Dynamics of summer flounder, Paralichthys dentatus, seasonal migrations based on ultrasonic telemetry
Dynamics of summer flounder, Paralichthys dentatus, seasonal migrations based on ultrasonic telemetry
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基于超声波遥测的夏季牙鲆、牙牙鲆的动态、季节性迁徙
DOI：
10.1016/j.ecss.2007.03.027
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发表时间：
2007
影响因子：
2.8
通讯作者：
T. Grothues
中科院分区：
文献类型：
--
作者：
Dana K Sackett;K. Able;T. Grothues
中大西洋湾（MAB）夏季比目鱼（parichthys dentatus）从河口到大陆架的迁徙是季节性的，但其动态尚不清楚。2003-2005年，采用被动和主动超声遥测法测定了新泽西州南部穆里卡河-大湾河口夏季比目鱼幼鱼和成鱼（长度为262 - 535mm）洄游时间和洄游率。此外，对新泽西州外大陆架内部进行了7年的调查，以评估互补的季节性运动。大多数被标记的鱼在7月至9月之间从河口迁出，尽管迁出持续到12月，并且似乎受到许多因素的影响。2004年7月，有更多带标签的鱼类在风暴期间，在低气压下迁徙，迁徙速度加快。内部架子上的拖网收集显示了与遥测所看到的相同的近似迁移时间。在秋季后期，随着溶解氧的减少，带标签的夏比目鱼从河口迁移的数量增加。秋季拖网调查显示，当穆里卡河-大湾河口的溶解氧减少时，内大陆架上的鱼类数量增加，这支持了遥测结果。鱼类在白天和夜间从河口洄游，但夜间在较深的水域洄游，洄游速度略慢。出境和再入境也发生在秋季移民。在研究的第二年和第三年，超声波标记的个体通过在3月至6月返回同一河口（分别为39% - 6%）来证明归巢。综上所述，夏季比目鱼的大量洄游可能是洄游的结果。迁徙可能与偶发尺度的风暴有关，与季节性尺度的溶解氧和温度有关。
Migrations of summer flounder, Paralichthys dentatus, to and from estuaries to the continental shelf in the Mid-Atlantic Bight (MAB) occur seasonally but their dynamics are poorly understood. Ultrasonic telemetry, both passive and active, was used during 2003–2005 to determine timing and rate of juvenile and adult summer flounder (268–535mm TL) migrating to and from the Mullica River–Great Bay estuary in southern New Jersey. Additionally, 7 years of inner continental shelf surveys off New Jersey were used to assess complementary seasonal movements. Most tagged fish emigrated from the estuary between July and September, though emigration lasted into December and appeared to be influenced by a number of factors. In July 2004, more tagged fish emigrated, at increased rates of movement, at low barometric pressure during a storm event. Trawl collections on the inner shelf demonstrated the same approximate immigration times as seen with telemetry. Later in the fall, increased numbers of tagged summer flounder emigrated from the estuary when dissolved oxygen was decreasing. Fall trawl surveys showed increased numbers of fish on the inner shelf when dissolved oxygen was decreasing in the Mullica River–Great Bay estuary, supporting the telemetry results. Fish emigrated from the estuary during the day and night but nighttime movements were in deeper water at slightly slower rates of movement. Exit and re-entry also occurred during the fall emigration. Ultrasonically tagged individuals demonstrated homing by returning to the same estuary, in March through June, in the second and third year of the study (39–6%, respectively). In summary, immigration may result from homing for a large proportion of summer flounder. Emigration may be associated with storms on an episodic scale, and dissolved oxygen and temperature on a seasonal scale.