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s nitrogen mineralization others convert ammonium to nitrite and nitrate ions a process known as nitrification nitric oxide and nitrous oxide are also produced during nitrification 20 277 under nitrogen rich and oxygen poor conditions nitrates and nitrites are converted to nitrogen gas a process known as denitrification 20 281 mycorrhizal fungi which are symbiotic with plant roots use carbohydrates supplied by the plants and in return transfer phosphorus and nitrogen compounds back to the plant roots 29 30 this is an important pathway of organic nitrogen transfer from dead organic matter to plants this mechanism may contribute to more than 70 tg of annually assimilated plant nitrogen thereby playing a critical role in global nutrient cycling and ecosystem function 30 phosphorus enters ecosystems through weathering as ecosystems age this supply diminishes making phosphorus limitation more common in older landscapes especially in the tropics 20 287 290 calcium and sulfur are also produced by weathering but acid deposition is an important source of sulfur in many ecosystems although magnesium and manganese are produced by weathering exchanges between soil organic matter and living cells account for a significant portion of ecosystem fluxes potassium is primarily cycled between living cells and soil organic matter 20 291 function and biodiversity main article biodiversity see also ecosystem diversity loch lomond in scotland forms a relatively isolated ecosystem the fish community of this lake has remained stable over a long period until a number of introductions in the 1970s restructured its food web 31 spiny forest at ifaty madagascar featuring various adansonia baobab species alluaudia procera madagascar ocotillo and other vegetation biodiversity plays an important role in ecosystem functioning 32 449 453 ecosystem processes are driven by the species in an ecosystem the nature of the individual species and the relative abundance of organisms among these species ecosystem processes are the net effect of the actions of individual organisms as they interact with their environment ecological theory suggests that in order to coexist species must have some level of limiting similarity they must be different from one another in some fundamental way otherwise one species would competitively exclude the other 33 despite this the cumulative effect of additional species in an ecosystem is not linear additional species may enhance nitrogen retention for example however beyond some level of species richness 11 331 additional species may have little additive effect unless they differ substantially from species already present 11 324 this is the case for example for exotic species 11 321 the addition or loss of species that are ecologically similar to those already present in an ecosystem tends to only have a small effect on ecosystem function ecologically distinct species on the other hand have a much larger effect similarly dominant species have a large effect on ecosystem function while rare species tend to have a small effect keystone species tend to have an effect on ecosystem function that is disproportionate to their abundance in an ecosystem 11 324 an ecosystem engineer is any organism that creates significantly modifies maintains or destroys a habitat 34 study approaches ecosystem ecology main article ecosystem ecology see also ecosystem model a hydrothermal vent is an ecosystem on the ocean floor the scale bar is 1 m ecosystem ecology is the study of the interactions between organisms and their environment as an integrated system 2 458 the size of ecosystems can range up to ten orders of magnitude from the surface layers of rocks to the surface of the planet 4 6 the hubbard brook ecosystem study started in 1963 to study the white mountains in new hampshire it was the first successful attempt to study an entire watershed as an ecosystem the study used stream chemistry as a means of monitoring ecosystem properties and developed a detailed biogeochemical model of the ecosystem 35 long term research at the site led to the discovery of acid rain in north america in 1972 researchers documented the depletion of soil cations especially calcium over the next several decades 36 ecosystems can be studied through a variety of approaches theoretical studies studies monitoring specific ecosystems over long periods of time those that look at differences between ecosystems to elucidate how they work and direct manipulative experimentation 37 studies can be carried out at a variety of scales ranging from whole ecosystem studies to studying microcosms or mesocosms simplified representations of ecosystems 38 american ecologist stephen r carpenter has argued that microcosm experiments can be irrelevant and diversionary if they are not carried out in conjunction with field studies done at the ecosystem scale in such cases microcosm experiments may fail to accurately predict ecosystem level dynamics 39 