Forest and human life essay

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forest and human life essay

Kayapo way of, life, essay - 999 Palabras Cram

The primary reasons for this are human hunting and habitat loss from early aridification, both of which persist and threaten Madagascar's remaining taxa today. Citation needed The eight or more species of elephant birds, giant flightless ratites in the genera aepyornis and Mullerornis, are extinct from over-hunting, 60 as well as 17 species of lemur, known as giant, subfossil lemurs. Some of these lemurs typically weighed over 150 kilograms (330 lb and fossils have provided evidence of human butchery on many species. 61 New zealand edit main article: List of extinct animals of New zealand see also: biodiversity of New zealand, timeline of the new zealand environment, and Invasive species in New zealand New zealand is characterised by its geographic isolation and island biogeography, and had been. It was the last large land mass to be colonised by humans. The arrival of Polynesian settlers circa 12th century resulted in the extinction of all of the islands' megafaunal birds within several hundred years. 62 The last moa, large flightless ratites, became extinct within 200 years of the arrival of human settlers. 14 The polynesians also introduced the polynesian rat.

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6 The extent human arrival contributed is controversial; climatic drying of Australia 40,00060,000 years ago was an unlikely cause, as it was less severe in speed or magnitude than previous regional climate change which failed to kill off megafauna. Extinctions in Australia continued from original settlement until today in both plants and animals, whilst many more animals and plants have declined or are endangered. 55 due to the older timeframe and the soil chemistry on the continent, very little subfossil preservation evidence exists relative to elsewhere. 56 However, continent-wide extinction of all genera weighing over 100 kilograms, and six of seven genera weighing between 45 pollution and 100 kilograms occurred around 46,400 years ago (4,000 years after human arrival) 57 and the fact that megafauna survived until a later date on the. The first evidence of direct human predation leading to extinction in Australia was published in 2016. 53 Madagascar edit further information: Wildlife of Madagascar and Subfossil lemur letter Radiocarbon dating of multiple subfossil specimens shows that now extinct giant lemurs were present in Madagascar until after human arrival. Within 500 years of the arrival of humans between 2,5002,000 years ago, nearly all of Madagascar's distinct, endemic and geographically isolated megafauna became extinct. 59 The largest animals, of more than 150 kilograms (330 lb were extinct very shortly after the first human arrival, with large and medium-sized species dying out after prolonged hunting pressure from an expanding human population moving into more remote regions of the island around 1000. Smaller fauna experienced initial increases due to decreased competition, and then subsequent declines over the last 500 years. 15 All fauna weighing over 10 kilograms (22 lb) died out.

53 The first settlers are thought to have arrived in the islands between 300 and lab 800 ce, with European arrival in the 16th century. Hawaii is notable for its endemism of plants, birds, insects, mollusks and fish ; 30 of its organisms are endemic. Many of its species are endangered or have gone extinct, primarily due to accidentally introduced species and livestock grazing. Over 40 of its bird species have gone extinct, and it is the location of 75 of extinctions in the United States. 54 Extinction has increased in Hawaii over the last 200 years and is relatively well documented, with extinctions among native snails used as estimates for global extinction rates. 21 Australia edit main articles: Australian megafauna, list of extinct animals of Australia, and List of extinct flora of Australia see also: Invasive species in Australia, land clearing in Australia, and Fire-stick farming Australia was once home to a large assemblage of megafauna, with many. Australia's fauna is characterised by primarily marsupial mammals, and many reptiles and birds, all existing as giant forms until recently. Humans arrived on the continent very early, about 50,000 years ago.

forest and human life essay

Amphibians, essay - 2007 Palabras Cram

29 48 Islands edit human arrival in the caribbean around 6,000 years ago is correlated with the extinction of many species. 49 Examples include many different genera of ground and arboreal sloths across all islands. These sloths were plan generally smaller than those found on the south American continent. Megalocnus were the largest genus at up to 90 kilograms (200 lb Acratocnus were medium-sized relatives of modern two-toed sloths endemic to cuba, imagocnus also fruit of Cuba, neocnus and many others. 50 Recent research, based on archaeological and paleontological digs on 70 different Pacific islands has shown that numerous species became extinct as people moved across the pacific, starting 30,000 years ago in the bismarck Archipelago and Solomon Islands. 51 It is currently estimated that among the bird species of the pacific, some 2000 species have gone extinct since the arrival of humans, representing a 20 drop in the biodiversity of birds worldwide. 52 Genyornis newtoni, a 2-metre (7 ft) tall flightless bird. Evidence of egg cooking in this species is the first evidence of megafaunal hunting by humans on Australia.

