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Delaware, OH Home  Project Home  Biotrends Main  Biotrends Biodiversity Presentation
Last updated: January 23, 2002Contact: Anantha Prasad
Biodiversity/Threatened and Endangered Species/Species Abundance:
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Assessments of species richness and abundance show a number of trends as well.

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The number of tree species per 20 x 20 km cell is shown here, according to forest inventory data of the USDA Forest Service.

Prasad, A.M. and L.R. Iverson. 1999. A Climate Change Atlas for 80 Forest Tree Species of the Eastern United States [database].
www.fs.fed.us/ne/delaware/atlas
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A number of native species have been either extirpated from the state, or are considered extinct.

This table shows those estimates for plants - 4.7% of native species in OH and 5.6% in ME have been lost.

Turner MG, Carpenter SR, Gustafson EJ, Naiman RJ, Pearson SM. 1998. Land Use. Pages 37-61 in Mac MJ, Opler PA, Puckett Haecker CE, Doran PD. Status and trends of the nation's biological resources. U.S. Department of the Interior, U.S. Geological Survey, Reston, Va.
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The same information for mammals, birds, and fish are shown here.

Up to 20% of mammals, 17% of birds, and 15% of fish are considered extinct or extirpated from various states in the Midwest.

Turner MG, Carpenter SR, Gustafson EJ, Naiman RJ, Pearson SM. 1998. Land Use. Pages 37-61 in Mac MJ, Opler PA, Puckett Haecker CE, Doran PD. Status and trends of the nation's biological resources. U.S. Department of the Interior, U.S. Geological Survey, Reston, Va.
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Many believe we are in the midst of another mass extinction - the last was 65 million years ago when the dinosaurs died out.

Up to 20% of vertebrates species could be lost this century.

The larger animals are most vulnerable (either higher on food chain or requiring large habitats).

http://www.fs.fed.us/pl/rpa

USDA Forest Service. 2001. 2000 RPA assessment of forest and range lands. FS-687. USDA Forest Service. Washington, D.C. 78 pp.

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There are 452 endangered and 179 threatened species in the contiguous U.S.

Of these, at least half are associated with aquatic or riparian habitats.

Herrmann R, Stottlemyer R, Scherbarth L. 1998. Water Use. Pages 63-87 in Mac MJ, Opler PA, Puckett Haecker CE, Doran PD. Status and trends of the nation's biological resources. U.S. Department of the Interior, U.S. Geological Survey, Reston, Va.
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The density distribution of T&E animals is shown here.

Highest concentrations tend to be near coasts and Mississippi River valley.

http://www.fs.fed.us/pl/rpa

Hof, J., C. Flather, T. Baltic, and S. Davies. 1999. National projections of forest and rangeland condition indicators a supporting technical document for the1999 RPA assessment. Gen. Tech. Rep. PNW-GTR-442. U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. Portland, OR. 57 pp.

USDA Forest Service. 2001. 2000 RPA assessment of forest and range lands. FS-687. USDA Forest Service. Washington, D.C. 78 pp.
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The same map for T&E plants. Highest concentrations along coasts, in southeastern U.S., and nothern Arizona and Utah.

http://www.fs.fed.us/pl/rpa

Hof, J., C. Flather, T. Baltic, and S. Davies. 1999. National projections of forest and rangeland condition indicators a supporting technical document for the1999 RPA assessment. Gen. Tech. Rep. PNW-GTR-442. U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. Portland, OR. 57 pp.

USDA Forest Service. 2001. 2000 RPA assessment of forest and range lands. FS-687. USDA Forest Service. Washington, D.C. 78 pp.
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Some overall trends in wildlife include big increases in turkey, proghorn, deer, and Canada goose.

Decreases in rangeland species like northern bobwhite, hare, and western quail.

http://www.fs.fed.us/pl/rpa

USDA Forest Service. 2001. 2000 RPA assessment of forest and range lands. FS-687. USDA Forest Service. Washington, D.C. 78 pp.
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The trends in Ohio deer show that the population has increased nearly exponentially from near zero in the 1940s.

Iverson AL, Iverson LR. 1999. Spatial and temporal trends of deer harvest and deer-vehicle accidents in Ohio. The Ohio Journal of Science 99(4):84-94.
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hen analyzed using county data, the deer harvest was positively related to amount of forest in that county, and negatively related to amount of crop land.

Road-vehicle accidents were related to urban land and road lengths in the county.

Iverson AL, Iverson LR. 1999. Spatial and temporal trends of deer harvest and deer-vehicle accidents in Ohio. The Ohio Journal of Science 99(4):84-94.
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The temporal trend in deer harvest (1985-1995) and roadkill (1988-1995) is steeply up for Delaware County, and the pattern is typical for many Ohio counties.

