BROWN PELICANS - IMPROVED REPRODUCTION OFF SOUTHERN-CALIFORNIA COAST
BROWN PELICANS - IMPROVED REPRODUCTION OFF SOUTHERN-CALIFORNIA COAST
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DOI：
10.1126/science.1239078
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发表时间：
1975-01-01
期刊：
影响因子：
56.9
通讯作者：
EDGECOMB, WG
中科院分区：
文献类型：
--
作者：
ANDERSON, DW;JEHL, JR;EDGECOMB, WG
尽管仍低于种群稳定的30%，但自1971年以来，加利福尼亚褐鹈鹕在北部两个栖息地的生产力有了显著提高。成年鱼的繁殖数量可能反映了食物供应和从南方更成功的种群中吸收的情况，但雏鸟率的提高（1974年每窝高达0.9只雏鸟）反映了更好的卵存活率和蛋壳状况的改善，凤尾鱼（凤尾鱼的主要食物来源）中的DDE污染有所下降。
Although still about 30 percent too low for population stability, productivity of California brown pelicans at their two northern colonies has improved significantly since 1971. Numbers of adults breeding probably reflect food supplies and recruitment from more successful colonies to the south, but improving fledging rates (up to 0.9 young per nest in 1974) reflect better egg survival and improving eggshell condition, with declining DDE contamination in anchovies, their major food source.