Tern Island Albatrosses - 1999

Original provider: Wake Forest University Dataset credits: National Science Foundation Abstract: Satellite telemetry was used to identify the foraging distributions of two congeneric species of albatrosses that nest in the tropics/subtropics. Breeding black-footed albatross (<i>Phoebastria nigripes</i>) and Laysan albatross (<i>Phoebastria immutabilis</i>) nesting in Tern Island (Northwest Hawaiian Islands) and tracked during the 1998 breeding season (January - June) performed foraging trips to continental shelves off North America. Black-footed albatross made long trips to the west coast of North America (British Columbia to California). Laysan albatross traveled primarily to the north of the Hawaiian Islands, and reached the waters of the Aleutian Islands and the Gulf of Alaska. These albatross species mixed short and long trips during the chick-rearing period (February - June), but engaged in short foraging trips during the brooding period (within 18 days after chick hatched, January - February).<br><br> In 1999, the breeding success of both albatross species was depressed, with a large-scale failure for the Laysan albatross. Out of nine black-footed albatross tracked, two chicks died during this study. Out of sixteen Laysan albatross tracked, the eggs of seven birds did not hatch and eight chicks died during the tracking study. Due to this massive breeding failure, the satellite tracked birds abandoned their colony and dispersed widely across the North Pacific Ocean. Thus, the 1998 (central-place foraging) and 1999 (dispersal from colonies) tracking data should be considered separately.原始提供方：维克森林大学（Wake Forest University） 数据集资助方：美国国家科学基金会（National Science Foundation） 摘要： 本研究借助卫星遥测技术，明确了两种营热带/亚热带筑巢的同属信天翁的觅食分布范围。于夏威夷西北群岛特恩岛筑巢的繁殖种群黑脚信天翁（*Phoebastria nigripes*）与莱桑信天翁（*Phoebastria immutabilis*），在1998年繁殖季（1月至6月）被追踪的结果显示，二者均前往北美近海大陆架海域开展觅食活动。其中黑脚信天翁的觅食航程更远，可至北美西海岸（从不列颠哥伦比亚省至加利福尼亚州）；莱桑信天翁则主要前往夏威夷群岛北部海域，最远可达阿留申群岛与阿拉斯加湾水域。两种信天翁在育雏期（2月至6月）会兼顾长短距离觅食航行，但在孵卵期（雏鸟破壳后18天内，即1月至2月）仅开展短距离觅食活动。 1999年，两种信天翁的繁殖成功率均出现下滑，其中莱桑信天翁发生了大规模繁殖失败。本次追踪的9只黑脚信天翁中，有2只雏鸟在研究期间死亡；追踪的16只莱桑信天翁中，7只个体的卵未成功孵化，另有8只雏鸟在追踪研究期间死亡。受此次大规模繁殖失败影响，接受卫星追踪的信天翁弃巢并广泛扩散至北太平洋海域。因此，1998年（中心地觅食）与1999年（种群扩散）的追踪数据需分开分析。