STOPOVER OF NEOTROPICAL LANDBIRD MIGRANTS ON EAST SHIP ISLAND FOLLOWING TRANS-GULF MIGRATION
STOPOVER OF NEOTROPICAL LANDBIRD MIGRANTS ON EAST SHIP ISLAND FOLLOWING TRANS-GULF MIGRATION
复制标题
新热带陆鸟迁徙在跨海湾迁徙后在东船岛停留
DOI：
--
复制
发表时间：
1991
期刊：
影响因子：
--
通讯作者：
T. Simons
中科院分区：
文献类型：
--
作者：
A. Kuenzi;F. Moore;T. Simons
研究了1987年、1988年和迁徙后新热带土鸟迁徙的生理生态与能量状态的关系。在密西西比州海岸外的障碍岛东船岛捕获的大多数鸟类，已经耗尽了穿越墨西哥湾的脂肪储备，接近无脂肪质量。在第一次捕获鸟类的当天之后，几乎没有鸟被重新捕获，这表明候鸟在到达当天或当晚就离开了。在重新捕获的移民样本中，瘦移民的出现频率更高，尽管停留时间不是抵达数量的明显函数，数量变化也不是简单地随着中途停留时间的增加而增加。大多数物种的特征是体重下降或在中途停留期间基本上保持到达体重的变化率。几个物种的质量变化率与能量需求呈正相关。脂肪耗竭的鸟类似乎通过增加它们的能量获取速度来弥补它们的状况。对猎物丰度的估计在不同年份之间没有不同，这可能解释了为什么中途停留时间和增殖率在不同年份之间没有变化。我们的结论是，许多移民离开ES1是因为他们发现满足能源需求的机会很少，而其他人留下来是因为与他们的能源平衡无关的限制，或者是因为拒绝栖息地的好处超过了寻找更合适地点的成本。Kev字：MR精力充沛；，脂肪沉积。-
The ecophysiology of Neotropical landbird migrants was studied in relation to energetic condition following trans-Gulf migration in 1987, 1988, and 1989. Most birds captured on East Ship Island, a barrier island off the Mississippi coast, had exhausted fat reserves crossing the Gulf of Mexico and were near fat-free mass. Few birds were recaptured after the day of their first capture, suggesting that migrants departed the day of their arrival or that night. Lean migrants occurred more frequently in samples of recaptured migrants, although length of stay was not a clear function of arrival mass nor did change in mass simply increase with stopover length. Most species were characterized by loss of body mass or by rates of change that essentially maintained arrival mass during stopover. Rates of change in mass were positively correlated with energy demand for several species. Fatdepleted birds appeared to compensate for their condition, presumably by increasing their rate of energy acquisition. Estimates of prey abundance did not differ between years, which might explain why stopover length and rate of gain did not vary between years. We conclude that many migrants left ES1 because they found few opportunities to satisfy energy demand, while others stayed because of constraints unrelated to their energy balance or because the benefits of rejecting the habitat were outweighed by the cost of finding a more suitable site. Kev words: Mr energetic condition; ,fat deposition. -