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首页> 外文学位 >Relations of nesting behavior, nest predators, and nesting success of wood thrushes (Hylocichla mustelina) to habitat characteristics at multiple scales (West Virginia).
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Relations of nesting behavior, nest predators, and nesting success of wood thrushes (Hylocichla mustelina) to habitat characteristics at multiple scales (West Virginia).

机译：鹅口疮（Hylocichla mustelina）的筑巢行为，筑巢捕食者和筑巢成功与多种尺度下的栖息地特征之间的关系（西弗吉尼亚）。

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During 1998–2000, I examined the relationship between the reproductive success of a declining Neotropical migrant songbird, the wood thrush ( Hylocichla mustelina), and surrounding habitat within the highly forested region encompassing the northwestern portion of the Monongahela National Forest, West Virginia, USA. I measured nest fate, food delivery rates, and nest attendance rates of 56 videotaped nests and then related these variables to habitat measured at three concentric scales: nest site (11.3 m radius), territory (100 m), and landscape (1000 m). Predation was the most common source of failure (23 of 26 failed nests), and southern flying squirrels ( Glaucomys volans) were the most common predator (n = 8). Probability of fledging was positively related to territory level amount of 30–49 yr old forest, and at the landscape level was negatively related to open, non-forested area and positively related to mean patch fractal dimension (a measure of shape complexity) of mature (>50 yr old) forest. I found no evidence of nestling food limitation, but, as with probability of fledging, food deliveries and nest attendance rates were positively related to measures of shape complexity of mature forest within the landscape. I also used videotapes of nests to examine the efficacy of traditional methods of predicting nest predators and nest fates. Specifically, I predicted the nest predator group (avian, mammalian, snake; all 56 nests) and nest fate (fledge/fail; n = 27 nests) of nests and compared my predictions with videotaped results. Nest predator group was incorrectly assigned for 12 of 21 depredated nests for which predator identity was known. Fates of 23 of 27 nests were correctly classified. Thus, traditional methods appear to be effective at assigning nest fate, but ineffective at classifying nest predator. In another study, I compared four years (1996–1999) of off-road point counts of forest dwelling songbirds with counts from the North American Breeding Bird Survey (BBS) routes in the region. I generally found low agreement between BBS counts and point counts. I discuss possible reasons for this lack of agreement.
机译：在1998-2000年期间，我研究了下降的新热带移民鸣鸟，木材画眉（ Hylocichla mustelina ）的繁殖成功与包围莫农加黑拉西北的森林茂密地区周围栖息地之间的关系。美国西弗吉尼亚国家森林公园。我测量了56个录像带筑巢的筑巢命运，食物输送率和筑巢出席率，然后将这些变量与以三个同心尺度测量的栖息地相关联：筑巢地点（半径11.3 m），领土（100 m）和景观（1000 m） 。捕食是最常见的失败来源（26个失败的巢中有23个），南部的飞鼠（ Glaucomys volans ）是最常见的捕食者（n = 8）。出苗的可能性与30-49岁的老森林的地域水平成正相关，而在景观水平上与成熟的裸地，非林区负相关，与成熟的平均斑块分形维数（形状复杂程度的度量）成正相关。 （> 50岁）森林。我没有发现有巢穴食物限制的证据，但是，随着出雏的可能性，食物的输送和巢的出勤率与景观内成熟森林的形状复杂性的度量呈正相关。我还用录像带对巢进行了研究，以检验传统预测巢捕食者和巢命运的方法的功效。具体来说，我预测了巢捕食者组（鸟类，哺乳动物，蛇；共56个巢）和巢的命运（立危/失败； n = 27个巢），并将我的预测与录像结果进行了比较。为已知捕食者身份的21个过时的巢中的12个，巢捕食者组分配错误。对27个巢中的23个的命运进行了正确分类。因此，传统方法似乎可以有效地分配巢穴命运，但不能有效地对巢穴捕食者进行分类。在另一项研究中，我比较了四年（1996-1999年）森林栖居鸣禽的越野点计数与该地区北美繁殖鸟类调查（BBS）路线的计数。我通常发现BBS计数和点计数之间的一致性较低。我讨论了这种不一致的可能原因。

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