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首页> 外文期刊>Canadian Journal of Zoology >Estimating snowshoe hare population density from pellet plots: a furtherevaluation
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Estimating snowshoe hare population density from pellet plots: a furtherevaluation

机译:从颗粒地块估计雪鞋野兔种群密度:进一步评估

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摘要

We counted fecal pellets of snowshoe hares (Lepus americanus) once a year in 10 areas in the southwestern Yukon from 1987 to 1996. Pellets in eighty 0.155-m(2) quadrats were counted and cleared each June on all areas, and we correlated these counts with estimates of absolute hare density obtained by intensive mark-recapture methods in the same ar eas. There is a strong relationship between pellet counts and population density (r = 0.76), and we present a predictive log-log regression to quantify this relationship, which improves on our previously published 1987 regression, particularly at low hare densities. The precision of density estimates can be improved most easily by increasing the number of sets of quadrats in an area (one set = 80 plots), rather than increasing the number of plots counted within one set. The must important question remaining concerns the generality of this relationship for snowshoe hares living in other habitats in the eastern and southern portions of their geographic range.
机译:我们从1987年至1996年在育空地区西南部的10个地区每年对粪便中的雪鞋野兔(美国Lepus)进行计数。在每年的6月,对所有区域中的80个0.155-m(2)四方类小球进行计数和清除,并将这些相关联在相同地区通过密集的标记捕获方法获得的绝对野兔密度估计值进行计数。颗粒计数与种群密度之间存在很强的关系(r = 0.76),我们提出了预测对数-对数回归来量化这种关系,这比我们先前发表的1987年回归(特别是在低兔子密度下)有所改善。密度估计的精度可以通过增加一个区域中一组四边形的数量(一组= 80个地块)而不是增加一组中所计数的地块数来最容易地提高。剩下的必须解决的重要问题是,这种关系对于生活在其地理范围东部和南部部分其他栖息地的雪兔的普遍性。

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