Pelagic to Benthic Coupling in Lobster (Homarus americanus) Recruitment

龙虾（美洲白鹤）招募中的中上层与底栖耦合

• 批准号: 9202760
• 负责人: Lewis Incze
• 金额: $ 17.26万
• 依托单位: Bigelow Laboratory for Ocean Sciences
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-05-01 至 1997-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9202760&HistoricalAwards=false
• 关键词: Pelagic; Benthic; Coupling; Lobster; Homarus

Rates of larval settlement may be a major determinant of subsequent year-class size for many benthic invertebrates. Often it is difficult, however, to elucidate the relative importance of pre- and post-settlement processes to spatial and temporal variability in recruitment. The American lobster, Homarus americanus, recruits from a pelagic postlarva to shelter- providing benthic substrata, but little is understood about the regulating factors or the consequences of this process. We plan to study the linkage from late pelagic to early benthic phase along the central coast of Maine, where shallow subtidal cobble provides prime recruitment habitat. Our collaborative studies from 1989-1991 suggest that lobster recruitment at some sites may be limited by larval supply, whereas others may be limited by the availability of suitable habitat. We intend to use an experimental approach at two sites that consistently represent the extremes in recruitment density despite apparent similarities of their habitat. At these sites we will use habitat manipulations and postlarval seeding experiments to test the influence of postlarval supply, habitat quality, and density- dependent processes on benthic recruitment. Hydrographic data will be collected to examine possible differences in stratification as well as absolute temperature structure that may influence postlarval diving behavior.

对于许多底栖无脊椎动物来说，幼虫的安置率可能是随后一年的班级大小的主要决定因素。然而，往往很难阐明结算前和结算后进程对征聘的空间和时间变化的相对重要性。美洲龙虾(Homarus Americanus)从一只远洋幼体招募到提供栖息地的海底底质，但人们对这一过程的调节因素或后果知之甚少。我们计划研究缅因州中部海岸从远洋晚期到海底早期的联系，那里的浅潮下鹅卵石提供了主要的补充栖息地。我们1989-1991年的合作研究表明，龙虾在某些地点的招募可能受到幼体供应的限制，而另一些地点可能受到合适栖息地可用性的限制。我们打算在两个地点使用实验方法，这两个地点始终代表着招募密度的极端，尽管它们的栖息地明显相似。在这些地点，我们将使用栖息地操纵和幼虫后播种实验来测试仔鱼供应、栖息地质量和依赖密度的过程对底栖动物招募的影响。将收集水文数据，以检查可能存在的层积差异以及可能影响幼虫潜水行为的绝对温度结构。