Dissertation Research: Temporal Scale and the Consequences of Habitat Fragmentation: The Birds of Pine-Oak Forests in the Oaxaca Valley

论文研究：时间尺度和栖息地破碎化的后果：瓦哈卡山谷松橡树林中的鸟类

• 批准号: 9801587
• 负责人: Townsend Peterson
• 金额: $ 0.9万
• 依托单位: University of Kansas Center for Research Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-05-01 至 2000-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9801587&HistoricalAwards=false
• 关键词: Dissertation; Research; Temporal; Scale; Consequences

9801587 Peterson Spatial scale has been considered carefully in the study of fragmented ecosystems, but the effects of temporal scale have been largely overlooked. Most fragmentation studies focus on anthropogenically fragmented situations that were largely fragmented on a time scale of 101 - 102 yr. This is a time scale within which faunas are expected to still be in the dynamics of relaxation. Naturally fragmented systems, however, provide an opportunity to view older fragmentation schemes ( 103 - 104 yr), potentially allowing analysis of response patterns under equilibrium conditions. The Oaxaca Valley in southern Mexico represents a naturally fragmented ecosystem, ideal for the study of the long-term effects of habitat fragmentation. Twelve thousand years ago, humid pine-oak forest was the dominant vegetation type throughout the region. This forest type is now restricted to high elevations. In the proposed study, the resident bird communities in these relict patches will be inventoried, distribution patterns described and avifaunal variation related to patch characteristics. Distributional data will be compiled using existing historic specimen data, and inventories completed by field inventories. Fragments will be described based on direct field measurement, consultation of thematic maps, and data from remotely sensed imagery. Robust new statistical techniques, which we have tested in anthropogenically fragmented ecosystems, will be applied to understanding influences of temporal scale on effects of fragmentation on avifaunas. Additional analyses will focus on functional groups of taxa, such as feeding guilds, phylogenetic lineages, etc., to provide more detailed understanding of processes involved. Results will be applied to designing a reserve system for maximal preservation of the bird diversity of the ecosystem.

小行星9801587 空间尺度在破碎化生态系统的研究中得到了认真的考虑，但时间尺度的影响在很大程度上被忽视了。大多数碎片化研究的重点是在101 - 102年的时间尺度上，在很大程度上是支离破碎的情况下， 这是一个动物群预计仍处于放松动态的时间尺度。然而，自然破碎的系统提供了一个机会，查看旧的破碎方案（103 - 104年），可能允许平衡条件下的响应模式的分析。墨西哥南部的瓦哈卡山谷代表了一个自然破碎的生态系统，是研究栖息地破碎化长期影响的理想场所。12000年前，潮湿的松栎林是整个地区的主要植被类型。 这种森林类型现在仅限于高海拔地区。在拟议的研究中，这些残馀斑块的留鸟群落将被清查，分布格局的描述和鸟类区系的变化与斑块特征。分布数据将使用现有的历史标本数据和实地盘存完成的盘存汇编。将根据直接实地测量、查阅专题地图和遥感图像数据对碎片进行说明。强大的新的统计技术，我们已经测试了在adhergenically破碎的生态系统，将被应用于了解时间尺度上的影响，对鸟类破碎的影响。其他的分析将集中在分类群的功能群上，如摄食行会、系统发育谱系等，以提供对所涉及的过程的更详细的理解。研究结果将应用于设计一个保护区系统，最大限度地保护生态系统的鸟类多样性。