Habitat destruction

Source: Wikipedia, the free encyclopedia.

Map of the world's biodiversity hot spots, all of which are heavily threatened by habitat loss and degradation

Habitat destruction (also termed habitat loss and habitat reduction) occurs when a natural habitat is no longer able to support its native species. The organisms once living there have either moved to elsewhere or are dead, leading to a decrease in biodiversity and species numbers.[1][2] Habitat destruction is in fact the leading cause of biodiversity loss and species extinction worldwide.[3]

Humans contribute to habitat destruction through the use of natural resources, agriculture, industrial production and urbanization (urban sprawl). Other activities include mining, logging and trawling. Environmental factors can contribute to habitat destruction more indirectly. Geological processes, climate change,[2] introduction of invasive species, ecosystem nutrient depletion, water and noise pollution are some examples. Loss of habitat can be preceded by an initial habitat fragmentation. Fragmentation and loss of habitat have become one of the most important topics of research in ecology as they are major threats to the survival of endangered species.[4]

Observations

By region

deforestation in Bolivia. Originally dry tropical forest, the land is being cleared for soybean cultivation.[5]

Environmentally Sensitive Area (ESA) Rank 1 wetland is one such example, with irreversible reclamation proceeding prior to environmental impact assessment and approvals. Other such areas include the eastern coasts of Asia and Africa, northern coasts of South America, and the Caribbean Sea and its associated islands.[7]

Regions of un

Amazonian tropical rainforest areas of South America are the main regions with unsustainable agricultural practices and/or government mismanagement.[7]

Areas of high agricultural output tend to have the highest extent of habitat destruction. In the U.S., less than 25% of native vegetation remains in many parts of the East and Midwest.[8] Only 15% of land area remains unmodified by human activities in all of Europe.[7]

Currently, changes occurring in different environments around the world are changing the specific geographical habitats that are suitable for plants to grow. Therefore, the ability for plants to migrate to suitable environment areas will have a strong impact on the distribution of plant diversity. However, at the moment, the rates of plant migration that are influenced by habitat loss and fragmentation are not as well understood as they could be.[9]

By type of ecosystem

Jungle burned for agriculture in southern Mexico

Tropical rainforests have received most of the attention concerning the destruction of habitat. From the approximately 16 million square kilometers of tropical rainforest habitat that originally existed worldwide, less than 9 million square kilometers remain today.[7] The current rate of deforestation is 160,000 square kilometers per year, which equates to a loss of approximately 1% of original forest habitat each year.[10]

Other forest

cattle ranching than tropical rainforests; consequently, less than 0.1% of dry forests in Central America's Pacific Coast and less than 8% in Madagascar remain from their original extents.[10]

Farmers near newly cleared land within Taman Nasional Kerinci Seblat (Kerinci Seblat National Park), Sumatra

Plains and

scrub, and deciduous forests, have been somewhat degraded.[11] But included in that 10–20% of land is the approximately 9 million square kilometers of seasonally dry-lands that humans have converted to deserts through the process of desertification.[7] The tallgrass prairies of North America, on the other hand, have less than 3% of natural habitat remaining that has not been converted to farmland.[12]

green turtle
nesting beaches.

mangrove ecosystems worldwide have been destroyed.[16]

Natural causes

Forest in Grands-Jardins National Park 10 years after a forest fire occurred[17]

Habitat destruction through natural processes such as volcanism, fire, and climate change is well documented in the fossil record.[2] One study shows that habitat fragmentation of tropical rainforests in Euramerica 300 million years ago led to a great loss of amphibian diversity, but simultaneously the drier climate spurred on a burst of diversity among reptiles.[2]

Causes due to human activities

Habitat destruction caused by humans includes

land conversion from forests, etc. to arable land, urban sprawl, infrastructure development, and other anthropogenic changes to the characteristics of land. Habitat degradation, fragmentation, and pollution are aspects of habitat destruction caused by humans that do not necessarily involve over destruction of habitat, yet result in habitat collapse. Desertification, deforestation, and coral reef degradation are specific types of habitat destruction for those areas (deserts, forests, coral reefs).[citation needed
]

Overarching drivers

The forces that cause humans to destroy habitat are known as drivers of habitat destruction.

