Collaborative Research: Climatic and Anthropogenic Forcing of Wetland Landscape Connectivity in the Great Plains

合作研究：大平原湿地景观连通性的气候和人为强迫

• 批准号: 1340583
• 负责人: Christopher Wright
• 金额: $ 97.44万
• 依托单位: South Dakota State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-06-01 至 2015-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1340583&HistoricalAwards=false
• 关键词: Collaborative; Research; Climatic; Anthropogenic; Forcing

The presence and persistence of animals in a landscape is a function of the availability of suitable habitat and the ability of individual animals to find this habitat. Thus, in any landscape, animals encounter an arrangement of suitable habitat patches, or stepping-stones, located within a matrix of unsuitable habitat. The spatial arrangement of these stepping-stones is known as a "habitat network." Losses of these stepping-stones stemming from human development and climate change can alter these habitat networks, affecting persistence of the species in the face of rapid climate and landuse change. Wetland habitats in the U.S. Great Plains are embedded within a mixed grassland and agricultural landscape. The Great Plains experiences dramatic year-to-year variability in weather. Climate drives surface processes such as the hydrologic cycle, and hydrology is the most important factor controlling the quality of wetland habitats and the presence of wetland habitat networks. Thus the spatial arrangement of wetland habitat networks in the Great Plains is constantly changing; some wetlands (stepping stones) disappear as others reappear. Land use change adds an additional level of complexity. Increasingly, farmers are converting remnant grasslands in the Great Plains to row crops, with most of this conversion occurring in close proximity to wetlands. This loss of grassland habitat interferes with the ability of some organisms to move between neighboring wetlands, while other species tend to avoid wetlands not surrounded by sufficient grassland cover. This award will use the highly dynamic wetland landscapes in the Great Plains as model systems for exploring general principles related to habitat connectivity. In particular, the funds will allow the PIs to examine how both climate change and land use change will likely influence the connectivity of wetland habitat networks into the next century. This study will focus on two groups, water birds and amphibians, as model organisms that vary widely in their abilities to disperse between wetlands. Methods for quantifying habitat connectivity will be adapted from the study of social networks and a branch of mathematics known as graph theory. Temporal series of wetland condition and land use trends from satellite imagery, computer simulations of wetland hydrology, and downscaled climate change projections will be used to: 1) examine the effects of land use change and climate change on the ability of these two groups of animals to disperse between wetlands, 2) identify barriers to these movements, and 3) identify those wetland habitat networks most likely to persist under projected changeFindings from this study will be used in support of regional conservation planning. Results will be disseminated to public-private partnerships like the U.S. Department of Interior's network of Landscape Conservation Cooperatives and the Prairie Pothole, Rainwater Basin, and Playa Lakes Joint Ventures led by the U.S. Fish and Wildlife Service, and to state management agencies and nongovernmental organizations like Ducks Unlimited and The Nature Conservancy in support of their wetland and grassland easement purchasing strategies. This project will support the early- to mid-career development of four co-PIs, all of whom are from under-represented groups. Through support of external training and lab exchanges, a cadre of four Postdoctoral Fellows and one Ph.D. student will be trained in inter-disciplinary, collaborative research. This research will advance the field of Macrosystem Biology by leveraging support from other different disciplines, e.g., advanced hydrologic modeling, atmospheric science, and graph theory to address previously inaccessible biological questions. Methods developed over the course of this project, and general principles potentially discovered, are anticipated to be broadly applicable to conservation of other types of habitat networks, globally.

动物在景观中的存在和持久性取决于合适栖息地的可用性以及个体动物找到该栖息地的能力。因此，在任何景观中，动物都会遇到位于不合适栖息地矩阵内的合适栖息地斑块或踏脚石的排列。这些垫脚石的空间排列被称为“栖息地网络”。 人类发展和气候变化导致这些垫脚石的丧失可能会改变这些栖息地网络，从而影响物种在气候和土地利用快速变化时的持久性。美国大平原的湿地栖息地镶嵌在草原和农业景观的混合景观中。大平原的天气每年都经历着巨大的变化。气候驱动着水文循环等地表过程，而水文是控制湿地栖息地质量和湿地栖息地网络存在的最重要因素。因此，大平原湿地栖息地网络的空间布局是不断变化的；一些湿地（踏脚石）消失，而另一些则重新出现。土地利用变化增加了额外的复杂性。越来越多的农民将大平原的剩余草地改造成中耕作物，其中大部分发生在湿地附近。草原栖息地的丧失会干扰某些生物在邻近湿地之间移动的能力，而其他物种则倾向于避开没有足够草原覆盖的湿地。该奖项将使用大平原高度动态的湿地景观作为模型系统，探索与栖息地连通性相关的一般原则。特别是，这些资金将允许项目负责人研究气候变化和土地利用变化将如何影响下个世纪湿地栖息地网络的连通性。这项研究将重点关注水鸟和两栖动物这两个群体，它们作为模式生物，在湿地之间的分散能力差异很大。量化栖息地连通性的方法将改编自社交网络和图论数学分支的研究。来自卫星图像、湿地水文计算机模拟和缩小规模的气候变化预测的湿地状况和土地利用趋势的时间序列将用于：1）检查土地利用变化和气候变化对这两组动物的能力的影响分散在湿地之间，2）确定这些移动的障碍，3）确定那些最有可能在预计变化下持续存在的湿地栖息地网络本研究的结果将用于支持区域保护规划。结果将分发给公私合作伙伴关系，例如美国内政部的景观保护合作社网络以及由美国鱼类和野生动物管理局领导的草原坑洼、雨水盆地和普拉亚湖合资企业，以及国家管理机构和非政府组织例如 Ducks Unlimited 和大自然保护协会，支持他们的湿地和草地地役权购买策略。该项目将支持四名联合 PI 的早期到中期职业发展，他们都来自代表性不足的群体。通过外部培训和实验室交流的支持，一支由四名博士后研究员和一名博士组成的骨干队伍。学生将接受跨学科合作研究的培训。这项研究将通过利用其他不同学科的支持（例如先进的水文模型、大气科学和图论）来解决以前无法解决的生物学问题，从而推动宏观系统生物学领域的发展。在该项目过程中开发的方法以及可能发现的一般原则预计将广泛适用于全球其他类型栖息地网络的保护。