classifications further information ecosystem classification and biogeoclimatic ecosystem classification biomes are general classes or categories of ecosystems 4 14 however there is no clear distinction between biomes and ecosystems 40 biomes are always defined at a very general level ecosystems can be described at levels that range from very general in which case the names are sometimes the same as those of biomes to very specific such as wet coastal needle leafed forests biomes vary due to global variations in climate biomes are often defined by their structure at a general level for example tropical forests temperate grasslands and arctic tundra 4 14 there can be any degree of subcategories among ecosystem types that comprise a biome e g needle leafed boreal forests or wet tropical forests although ecosystems are most commonly categorized by their structure and geography there are also other ways to categorize and classify ecosystems such as by their level of human impact see anthropogenic biome or by their integration with social processes or technological processes or their novelty e g novel ecosystem each of these taxonomies of ecosystems tends to emphasize different structural or functional properties 41 none of these is the best classification ecosystem classifications are specific kinds of ecological classifications that consider all four elements of the definition of ecosystems a biotic component an abiotic complex the interactions between and within them and the physical space they occupy 41 different approaches to ecological classifications have been developed in terrestrial freshwater and marine disciplines and a function based typology has been proposed to leverage the strengths of these different approaches into a unified system 42 human interactions with ecosystems human activities are important in almost all ecosystems although humans exist and operate within ecosystems their cumulative effects are large enough to influence external factors like climate 4 14 ecosystem goods and services the high peaks wilderness area in the 6 000 000 acre 2 400 000 ha adirondack park is an example of a diverse ecosystem main articles ecosystem services and ecological goods and services see also ecosystem valuation and ecological yield ecosystems provide a variety of goods and services upon which people depend 43 ecosystem goods include the tangible material products of ecosystem processes such as water food fuel construction material and medicinal plants 44 45 they also include less tangible items like tourism and recreation and genes from wild plants and animals that can be used to improve domestic species 43 ecosystem services on the other hand are generally improvements in the condition or location of things of value 45 these include things like the maintenance of hydrological cycles cleaning air and water the maintenance of oxygen in the atmosphere crop pollination and even things like beauty inspiration and opportunities for research 43 while material from the ecosystem had traditionally been recognized as being the basis for things of economic value ecosystem services tend to be taken for granted 45 the millennium ecosystem assessment is an international synthesis by over 1000 of the world s leading biological scientists that analyzes the state of the earth s ecosystems and provides summaries and guidelines for decision makers the report identified four major categories of ecosystem services provisioning regulating cultural and supporting services 46 it concludes that human activity is having a significant and escalating impact on the biodiversity of the world ecosystems reducing both their resilience and biocapacity the report refers to natural systems as humanity s life support system providing essential ecosystem services the assessment measures 24 ecosystem services and concludes that only four have shown improvement over the last 50 years 15 are in serious decline and five are in a precarious condition 46 6 19 the intergovernmental science policy platform on biodiversity and ecosystem services ipbes is an intergovernmental organization established to improve the interface between science and policy on issues of biodiversity and ecosystem services 47 48 it is intended to serve a similar role to the intergovernmental panel on climate change 49 ecosystem services are limited and also threatened by human activities 50 to help inform decision makers many ecosystem services are being assigned economic values often based on the cost of replacement with anthropogenic alternatives the ongoing challenge of prescribing economic value to nature for example through biodiversity banking is prompting transdisciplinary shifts in how we recognize and manage the environment social responsibility business opportunities and our future as a species 50 degradation and decline see also ecosystem collapse biodiversity loss and effects of climate change on biomes as human population and per capita consumption grow so do the resource demands imposed on