Demographic, economic, sociopolitical, scientific and technological, and cultural drivers all contribute to habitat destruction.[16]

Demographic drivers include the

biodiversity hotspots.[6] This may explain why human population density accounts for 87.9% of the variation in numbers of threatened species across 114 countries, providing indisputable evidence that people play the largest role in decreasing biodiversity.[18] The boom in human population and migration of people into such species-rich regions are making conservation efforts not only more urgent but also more likely to conflict with local human interests.[6] The high local population density in such areas is directly correlated to the poverty status of the local people, most of whom lacking an education and family planning.[19]

According to the Geist and Lambin (2002) study, the underlying driving forces were prioritized as follows (with the percent of the 152 cases the factor played a significant role in): economic factors (81%), institutional or policy factors (78%), technological factors (70%), cultural or socio-political factors (66%), and

property rights and land-tenure insecurity (44%); and policy failures such as corruption, lawlessness, or mismanagement (42%). The main technological factor was the poor application of technology in the wood industry
(45%), which leads to wasteful logging practices. Within the broad category of cultural and sociopolitical factors are public attitudes and values (63%), individual/household behavior (53%), public unconcern toward forest environments (43%), missing basic values (36%), and unconcern by individuals (32%). Demographic factors were the in-migration of colonizing settlers into sparsely populated forest areas (38%) and growing population density—a result of the first factor—in those areas (25%).

Forest conversion to agriculture

Further information: Deforestation
The rate of global tree cover loss has approximately doubled since 2001, to an annual loss approaching an area the size of Italy.[20]
The period since 1950 has brought "the most rapid transformation of the human relationship with the natural world in the history of humankind".[21] Almost one-third of the world's forests, and almost two-thirds of its grassland, have been lost to human agriculture—which now occupies almost half the world's habitable land.[22]

Geist and Lambin (2002) assessed 152 case studies of net losses of tropical forest cover to determine any patterns in the proximate and underlying causes of tropical deforestation. Their results, yielded as percentages of the case studies in which each parameter was a significant factor, provide a quantitative prioritization of which proximate and underlying causes were the most significant. The proximate causes were clustered into broad categories of

construction of new roads) is the largest single proximate factor responsible for deforestation.[19]

Habitat size and numbers of species are systematically related. Physically larger species and those living at lower latitudes or in forests or oceans are more sensitive to reduction in habitat area.[23] Conversion to "trivial" standardized ecosystems (e.g., monoculture following deforestation) effectively destroys habitat for the more diverse species. Even the simplest forms of agriculture affect diversity – through clearing or draining the land, discouraging weeds and pests, and encouraging just a limited set of domesticated plant and animal species.[23]

There are also feedbacks and interactions among the proximate and underlying causes of deforestation that can amplify the process. Road construction has the largest feedback effect, because it interacts with—and leads to—the establishment of new settlements and more people, which causes a growth in wood (logging) and food markets.[19] Growth in these markets, in turn, progresses the commercialization of agriculture and logging industries. When these industries become commercialized, they must become more efficient by utilizing larger or more modern machinery that often has a worse effect on the habitat than traditional farming and logging methods. Either way, more land is cleared more rapidly for commercial markets. This common feedback example manifests just how closely related the proximate and underlying causes are to each other.[24]

Climate change

See also: Effects of climate change and Effects of climate change on biomes
Decline in arctic sea ice extent (area) from 1979 to 2022
Decline in arctic sea ice volume from 1979 to 2022

Climate change contributes to destruction of some habitats, endangering various species. For example:

  • Climate change causes rising sea levels which will threaten natural habitats and species globally.[25][26]
  • Melting sea ice destroys habitat for some species.[27]: 2321  For example, the decline of sea ice in the Arctic has been accelerating during the early twenty‐first century, with a decline rate of 4.7% per decade (it has declined over 50% since the first satellite records).[28][29][30] One well known example of a species affected is the polar bear, whose habitat in the Artic is threatened.[31] Algae can also be affected when it grows on the underside of sea ice.[32]
  • coastal protection and food. But 70–90% of today's warm-water coral reefs will disappear even if warming is kept to 1.5 °C (2.7 °F).[33]: 179  For example, Caribbean coral reefs – which are biodiversity hotspots – will be lost within the century if global warming continues at the current rate.[34]

