Human Ecosystems

Human ecosystems are complex cybernetic systems that are increasingly being used by ecological anthropologists and other scholars to examine the ecological aspects of human communities in a way that integrates multiple factors as economics, socio-political organization, psychological factors, and physical factors related to the environment.

Central to the ecosystem concept is the idea that living organisms are continually engaged in a set of relationships with every other element constituting the environment in which they exist. The human ecosystem concept is then grounded in the deconstruction of the human/nature dichotomy, and the emergent premise that all species are ecologically integrated with each other, as well as with the abiotic constituents of their biotope. Ecosystems can be bounded and discussed with tremendous variety of scope, and describe any situation where there is relationship between organisms and their environment.

A system as small as a household or university, or as large as a nation state, may then be suitably discussed as a human ecosystem. While they may be bounded and individually discussed, (human) ecosystems do not exist independently, but interact in a complex web of human and ecological relationships connecting all (human) ecosystems to make up the biosphere. As virtually no surface of the earth today is free of human contact, all ecosystems are pimpin can be more accurately considered as human ecosystems.

The human ecosystem concept draws from disciplines such as ecology, anthropology, sociology, philosophy, political science, cybernetics, and psychology, seeking to understand the complex system of relationships in which humans interact. These relationships exist within nested hierarchies of context with which individuals and human aggregates interact with differentially. Most analysis of human ecosystems focuses on particular contexts of relationship, such as biological, individual, socio-cultural, environmental et cetera.

Human ecosystems as complex cybernetic systems
Work by scholars such as Roy Rappaport, Gregory Bateson, and E.N Anderson has focused of transfer and transformation of information in human ecosystems. Inquiries as such have focused on the ecological and informational aspects of relationships in human ecosystems. In Steps to an Ecology of Mind (1972) Bateson discusses information as pattern and difference within complex cybernetic systems. In the 1990s Edwin Hutchins developed a school of psychology known as distributed cognition, which draws heavily from anthropology and sociology, emphasizing the social aspects of cognition. Distributed cognition is directly applicable to studies of human ecosystems, considering systems as sets of representations, and modeling the interchange of information between these representations. These representations can be either in the mental space of the participants or external representations available in the environment. In Cognition in the Wild (1994) Hutchins considers information processing within a bounded human ecosystem in a discussion of distributed cognition on board a naval vessel.

Aquatic Ecosystem

An aquatic ecosystem is an ecosystem located in water bodies. Communities of organisms that are dependent on each other and on their environment live in aquatic ecosystems. The two main types of aquatic ecosystems are marine ecosystems and freshwater ecosystems.


Marine
Marine ecosystems cover approximately 71% of the Earth's surface and contain approximately 97% of the planet's water. They generate 32% of the world's net primary production. They are distinguished from freshwater ecosystems by the presence of dissolved compounds, especially salts, in the water. Approximately 85% of the dissolved materials in seawater are sodium andchlorine. Seawater has an average salinity of 35 parts per thousand (ppt) of water. Actual salinity varies among different marine ecosystems.

Marine ecosystems can be divided into the following zones: oceanic (the relatively shallow part of the ocean that lies over thecontinental shelf); profundal (bottom or deep water); benthic (bottom substrates); intertidal (the area between high and low tides);estuaries; salt marshes; coral reefs; and hydrothermal vents (where chemosynthetic sulfur bacteria form the food base).

Classes of organisms found in marine ecosystems include brown algae, dinoflagellates, corals, cephalopods, echinoderms, andsharks. Fish caught in marine ecosystems are the biggest source of commercial foods obtained from wild populations.

Environmental problems concerning marine ecosystems include unsustainable exploitation of marine resources (for exampleoverfishing of certain species), water pollution, and building on coastal areas

Freshwater
Freshwater ecosystems cover 0.8% of the Earth's surface and contain 0.009% of its total water. They generate nearly 3% of its net primary production. Freshwater ecosystems contain 41% of the world's known fish species.

There are three basic types of freshwater ecosystems:
Lentic: slow-moving water, including pools, ponds, and lakes.
Lotic: rapidly-moving water, for example streams and rivers.
Wetlands: areas where the soil is saturated or inundated for at least part of the time.

