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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Temporal and ontogenetic shifts in habitat use of juvenile Pacific cod (Gadus macrocephalus)
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Temporal and ontogenetic shifts in habitat use of juvenile Pacific cod (Gadus macrocephalus)

机译：少年太平洋鳕鱼（Gadus macrocephalus）栖息地利用的时空变化和遗传学变化

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摘要

Habitat use of age-0 and age-1 juvenile Pacific cod (Gadus macrocephalus) was examined in coastal regions in Kodiak Alaska over daily, seasonal and annual scales. Catch data indicated highly variable recruitment to nursery areas, but a strong separation of distribution by depth among age groups. Age-0 cod were most abundant in the shallows (<3 m) whereas age-1 cod were typically found in depths (9.0-13.5 m). In comparison, age-1 saffron cod (Eleginus gracilis), another highly abundant gadid in the region, were found in shallower depths where age-0 cod often resided. Age-1 cod Pacific cod made diel lateral movements, moving into shallow regions at night where they co-occurred with age-0 cod to a greater extent. Laboratory light-gradient experiments indicated that age-0 cod tolerated intense lighting (-20-80 μE m~(-2) s~(-1)) typical of shallow water regions whereas larger age-1 Pacific cod strongly avoid bright light given the choice. However, while diet data indicate age-1 cod of both species are moderately piscivorous (3% saffron cod; 16% Pacific cod), we found no direct evidence of predation on smaller conspecific cod, possibly due to the low densities of age-0 cod in the year of the diet study. Together, these data suggest that coastal regions continue to serve a nursery function beyond the 1st year of development for juvenile Pacific gadids, and that small-scale temporal and depth partitioning in these regions is a mechanism by which varying cod species and age classes co-occur.
机译：在科迪亚克阿拉斯加沿海地区，按日，季节和年尺度对0岁和1岁少年太平洋鳕鱼（Gadus macrocephalus）的栖息地使用情况进行了调查。渔获量数据显示，苗圃地区的招募变化很大，但年龄组之间的深度分布差异很大。 0岁鳕鱼在浅水区（<3 m）最丰富，而1岁鳕鱼通常在深处（9.0-13.5 m）发现。相比之下，该地区另一种高度丰富的gadad-1藏红花鳕鱼（Eleginus gracilis）被发现在0-鳕鱼经常居住的较浅深度。 1岁鳕鱼太平洋鳕鱼进行diel横向移动，在夜间移入较浅的区域，在那里它们与0岁鳕鱼在更大程度上共存。实验室光梯度实验表明，0岁鳕鱼可忍受浅水区典型的强光（-20-80μEm〜（-2）s〜（-1）），而较大年龄的1太平洋鳕鱼则强烈避免给定明亮的光选择。但是，尽管饮食数据表明两种物种的1岁鳕鱼都具有中等食鱼性（3％藏红花鳕鱼； 16％太平洋鳕鱼），但我们没有发现直接捕食较小的同种鳕鱼的可能，这可能是由于0岁以下的低密度鳕鱼在饮食研究的那一年。综合起来，这些数据表明，沿海地区在太平洋太平洋幼鱼发展到第一年后仍继续发挥苗圃功能，这些地区的小规模时空和深度划分是一种机制，通过这种机制，鳕鱼的种类和年龄类别相互关联。发生。

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    Benjamin J. Laurel; Clifford H. Ryer; Brian Knoth; Allan W. Stoner;

  • 作者单位

    Fisheries Behavioral Ecology Program, Alaska Fisheries Science Center, National Marine Fisheries Service, NOAA, Hatfield Marine Science Center, Newport, OR 97365, USA;

    Fisheries Behavioral Ecology Program, Alaska Fisheries Science Center, National Marine Fisheries Service, NOAA, Hatfield Marine Science Center, Newport, OR 97365, USA;

    Kodiak Fisheries Research Center, Alaska Fisheries Science Center, National Marine Fisheries Service, NOAA, 301 Research Ct. Kodiak, Alaska 99615, USA;

    Fisheries Behavioral Ecology Program, Alaska Fisheries Science Center, National Marine Fisheries Service, NOAA, Hatfield Marine Science Center, Newport, OR 97365, USA;

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  • 关键词

    paited camera; diel behavior; gulf of alaska; habitat selection; nursery habitat;

    机译：彩绘相机行为阿拉斯加湾栖息地选择;苗圃栖息地;

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