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Oldest Dryas
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The Oldest Dryas is a biostratigraphic subdivision layer corresponding to a relatively abrupt climatic cooling event, or stadial, which occurred during the last glacial retreat. The time period to whi
Dryas octopetala is the indicator species for the period
Dryas octopetala is the indicator species for the period
The edge of the ice in Greenland
The edge of the ice in Greenland
Grassland (Inner Mongolia)
Grassland (Inner Mongolia)
Artemisia vulgaris
Artemisia vulgaris
Bioindicator
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A bioindicator is any species or group of species whose function, population, or status can reveal the qualitative status of the environment. The most common indicator species are animals. For example
Oldest Dryas
…BP. As with the Younger and Older Dryas events, the stratigraphic layer is marked by abundance of the pollen and other remains of Dryas octopetala, an indicator species that colonizes arctic-alpine regions. The termination of the Oldest Dryas is marked by an abrupt oxygen isotope excursion, which has been observed at…
Caddisfly (order Trichoptera), a macroinvertebrate used as an indicator of water quality.
Caddisfly (order Trichoptera), a macroinvertebrate used as an indicator of water quality.
The lichen Lobaria pulmonaria is sensitive to air pollution.
The lichen Lobaria pulmonaria is sensitive to air pollution.
Populations of American crows (Corvus brachyrhynchos) are especially susceptible to the West Nile Virus, and can be used as a bioindicator species for
Populations of American crows (Corvus brachyrhynchos) are especially susceptible to the West Nile Virus, and can be used as a bioindicator species for the disease's presence in an area.