ecosystems and the effects of the human ecological footprint natural resources are vulnerable and limited the environmental impacts of anthropogenic actions are becoming more apparent problems for all ecosystems include environmental pollution climate change and biodiversity loss for terrestrial ecosystems further threats include air pollution soil degradation and deforestation for aquatic ecosystems threats also include unsustainable exploitation of marine resources for example overfishing marine pollution microplastics pollution the effects of climate change on oceans e g warming and acidification and building on coastal areas 51 many ecosystems become degraded through human impacts such as soil loss air and water pollution habitat fragmentation water diversion fire suppression and introduced species and invasive species 52 437 these threats can lead to abrupt transformation of the ecosystem or to gradual disruption of biotic processes and degradation of abiotic conditions of the ecosystem once the original ecosystem has lost its defining features it is considered collapsed see also iucn red list of ecosystems 53 ecosystem collapse could be reversible and in this way differs from species extinction 54 quantitative assessments of the risk of collapse are used as measures of conservation status and trends management main articles ecosystem management ecosystem based management and ecosystem approach when natural resource management is applied to whole ecosystems rather than single species it is termed ecosystem management 55 although definitions of ecosystem management abound there is a common set of principles which underlie these definitions a fundamental principle is the long term sustainability of the production of goods and services by the ecosystem 52 intergenerational sustainability is a precondition for management not an afterthought 43 while ecosystem management can be used as part of a plan for wilderness conservation it can also be used in intensively managed ecosystems 43 see for example agroecosystem and close to nature forestry restoration and sustainable development see also restoration ecology integrated conservation and development projects icdps aim to address conservation and human livelihood sustainable development concerns in developing countries together rather than separately as was often done in the past 52 445 see also earth sciences portal ecology portal environment portal complex system earth science ecoregion ecological resilience ecosystem based adaptation artificialization ecosystem structure types the following articles are types of ecosystems for particular types of regions or zones aquatic ecosystem freshwater ecosystem lake ecosystem lentic ecosystem river ecosystem lotic ecosystem marine ecosystem large marine ecosystem tropical salt pond ecosystem terrestrial ecosystem boreal ecosystem groundwater dependent ecosystems montane ecosystem urban ecosystem ecosystems grouped by condition agroecosystem closed ecosystem depauperate ecosystem novel ecosystem reference ecosystem instances this list is incomplete you can help by adding missing items april 2023 main category ecosystems by region ecosystem instances in specific regions of the world greater yellowstone ecosystem leuser ecosystem longleaf pine ecosystem renosterveld tarangire ecosystem references hatcher bruce gordon 1990 coral reef primary productivity a hierarchy of pattern and process trends in ecology and evolution 5 5 149 155 bibcode 1990tecoe 5 149h doi 10 1016 0169 5347 90 90221 x pmid 21232343 1 2 3 4 5 chapin f stuart iii 2011 glossary principles of terrestrial ecosystem ecology p a matson peter morrison vitousek melissa c chapin 2nd ed new york springer isbn 978 1 4419 9504 9 oclc 755081405 1 2 3 tansley a g 1935 the use and abuse of vegetational concepts and terms pdf ecology 16 3 284 307 bibcode 1935ecol 16 284t doi 10 2307 1930070 jstor 1930070 archived from the original pdf on 2016 10 06 1 2 3 4 5 6 7 8 9 10 chapin f stuart iii 2011 chapter 1 the ecosystem concept principles of terrestrial ecosystem ecology p a matson peter morrison vitousek melissa c chapin 2nd ed new york springer isbn 978 1 4419 9504 9 oclc 755081405 odum eugene p 1971 fundamentals of ecology third ed new york saunders isbn 978 0 534 42066 6 willis a j 1997 the ecosystem an evolving concept viewed historically functional ecology 11 2 268 271 doi 10 1111 j 1365 2435 1997 00081 x tansley a g 1939 the british islands and their vegetation cambridge university press 1 2 3 chapin f stuart iii 2011 chapter 5 carbon inputs to ecosystems principles of terrestrial ecosystem ecology p a matson peter morrison vitousek melissa c chapin 2nd ed new york springer isbn 978 1 4419 9504 9 oclc 755081405 chapin f stuart iii 2011 chapter 2 earth s climate system principles of terrestrial ecosystem ecology p a matson peter morrison vitousek melissa c chapin 2nd ed new york springer isbn 978 1 4419 9504 9 oclc 755081405 1 2 chapin 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