Habitat fragmentation

This section is an excerpt from Habitat fragmentation.[edit]
geological processes that slowly alter the layout of the physical environment[36] (suspected of being one of the major causes of speciation[36]), and human activity such as land conversion, which can alter the environment much faster and causes the extinction of many species. More specifically, habitat fragmentation is a process by which large and contiguous habitats get divided into smaller, isolated patches of habitats.[37][38]

Impacts

On animals and plants

When a habitat is destroyed, the

indigenous plants, animals, and other organisms is reduced so that populations decline, sometimes up to the level of extinction.[39]

Habitat loss is perhaps the greatest threat to organisms and biodiversity.

infertile youths, as these organisms would have a higher possibility of mating with related organisms within their population, or different species. One of the most famous examples is the impact upon China's giant panda, once found in many areas of Sichuan. Now it is only found in fragmented and isolated regions in the southwest of the country, as a result of widespread deforestation in the 20th century.[43]

As habitat destruction of an area occurs, the species diversity offsets from a combination of habitat generalists and specialists to a population primarily consisting of generalist species.[3] Invasive species are frequently generalists that are able to survive in much more diverse habitats.[44] Habitat destruction leading to climate change offsets the balance of species keeping up with the extinction threshold leading to a higher likelihood of extinction.[45]

Habitat loss is one of the main environmental causes of the decline of biodiversity on local, regional, and global scales. Many believe that habitat fragmentation is also a threat to biodiversity however some believe that it is secondary to habitat loss.[46] The reduction of the amount of habitat available results in specific landscapes that are made of isolated patches of suitable habitat throughout a hostile environment/matrix. This process is generally due to pure habitat loss as well as fragmentation effects. Pure habitat loss refers to changes occurring in the composition of the landscape that causes a decrease in individuals. Fragmentation effects refer to an addition of effects occurring due to the habitat changes.[4] Habitat loss can result in negative effects on the dynamic of species richness. The order Hymenoptera is a diverse group of plant pollinators who are highly susceptible to the negative effects of habitat loss, this could result in a domino effect between the plant-pollinator interactions leading to major conservation implications within this group.[47] It is observed from the worlds longest running fragmentation experiment over 35 years that habitat fragmentation has caused a decrease in biodiversity from 13% to 75%. [48]

On human population

Gulf Coast contributed to severe flooding in New Orleans, Louisiana, in the aftermath of Hurricane Katrina in 2005.[49]

Habitat destruction can vastly increase an area's vulnerability to

water contamination.[16][page needed] On the other hand, a healthy ecosystem with good management practices can reduce the chance of these events happening, or will at least mitigate adverse impacts.[50] Eliminating swamps—the habitat of pests such as mosquitoes—has contributed to the prevention of diseases such as malaria.[51]
Completely depriving an infectious agent (such as a virus) of its habitat—by vaccination, for example—can result in eradicating that infectious agent.[52]

Agricultural land can suffer from the destruction of the surrounding landscape. Over the past 50 years, the destruction of habitat surrounding agricultural land has degraded approximately 40% of agricultural land worldwide via erosion, salinization, compaction, nutrient depletion, pollution, and urbanization.[16] Humans also lose direct uses of natural habitat when habitat is destroyed. Aesthetic uses such as birdwatching, recreational uses like hunting and fishing, and ecotourism usually[quantify] rely upon relatively undisturbed habitat. Many[quantify] people value the complexity of the natural world and express concern at the loss of natural habitats and of animal or plant species worldwide.[53]

