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Ecological Infrastructure

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Infrastructure has historically referred to structures built by humans, but since the 1980s there has been a shift in the definition and an increasing focus from many scientists and conservationists on ecological structures and ecosystems as another, distinct, type of infrastructure.[1]

These natural or partly-natural elements of ecosystems, which also play a role in ecosystem delivery, are known as ecological infrastructure.[2] Essentially, one can think of ecological infrastructure as a Nature-based equivalent of buildings, power stations, wastewater treatment plants, and other human-made infrastructure that delivers specific services and supports and drives socio-economic development.[3][4] The services delivered by ecological infrastructure may include things like renewable water, ecological climate regulation, soil formation, and disaster risk reduction, amongst others, while recent studies also emphasise the importance of ecological infrastructure in tackling various issues such as food security, water provision, and poverty alleviation.[4]

Distinction from green infrastructure

While ecological infrastructure is often conflated with green infrastructure,[5] there are a number of significant differences between these two terms, including the fact that the concept of green infrastructure is usually applied in urban environments as opposed to natural ecosystems.[6][7] Green infrastructure is also generally categorised as any infrastructure that provides environmental benefits or is geared towards sustainable development - whether it has natural elements to it or not.[3]

Distinctions between green infrastructure and ecological infrastructure can become blurred, however,[5] because sometimes people refer to specific natural ecosystems and green spaces as green infrastructure. This means that ecological infrastructure may sometimes be considered as a specific component of something more broadly defined as green infrastructure, like a park.[3] However, ecological infrastructure is far better understood as a concept distinct from green infrastructure and environmentally-friendly aspects of built infrastructure.[3]

Examples of Ecological Infrastructure

Pollinator habitats

Research has focused on the ability of certain species of beneficial insects to deliver critical ecosystem services by contributing to pollination and pest control in agricultural areas.[8][9] The variety of natural and semi-natural habitats that support pollinator species and their ability to deliver agricultural pollination can therefore be seen as a good example of ecological infrastructure supporting an ecosystem delivery service. This ecological infrastructure includes hedges, natural grassland, and forested areas that surround or are interspersed with agricultural fields,[6] with one specific strategy being the planting or protection of wildflower areas that support both pollinator species and natural enemies to common agricultural pests.[10]

Estuarine and coastal ecosystems

Estuarine and coastal ecosystems (ECE) provide a variety of ecosystem services and socio-economic benefits. These include acting as a natural sea defence barrier to protect coastlines from erosion by wave, wind, and tide action[11][12], as well as serving as tourist drawcards; climate, air quality and water regulation; and carbon sequestration.[12][13]

The ecosystem services provided by coastal dunes are often overlooked, undervalued,[14] and/or poorly understood.[15] Coastal protection is one of the primary ecosystem services provided by coastal dunes, with variations in their morphology as well as the presence or absence of foredunes and vegetation all contributing to the extent to which dunes can dissipate wave energy.[12] Studies have suggested that the degradation of dunes and the removal of their ecosystem functions contributes to the potential for biological invasions, with one of the mechanisms for this being reduced biodiversity. Dunes at different levels of maturity provide different services, with more mature dunes offering greater regulation and cultural ecosystem services.[16] More dynamic dune systems, meanwhile, safeguard biodiversity and can potentially provide as much as 50% more economic value mainly via recreation and coastal safety maintenance.[17]

Coastal vegetation like mangroves and other forests also play a major role in protecting inland areas from storm events, tsunamis, wind and salt spray, and coastal erosion.[18] Mangroves in particular offer a diverse suite of services, some sustainable and others, like the harvesting of firewood, less so.

In addition to the services provided by individual ECE components, it has been posited that these ecosystems provide a range of cumulative benefits that in combination are much more substantial than those provided by any one component on its own, due to the fact that they are found at the interface between coastal areas, terrestrial environments, and watersheds, highlighting the importance of managing these areas properly.[12] This close interconnectivity requires nuanced conservation and management strategies to maintain the health of all components, as seen by the central role played by seagrass beds[19] and mangroves as nursery grounds for economically and ecologically critical coral reef species.[20][21][22]

Natural landscape corridors and parks in an urban environments

Natural land and water areas existing within cities can provide services including bio-emissions, reductions in air pollution, and carbon sequestration,[23] as well as serving as recreational areas enhancing the physical and mental health of the urban population and providing other cultural services.[24] Studies have also suggested that with careful urban planning, landscape corridors can be designed to maximise the value of ecosystem services being delivered by ecological infrastructure in urban environments, by enhancing the connectivity of structural landscape elements,[25] as well as pointing to the importance of investing in the restoration and rehabilitation of ecological infrastructure including rivers, lakes, and woodlands in urban environments to provide ecological, social, and economic benefits.[26]

Soils and managed landscapes

Soils provide a host of ecosystem services, not least as productive land for agriculture, although it has been noted that a vast range of other ecosystem services that soil provides, as well as the importance of soil microbial communities, are generally overlooked when it comes to service provision, and are also much more difficult to quantify.[27] Some of these other services include decreasing the effects of floods, nutrient filtration, water cycling, and the treatment of both solid and liquid waste, as well as so-called 'supporting services' for above-ground ecosystems based on soil fertility.[27][28][29]

