DIEL FORAGING BEHAVIOR AND PREY SELECTION IN THE GOLDEN SHINER (NOTEMIGONUS-CRYSOLEUCAS)
DIEL FORAGING BEHAVIOR AND PREY SELECTION IN THE GOLDEN SHINER (NOTEMIGONUS-CRYSOLEUCAS)
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DOI：
10.1139/f79-145
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发表时间：
1979-01-01
期刊：
影响因子：
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通讯作者：
STEWART, AJ
中科院分区：
文献类型：
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作者：
HALL, DJ;WERNER, EE;STEWART, AJ
日迁移的金色闪光灯（N。crysoleucas）从沿岸的到湖沼区的一个小密歇根州[美国]湖记录通过视觉观察和刺网。白天，在沿岸的地带聚集着金色的发光体。日落后，鱼群散去，金色的闪光鱼迁移到湖的开阔水域。金色闪光鱼的进食与夜间迁徙基本一致。大多数的发光人口喂养水蚤和大多数猎物在日落后1小时内获得。夜间进食量最少，黎明时有明显的进食。水蚤经历了一个强大的昼夜垂直迁移，特别是较大的个人，并表现出较强的水平梯度，从湖沼到沿岸的地区的大小和密度下降。在整个晚上进食期间，被黑眼圈吃掉的水蚤的大小急剧增加。这种增加是由于水蚤的水平梯度和较大水蚤迁移到表面时的可用性。只有在猎物密度最高的一个日期，发光者积极选择大型水蚤。金纹鲈在时间和空间上都面临着一个动态的捕食系统，它影响着猎物的选择。小型湖泊中鱼类的相对丰度与洄游食蟹鱼类的适应性有关。
Diel migrations of the golden shiner (N. crysoleucas) from the littoral to limnetic zone of a small Michigan [USA] lake were documented through visual observations and gill netting. During the day golden shiners schooled in the littoral zone. Just after sunset schools broke up and the golden shiner migrated to the open water regions of the lake. Feeding by the golden shiner was largely coincident with the evening migration. The majority of the shiner population fed on Daphnia and most prey were obtained within 1 h of sunset. Feeding was minimal through the night with some feeding evident at dawn. Daphnia underwent a strong diel vertical migration, especially larger individuals, and showed a strong horizontal gradient of decreasing size and density from the limnetic into the littoral region. Size of Daphnia eaten by the shiner increased dramatically across the evening feeding period. This increase is due to the horizontal gradient in Daphnia and availability of larger Daphnia as they migrate to the surface. On only one date when prey densities were highest did the shiners actively select large Daphnia. The golden shiner faces a dynamic prey system both in time and space which influences prey selection. Adaptations of planktivorous fishes that migrate were related to relative abundances of fish in small lakes.