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首页> 外文期刊>Marine biology >Changes in ecosystem engineers: the effects of kelp forest type on currents and benthic assemblages in Kachemak Bay, Alaska
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Changes in ecosystem engineers: the effects of kelp forest type on currents and benthic assemblages in Kachemak Bay, Alaska

机译：生态系统工程师的变化：海带森林类型对阿拉斯加卡彻马克湾的洋流和底栖生物的影响

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摘要

In many temperate, rocky-reef coastal ecosystems, kelp forests modify alongshore currents, impact invertebrate settlement, and regulate understory algal abundances. Along the southern coasts of Alaska, in particular, two species of canopy-forming kelps with dissimilar morphologies, Nereocystis luetkeana and Eualaria fistulosa, co-occur but vary in their distributions and patterns of abundance, with one species often replacing the other at given sites in subsequent years. As a result, their differences in morphology may affect patterns of current flow through the forests, which could have strong impacts on invertebrate settlement and benthic diversity, particularly in Kachemak Bay, Alaska (59 degrees 36'33 '' N, 151 degrees 20'51 '' W), which experiences large tidal fluctuations resulting in strong alongshore currents. In this study, significant differences in current reductions were observed between the two kelp forest types within Kachemak Bay, but these reductions were small compared to the natural spatiotemporal variability of currents within the bay, and they were primarily limited to the upper few meters of the water column where the two species exhibit their greatest differences in morphology. Consequently, invertebrate settlement and abundance differed between the two kelp forest types as well as among study sites within the bay. In addition, there were differences observed in the composition and abundance of understory algae between the two forest types, which were presumably due to differences in shading abilities of the dominant kelps. Together, our results suggest that future changes in the distribution and abundances of these two kelp forest types may result in corresponding changes in hydrodynamic conditions within the forests, and thereby impact invertebrate and benthic algal assemblages.
机译：在许多温带岩石礁沿海生态系统中，海带森林会改变沿海水流，影响无脊椎动物的栖息地，并调节林下藻类的丰度。尤其是在阿拉斯加南部海岸，同时出现了两种形态不同的冠层海带，即Nereocystis luetkeana和Eualaria fistulosa，但它们的分布和丰度模式各不相同，其中一种在特定地点经常替代另一种在随后的几年中。结果，它们的形态差异可能会影响流过森林的电流模式，这可能会对无脊椎动物的栖息地和底栖生物多样性产生重大影响，特别是在阿拉斯加的Kachemak湾（59度36'33''北，151度20' 51英寸W），潮汐波动大，导致近岸海流强烈。在这项研究中，在Kachemak湾内的两种海带森林之间观察到了电流减少的显着差异，但与湾内洋流的自然时空变化相比，这些减少很小，并且主要限于沙丘上游的几米这两种物种在水柱上表现出最大的形态差异。因此，两种海带森林类型以及海湾内的研究地点之间的无脊椎动物沉降和丰度都不同。此外，两种森林类型之间的林下藻的组成和丰度也存在差异，这可能是由于优势海带的遮荫能力不同所致。总之，我们的结果表明，这两种海带森林类型的分布和丰度的未来变化可能会导致森林内水动力条件的相应变化，从而影响无脊椎动物和底栖藻类的组合。

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  • 来源
    《Marine biology》 |2017年第4期|81.1-81.12|共12页
  • 作者

    Hondolero Dominic; Edwards Matthew S.;

  • 作者单位

    NOAA, Kasitsna Bay Lab, NOS, CCFHR, Seldovia, AK 99663 USA;

    San Diego State Univ, Dept Biol, San Diego, CA 92182 USA;

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