Facultative altitudinal movements by Mountain White-crowned Sparrows (Zonotrichia leucophrys oriantha) in the Sierra Nevada
Facultative altitudinal movements by Mountain White-crowned Sparrows (Zonotrichia leucophrys oriantha) in the Sierra Nevada
复制标题
DOI：
10.1642/0004-8038(2004)121
复制
发表时间：
2004-10-01
期刊：
影响因子：
2.8
通讯作者：
Morton, ML
中科院分区：
文献类型：
--
作者：
Hahn, TP;Sockman, KW;Morton, ML
山白冠麻雀（Zonotrichia leucophrys oriantha）在墨西哥过冬，经常在筑巢之前就到达内华达州的繁殖地附近。到达加州的泰奥加山口（海拔3,030米）通常发生在5月初，但残留的冬季积雪和不利的天气会推迟筑巢数周。我们使用无线电遥测技术，以确定是否预繁殖山白冠麻雀从事与天气有关的海拔运动之间的等待期间，春季迁移结束和繁殖开始在1995-2001年，与一系列的剩余冬季积雪。到达日期和产卵开始的年际变化分别为18和41天。我们跟踪了两年的女性和七年的男性。在四年一遇的春季暴风雪期间，有放射性标记的个体会迁移到海拔较低的地方，并在那里停留数天。离开的鸟儿在下午早些时候离开了泰奥加山口，在暴风雨过后的清晨返回。更频繁的风暴跟踪期间增加的可能性，任海拔运动，但较重的剩余冬季积雪没有。温暖的日子增加了鸟类从低海拔返回泰奥加山口的可能性。这项研究表明，兼性海拔运动行为可以是一个共同的特点，春季到来的生物学在蒙大拿州繁殖的鸟类。收文日期：2002年11月1日，接受日期：2004年6月30日。
Mountain White-crowned Sparrows (Zonotrichia leucophrys oriantha) winter in Mexico and often arrive in the vicinity of their breeding grounds in the Sierra Nevada well before nesting is possible. Arrival at Tioga Pass, California (elevation 3,030 m), usually occurs in early May, but residual winter snow and adverse weather can delay nesting for weeks. We used radiotelemetry to determine whether prebreeding Mountain White-crowned Sparrows engaged in weather-related altitudinal movements during the waiting period between the end of spring migration and onset of breeding during 1995-2001, with a range of residual winter snowpacks. Interannual variation in arrival date and onset of egg laying was 18 and 41 days, respectively. We tracked females for two years and males for all seven years. During spring snowstorms (which occurred in four years), radiomarked individuals moved to lower elevation sites, where they often remained for several days. Departing birds left Tioga Pass by early afternoon and returned early in the morning after storms. More frequent storms during tracking increased the likelihood of facultative altitudinal movements, but heavier residual winter snowpack did not. Warm days increased the likelihood of birds returning to Tioga Pass from low elevation. This study demonstrates that facultative altitudinal movement behavior can be a common feature of spring arrival biology in montane-breeding birds. Received 1 November 2002, accepted 30 June 2004.