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首页> 外文期刊>Marine ecology progress series >Intertidal migration and habitat use by subadult Dungeness crab Cancer magister in a NE Pacific estuary
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Intertidal migration and habitat use by subadult Dungeness crab Cancer magister in a NE Pacific estuary

机译：东北太平洋河口的成年雌性大蟹蟹巨蟹座潮间带迁移和栖息地利用

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摘要

Tidal migrations are inherent in the life histories of numerous demersal predators, and both the indirect and direct effects of these forays are important to the structure and function of littoral communities. In coastal estuaries of the Northeastern Pacific, Dungeness crabs Cancer magister are abundant and compose a significant portion of estuarine biomass. The nursery role of complex littoral habitats for young-of-the-year (0+) C. magister is well documented, yet the ecology of subsequent age classes within coastal estuarine systems, and within littoral areas in particular, remains unclear. The goal of our study was to elucidate habitat use and migratory patterns of subadult C. magister (40 to 130 mm carapace width; 1+ and >1+ yr classes) in littoral eelgrass Zostera marina, oyster Crassostrea gigas, and unstructured littoral habitats (ULH). We employed 3 sampling techniques (trapping, acoustic telemetry, and underwater video) designed to examine various aspects of migratory behavior within Willapa Bay, Washington, a representative coastal estuary. Baited trap surveys revealed that relative catches of subadult C. magister are 30 to 50% higher on ULH than eelgrass or oyster beds, and are negatively correlated with catches of another large cancrid crab, C. productus. Ultrasonic telemetry observations suggest that subadult C. magister making nighttime foraging incursions prefer ULH to other littoral habitats, and underwater video observations show that migrations are influenced by tidal rhythms since movements are correlated with the direction and velocity of current flow in adjacent channels. Our results dramatically alter the perception of C. magister as a predominantly sublittoral predator, and underscore the significance of littoral habitats as important foraging areas.
机译：潮汐迁徙是许多海底捕食者生活史中固有的，这些进击的间接和直接影响对沿海社区的结构和功能都很重要。在东北太平洋的沿海河口，太平洋大蟹蟹巨蟹座丰富，构成河口生物量的很大一部分。复杂的滨海生境对年少（0+）的美人鱼的保育作用已得到充分证明，但是在沿海河口系统中，尤其是沿岸地区，后续年龄级别的生态仍然不清楚。我们研究的目的是阐明滨海鳗类动物Zostera滨海，牡蛎Crassostrea gigas和非结构化滨海栖息地（40-130 mm甲壳宽度； 1+和> 1+ yr以上等级）的亚成体C. magister的栖息地使用和迁徙模式。 ULH）。我们采用了3种采样技术（诱捕，声音遥测和水下视频）来检查代表性的华盛顿州华盛顿州Willapa湾内迁徙行为的各个方面。有诱饵的诱捕器调查显示，在超高空捕捞中，成年亚种梭子蟹的相对捕获量比鳗草或牡蛎床高30％至50％，并且与另一只大型蟹蟹的捕获量呈负相关。超声遥测观测结果表明，亚夜蛾成虫在夜间觅食时，比其他沿海生境更喜欢ULH，而水下视频观测表明，潮汐节律影响了迁徙，因为其运动与相邻通道中水流的方向和速度相关。我们的结果极大地改变了马格纳斯捕食者主要是沿岸捕食者的观念，并强调了沿岸栖息地作为重要觅食区的重要性。

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