Wildlife Action Plan 2015 Revision Process White Paper
(e) Decline of 30%–50%
(f) Decline of 10%–30%
(g) Relatively Stable (≤10% increase or decrease)
(h) Increasing (≥10% increase)
8. Population Concentration. Some species tend to concentrate or aggregate at one or a few locations, especially during breeding seasons or migratory periods. Tese species may be at greater risk of extinction due to factors or events that can impact an entire population (Millsap et al. 1990) . Tis is most recently evident from the extensive loss of bat populations afected by white-nosed syndrome. A species may congregate or aggregate seasonally or daily at specifc locations in North Carolina (e.g., hibernacula, breeding sites, migration focal points, communal roosting, etc.) or may use the habitat year-round. Aquatic species concentrations may be based on occurrence within a single watershed or because the spe- cies tends to congregate during spawning. Populations that are so rare they are restricted to small areas can be considered aggregations. Migratory waterfowl that use Coastal Plain communities for stop-over or wintering habitat and amphibians that breed in isolated pools are examples of populations with life histories that require they concentrate in specifc areas. Wood Storks that breed in a few locations and have eggs or young on the nest could be at considerable risk from catastrophic events such as storms or fre. Te reproductive success of a Gopher Frog population breeding in one location would be at risk if drought caused the pond or wetland to dry up before young matured. Another example would be the Bog Turtle, which uses discrete wetlands that are often small concentrated patches within a larger landscape.
Is the species known or suspected to concentrate (or aggregate) in North Carolina?
(a) Majority concentrates at single location or stream reach in North Carolina
(b) Majority concentrates at 2–10 terrestrial locations or stream reaches in North Carolina
(c) Majority concentrates at 11–25 terrestrial locations or stream reaches in North Carolina
(d) Majority concentrates at >25 terrestrial locations or stream reaches in North Carolina
(e) Te species does not congregate or aggregate in North Carolina
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2015 NC Wildlife Action Plan
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