Prairie Pothole Region#Wildlife
{{Short description|Geographic area in North America}}
{{for|the lake in Stutsman County, North Dakota|Prairie Pothole (lake)}}
Image:PrairiePotholeRegionMap.gif
Image:Barringer-Arial.jpg in Iowa, a remnant of the extensive prairie wetlands that once covered the region.]]
The Prairie Pothole Region (PPR) is an expansive area of the northern Great Plains that contains thousands of shallow wetlands known as potholes. These potholes are the result of glacier activity in the Wisconsin glaciation, which ended about 10,000 years ago. The decaying ice sheet left behind depressions formed by the uneven deposition of till as buried ice blocks melted in ground moraines.{{cite web |last1=Johnson |first1=Rex R. |last2=Oslund |first2=Fred T. |last3=Hertel |first3=Dan R. |title=The past, present, and future of prairie potholes in the United States |url=https://www.researchgate.net/publication/240797999 |website=Researchgate |publisher=Journal of Soil and Water Conservation |access-date=8 December 2024}} These depressions are called potholes, glacial potholes, kettles, or kettle lakes. They fill with water in the spring, creating wetlands, which range in duration from temporary to semi-permanent.{{Cite journal |last1=Johnson |first1=W. Carter |last2=Millet |first2=Bruce V. |last3=Gilmanov |first3=Tagir |last4=Voldseth |first4=Richard A. |last5=Guntenspergen |first5=Glenn R. |last6=Naugle |first6=David E. |date=2005 |title=Vulnerability of Northern Prairie Wetlands to Climate Change |journal=BioScience |volume=55 |issue=10 |pages=863 |doi=10.1641/0006-3568(2005)055[0863:vonpwt]2.0.co;2 |issn=0006-3568 |doi-access=free}} The region covers an area of about 800,000 sq. km and expands across three Canadian provinces (Saskatchewan, Manitoba, and Alberta) and five U.S. states (Minnesota, Iowa, North and South Dakota, and Montana). The hydrology of the wetlands is variable, which results in long term productivity and biodiversity. The PPR is a prime spot during breeding and nesting season for millions of migrating waterfowl.{{Cite web |url=https://www.ducks.org/conservation/where-ducks-unlimited-works/prairie-pothole-region |title=Prairie Pothole Region |website=www.ducks.org |language=en-US |access-date=2019-11-13}}
Hydrology
Few natural surface water drainage systems occur in the region as pothole wetlands are not connected by surface streams. They receive most of their water from spring snowmelt and precipitation.{{Cite web |url=http://explorer.natureserve.org/servlet/NatureServe?searchSystemUid=ELEMENT_GLOBAL.2.722997 |title=Comprehensive Report Ecological System - Great Plains Prairie Pothole |website=explorer.natureserve.org |access-date=2019-12-02}} Some pothole wetlands also receive groundwater inflow, so they typically last longer each year than those that only receive water from precipitation. Shorter-duration wetlands fed only by precipitation typically are sources of groundwater recharge.{{cite book | last1=Euliss | first1=Ned H. Jr. |last2=Wrubleski |first2=Dale A. |last3=Muchet |first3=David M. |contribution=Wetlands of the Prairie Pothole Region: Invertebrate species composition, ecology, and management |date=1999 |publisher=John Wiley and Sons |pages=471–514 |editor-last1=Batzer |editor-first1=Darold P. |editor-last2=Rader |editor-first2=Russell B. |editor-last3=Wissinger |editor-first3=Scott A. |title=Invertebrates in freshwater wetlands of North America: Ecology and management |url=https://pubs.er.usgs.gov/publication/85406 |access-date=22 November 2019 |isbn=978-0-471-29258-6}} The hydrology of the potholes is very variable, responding to changes in precipitation and groundwater, and results in regular wet-and-dry cycles.{{Cite book |title=Wetlands |last1=Mitsch |first1=William |last2=Gosselink |first2=James |publisher=Wiley |year=2015 |isbn=978-1-118-67682-0 |edition=5th |location=Hoboken, New Jersey |pages=61–62}}
Vegetation
File:Prairie Pothole Landscape South Dakota - 53106527617.jpg
The vegetation of the PPR consists of emergent plants and tall grasses, while the prairie surrounding the region has dense grassland vegetation. The composition of a local plant community is heavily affected by the amount of water available. In wetter wetlands that retain water through the summer, the common plant is hard-stem bulrush, along with soft-stem bulrush and common threesquare in slightly drier regions of the wetlands. The vegetation in permanently flooded wetlands is more aquatic; duckweeds, pondweeds, aquatic buttercups, and aquatic smartweeds are some of the most common. In drier wetlands of the PPR, the vegetation varies from spikerush, which is found in the wetter areas of the wetland, to foxtail barley and wheatgrass on the outer edges of the wetland.{{Cite web |url=http://fieldguide.mt.gov/displayES_Detail.aspx?ES=9203 |title=Great Plains Prairie Pothole |website=Montana Field Guide |last=Montana Natural Heritage Program |language=en |access-date=19 October 2020}} The variable availability of water in the Prairie Pothole Region is buffered by an abundant seed bank under the soil, comprising species that thrive under different water regimes. During times of drought, shortgrass species increase and expand their range, while during wetter periods, tallgrass and mixed prairie communities become more common.{{Cite web |last1=Anderson |first1=Jim |last2=Samargo |first2=Emily |title=Wetland Types: Prairie Potholes |url=http://forestandrange.org/new_wetlands/potholes_4.htm |access-date=19 October 2020 |website=Wetlands Management |archive-url=https://web.archive.org/web/20121128111103/http://forestandrange.org/new_wetlands/potholes_4.htm |archive-date=28 November 2012}}