Probably the most profound impact that habitat destruction has on people is the loss of many valuable

ecosystem services. Habitat destruction has altered nitrogen, phosphorus, sulfur, and carbon cycles, which has increased the frequency and severity of acid rain, algal blooms, and fish kills in rivers and oceans and contributed tremendously to global climate change.[16][need quotation to verify] One ecosystem service whose significance is becoming better understood is climate regulation. On a local scale, trees provide windbreaks and shade; on a regional scale, plant transpiration recycles rainwater and maintains constant annual rainfall; on a global scale, plants (especially trees in tropical rainforests) around the world counter the accumulation of greenhouse gases in the atmosphere by sequestering carbon dioxide through photosynthesis.[7] Other ecosystem services that are diminished or lost altogether as a result of habitat destruction include watershed management, nitrogen fixation, oxygen production, pollination (see pollinator decline),[54]
agricultural runoff.[7]

The loss of trees from tropical rainforests alone represents a substantial diminishing of Earth's ability to produce oxygen and to use up carbon dioxide. These services are becoming even more important as increasing

fungi, viruses, and bacteria.[7]

The negative effects of habitat destruction usually impact rural populations more directly than urban populations.[16] Across the globe, poor people suffer the most when natural habitat is destroyed, because less natural habitat means fewer natural resources per capita, yet wealthier people and countries can simply pay more to continue to receive more than their per capita share of natural resources.

Another way to view the negative effects of habitat destruction is to look at the opportunity cost of destroying a given habitat. In other words, what do people lose out on with the removal of a given habitat? A country may increase its food supply by converting forest land to row-crop agriculture, but the value of the same land may be much larger when it can supply natural resources or services such as clean water, timber, ecotourism, or flood regulation and drought control.[16][need quotation to verify]

Outlook

The rapid expansion of the global human population is increasing the world's food requirement substantially. Simple logic dictates that more people will require more food. In fact, as the world's population increases dramatically, agricultural output will need to increase by at least 50%, over the next 30 years.[56] In the past, continually moving to new land and soils provided a boost in food production to meet the global food demand. That easy fix will no longer be available, however, as more than 98% of all land suitable for agriculture is already in use or degraded beyond repair.[57]

The impending global

food crisis will be a major source of habitat destruction. Commercial farmers are going to become desperate to produce more food from the same amount of land, so they will use more fertilizers and show less concern for the environment to meet the market demand. Others will seek out new land or will convert other land-uses to agriculture. Agricultural intensification will become widespread at the cost of the environment and its inhabitants. Species will be pushed out of their habitat either directly by habitat destruction or indirectly by fragmentation, degradation, or pollution. Any efforts to protect the world's remaining natural habitat and biodiversity will compete directly with humans' growing demand for natural resources, especially new agricultural lands.[56]

Solutions

Attempts to address habitat destruction are in international policy commitments embodied by Sustainable Development Goal 15 "Life on Land" and Sustainable Development Goal 14 "Life Below Water". However, the United Nations Environment Programme report on "Making Peace with Nature" released in 2021 found that most of these efforts had failed to meet their internationally agreed upon goals.[58]

Tropical deforestation: In most cases of

tropical deforestation, three to four underlying causes are driving two to three proximate causes.[19] This means that a universal policy for controlling tropical deforestation would not be able to address the unique combination of proximate and underlying causes of deforestation in each country.[19] Before any local, national, or international deforestation policies are written and enforced, governmental leaders must acquire a detailed understanding of the complex combination of proximate causes and underlying driving forces of deforestation in a given area or country.[19]
This concept, along with many other results of tropical deforestation from the Geist and Lambin study, can easily be applied to habitat destruction in general.

Shoreline erosion: Coastal erosion is a natural process as storms, waves, tides and other water level changes occur. Shoreline stabilization can be done by barriers between land and water such as seawalls and bulkheads. Living shorelines are gaining attention as a new stabilization method. These can reduce damage and erosion while simultaneously providing ecosystem services such as food production, nutrient and sediment removal, and water quality improvement to society[59]

Example of human caused habitat destruction likely capable of reversing if further disturbance is halted. Uganda.
Pivers Island, North Carolina
Natural vegetation along this coastal shoreline in North Carolina, US, is being used to reduce the effects of shoreline erosion while providing other benefits to the natural ecosystem and the human community.

