URBAN FOREST PATCHES AND STOPOVER DURATION OF MIGRATORY SWAINSON'S THRUSHES
URBAN FOREST PATCHES AND STOPOVER DURATION OF MIGRATORY SWAINSON'S THRUSHES
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DOI：
10.1525/cond.2010.090049
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发表时间：
2010-02-01
期刊：
影响因子：
3.1
通讯作者：
Rodewald, Paul G.
中科院分区：
文献类型：
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作者：
Matthews, Stephen N.;Rodewald, Paul G.
在非繁殖地和繁殖地之间的长距离迁徙需要使用多个中途停留点，鸟类必须在那里补充燃料以满足迁徙的能量需求。遇到城市景观的迁徙森林鸟类经历了高度的栖息地破碎化，通常使用小的，孤立的森林斑块。我们调查的影响因素停留时间（停留时间）和迁移离开斯文森的画眉（Catharus ustulatus）使用森林斑块内的城市景观在哥伦布，俄亥俄州。在2004年至2007年5月期间，我们安装了69斯文森的画眉0.66克无线电发射器，实验性地将鸟类迁移到7个成熟的森林网站，不同的面积和城市化程度，并监测每一个人每天，直到它离开。平均最短中途停留时间为3.7天（+/- 3.4 SD），范围为1 - 12天。中途停留时间呈负相关的迁移（朱利安日期）和精力充沛的条件下捕获的进步，离开中途停留地点与低风速和下降的气压。我们发现，尽管森林面积和城市化程度有很大的变化，但在七个城市站点的中途停留时间没有差异。Swainson的画眉有很强的网站韧性，在五个最大的（11.9-38.4公顷）的网站，100%的鸟类，直到迁徙出发，相比之下，28%的个人离开最小的（0.7和4.5公顷）的网站在中途停留。结果表明，城市内的残林补丁可能会提供斯文森的画眉与合适的中途停留的机会，而不会强烈影响他们的迁徙时间表，但最低面积要求可能会限制画眉的使用一些补丁。
Long-distance migration between nonbreeding and breeding grounds involves use of multiple stopover sites where birds must refuel to meet the energetic demands of migration. Migrant forest birds that encounter urban landscapes experience high levels of habitat fragmentation and often use small, isolated forest patches. We investigated factors influencing stopover duration (length of stay) and migratory departure of Swainson's Thrushes (Catharus ustulatus) using forest patches within an urban landscape in Columbus, Ohio. During May, 2004-2007, we fitted 69 Swainson's Thrushes with 0.66-g radio transmitters, experimentally relocated the birds to seven mature forest sites that varied in area and degree of urbanization and monitored each individual daily until it departed. Mean minimum stopover duration was 3.7 days (+/- 3.4 SD), ranging from 1 to 12 days. Stopover duration was negatively related to advancement of migration (Julian date) and energetic condition at capture, and departure from stopover sites was associated with low wind speed and declining barometric pressure. We found no difference in stopover duration across the seven urban sites despite large variation in forest area and degree of urbanization. Swainson's Thrushes had strong site tenacity at the five largest (11.9-38.4 ha) sites, where 100% of birds remained until migratory departure; in contrast, 28% of individuals left the smallest (0.7 and 4.5 ha) sites during stopover. Results suggest that patches of remnant forest within cities may provide Swainson's Thrushes with suitable stopover opportunities without strongly influencing their migratory schedule, but minimum area requirements may limit the thrushes' use of some patches.