Lake ecosystems can be divided into zones: pelagic (open offshore waters); profundal; littoral (nearshore shallow waters); and riparian (the area of land bordering a body of water). Two important subclasses of lakes are ponds, which typically are small lakes that intergrade with wetlands, and water reservoirs. Many lakes, or bays within them, gradually become enriched by nutrients and fill in with organic sediments, a process called eutrophication. Eutrophication is accelerated by human activity within the water catchment area of the lake.

The major zones in river ecosystems are determined by the river bed's gradient or by the velocity of the current. Faster moving turbulent water typically contains greater concentrations of dissolved oxygen, which supports greater biodiversity than the slow moving water of pools. These distinctions forms the basis for the division of rivers into upland and lowland rivers. The food base of streams within riparian forests is mostly derived from the trees, but wider streams and those that lack a canopy derive the majority of their food base from algae. Anadromous fish are also an important source of nutrients. Environmental threats to rivers include loss of water, dams, chemical pollution and introduced species. Wetlands are dominated by vascular plants that have adapted to saturated soil. Wetlands are the most productive natural ecosystems because of the proximity of water and soil. Due to their productivity, wetlands are often converted into dry land with dykes and drains and used for agricultural purposes. Their closeness to lakes and rivers means that they are often developed for human settlement.

Functions

Aquatic ecosystems perform many important environmental functions. For example, they recycle nutrients, purify water, attenuate floods, recharge ground water and provide habitats for wildlife. Aquatic ecosystems are also used for human recreation, and are very important to the tourism industry, especially in coastal regions.

The health of an aquatic ecosystem is degraded when the ecosystem's ability to absorb a stress has been exceeded. A stress on an aquatic ecosystem can be a result of physical, chemical or biological alterations of the environment. Physical alterations include changes in water temperature, water flow and light availability. Chemical alterations include changes in the loading rates of biostimulatory nutrients, oxygen consuming materials, and toxins. Biological alterations include the introduction of exotic species. Human populations can impose excessive stresses on aquatic ecosystems.

Ecosystems

Ecosystem is a natural unit consisting of all plants, animals and micro-organisms in an area functioning together with all of the non-living physical of the environment.

The ecosystem concept is the idea that living organisms are continually engaged in a set of highly interrelated relationships with every other element constituting the environment in which they exist. In a given area interacting with the physical environment so that a flow of energy leads to clearly defined trophic structure, biotic diversity, and material cycles within the system is an ecosystem."The human ecosystem concept is then grounded in the deconstruction of the human/nature dichotomy, and the emergent premise that all species are ecologically integrated with each other, as well as with the abiotic constituents of their biotope.
Ecosystems can be bounded and discussed with tremendous variety of scope, and describe any situation where there is relationship between organisms and their environment. If humans are part of the organisms, one can speak of a 'human ecosystem'. As virtually no surface of the earth today is free of human contact, all ecosystems can be more accurately considered as human ecosystems, or more neutrally as human-influenced ecoystems.

Examples :

1. Aquatic ecosystem
2. Chaparral
3. Coral reef
4. Desert
5. Greater Yellowstone Ecosystem
6. Human ecosystem
7. Large marine ecosystem
8. Littoral zone
9. Marine ecosystem
10. Rainforest
11. Savanna
12. Subsurface Lithoautotrophic Microbial Ecosystem
13. Taiga
14. Tundra
15. Urban ecosystem

National Park

National park is a reserve of land, usually declared and owned by a national government, protected from most human development and pollution. National parks are protected areas of IUCN category II.

Some countries also designate sites of special cultural, scientific or historical importance as national parks, or as special entities within their national park systems. Other countries use a different scheme for historical site preservation. Some of these sites, if they meet the criteria required, are awarded the title World Heritage Site by the UNESCO. In many countries, local government bodies may be responsible for the maintenance of park systems. Some of these are also called national parks.

Features preserved
National parks are usually located in places which have been largely undeveloped, and often feature areas with exceptional native animals, plants and ecosystems (particularly endangered examples of such), biodiversity, or unusual geological features. Occasionally, national parks are declared in developed areas with the goal of returning the area to resemble its original state as closely as possible.

