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首页> 外文期刊>Marine ecology progress series >Vertical habitat use of Atlantic blue marlin Makaira nigricans: interaction with pelagic longline gear
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Vertical habitat use of Atlantic blue marlin Makaira nigricans: interaction with pelagic longline gear

机译：大西洋蓝枪鱼马卡伊拉黑狼人的垂直栖息地利用：与中上层延绳钓渔具的相互作用

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We characterized Atlantic blue marlin Makaira nigricans temperature-depth vertical habitat utilization from data collected using 51 electronic pop-up satellite archival tags (PSATs) attached to fish released by recreational and commercial fishers. Most source data were in the form of 3 or 6 h, temperature- and depth-frequency histograms transmitted b.y the tags to the ARGOS satellite system. However, high resolution time series of temperatures, depths (30 or 60 s resolution), and light intensity were obtained from 6 tags that were physically recovered. The distributions of times at depth were significantly different between day and night. During daylight hours, the fish were typically below the near-surface layer, often at 40 to > 100 m, sometimes remaining below the near-surface layer at depth throughout the daylight hours, but often returning briefly to the surface. At night, the fish spent most of their time at or very close to the surface. This pattern of behavior also meant that the distributions of time at temperature were significantly different between day and night, with the fish occupying warmer strata during darkness. We evaluated the fractions of time spent by each fish within each degree of water temperature relative to the temperature of the surface mixed layer to assess assumptions used to model population abundance trends from pelagic longline catch per unit effort (CPUE) data. Frequency distributions were determined for periods of darkness, daylight and, where possible, twilight. Results were highly variable within the time series for individual fish and among individuals. Assumptions about habitat usage in previous CPUE analyses are clearly inappropriate and may lead to serious errors that can propagate through the fisheries management system.
机译：我们通过使用51种电子弹出式卫星档案标签（PSAT）收集的数据来表征大西洋蓝枪鱼Makaira nigricans温度深度垂直栖息地的利用，这些标签与休闲和商业捕鱼者释放的鱼类相连。大多数源数据以3或6小时的形式出现，温度和深度频率直方图通过标签传输到ARGOS卫星系统。但是，从6个物理回收的标签中获得了温度，深度（30或60 s分辨率）和光强度的高分辨率时间序列。白天和晚上，深层时间的分布明显不同。在白天，鱼通常在近表层以下，通常在40至> 100 m，有时在整个白天都停留在近表层以下的深度，但通常会短暂返回表层。在晚上，鱼大部分时间都在水面或非常接近水面的地方。这种行为方式还意味着白天和晚上的温度时间分布明显不同，在黑暗中鱼占据了较暖的地层。我们评估了每种鱼类在相对于表面混合层温度的每个水温范围内所花费的时间比例，以评估用于根据上浮式延绳钓每单位工作量（CPUE）数据建模种群丰度趋势的假设。确定了黑暗，白天和可能的暮光时期的频率分布。在单个鱼的时间序列内以及个体之间的结果差异很大。在以前的CPUE分析中关于栖息地使用的假设显然是不合适的，并且可能导致严重的错误，并可能通过渔业管理系统传播。

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