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Landscape pattern and census area as determinants of the diversity of farmland avifauna in Estonia

机译：景观格局和人口普查区域决定爱沙尼亚农田鸟类的多样性

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摘要

Landscape structure affects farmland bird species richness and diversity at different scales. We develop a predictive, metric-based model for farmland bird species richness in different bird guilds and study how the research area size influences the relationship between bird diversity and landscape metrics. Thirty research locations (randomly selected, each containing four counting points) were located in three counties of Estonia. In early summer 2002 and 2004, two bird counts per point were carried out in each research location. Three landscape metrics (patch density, edge density and Shannon's diversity index) were calculated at three spatial scales: 100- and 200-m buffer zones around the count points and in a 1 km~2 at 1 m × 1 m grain size. Using generalized additive mixed models with repeated measures, we found in most cases that the proportion of variance explained between the bird variables and landscape metrics increased with an increased study area thus demonstrating the effect of scale. Thus, a larger research area is recommended for landscape metrics. At large scales, however, all used landscape metrics were equally good predictors for bird species richness.
机译：景观结构在不同程度上影响农田鸟类物种的丰富性和多样性。我们为不同鸟类行会的农田鸟类物种丰富度建立了一种基于预测性模型的模型，并研究了研究面积大小如何影响鸟类多样性与景观度量之间的关系。爱沙尼亚的三个县有30个研究地点（随机选择，每个地方包含四个计数点）。在2002和2004初夏，每个研究地点每点进行了两次鸟类计数。在三个空间尺度上计算了三个景观度量（斑块密度，边缘密度和香农多样性指数）：计数点周围的100-m和200-m缓冲区以及1m×1m的晶粒大小在1 km〜2中。使用带有重复测量的广义加性混合模型，我们发现在大多数情况下，随着研究面积的增加，鸟类变量和景观度量之间解释的方差比例会增加，从而证明了规模效应。因此，建议将更大的研究领域用于景观度量。但是，在大范围内，所有使用的景观指标都是鸟类物种丰富度的良好预测指标。

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  • 来源
    《Regional Environmental Change》 |2013年第5期|1013-1020|共8页
  • 作者

    Riho Marja; Evelyn Uuemaa; UElo Mander; Jaanus Elts; Jaak Truu;

  • 作者单位

    Department of Geography, Institute of Ecology and Earth Sciences, University of Tartu, 46 Vanemuise St., 51014 Tartu, Estonia;

    Department of Geography, Institute of Ecology and Earth Sciences, University of Tartu, 46 Vanemuise St., 51014 Tartu, Estonia;

    Department of Geography, Institute of Ecology and Earth Sciences, University of Tartu, 46 Vanemuise St., 51014 Tartu, Estonia;

    Department of Geography, Institute of Ecology and Earth Sciences, University of Tartu, 46 Vanemuise St., 51014 Tartu, Estonia;

    Department of Geography, Institute of Ecology and Earth Sciences, University of Tartu, 46 Vanemuise St., 51014 Tartu, Estonia;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Biodiversity; Farmland birds; FRAGSTATS; Generalized additive mixed models; Landscape metrics;

    机译：生物多样性;农田鸟类;FRAGSTATS;广义加性混合模型;景观指标;

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