If this trend continues, it would be better not to drive at dusk in October and November, because you have a very high chance of a deer collision!

Iverson AL, Iverson LR. 1999. Spatial and temporal trends of deer harvest and deer-vehicle accidents in Ohio. The Ohio Journal of Science 99(4):84-94.
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The next several slides are downloaded from the Breeding Bird Survey web site, showing the 30-year trends in bird abundances across the country (and into southern Canada).

If the map is blue, the populations are increasing at least 1.5% per year over the 30 years; if red, a decrease of at least 1.5% per year.

Canada goose populations are way up.

http://www.mbr.nbs.gov/bbs/htm96/trn626/all.html

Sauer, J.R., J.E. Hines, and J. Fallon. 2001. The North American breeding bird survey, results and analysis 1966-2000. Version 2001.2 USGS Patuxent Wildlife Research Center. Laurel, MD.
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Wild turkeys are up.

http://www.mbr.nbs.gov/bbs/htm96/trn626/all.html

Sauer, J.R., J.E. Hines, and J. Fallon. 2001. The North American breeding bird survey, results and analysis 1966-2000. Version 2001.2 USGS Patuxent Wildlife Research Center. Laurel, MD.
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Pileated woodpeckers are up in the north, a mix south.

http://www.mbr.nbs.gov/bbs/htm96/trn626/all.html

Sauer, J.R., J.E. Hines, and J. Fallon. 2001. The North American breeding bird survey, results and analysis 1966-2000. Version 2001.2 USGS Patuxent Wildlife Research Center. Laurel, MD.
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House finches are up in the East. It was introduced from the West to the East in 1940, and is now meeting the native populations in the center.

http://www.mbr.nbs.gov/bbs/htm96/trn626/all.html

Sauer, J.R., J.E. Hines, and J. Fallon. 2001. The North American breeding bird survey, results and analysis 1966-2000. Version 2001.2 USGS Patuxent Wildlife Research Center. Laurel, MD.
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Some good news: the house sparrow is down in the East, maybe because the house finch is up?

http://www.mbr.nbs.gov/bbs/htm96/trn626/all.html

Sauer, J.R., J.E. Hines, and J. Fallon. 2001. The North American breeding bird survey, results and analysis 1966-2000. Version 2001.2 USGS Patuxent Wildlife Research Center. Laurel, MD.
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Northern bobwhite is mostly down.

http://www.mbr.nbs.gov/bbs/htm96/trn626/all.html

Sauer, J.R., J.E. Hines, and J. Fallon. 2001. The North American breeding bird survey, results and analysis 1966-2000. Version 2001.2 USGS Patuxent Wildlife Research Center. Laurel, MD.
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Loggerhead shrike is mostly down.

http://www.mbr.nbs.gov/bbs/htm96/trn626/all.html

Sauer, J.R., J.E. Hines, and J. Fallon. 2001. The North American breeding bird survey, results and analysis 1966-2000. Version 2001.2 USGS Patuxent Wildlife Research Center. Laurel, MD.
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Killdeer is a mix nationally, but mostly up in the Midwest.

http://www.mbr.nbs.gov/bbs/htm96/trn626/all.html

Sauer, J.R., J.E. Hines, and J. Fallon. 2001. The North American breeding bird survey, results and analysis 1966-2000. Version 2001.2 USGS Patuxent Wildlife Research Center. Laurel, MD.
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For brown-headed cowbird, it is mostly down in the East, except for IL, IA and FL.

http://www.mbr.nbs.gov/bbs/htm96/trn626/all.html

Sauer, J.R., J.E. Hines, and J. Fallon. 2001. The North American breeding bird survey, results and analysis 1966-2000. Version 2001.2 USGS Patuxent Wildlife Research Center. Laurel, MD.
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With starling, it is a mix, but overall in the Midwest, slightly down.

http://www.mbr.nbs.gov/bbs/htm96/trn626/all.html

Sauer, J.R., J.E. Hines, and J. Fallon. 2001. The North American breeding bird survey, results and analysis 1966-2000. Version 2001.2 USGS Patuxent Wildlife Research Center. Laurel, MD.
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For pheasant, again a mix.

http://www.mbr.nbs.gov/bbs/htm96/trn626/all.html

Sauer, J.R., J.E. Hines, and J. Fallon. 2001. The North American breeding bird survey, results and analysis 1966-2000. Version 2001.2 USGS Patuxent Wildlife Research Center. Laurel, MD.