41 Studies on early hunter-gatherers raises questions about the current use of population size or density as a proxy for the amount of land clearance and anthropogenic burning that took place in pre-industrial times. 46 47 Scientists have questioned the correlation between population size and early territorial alterations. 47 Ruddiman and Ellis' research paper in 2009 makes the case that early farmers involved in systems of agriculture used more land per capita than growers later in the holocene, who intensified their labor to produce more food per unit of area (thus, per laborer. 41 While a number of human-derived factors are recognized as potentially contributing to rising atmospheric concentrations of CH4 (methane) and CO2 (carbon dioxide deforestation and territorial clearance practices associated with agricultural development may be contributing most to these concentrations globally. Scientists that are employing a variance of archaeological and paleoecological data argue that the processes contributing to substantial human modification of the environment spanned many thousands of years ago on a global scale and thus, not originating as early as the Industrial revolution. Gaining popularity on his uncommon hypothesis, palaeoclimatologist William Ruddiman in 2003, stipulated that in the early holocene 11,000 years ago, atmospheric carbon dioxide and methane levels fluctuated in a pattern which was different from the Pleistocene epoch before. He argued that the patterns of the significant decline of CO2 levels during the last ice age of the Pleistocene inversely correlates to the holocene where there have been dramatic increases of co years ago and ch years after that. 48 The correlation between the decrease of CO2 in the Pleistocene and the increase of it during the holocene implies that the causation of this spark of greenhouse gases into the atmosphere was the growth of human agriculture during the holocene such as the anthropogenic.

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forest and human life essay

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37 Although significant debate exists as to how much human predation and indirect effects contributed to prehistoric extinctions, certain population favourite crashes have been directly correlated with human arrival. 13 6 23 A 2018 study published in pnas found that since the dawn of minnesota human civilization, 83 of wild mammals, 80 of marine mammals, 50 of plants and 15 of fish have vanished. Currently, livestock make up 60 of all mammals on earth, followed by humans (36) and wild mammals (4). As for birds, 70 are domesticated, such as poultry, whereas only 30 are wild. 38 39 Agriculture edit human civilization flourished in accordance to the efficiency and intensification of prevailing subsistence systems. 41 Local communities that acquire more subsistence strategies increased in number to combat competitive pressures of land utilization.

29 41 Therefore, the holocene developed competition on the basis of agriculture. The growth of agriculture has then introduced newer means of climate change, pollution, and ecological development. 42 Habitat destruction by humans, including oceanic devastation, such as through overfishing and contamination; and the modification and destruction of vast tracts of land and river systems around the world to meet solely human-centered ends (with 13 percent of Earth's ice-free land surface now used. 44 Other, related human causes of the extinction event include deforestation, hunting, pollution, 45 the introduction in various regions of non-native species, and the widespread transmission of infectious diseases spread through livestock and crops. 3 Recent investigations about hunter-gatherer landscape burning has a major implication for the current debate about the timing of the Anthropocene and the role that humans may have played in the production of greenhouse gases prior to the Industrial revolution.

29 Other commentators place the holoceneAnthropocene boundary at the industrial revolution while also saying that, "formal adoption of this term in the near future will largely depend on its utility, particularly to earth scientists working on late holocene successions." It has been suggested that human. 31 32 In order to constitute the holocene as an extinction event, scientists must determine exactly when anthropogenic greenhouse gas emissions began to measurably alter natural atmospheric levels at a global scale and when these alterations caused changes to global climate. Employing chemical proxies from Antarctic ice cores, researchers have estimated the fluctuations of carbon dioxide (CO2) and methane gases (CH4) in the earths atmosphere for the late Pleistocene and Holocene epochs. 29 Based on studies that estimated fluctuations of carbon dioxide and methane in the atmosphere using chemical proxies from Antarctic ice cores, general argumentation of when the peak of the Anthropocene occurred pertains to the timeframe within the previous two centuries; typically beginning with the. 33 34 Influences edit competition by humans edit see also: Megafaunal mass extinctions and quaternary extinction event The percent of megafauna on different land masses over time, with the arrival of humans indicated. The holocene extinction is mainly caused by human activity.


Extinction of animals, plants, and other organisms caused by human actions may go as far back as the late Pleistocene, over 12,000 years ago. 23 There is a correlation between megafaunal extinction and the arrival of humans, and human overpopulation and human population growth, along with overconsumption and consumption growth, most prominently in the past two centuries, are regarded as one of the underlying causes of extinction. Megafauna were once found on every continent of the world and large islands such as New zealand and Madagascar, but are now almost exclusively found on the continent of Africa, with notable comparisons on Australia and the islands previously mentioned experiencing population crashes and trophic. 14 15 It has been suggested that the African megafauna survived because they evolved alongside humans. 6 The timing of south American megafaunal extinction appears to precede human arrival, although the possibility that human activity at the time impacted the global climate enough to cause such an extinction has been suggested. 6 It has been noted, in the face of such evidence, that humans are unique in ecology as an unprecedented 'global superpredator regularly preying on large numbers of fully grown terrestrial and marine apex predators, and with a great deal of influence over food webs.

