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首页> 外文期刊>Marine ecology progress series >Oceanographic, acoustic, and remote approaches reveal the spatio-temporal dynamics of blackfin snapper at an aggregation site in Palau
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Oceanographic, acoustic, and remote approaches reveal the spatio-temporal dynamics of blackfin snapper at an aggregation site in Palau

机译：海洋学，声学和遥远方法揭示了帕劳聚集地的黑鳍鲷鱼的时空动态

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Forming spawning aggregations is a critical life-history activity for fish, but it is unclear what physical conditions are associated with fish behavior at specific sites. The habitat, movements and distribution of blackfin snapper Lutjanus fulvus at a monthly aggregation site in Palau were studied using a combination of instruments and approaches, including active/passive acoustics, time-lapse cameras, an autonomous underwater vehicle, current profilers, and high resolution bathymetry. We found that L. fulvus predictably form a large pre-spawning aggregation of an estimated 15 000 fish in a small zone (10s of m) in a tidally forced channel. The aggregation spans 125 m along the northern channel wall, with the highest densities of fish from 9 to 13 m and 15 m from the wall where current velocities are 0.25 m s(-1). The aggregation occurs within an indent in the channel wall where an abrupt change in bathymetry creates a visible eddy-like feature during outgoing tides. The aggregation forms year-round, for 6 d each moon cycle, starting 1 d before the full moon to 4 d after. During the study, 4 tagged fish returned to the site for 6 consecutive lunar cycles; however, residency times within aggregation periods was similar to 1.5 d on average. Densely aggregated fish were present during the day, but migration patterns of tagged fish revealed regular evening migrations to and from the channel mouth, consistently at the highest tide of the day, a behavior assumed for spawning. These observations reveal some physical processes and biological patterns surrounding the formation and function of fish aggregations.
机译：形成产卵聚集体是鱼类的重要生命历史活动，但是尚不清楚特定地点的鱼类行为与哪些物理条件有关。利用组合的仪器和方法，包括主动/被动声学，延时摄影机，自动水下航行器，电流剖面仪和高分辨率，研究了帕劳每月聚集地点黑鳍鲷snap鱼（Lutjanus fulvus）的栖息地，运动和分布。测深法。我们发现，L。fulvus可以在潮汐强迫通道的一个小区域（10微米长）中形成约1.5万条鱼的大型产卵前聚集体。聚集体沿北河道壁跨度为125 m，最高密度为9至13 m，距壁的<15 m处的鱼类密度最高，当前速度<0.25 m s（-1）。凝集发生在通道壁的凹痕内，在该处，测深的突然变化会在流出潮汐时产生可见的涡状特征。聚合形成全年，每个月周期6 d，从满月前1 d开始到之后4 d。在研究过程中，有4条带标签的鱼连续6个月球周期返回该地点。但是，聚集期内的驻留时间平均约为1.5 d。白天有密集的鱼类聚集，但带标签的鱼类的迁移模式显示出晚上有规律的夜间进出海峡口的迁移，始终是一天中的最高潮，这种行为被认为是产卵的。这些观察结果揭示了鱼聚集体形成和功能的一些物理过程和生物学模式。

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