Preventing an area from losing its specialist species to generalist invasive species depends on the extent of the habitat destruction that has already taken place. In areas where the habitat is relatively undisturbed, halting further habitat destruction may be enough.

restoration ecology may be needed.[60]

Education of the general public is possibly the best way to prevent further human habitat destruction.[61] Changing the dull creep of environmental impacts from being viewed as acceptable to being seen a reason for change to more sustainable practices.[61] Education about the necessity of family planning to slow population growth is important as greater population leads to greater human caused habitat destruction.[62] Habitat restoration can also take place through the following processes; extending habitats or repairing habitats.[63] Extending habitats aims to counteract habitat loss and fragmentation whereas repairing habitats counteracts degradation.[63]

The preservation and creation of habitat corridors can link isolated populations and increase pollination.[64] Corridors are also known to reduce the negative impacts of habitat destruction.[64]

The biggest potential to solving the issue of habitat destruction comes from solving the political, economical and social problems that go along with it such as, individual and commercial material consumption,[61] sustainable extraction of resources,[65] conservation areas,[61] restoration of degraded land[66] and addressing climate change.[45]

Governmental leaders need to take action by addressing the underlying driving forces, rather than merely regulating the proximate causes. In a broader sense, governmental bodies at a local, national, and international scale need to emphasize:

  1. Considering the irreplaceable
    ecosystem services
    provided by natural habitats.
  2. Protecting remaining intact sections of natural habitat.
  3. Finding ecological ways to increase agricultural output without increasing the total land in production.
  4. Reducing
    contraception globally, furthering gender equality
    also has a great benefit. When women have the same education (decision-making power), this generally leads to smaller families.

It is argued that the effects of habitat loss and fragmentation can be counteracted by including spatial processes in potential restoration management plans. However, even though spatial dynamics are incredibly important in the conservation and recovery of species, a limited amount of management plans are taking the spatial effects of habitat restoration and conservation into consideration.[67]

See also

Notes

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  6. ^ a b c Cincotta & Engelman, 2000.
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  14. ^ "United Kingdom: Environmental Issues, Policies and Clean Technology". AZoCleantech.com. 8 June 2015. Archived from the original on 30 March 2019. Retrieved 12 December 2017.
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  17. ^ "File:Burnt forest GJ.jpg", Wikipedia, archived from the original on 23 July 2021, retrieved 18 March 2021
  18. ^ McKee et al., 2003.
  19. ^ a b c d e f Geist & Lambin, 2002.
  20. ^ Butler, Rhett A. (31 March 2021). "Global forest loss increases in 2020". Mongabay. Archived from the original on 1 April 2021. ● Mongabay graphing WRI data from "Forest Loss / How much tree cover is lost globally each year?". research.WRI.org. World Resources Institute — Global Forest Review. 2023. Archived from the original on 2 August 2023.
  21. ^ Steffen, Will; Sanderson, Angelina; Tyson, Peter; Jäger, Jill; et al. (2004). "Global Change and the Climate System / A Planet Under Pressure" (PDF). International Geosphere-Biosphere Programme (IGBP). pp. 131, 133. Archived (PDF) from the original on 19 March 2017. Fig. 3.67(j): loss of tropical rainforest and woodland, as estimated for tropical Africa, Latin America and South and Southeast Asia.
  22. ^ "Deforestation and Forest Loss / Humanity destroyed one third of the world's forests by expanding agricultural land". Our World in Data (OWID). Archived from the original on 7 November 2022. Data: Historical data on forests from Williams (2003) - Deforesting the Earth. Historical data on agriculture from The History Database of Global Environment (HYDE). Modern data from the FAO
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  51. Pontine marshes
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  52. ^
    ISBN 9781845939649
    . Retrieved 30 September 2021. The eradication of smallpox virus [...] is also a perfect example of habitat destruction: smallpox vaccination gives life-long immunity, and humans are the only host. Mass vaccination therefore resulted in total elimination of the habitat of the virus.
  53. ^ "Valuing nature". World Wildlife Foundation. WWF. Archived from the original on 25 April 2021. Retrieved 15 April 2021.
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References

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