In some countries, such as England and Wales, areas designated as a national park are not wilderness, nor owned by the government, and can include substantial settlements and land uses which are often integral parts of the landscape

Park mandates
Most national parks have a dual role as offering a refuge for wildlife and as serving as popular tourist areas. Managing the potential for conflict between these two roles can become problematic, particularly as tourists often generate revenue for the parks which, in turn, are spent on conservation projects. Parks also serve as reserves for substantial natural resources, such as timber, minerals and other valuable commodities. The balance of the demand for extraction of these resources, against the damage this might cause, is often a very important challenge in national park management. National parks have been subject to illegal logging and other exploitation, sometimes because of political corruption, or lack of law enforcement. For example, Lorentz National Park in Indonesia has no dedicated staff of guards. This threatens the integrity of many valuable habitats. Another example of indifference to wildlife conservation is the Romanian Parliament's discussions in September 2008 to open thirteen national parks to commercial hunting, in order to eliminate the wildlife from these areas. It is the first step toward an alleged dismantling of national parks in Romania and transformation into human settled areas

Wilderness

Wilderness is generally defined as a natural environment on Earth that has not been significantly modified by human activity. Wilderness areas and protected parks are considered important for the survival of certain species, ecological studies, conservation, solitude, and recreation. Wilderness is deeply valued for cultural, spiritual, moral, and aesthetic reasons. Some nature writers believe wilderness areas are vital for the human spirit and creativity. The word, "wilderness", derives from the notion of "wildness"; in other words that which is not controllable by humans. The word's etymology is from the Old English wildeornes, which in turn derives from wildeor meaning wild beast (wild + deor = beast, deer) (The Collins English Dictionary, 2000). From this point of view, it is the wildness of a place that makes it a wilderness. The mere presence or activity of people does not disqualify an area from being "wilderness." Many ecosystems that are, or have been, inhabited or influenced by activities of people may still be considered "wild." This way of looking at wilderness includes areas within which natural processes operate without human interference.
Large wilderness parks are currently protected by law and enforcement in many countries. Many new parks are currently being planned and legally passed by various Parliaments and Legislatures.

Conceptions of wilderness
Looked at through the lens of the visual arts, nature and wildness have been important subjects in various epochs of world history. An early tradition of landscape art occurred in the Tang Dynasty (618-907). The tradition of representing nature as it is became one of the aims of Chinese painting and was a significant influence in Asian art. Artists in the tradition of Shan shui (lit. mountain-water-picture), learned to depict mountains and rivers "from the perspective of nature as a whole and on the basis of their understanding of the laws of nature… as if seen through the eyes of a bird.” In the 13th century, Shih Erh Chi recommended avoiding painting "scenes lacking any places made inaccessible by nature. "The idea of wilderness having intrinsic value emerged in the Western world in the 1800s. British artists John Constable and JMW Turner turned their attention to capturing the beauty of the natural world in their paintings. Prior to that, paintings had been primarily of religious scenes or of human beings. William Wordsworth’s poetry described the wonder of the natural world, which had formerly been viewed as a threatening place. Increasingly the valuing of nature became an aspect of Western culture.
Wilderness was traditionally viewed as being a place to fear and avoid. It was the place where monsters and the unknown existed. Over the course of the 19th century wilderness became to be viewed not as a place to fear but a place to enjoy and protect, hence came the conservation movement in the latter half of the 19th century. Rivers were rafted and mountains were climbed solely for the sake of recreation, not to determine their geographical contexture. This was a profound shift in wilderness thought. It reached a pinnacle in the US in the 1960s with the passage of the Wilderness Act of 1964, that allowed for parts of U.S. National Forests to be designated as "wilderness preserves."
The 21st century has seen another slight shift in wilderness thought and theory. It is now understood that simply drawing lines around a piece of land and declaring it a wilderness does not necessarily make it a wilderness. All landscapes are intricately connected and what happens outside a wilderness certainly affects what happens inside it. For example, pollution from Los Angeles and the California Central Valley smog up Kern Canyon and Sequoia National Park. The national park has miles of "wilderness" but the air is filled with pollution from the valley. This then brings us to the paradox of what a wilderness really is, which is precisely the issue in 21st century wilderness thought.