Ecosystems/Ecoregions

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Ecosystem
View image Go to the article Experimental prairie fire at Indiana Dunes National Lakeshore.	View image Go to the article Twenty-eight thousand-year-old packrat midden at Capitol Reef National Park; orange notebook is 6 inches high.	View image Go to the article
View image Go to the article Many subalpine forests in western North America, such as this site in the Olympic Mountains, are currently protected in national parks and wilderness areas. Some of these areas have been experiencing increased tree growth and rapid establishment of young trees during the past century.	View image Go to the article Fig. 1. Drastically increased urbanization in Estes Park/Rocky Mountain National Park, 1921 (above) to 1986 (below). The photographs also show, however, forest recovery from turn-of-the-century logging and human-caused fires (Veblen and Lorenz 1991)..	View image Go to the article
View image Go to the article	View image Go to the article	View image Go to the article
View image Go to the article Principal causes of declining fish resources in the Southeast are due to habitat perturbations, such as loss of forested stream cover, mining activities, and impoundments, as at this site in northern Georgia.	View image Go to the article	View image Go to the article Florida Keys habitat showing representative reef fishes.
View image Go to the article Coring a small pond at Pictured Rocks National Lakeshore.	View image Go to the article	View image Go to the article Habitat loss on a stretch of the Mississippi River modified for navigation (shown here) contrasts with a diverse complex of habitats on less developed areas of the Upper Mississippi River (see plate previous page).
View image Go to the article	View image Go to the article Hudson River.	View image Go to the article Fig. 2. Extensive use of resources in the Florida Keys: Looe Key (spur and groove zone).
View image Go to the article	View image Go to the article Fig. 1. A cottonwood-willow riparian ecosystem illustrating how trees are closely associated with a water source in an arid landscape. Arikaree River, Colorado.	View image Go to the article Constrained reach of the Missouri River, Montana.
View image Go to the article Meandering reach of the Missouri River, Montana.	View image Go to the article Rio Grande floodplain.	View image Go to the article
View image Go to the article	View image Go to the article	View image Go to the article Colorado River study site with willow (note stress-induced canopy die back) and exotic tamarisk.
View image Go to the article Fig. 2. Southwestern willow flycatcher breeding territory in tamarisk habitat along the Colorado River in the Grand Canyon.	View image Go to the article Small unnamed bay near Bete Grise, Lake Superior, August 1991. Scattered lilies (Nuphar variegata) with submersed plants adjacent to a floating bog mat.	View image Go to the article Figure. Schematic cross-sections depicting the structural habitat provided by plant communities characteristic of regulated Lakes Superior and Ontario. Elevations at which vegetation sampling was conducted are shown beneath each cross-section (benchmark: International Great Lakes Datum 1955).

Ecosystem

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Experimental prairie fire at Indiana Dunes National Lakeshore.

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Twenty-eight thousand-year-old packrat midden at Capitol Reef National Park; orange notebook is 6 inches high.

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Many subalpine forests in western North America, such as this site in the Olympic Mountains, are currently protected in national parks and wilderness areas. Some of these areas have been experiencing increased tree growth and rapid establishment of young trees during the past century.

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Fig. 1. Drastically increased urbanization in Estes Park/Rocky Mountain National Park, 1921 (above) to 1986 (below). The photographs also show, however, forest recovery from turn-of-the-century logging and human-caused fires (Veblen and Lorenz 1991)..

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Principal causes of declining fish resources in the Southeast are due to habitat perturbations, such as loss of forested stream cover, mining activities, and impoundments, as at this site in northern Georgia.

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Florida Keys habitat showing representative reef fishes.

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Coring a small pond at Pictured Rocks National Lakeshore.

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Habitat loss on a stretch of the Mississippi River modified for navigation (shown here) contrasts with a diverse complex of habitats on less developed areas of the Upper Mississippi River (see plate previous page).

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Hudson River.

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Fig. 2. Extensive use of resources in the Florida Keys: Looe Key (spur and groove zone).

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Fig. 1. A cottonwood-willow riparian ecosystem illustrating how trees are closely associated with a water source in an arid landscape. Arikaree River, Colorado.

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Constrained reach of the Missouri River, Montana.

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Meandering reach of the Missouri River, Montana.

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Rio Grande floodplain.

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Colorado River study site with willow (note stress-induced canopy die back) and exotic tamarisk.

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Fig. 2. Southwestern willow flycatcher breeding territory in tamarisk habitat along the Colorado River in the Grand Canyon.

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Small unnamed bay near Bete Grise, Lake Superior, August 1991. Scattered lilies (Nuphar variegata) with submersed plants adjacent to a floating bog mat.

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Figure. Schematic cross-sections depicting the structural habitat provided by plant communities characteristic of regulated Lakes Superior and Ontario. Elevations at which vegetation sampling was conducted are shown beneath each cross-section (benchmark: International Great Lakes Datum 1955).