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Resource selection by juvenile Swainson's Thrushes during the postfledging period

机译：幼年斯旺森鹅口疮的资源选择

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Resource-selection studies of passerine birds during the breeding season have mainly been limited to understanding those factors important to nesting. However, little is known about what resources are selected by juveniles that are no longer dependent on their parents. The postfledging period may be a critical part of the breeding season for independent juveniles because they must avoid predators and learn to forage on a changing resource base. We used radio-telemetry to study postfledging habitat use and resource selection of juvenile Swainson's Thrushes (Catharus ustulatus) in coastal California from 2000 to 2002. We generated popul ation- level contours (50% and 95% fixed-kernel) to describe habitat use by independent juveniles, and we determined juvenile resource selection by comparing vegetation characteristics at sites used by juveniles versus random sites. Juvenile Swainson's Thrushes used mixed-hardwood forest and coastal scrub during the postfledging period as well as riparian vegetation used by nesting adults. The most parsimonious predictors of resource selection were fruit abundance variables, suggesting that postfledging habitat selection by the Swainson's Thrush is best explained by the optimal-foraging hypothesis. We suggest that juvenile thrushes can track food resources in a habitat mosaic and use vegetation types distinct from what is traditionally considered Swainson's Thrush breeding habitat.
机译：在繁殖季节对雀形目鸟类的资源选择研究主要限于了解那些对筑巢重要的因素。但是，对于不再依赖父母的未成年人所选择的资源知之甚少。对于幼体而言，后雏期可能是繁殖季节的关键部分，因为它们必须避免掠食者并学会在不断变化的资源基础上觅食。我们使用无线电遥测技术研究了2000年至2002年加利福尼亚州沿海地区青少年Swainson鹅口疮（Catharus ustulatus）的生后栖息地使用和资源选择。我们生成了人口水平等高线（50％和95％固定内核）来描述栖息地的使用通过独立的少年，我们通过比较少年使用地点和随机地点的植被特征来确定少年资源的选择。斯旺森鹅口疮少年在后迁徙时期使用混合硬木森林和沿海灌木丛，以及筑巢成年时使用的河岸植被。资源选择的最简约预测因子是水果丰度变量，这表明通过最佳觅食假说可以最好地解释Swainson鹅口疮的后生栖息地选择。我们建议，幼鹅口疮可以追踪栖息地马赛克中的食物资源，并使用不同于传统上被认为是斯温森鹅口疮繁殖栖息地的植被类型。

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