ecosystem, and places that have not been demolished yet, will be safe from destruction from 2019 and onwards. At
Madagascar is extremely different place from what I am used to in California. The people of Madagascar, called Madagascans live their lives in very unique ways. Their government, ecosystem, landforms, history, economy, culture, and everyday life are dissimilar to ours, while their climate is actually somewhat similar.
The rainforests of Madagascar is home to many different animals. One of the animals that live in the forests of Madagascar is the lemur. 1 Lemurs live in high in the treetops. They spend most of their time in the trees and they get everything that they need from the trees such as food and shelter. Other mammals also call the rainforest home. 1 Mammals such as the fossa, mongoose, and tenrec live in rainforests as well. The fossa hunts for it’s food in the trees. The mongoose hunts among the brush. The tenrec shelters in the trees or among the
No research was cited or referenced when less than two lemurs were studied, also when the lemurs were examined for a time span less than one year. Moreover, any non-lemur frugivores (excluding birds and bats) studies were not considered for review when lacking data with a comparative to lemurs. Morphological and physiological data for aves and bats were reviewed in articles independent from one another. Also, aves bill size and shape were only considered for endemic species in order to maintain a focus on conservation prioritization. Geographical and economic data of Madagascar was referenced by annual updates from reliable sources
The paper, “The Significance and Responsibility of Rehabilitating Drastically Disturbed Land,” by Thadis Bow talks about the concept of drastic disturbance, potential disturbances, and the problems that come with them.
Climate is the main reason that the country of madagascar. The island’s is very vulnerable to many types of natural disasters such as large areas of flooding and extreme drought. Being at such high risk for natural disaster not only devastates and destroys communities it may put fear in the people that inhabit the area because not only are they afraid of the danger ,but also not have the things and materials to get up and leave the place they call home to go to a better place. Flooding in Madagascar has brought polluted water into urban areas causing diseases and sickness among the people that have little to none sanitary ways. Plus as natural resources continue to be abused and not being taken care of properly, the island’s large diverse
The single biggest direct cause of tropical deforestation is conversion to cropland and pasture, mostly for subsistence, which is growing crops or raising livestock to meet daily needs. The conversion to agricultural land usually results from multiple direct factors. For example, countries build roads into remote areas to improve overland transportation of goods. The road development itself causes a limited amount of deforestation. But roads also provide entry to previously inaccessible—and often unclaimed—land. Logging, both legal and illegal, often follows road expansion (and in some cases is the reason for the road expansion). When loggers have harvested an area’s valuable timber, they move on. The roads and the logged areas become a magnet for settlers—farmers and ranchers who slash and burn the remaining forest for cropland or cattle pasture, completing the deforestation chain that began with road building. In other cases, forests that have been degraded by logging become fire-prone and are eventually deforested by repeated accidental fires from adjacent farms or pastures.
Over the past fifty six years, the human population of Madagascar has increased. The main factor that has affected their growth is a density dependant factor of increased birth rate. The population of young people is far larger than the population of elderly. This is because there is a lack of reproductive health education and because the infant mortality rate has decreased by 36 percent. This has caused the population to grow by 20 million in the last fifty six years. However, due to the poverty and lack of resources, the population could begin to decrease. In Madagascar, cattle represents wealth, but now there is too much cattle for the amount of land accessible, so the grazing is causing the island to erode. There is also a lot of deforestation
Madagascar’s culture is very widespread throughout the different ethnic groups living on the island. All eighteen cultural or ethnic groups speak a different dialect of Malagasy, yet they can all understand one another. The Malagasy language traces back to the eastern shores of the Indian Ocean. There are also traces of Bantu, which is a group of languages from Central and Southern ...