In terms of managed landscapes, Dominati (2013) states that research focusing on agro-systems based on the properties of soil usually involves a few main ecosystems services, including the provision of food, wood, and fibre; the filtration of nutrients and contaminants; pollination; carbon storage and the regulation of greenhouse gases; and cultural services like recreation.[27]

Source water bodies and wetlands

Natural source water bodies and other types of aquatic ecological infrastructure support adequate water supply around the world.[30][31] Dams and reservoirs that hold the majority of our source water are examples of human-made infrastructure integrated into a natural ecosystem, altering the natural processes of these ecosystems.[32][33] Lakes, ponds, rivers, and streams, meanwhile, are natural ecosystem elements that can be affected by the upstream discharge of residual nutrients in the effluent from wastewater treatment plants.[34] This creates a nutrient imbalance in downstream ecological infrastructure, which over time leads to nutrient overloads and eutrophication that significantly affect water quality and distorts the natural Water Cycle in these aquatic ecosystems.[34][35]

When it comes to water, there is growing awareness around the world of the benefits that can be provided by ecological infrastructure in being able to supplement, sustain, and sometimes substitute for built and engineered infrastructure.[4][5] For example, water management has been shown to benefit from the management of associated ecosystems,[5] such as the focus by administrators of the Panama Canal on protecting nearby forests and restricting agriculture to environmentally manage the entire watershed area surrounding the canal.[36]

There is increasingly a push towards nature-based water resource management solutions, and it has been posited that our built infrastructure and other anthropogenic factors often damage or destroy certain essential biophysical processes of the Water Cycle,[37][38][39] with the negative effects this can have on people, animals, and ecosystems outweighing the benefits they provide.[40]

Another concept gaining recognition is the idea that Nature-based solutions can be integrated with existing built infrastructure to remediate natural water bodies and maintain water quality throughout the Water Cycle, rather than only within the bounds of water treatment facilities and utilities.[5][41][42][43] These Nature-based solutions can be enabled by biotechnology, such as bio-dredging - encompassing the enzymatic digestion of organic sediment at the bottom of eutrophic lakes, as well as remediation of sediment contaminated with organic pollutants.[44] This process has also been studied in relation to the potential production of biogas.[45] Many source water bodies around the world are under increasing pressure from seasonal Harmful Algae Blooms (HABs) of toxin-producing cyanobacteria[35][46][47] that result in a wide variety of negative socio-economic and ecological impacts, including degraded water not fit for dinking, damaged fisheries, loss of tourism revenue, real estate value decreases, constrained agriculture, decreased resilience of the aquatic food web, and has significant implications for the health of human populations.[46]

Built infrastructure like wastewater treatment plants contribute to seasonal HABs by discharging residual nutrients into downstream water bodies,[48] with these nutrients accumulating in sediment nutrient stockpiles.[49] These stockpiles entrench eutrophic conditions that favour cyanobacteria, in a positive feedback loop that is exacerbated by conventional HAB treatments like the application of herbicides and algaecides.[50][51] Nutrient overloads have been shown to create imbalances in aquatic food webs in aquatic and freshwater environments,[52][38] causing a loss of ecosystem function and a shift to a eutrophic state.

Biotechnology aims to redress imbalances in aquatic ecosystems to support the return of a healthy aquatic food web, and the self-regulatory processes that naturally occur in aquatic ecosystems. In this way, eutrophic source water bodies can be returned to their natural state and thus converted into ecological infrastructure assets able to provide renewable water, helping to avert water shortages caused by cyanobacteria HABs, as well as alleviating pressure on water supply in the face of increasingly severe droughts and climate change.

Biotechnology also provides an opportunity in areas lacking effective built wastewater treatment infrastructure, particularly in the developing world; in sub-Saharan Africa, only 30% of wastewater is treated in built infrastructure, with the rest ending up in groundwater or source water bodies, degrading these associated aspects of ecological infrastructure and fuelling eutrophication.[53]

Research also highlights the importance of engaging various stakeholders to consolidate benefits for all. In South Africa, for example, an assessment of the conflict between water-related services and agricultural activities in degraded and pristine areas of three palmiet wetlands found that there were distinct possibilities for integrating these areas into a Payments for Ecosystem Services (PES) scheme, due to the number of ecosystem services the wetlands provide and the fact that they lie above municipal dams pivotal in the supply of water to surrounding communities. The study recommended that urban decision-makers collaborate with private farmers to maximise the ecosystem services being provided by the wetlands.[54]

South Africa also seems to be moving ahead with attempts to integrate ecological infrastructure into the country's national agenda, following the 2018 launch of the Ecological Infrastructure for Water Security (EI4WS) project in Johannesburg, financed by the Global Environment Facility (GEF) and a number of South African partners, and driven by the South African National Biodiversity Institute (SANBI).[6]

References

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