根据树液行调查计算出的欧亚三趾啄木鸟的密度与固定路线鸟类普查的估计值相当

Q4 Agricultural and Biological Sciences Ornis Svecica Pub Date : 2021-09-10 DOI:10.34080/os.v31.22416
Björn Ferry, J. Ekenstedt, Martin Green
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引用次数: 3

摘要

物种特异性追踪动物是绘制即使存在也很难找到的物种地图的有效方法。我们利用对树木树液行的观察来计算欧亚三趾啄木鸟的密度。2020年秋季,我们调查了瑞典北部山地森林下方的14条固定路线的树液行。我们使用我们对新鲜树液行的观察,以及文献中得出的每年活动区域的平均范围和比例,来计算大规模啄木鸟的种群密度。基于树液行的密度为0.19对/km2。Västerbotten县山地森林以下不同地区的固定路线鸟类观测密度为每平方公里0.13–0.14对,与树液行的估计相对一致。我们还计算了山地森林中固定路线观测的种群密度,这些密度几乎高出三倍。我们的密度计算对应于Västerbotten县的7900对。这些结果表明,系统的树液行计数可以快速提供可靠的欧亚三趾啄木鸟种群密度估计。
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Densities of the Eurasian Threetoed Woodpecker Picoides tridactylus calculated from sap row surveys are on par with estimates from fixed route bird censusing
Species-specific tracks animals can be an effective way of mapping species that are hard to find even if they are present. We used observations of sap rows on trees to calculate densities of Eurasian Three-toed Woodpeckers Picoides tridactylus. We surveyed 14 fixed routes in northern Sweden below the montane forest for sap rows during the autumn of 2020. We used our observations of fresh sap rows together with average home range and proportion of active territories per year derived from the literature, to calculate large-scale woodpecker population density. The density based on sap rows was 0.19 pairs per km2. Densities from fixed route bird observations for different parts of Västerbotten County below the montane forests were 0.13–0.14 pairs per km2, in relative agreement with the estimates from sap rows. We also calculated the population density from fixed route observations in the montane forests, and these were almost three times higher. Our density calculations correspond to 7,900 pairs in Västerbotten County. These results indicate that systematic counts of sap rows can quickly provide credible population density estimates of Eurasian Three-toed Woodpeckers.
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来源期刊
Ornis Svecica
Ornis Svecica Agricultural and Biological Sciences-Animal Science and Zoology
CiteScore
0.70
自引率
0.00%
发文量
5
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