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首页> 外文期刊>Wetlands >SPATIOTEMPORAL PATTERNS OF WETLAND OCCURRENCE IN THE PRAIRIE POTHOLE REGION OF EASTERN SOUTH DAKOTA
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SPATIOTEMPORAL PATTERNS OF WETLAND OCCURRENCE IN THE PRAIRIE POTHOLE REGION OF EASTERN SOUTH DAKOTA

机译:东达科他州南部大草原坡口地区湿地发生的时空格局

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摘要

We evaluated changes in wetland abundance, size, and classification between average (1979-1986) and above-average (1995-1999) precipitation periods for two physiographic regions in eastern South Dakota. Temporal shifts in wetland numbers, area, and class varied by topographic location. In high wetland density areas (> 8 wetlands/100 ha), our data suggests that larger, semipermanent wetlands expanded and absorbed nearby wetland basins into their margins, resulting in a net "loss" or disappearance of temporary and seasonal wetlands in above-average water condition years. "Losses" described here are not deemed permanent as in cases of draining or filling, and wetlands may re-form when water conditions return to normal. Nevertheless, temporary disappearance of smaller more isolated wetlands may have implications for breeding waterfowl and other fauna. Percent change of semipermanent basin numbers was positively correlated with wetland density, whereas the opposite was true for seasonal wetlands. Loss of temporary wetlands was correlated with wetland aggregation within the sample area. However, in low wetland density areas, the number and size of seasonal and temporary wetlands generally increased following above-average precipitation. We suggest that wetlands' spatial arrangement be considered along with traditional wetland quantification techniques to better account for shifts in wetland habitat in dry versus wet years.
机译:我们评估了南达科他州东部两个地理区域的平均(1979-1986年)和高于平均水平(1995-1999年)降水期之间的湿地丰度,大小和分类的变化。湿地数量,面积和类别的时间变化因地形位置而异。在高湿地密度地区(> 8个湿地/ 100公顷),我们的数据表明,较大的半永久性湿地扩展并吸收了附近的湿地盆地并进入其边缘,导致临时和季节性湿地的净“损失”或消失,高于平均水平水状况年。此处描述的“损失”不像排泄或填充一样被认为是永久性的,并且当水状况恢复正常时,湿地可能会重新形成。然而,更小,更孤立的湿地的暂时消失可能对水禽和其他动物的繁殖有影响。半永久性流域数的百分比变化与湿地密度呈正相关,而季节性湿地则相反。临时湿地的损失与样本区域内湿地的聚集有关。但是,在湿地密度低的地区,季节性和临时湿地的数量和大小通常在高于平均水平的降雨之后增加。我们建议将湿地的空间布局与传统的湿地量化技术一起考虑,以更好地说明干旱年份和湿润年份湿地栖息地的变化。

著录项

  • 来源
    《Wetlands》 |2009年第2期|678-689|共12页
  • 作者单位

    Wildlife and Fisheries Department, South Dakota State University, Brookings, South Dakota, USA 57007 Present address: California Coop Fish Research Unit, Humboldt State University, Arcata, California, USA 95521;

    U. S. Fish and Wildlife Service, Leopold Wetland Management District, Portage, Wisconsin, USA 53901;

    U. S. Geological Survey, South Dakota Cooperative Fish and Wildlife Research Unit South Dakota State University, Brookings, South Dakota, USA 57007;

    U. S. Geological Survey, South Dakota Cooperative Fish and Wildlife Research Unit South Dakota State University, Brookings, South Dakota, USA 57007;

    U. S. Fish and Wildlife Service, Fergus Falls, Minnesota, USA 56537;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    classification; hydrology; landscape scale; missouri coteau; prairie coteau;

    机译:分类;水文学景观规模密苏里州大草原;

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