Wetland Bioassessment Glossary
Ambient Monitoring
Monitoring within natural systems (e.g.,
lakes, rivers, estuaries, wetlands) to determine existing conditions.
Assemblage
An association of interacting populations
of organisms in a wetland or other habitat. Examples of assemblages used
for biological assessments include: algae, amphibians, birds, fish, amphibians,
macroinvertebrates (insects, crayfish, clams, snails, etc.), and vascular
plants.
Attribute
A measurable component of a biological
system. (Karr, J.R., and E.W. Chu. 1997. Biological Monitoring and Assessment:
Using Multimetric Indexes Effectively. EPA 235-R97-001. University of
Washington, Seattle).
Biological Assessment (Bioassessment)
Using biomonitoring data of samples of
living organisms to evaluate the condition or health of a place (e.g.,
a stream, wetland, or woodlot).
Biological Criteria (Biocriteria)
Numerical values or narrative expressions
that describe the condition of aquatic, biological assemblages of reference
sites of a given aquatic life use designation. EPA Office of Science and
Technology's Health and Ecological Criteria Division's Biological
Criteria Fact Sheet provides more information on this topic.
Biological Integrity
"...the ability of an aquatic ecosystem
to support and maintain a balanced, adaptive community of organisms having
a species composition, diversity, and functional organization comparable
to that of natural habitats within a region." (Karr, J. R. and D. R. Dudley.
1981. Ecological perspective on water quality goals. Environmental Management
5:55-68). Key
Concepts for Using Watershed Biological Indicators provides more information
on this topic.
Biological Monitoring (Biomonitoring)
Sampling the biota of a place (e.g., a
stream, a woodlot, or a wetland).
Biota
The plants and animals living in a habitat.
Composition (Structure)
The composition of the taxonomic grouping
such as fish, algae, or macroinvertebrates relating primarily to the kinds
and number of organisms in the group.
Community
All the groups of organisms living together
in the same area, usually interacting or depending on each other for existence.
Criteria
Statements of the conditions presumed to
support or protect the designated use or uses of a waterbody. Criteria
may be narrative or numeric. The singular form is criterion.
Designated Use
Classification designated in water quality
standards for each waterbody or segment that defines the optimal purpose
for that waterbody. Examples are drinking water use and aquatic life use.
Diatom
Microscopic algae with cell walls made
of silicon and of two separating halves.
Diversity
A combination of the number of taxa (see
taxa richness) and the relative abundance of those taxa. A variety of
diversity indexes has been developed to calculate diversity.
Ecological Assessment
A detailed and comprehensive evaluation
of the status of a water resource system designed to detect degradation
and if possible, to identify causes of that degradation.
Ecological Integrity
The condition of an unimpaired ecosystem
as measured by combined chemical, physical (including physical habitat),
and biological attributes.
Ecoregion
A region defined by similarity of climate,
landform, soil, potential natural vegetation, hydrology, and other ecologically
relevant variables.
Functions
The roles that wetlands serve, which are
of value to society or environment.
Functional Groups
A means of dividing organisms into groups,
often based on their method of feeding (e.g., shredder, scraper, filterer,
predator), type of food (e.g., fruit, seeds, nectar, insects), or habits
(e.g., burrower, climber, clinger).
Habitat
The sum of the physical, chemical, and
biological environment occupied by individuals of a particular species,
population, or community.
Herpetiles
Reptiles and amphibians.
Hydrogeomorphic (HGM) Classification
A wetland classification system based on
the position of a wetland in the landscape (geomorphic setting), dominant
sources of water, and the flow and fluctuation of water once in the wetland.
Hydrogeomorphic classes include riverine, depressional, slope, mineral
soil flats, organic soil flats, estuarine fringe, and lacustrine fringe.
More information may be found on the multi-agency site, Hydrogeomorphic Approach
to Assessing Wetland Functions.
Hydrogeomorphic (HGM) Approach
A method that compares a wetland's functions
(e.g., water retention, nutrient cycling) to similar wetlands of the same
type (as defined by HGM classification) that are relatively unaltered.
HGM functions normally fall into one of three major categories: (1) hydrologic
(e.g., storage of surface water), (2) biogeochemical (e.g., removal of
elements and compounds), and (3) habitat (e.g., maintenance of plant and
animal communities). More information may be found on the multi-agency
site, Hydrogeomorphic Approach
to Assessing Wetland Functions.
Hydrology
The science of dealing with the properties,
distribution, and circulation of water both on the surface and under the
earth.
Impact
A change in the chemical, physical (including
habitat), or biological quality or condition of a waterbody caused by
external forces.
Impairment
A detrimental effect on the biological
integrity of a waterbody caused by an impact that prevents attainment
of the designated use.
Index of Biological Integrity
An integrative expression of site condition
across multiple metrics. An index of biological integrity is often composed
of at least seven metrics. (Karr, J.R., and E.W. Chu. 1997. Biological
Monitoring and Assessment: Using Multimetric Indexes Effectively. EPA
235-R97-001. University of Washington, Seattle.) The plural form is either
indices or indexes.
Index of Biological Integrity
An integrative expression of the biological
condition that is composed of multiple metrics. Similar to economic indexes
used for expressing the condition of the economy.
Macroinvertebrates
Animals without backbones that can be seen
with the naked eye (caught with a 1 mm2 mesh net). Includes
insects, crayfish, snails, mussels, clams, fairy shrimp, etc.
Metric
An attribute with empirical change in value
along a gradient of human influence. (Karr, J.R., and E.W. Chu. 1997.
Biological Monitoring and Assessment: Using Multimetric Indexes Effectively.
EPA 235-R97-001. University of Washington, Seattle)
Pollution
The Clean Water Act (Section 502.19) defines
pollution as "the [hu]man-made or [hu]man-induced alteration of chemical,
physical, biological, and radiological integrity of water."
Reference Condition
Set of selected measurements or conditions
of minimally impaired waterbodies characteristic of a waterbody type in
a region.
Reference Site
A minimally impaired site that is representative
of the expected ecological conditions and integrity of other sites of
the same type and region.
Taxa
A grouping of organisms given a formal
taxonomic name such as species, genus, family, etc. The singular form
is taxon.
Taxa Richness
The number of distinct species or taxa
that are found in an assemblage, community, or sample.
Water Quality Standard
A legally established state regulation
consisting of three parts: (1) designated uses, (2) criteria, and (3)
antidegradation policy. EPA's Office of Science and Technology's Water
Quality Criteria and Standards Program site provides more information.
Wetland
Those areas that are inundated or saturated
by surface or groundwater at a frequency and duration sufficient to support,
and that under normal circumstances do support, a prevalence of vegetation
typically adapted for life in saturated soil conditions. Wetlands generally
include swamps, marshes, bogs, and similar areas. (Cowardin et al. 1979.
Classification of Wetlands and Deepwater Habitats of the United States.
U.S. Department of the Interior. Fish and Wildlife Service. FWS/OBS-79/31)
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