Anthropogenic Biomes
Anthropogenic Biomes as a Region for Research in Evolutionary Design Ecology
Many systems of classification for regions ignore the integration of human influence and ecosystem form, process, and diversity. This situation was common when I was in school and we learned about different ecological regions that were described largely by vegetation type and the weather patterns. A definition of region that is based on many interactions between society and nature, including perspectives on global patterns of sustained direct human interaction with ecosystems, may be appropriate for weighing studies of human health, its interactions, and driving factors. Anthropogenic biome describes a recent and perhaps better system of regional classification than have previous definitions (Ellis and Ramankutty, 2008) which have tended towards pure forms of nature or the separation of nature and society.
Anthropogenic Biomes: Definition
Anthropogenic biomes are similar to ecological biomes: they describe patterns of vegetation, climate, and ecosystem processes. However, they also take into account the anthropogenic influences of land use and population density on ecosystem processes. Ellis and Ramankutty characterize anthropogenic biomes as heterogeneous landscape mosaics, combining a variety of different land uses and land covers. Some of this heterogeneity is driven by natural landscape variation, as well as human enhancement of natural landscape (e.g. intensive agriculture) and human created landscape (e.g. construction of settlements and transportation systems).
The Regional Classification System they developed is as Follows (Ellis and Ramankutty, 2008):
Dense Settlements: Urban, Dense Settlements
Villages: Rice Villages, Irrigated Villages, Cropped and Pastoral Villages, Rainfed Villages, Rainfed Mosaic Villages
Croplands: Irrigated Cropland, Residential Rainfed Mosaic, Populated Irrigated Cropland, Populated Rainfed Cropland, Remote Cropland
Rangelands: Rangelands, Populated Rangeland, Remote Rangeland
Forested: Populated Forests, Remote Forests
Wildlands: Wild Forest, Sparse Forest, Barren
Of Earth’s 6.4 billion human inhabitants:
40% live in dense settlements biomes (82% urban population),
40% live in village biomes (38% urban),
15% live in cropland biomes (7% urban), and
5% live in rangeland biomes (5% urban)
0.6% live in forested biomes.
Asia and Oceania have the most diversity in the distribution of these regions around the world.
Further refinement is possible (Alessa and Chapin, 2008) by resolving distributions of social values, dietary patterns, movement patterns, resource use and between local and regional scales, inter alia.
Why Anthropogenic Biomes Matter for Public Health and Other Forms of Research
Anthropogenic biomes are a more accurate description of broad ecological patterns than are systems that exclusively describe vegetation patterns based on variations in climate and geology. Likewise, anthropogenic biomes may be better at representing patterns of human interactions with the environment and describing the driving factors in health outcomes. There are multiple reasons for this that stem from the varied roles that ecosystem, climate, cultural, and social relationships enact in dialogue with each other.
Anthropogenic biomes differ substantially in terms of basic ecosystem processes (eg carbon emissions, reactive nitrogen) and ecosystem biodiversity. These factors in turn affect the relative availability of resources for that region, including and especially ecosystem services like clean air and water and nutrient availability for agriculture. Furthermore, they must necessarily feed back into human ways of knowing and interacting with the environment.
Anthropogenic biomes can be connected to global patterns of ecosystem processes, along with anticipated future increases in human influence on ecosystems and the associated health outcomes due to climate change-driven risk factors.
Genome by environment interactions may be particularly relevant at this scale of interaction. The region definition is appropriate to human movement patterns and thus exposure to sources of chronic and acute risk from disease and consumption patterns.
The land use type itself determines a wide variety of factors including interactions with other humans, livestock, dietary consumption, levels of hydration, energy intensity, and other factors.
Culture, ethnicity, and language are also important in response to land use and domestic patterns of consumption ranging from food use and taboos, communication of lifestyle and health options, provisioning of nutrition, water, and energy, availability, and the use of technology to process and maintain different lifestyle patterns.
In each of these regional definitions, the interactions between landscape and human activity affects affluence, access to health care, and political regulation which suggests that these are are other possible subdivisions since these regions correspond to human social, transport, technological, and social networks–especially in dense settlements versus villages and remote areas.
For these reasons, anthropogenic biomes may provide more of a mosaic-like image from which to base categorizations used by clinical and other studies of health compared to political and continental boundaries which conventionalize migration barriers and tribal relationships. Geographic and political definitions will slowly shift, leaving only historical genetic signatures. Furthermore, anthro biomes are not specific to any particular disease or health outcome. They may encompass suites of infection and disease patterning where behavior, exposure, risk, and land use are correlated. They may also be indicative of linked health outcomes at the physiological level where, for example, musculoskeletal disorders and endocrine system perturbations are bound by human-influenced ecosystem interactions. Or they may suggest psychological correlates, linking cognition and landscape to disease and health risks.
The main point to consider is that ecological relationships, including land use and human infrastructure development, script behavior and consumption in ways that drive health outcomes. Understanding human influenced ecosystem patterns helps us identify areas of positive feedback between health risks, land use, population density, and the construction of everyday life.
References
Alessa, L., & Chapin, F. S. (2008). Anthropogenic biomes: a key contribution to earth-system science. Trends in Ecology & Evolution, 23(10), 529–531.
Ellis, E. C., & Ramankutty, N. (2008). Putting people in the map: anthropogenic biomes of the world. Frontiers in Ecology and the Environment, 6(8), 439–447.
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