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Testing the shallow water refuge hypothesis in flatfish nurseries

机译：在比目鱼苗圃中检验浅水避难所假说

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摘要

The 'shallow water refuge hypothesis' (SWRH) holds that predation upon juvenile fish and crustaceans is reduced in shallow water because larger predatory fish increase in abundance with depth. We tested predictions of this hypothesis in 2 Kodiak Island flatfish nurseries, Pillar Creek Cove and Holiday Beach, using baited camera, tethering and video sled techniques. Baited camera deployments during 2007 indicated that predators increased with depth in both nurseries. In the same year, tethering indicated increased mortality of juvenile flatfish with increased depth. In contrast, video sled data from 2003 and 2004 indicated that predator abundance increased with depth at Holiday Beach, but not at Pillar Creek Cove. At Holiday Beach, juvenile abundance decreased rapidly with depth, while at Pillar Creek Cove abundance increased slightly with depth. Thus, preda-tor-predation distribution over 3 yr at Holiday Beach was consistent with the SWRH, while at Pillar Creek Cove it was more variable. Although the SWRH is normally considered in the context of waters <2 m in depth, our results suggest that it may have efficacy for deeper water, with the relative depth distribution of predators and suitable juvenile habitat being more relevant than absolute depth.
机译：“浅水避难所假说”（SWRH）认为，浅水区对幼鱼和甲壳类动物的捕食会减少，因为较大的掠食性鱼会随着深度的增加而增加。我们使用诱饵式摄像头，网络共享和视频雪橇技术在2个科迪亚克岛比目鱼苗圃，支柱溪湾和假日海滩中测试了该假设的预测。 2007年诱饵式摄像机的部署表明，两个苗圃中的食肉动物都随着深度的增加而增加。同年，拴系表明随着深度的增加，幼体比目鱼的死亡率增加。相反，2003年和2004年的视频雪橇数据表明，假日海滩的捕食者数量随深度增加而增加，而比拉尔克里克湾则没有。在假日海滩，少年的丰富度随着深度的增加而迅速降低，而在皮拉尔克里克湾的丰富度随着深度的增加而略有增加。因此，假日海滩3年内的捕食者-捕食者分布与SWRH一致，而在Pillar Creek Cove则更大。尽管通常在深度小于2 m的水域中考虑SWRH，但我们的结果表明它可能对更深的水域有效，捕食者和合适的幼体栖息地的相对深度分布比绝对深度更重要。

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  • 来源
    《Marine ecology progress series》 |2010年第15期|p.275-282|共8页
  • 作者

    C. H. Ryer; B. J. Laurel; A. W. Stoner;

  • 作者单位

    Fisheries Behavioral Ecology Program, Alaska Fisheries Science Center, NOAA Fisheries, Hatfield Marine Science Center, 2030 Marine Science Drive, Newport, Oregon 97365, USA;

    rnFisheries Behavioral Ecology Program, Alaska Fisheries Science Center, NOAA Fisheries, Hatfield Marine Science Center, 2030 Marine Science Drive, Newport, Oregon 97365, USA;

    rnFisheries Behavioral Ecology Program, Alaska Fisheries Science Center, NOAA Fisheries, Hatfield Marine Science Center, 2030 Marine Science Drive, Newport, Oregon 97365, USA;

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  • 正文语种 eng
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  • 关键词

    nurseries; predation; tethering; baited camera; video sled; fish behavior;

    机译：托儿所;掠夺系留诱饵相机视频底座鱼的行为;

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