Naming and Mapping the Patterns
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- Naming and Mapping Natural Communities
- Naming and Mapping Ecological Systems
Naming and Mapping Natural Communities
The natural communities described by name on this website are among thousands in the U.S. National Vegetation Classification (USNVC).1 2 Ecologists nationwide and the federal government use the USNVC to classify (categorize) and map natural communities. It is a subset of the even larger International Vegetation Classification (IVC), which uses the EcoVeg approach.3 Each natural community is given an official name and a code for clear identification. Using this standard classification allows scientists to define and map natural communities across their entire range, and to communicate with each other about the health and extent of these communities.
Why Named After Plants, Not Animals?
Natural communities are named after plants because plants, unlike animals, are rooted in place and are usually easy to find and see. Many animals roam from one community to another, or if they live in a small area, they can be hard to find (snails and salamanders, for example). Furthermore, many animals avoid being seen by humans. For these reasons, it’s easier in most cases to define, describe, map, and recognize patterns in the landscape using plants (and geographic features) rather than animals.
Why So Many Names?
Every natural community has several names, each of which serves a different purpose. The scientific name is detailed, descriptive, and specific so as to avoid any confusion among the wide audience of ecologists and other scientists who might be using the name. But it’s long and it’s in Latin. For that reason, there’s an official common name, which is a little shorter and uses English. There’s an even shorter official code—a collection of letters and numbers that ecologists use on maps, reports, and believe it or not, sometimes in conversation. For this website, we’ve used nicknames that are abbreviated versions of the official common name. All of these names are listed at the bottom of each natural community page, in the Classification section.
Why Names Sometimes Change
Natural communities change over time, as does the scientific understanding of those communities. Sometimes important distinctions are discovered within a single natural community. When these distinctions are notable enough, two natural communities, rather than one, are then recognized. In such cases, a new name is added to the National Vegetation Classification.
In other cases, the opposite may be true: distinctions between two natural communities are discovered to be less important as more information is collected, and the two natural communities are lumped together under one name.
Either situation may impact future maps of a location.
Mapping Natural Communities
Ecologists map natural communities as a way of learning more about where each occurs, what its extent and range is, and how common or rare it is. (For an example of a map of natural communities, see the Rock Creek Park map.)
Usually, there’s not a sharp and obvious boundary between one natural community and another, even though the map makes it look like there is. The area of transition between two natural communities is called an ecotone, and it’s an area that may contain a combination of features from more than one natural community. Don't be surprised to find yourself in one of these transitional areas quite often as you hike up and down hills on a trail.
It's helpful to know the "classification and mapping rules." In general, we have defined and mapped natural communities that are naturally occurring in patches larger than about 1 acre. So as you walk a wooded trail, you might find a little forest seep that is obviously different from the forest around it, but is not classified or mapped because of its small size.
Naming and Mapping Ecological Systems
Ecological systems are groups of natural communities that occur in similar landscapes. Like natural communities, ecological systems have their own standardized classification system, called the International Terrestrial Ecological System Classification (or ITESC)4 (See 5 for the U.S. subset.) Each ecological system is given a unique official name and code. For this website, we’ve also used nicknames that are abbreviated or inverted versions of the official name. The names and code are listed at the bottom of each ecological system page.
Ecological systems can be mapped just like natural communities can. (For an example of a map of ecological systems, see this version of the Rock Creek Park map.)
- 1. , “U.S. National Vegetation Classification”. 2015.
- 2. , “Resources associated with the USNVC”, 2015. [Online]. Available: http://usnvc.org/resources/.
- 3. , “EcoVeg: A New Approach to Vegetation Description and Classification”, Ecological Monographs, vol. 84, no. 4, pp. 533-561, 2014.
- 4. , “NatureServe Explorer: An online encyclopedia of life”, 2014. [Online]. Available: http://www.natureserve.org/explorer.
- 5. , “Ecological systems of the United States: a working classification of U.S. terrestrial systems”, NatureServe, Arlington, VA, 2003.