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首页> 外文会议>International Conference on Computational Science and Its Applications(ICCSA 2004) pt.2; 20040514-20040517; Assisi; IT >Computing Foraging Paths for Shore-Birds Using Fractal Dimensions and Pecking Success from Footprint Surveys on Mudflats: An Application for Red-Necked Stints in the Moroshechnaya River Estuary, Kamchatka-Russian Far East
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Computing Foraging Paths for Shore-Birds Using Fractal Dimensions and Pecking Success from Footprint Surveys on Mudflats: An Application for Red-Necked Stints in the Moroshechnaya River Estuary, Kamchatka-Russian Far East

机译：利用分形维数计算海岸鸟类的觅食路径并从泥滩足迹调查中获得成功：堪察加半岛俄罗斯远东莫罗什希纳亚河河口红颈鳍的应用

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摘要

Foraging strategies for Red-necked Stints (Calidris ruficollis) at migration staging sites are virtually unknown, nor exist any methods to achieve such crucial knowledge. Here, for the first time a non-invasive and quantitative computing method of foraging paths is presented from a study carried out during fall migration 1999 for fine-sediment mudflats of the Moroshechnaya River Estuary (56° 50' N, 156° 10' E), eastern Sea of Okhotsk, Russian Far East. Footprint surveys on a mudflat were used in order to compute the distances and angles between foraging patches, including pecking success information. It was then analyzed how the pecking success at a foraging patch affects the selected distance between foraging patches and turning angles; no correlations were found. However, with increasing scale (size of divider to measure the foraging path) the fractal dimension of the foraging path generally increases, peaking at intermediate scales and then decreases at larger scales. This indicates for the working scale (grain size 1cm, extend 40cm) that Red-necked Stints make their foraging decisions using a static approach (< 20cm step-length, and 10-40° absolute change of angle). On a smaller scale, and once prey was located, they forage in food patches along 'cracks' of the mudflat. It is suggested that fractal dimensions of foraging paths can serve as a basic and quantitative description for the arrangement and distribution of prey patches in mudflats relevant to shorebirds. The presented approach has large potential to describe the efficiency of foraging shorebirds when analyzing pecking success at mudflats along their entire flyways.
机译：在迁移分期地点的红颈St（Calidris ruficollis）的觅食策略实际上是未知的，也没有任何方法可以获取这种关键知识。在这里，首次从1999年秋季迁移期间对Moroshechnaya河口（56°50'N，156°10'E）的细沙泥滩进行的研究中首次提出了一种非侵入性的定量觅食路径计算方法。 ），鄂霍次克海东部，俄罗斯远东地区。为了计算觅食斑块之间的距离和角度（包括啄食成功信息），使用了在滩涂上的足迹调​​查。然后分析了觅食斑块的啄食成功如何影响觅食斑块和转向角度之间的选定距离；没有发现相关性。但是，随着规模的增加（用于测量觅食路径的分隔线的大小），觅食路径的分形维数通常会增加，在中间尺度处达到峰值，然后在较大尺度处减小。这表明对于工作规模（粒度1厘米，延伸40厘米），红颈-使用静态方法（<20厘米步长，角度绝对变化10-40°）做出觅食决定。在较小的规模上，一旦找到了猎物，它们就会沿着泥滩的“裂缝”觅食。建议觅食路径的分形维数可以作为与水鸟有关的滩涂中猎物斑块的布置和分布的基本和定量描述。提出的方法在分析沿整个飞行路线的滩涂成功啄食成功时具有描述水鸟觅食效率的巨大潜力。

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