Wildlife
The Prairie Pothole Region provides important habitats for migratory waterfowl and other wildlife, supporting more than 50% of North America's migratory waterfowl.{{cite web |title=Regional Ecosystems: The Prairie Pothole Region |url=http://www.nbii.gov/portal/server.pt?open=512&objID=424&PageID=1410&cached=true&mode=2&userID=2 |publisher=National Biological Information Infrastructure |access-date=26 October 2020 |archive-url=https://web.archive.org/web/20111025014513/http://www.nbii.gov/portal/server.pt?open=512&objID=424&PageID=1410&cached=true&mode=2&userID=2 |archive-date=25 October 2011}} In particular, the region is one of North America's most important breeding areas for ducks. Although the region contains only about one-tenth of the continent's habitat area for breeding of waterfowl, roughly half the primary species of game ducks on the continent breed there. The region accounts for more than 60% of the breeding populations of mallard, gadwall, blue-winged teal, northern shoveler, northern pintail, redhead, and canvasback ducks.{{cite web |last1=Austin |first1=Jane E. |title=Waterfowl in the Prairie Pothole Region |url=http://www.npwrc.usgs.gov/resource/habitat/grlands/waterfwl.htm |website=Northern Prairie Wildlife Research Center |publisher=United States Geological Survey |date=3 August 2006 |access-date=26 October 2020 |archive-url=https://web.archive.org/web/20110629022929/http://www.npwrc.usgs.gov/resource/habitat/grlands/waterfwl.htm |archive-date=29 June 2011}}
Threats
Conversion of land for agriculture is a significant factor in the loss of wetlands in the PPR. More than half of the wetlands have been drained for farming. In particular, 90% of the prairie wetlands of the Minnesota River basin have been lost as habitat.{{cite web |url=http://mrbdc.mnsu.edu/mnbasin/fact_sheets/wetlands.html |title=Wetlands |date=15 April 2011 |work=Fact Sheets |publisher=Minnesota River Basin Data Center, Minnesota State University, Mankato |access-date=26 October 2020}} The wetlands that do persist, surrounded as they are by agricultural lands, are also affected. Chemical runoff, sedimentation, and nutrient flow into the wetlands have adverse impacts.{{Cite web |url=https://www.nwf.org/Home/Educational-Resources/Wildlife-Guide/Wild-Places/Prairie-Potholes |title=Prairie Potholes |website=National Wildlife Federation |language=en |access-date=26 October 2020}}
Climate change is an adverse factor in the long-term viability of PPR wetlands for breeding ducks and other birds. Without mitigation, severe droughts and rising temperatures will cause many pothole wetlands to dry up sooner in the spring. In turn, due to the timing of waterfowl migrations, these dried wetlands will not present suitable breeding habitat. Warming-related drought may affect as much as 90 percent of the PPR's remaining wetlands. Simulations suggest that climate change will shift the most productive wetlands from the center of the region (southeastern Saskatchewan and the Dakotas) to edges of the PPR in the east and north. However, research has suggested that the effect of global warming is overshadowed by that of intensified land use and drainage of wetlands.{{Cite journal |last1=Niemuth |first1=Neal D. |last2=Fleming |first2=Kathleen K. |last3=Reynolds |first3=Ronald E. |date=2014-06-17 |title=Waterfowl Conservation in the US Prairie Pothole Region: Confronting the Complexities of Climate Change |journal=PLOS ONE |language=en |volume=9 |issue=6 |pages=e100034 |bibcode=2014PLoSO...9j0034N |doi=10.1371/journal.pone.0100034 |issn=1932-6203 |pmc=4061047 |pmid=24937641 |doi-access=free}}
See also
References
External links
{{Portal|Wetlands}}
- {{cite web |url=https://www.fws.gov/refuges/smallWetlands/ |title=The Small Wetlands Program: A Half Century of Conserving Prairie Habitat |website=National Wildlife Refuge System |publisher=U.S. Fish & Wildlife Service |access-date=9 July 2018}}
- {{cite web |url=http://ppjv.org/ |title=Welcome to the Prairie Pothole Joint Venture |website=Prairie Pothole Joint Venture |access-date=9 July 2018}}
- {{cite web |url=https://www.epa.gov/wetlands/prairie-potholes |title=Prairie Potholes |date=2016-10-06 |work=Wetlands |publisher=United States Environmental Protection Agency |access-date=2018-07-09}}
- [https://www.youtube.com/watch?v=XQ9D1S8sm7w America’s Grasslands: A Threatened National Treasure] Documentary produced by Prairie Public Television
- [https://purl.fdlp.gov/GPO/gpo40416 Land-use Change, Economics, and Rural Well-being in the Prairie Pothole Region of the United States] United States Geological Survey
{{Regions of the United States}}
Category:Regions of North Dakota
Category:Ecoregions of South Dakota
Category:Ecozones and ecoregions of Alberta
Category:Ecozones and ecoregions of Manitoba
Category:Ecozones and ecoregions of Saskatchewan
Category:Wetlands of Minnesota
Category:Wetlands of South Dakota
Category:Wetlands of North Dakota
Category:Ecoregions of Minnesota