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首页> 外文期刊>Marine ecology progress series >Composition and functional diversity of macrofaunal assemblages on vertical walls of a deep northeast Pacific fjord
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Composition and functional diversity of macrofaunal assemblages on vertical walls of a deep northeast Pacific fjord

机译：东北太平洋深峡湾垂直壁上大型动物组合的组成和功能多样性

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Fjords are temperate zone coastal features with strong horizontal and vertical environmental gradients, but the composition and function of biota living on the confining walls are poorly documented due to relative inaccessibility. We present results from remotely operated vehicle imagery of the subphotic (50 to 680 m depth) bedrock walls from 3 sites in Douglas Channel, a northeast Pacific fjord complex. We assessed the composition and abundance of the wall fauna and correlated these data with the water mass flux character of the fjord. Using a suite of morphological traits, we also identified areas of high function through habitat formation. This baseline record of hard substratum benthos in Douglas Channel revealed diverse assemblages marked by vertical zonation, dense animal cover (= 80% areal cover in some areas), and some variation from fjord head to mouth. The deepest portions of the fjord at our most seaward site (= 400 m) harbored the most taxonomically and functionally rich assemblages, with multiple species exclusive to this zone; there was a sharp increase in animal cover in shallow (= 150 m) areas caused by the appearance of dictyonine glass sponges and increases in articulate brachiopod, zoanthid, and encrusting sponge cover. Animal cover was positively correlated with winter kinetic energy density fluxes, indicating that a consistent oceanic influx augments biomass above 150 m most likely by increasing particle delivery rates. Our findings demonstrate that fjord walls support high biomass, high functioning, diverse, and expansive biosystems that warrant further study and con sideration when developing coastal ocean management plans.
机译：峡湾是温带沿岸特征，具有强烈的水平和垂直环境梯度，但是由于相对难以接近，因此很难记录生活在封闭壁上的生物群的组成和功能。我们介绍了来自东北太平洋峡湾区道格拉斯海峡3个站点的亚光（深度为50至680 m）基岩墙的遥控车辆图像的结果。我们评估了壁动物的组成和丰度，并将这些数据与峡湾的水质通量特征相关联。利用一套形态学特征，我们还通过栖息地的形成确定了高功能区域。道格拉斯海峡坚硬的底栖底栖动物的基线记录显示，垂直分区，动物密集覆盖（某些区域> 80％的区域覆盖）和峡湾头到嘴的某些变化标志着各种组合。在我们最靠海的地点（<= 400 m），峡湾的最深处藏有分类学和功能最丰富的组合，该区域除外。 cisyonine玻璃海绵的出现导致浅层（<= 150 m）区域动物的覆盖率急剧增加，而臂突臂足，zoanthid和结壳的海绵覆盖率增加。动物的覆盖率与冬季动能密度通量呈正相关，表明一致的海洋涌入最有可能通过增加颗粒输送速率来增加150 m以上的生物量。我们的发现表明，峡湾墙支持高生物量，高功能，多样化和广阔的生物系统，在制定沿海海洋管理计划时，有必要进行进一步的研究和考虑。

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