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19 Theoretical ecologist Stuart Pimm stated, for plants, the extinction rate is 100 times higher than normal. 20 In a pair of studies published in 2015, extrapolation from observed extinction of Hawaiian snails led to the conclusion that 7 of all species on Earth may have been lost already. 21 22 While there is widespread consensus in the scientific community that human activity is accelerating the extinction of many animal species through the destruction of wild lands, the consumption of animals as resources or luxuries, and the persecution of species that humans view. Stuart Pimm, for example, asserts that the sixth mass extinction "is something that hasnt happened yet we are on the edge." 24 In november 2017, a statement, titled " World Scientists Warning to humanity: a second Notice led by eight authors and signed. "Anthropocene" is a term introduced in 2000. It is now posited by some that a new geological epoch has begun, characterised by the most abrupt and widespread extinction of species since the CretaceousPaleogene extinction event 66 million years ago. 6 The term "anthropocene" is being used more frequently by scientists, and some commentators may refer to the current and projected future extinctions as part of a longer Holocene extinction. 27 28 The holoceneAnthropocene boundary is contested, with some commentators asserting significant human influence on climate for much of what is normally regarded as the holocene Epoch.

forest and human life essay

In many cases, it is suggested even minimal book hunting pressure was enough to wipe out large fauna, particularly on geographically isolated islands. 14 15 Only during the most recent parts of the extinction have plants also suffered large losses. 16 In The future of Life (2002 Edward Osborne wilson of Harvard calculated that, if the current rate of human disruption of the biosphere continues, one-half of Earth's higher lifeforms will be extinct by 2100. A 1998 poll conducted by the American Museum of Natural History found that seventy percent of biologists acknowledge an ongoing anthropogenic extinction event. 17 At present, the rate of extinction of species is estimated at 100 to 1,000 times higher than the background extinction rate, the historically typical rate of extinction (in terms of the natural evolution of the planet) 2 3 18 and also the current rate. One scientist estimates the current extinction rate may be 10,000 times the background extinction rate. Nevertheless, most scientists predict a much lower extinction rate than this outlying estimate.

on the adults of other apex predators and has worldwide effects on food webs. Extinctions of species have occurred on every land mass and ocean, with many famous examples within Africa, asia, europe, australia, north and south America, and on smaller islands. Overall, the holocene extinction can be characterized by the human impact on the environment. The holocene extinction continues into the 21st century, with meat consumption, overfishing, ocean acidification and the decline in amphibian populations being a few broader examples of an almost universal, cosmopolitan decline in biodiversity. Human overpopulation (and continued population growth ) along with profligate consumption are considered to be the primary drivers of this rapid decline. 4 5 Contents Definitions edit The holocene extinction is also known as the "sixth extinction due to its possibly being the sixth mass extinct event, after the OrdovicianSilurian extinction events, the late devonian extinction, the permianTriassic extinction event, the TriassicJurassic extinction event, and the CretaceousPaleogene. Mass extinctions are characterized by the loss of at least 75 of species within a geologically short period of time. 10 11 There is no general agreement on where the holocene, or anthropogenic, extinction begins, and the quaternary extinction event, which includes climate change resulting in the end of the last ice age, ends, or if they should be considered separate events at all. 12 13 Some have suggested that anthropogenic extinctions may have begun as early as when the first modern humans spread out of Africa between 100,000 and 200,000 years ago, which is supported by rapid megafaunal extinction following recent human colonisation in Australia, new zealand and.

Megafauna outside of the. African continent, which did not evolve alongside humans, proved highly sensitive to the introduction of new predation, and many died out shortly after early humans began spreading and hunting across the earth (additionally, many. African species have also gone extinct in the holocene ). These extinctions, occurring near the Pleistocene holocene boundary, are sometimes referred to as the quaternary extinction event. The arrival of humans on different continents coincides with megafaunal extinction. The most popular theory is that human overhunting of species added to existing stress conditions. Although there is debate regarding how much human predation affected their decline, certain population declines have been directly correlated with human activity, such as the extinction events of New zealand and Hawaii.

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"Sixth Extinction" redirects here. For other uses, see. The, holocene extinction, otherwise referred to as the. Sixth extinction or, anthropocene extinction, is the ongoing extinction event of species during the present, holocene epoch, mainly as a result of human activity. 1, the large number of extinctions spans numerous families of plants and animals, friendship including mammals, birds, amphibians, reptiles and arthropods. With widespread degradation of highly biodiverse habitats such as coral reefs and rainforests, as well as other areas, the vast majority of these extinctions are thought to be undocumented, as no one is even aware of the existence of the species before they go extinct. The current rate of extinction of species is estimated at 100 to 1,000 times higher than natural background rates. 2 3, the holocene extinction includes the disappearance of large land animals known as megafauna, starting at the end of the last Ice Age.


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