Effects of cropland encroachment on prairie pothole wetlands: numbers, density, size, shape, and structural connectivity
Effects of cropland encroachment on prairie pothole wetlands: numbers, density, size, shape, and structural connectivity
复制标题
耕地侵占对草原坑洼湿地的影响:数量、密度、大小、形状和结构连通性
DOI:
10.1007/s10980-019-00806-x
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发表时间:
2019
影响因子:
5.2
通讯作者:
McIntyre, Nancy E.
中科院分区:
文献类型:
--
作者:
Johnston, Carol A.;McIntyre, Nancy E.
ContextAgricultural expansion is the greatest source of wetland loss in the Prairie Pothole Region (PPR) of North and South Dakota, a critical waterfowl production area in North America. It is unknown how wetland losses from grassland conversion may alter structural connectivity in the prairie pothole network, however.ObjectivesWe examined how agricultural expansion over the period 2001–2011 altered the number, size, shape, and structural connectivity of PPR wetlands. We hypothesized that the loss of wetlands or wetland area would decrease structural connectivity on the landscape.MethodsWe analyzed a published raster database that quantified 2001–2011 agricultural conversion of wetlands in the Dakotas. A suite of structural connectivity metrics was computed using theigraphR package.ResultsWetland area decreased by 25% within the study area, density decreased by 16%, and average size decreased from 2.41 to 2.16 ha with no increase in perimeter:area ratios, thus indicating changes more from the splitting of larger wetlands (accounting for 23% of area lost) and “nibbling” at patch area (38%) than from complete wetland elimination (39%). Despite loss of wetlands and wetland area to cropland, however, the network did not display constrained structural connectivity.ConclusionsStructural connectivity has not been significantly affected by wetland losses because of the large number of remaining wetlands, but wetlands will continue to be lost with ongoing grassland conversion and climate shifts. It is unknown where the tipping point of wetland losses lies in the PPR that will incur ecological costs.
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DOI:
--
发表时间:
2000
期刊:
Wetlands (Wilmington, N.C.)
影响因子:
--
作者:
D. Naugle;Rex R. Johnson;Michael E. Estey;K. F. Higgins
通讯作者:
K. F. Higgins
影响因子:
4.8
作者:
Millett, Bruce;Johnson, W. Carter;Guntenspergen, Glenn
通讯作者:
Guntenspergen, Glenn
DOI:
10.1890/14-0662.1
发表时间:
2014
期刊:
Ecological applications : a publication of the Ecological Society of America
影响因子:
--
作者:
K. V. Van Meter;N. Basu
通讯作者:
N. Basu
DOI:
--
发表时间:
1990
期刊:
影响因子:
--
作者:
J. K. Ringelman
通讯作者:
J. K. Ringelman
影响因子:
2.7
作者:
Collins, S. D.;Heintzman, L. J.;McIntyre, N. E.
通讯作者:
McIntyre, N. E.