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首页> 外文期刊>Marine biology >Invading up the food web? Invasive fish in the southeastern Mediterranean Sea
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Invading up the food web? Invasive fish in the southeastern Mediterranean Sea

机译：入侵食物网？地中海东南部的入侵鱼类

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摘要

The invasion of Indo-Pacific fish through the Suez Canal has dramatically altered the diversity of fish assemblages on the upper shelf of the southeastern Mediterranean. Yet, their role in the trophodynamics of the novel assemblages has been largely overlooked. In the present study, we investigated the impacts of the alien fish species on the structure of the food web along the Israeli upper shelf soft bottoms, as expressed by their biomass relative abundance, and by comparing the mean and distribution patterns of the trophic levels among the aliens and the local native species. Our study, based on examination of more than 200,000 fishes belonging to 111 species, revealed that at 20-m alien species comprised 54 % of all sampled individuals while comprising 70 % of the biomass; at 40 the alien species comprised 67 % of all sampled individuals and 45 % of the biomass. Overall, the mean weighted trophic level of the aliens was 3.74, while that of the natives was 3.39. Depth was found as an important factor affecting the trophic levels of both native and alien species. At a depth of 20 m, the combined mean weighted trophic level (natives + aliens) was slightly higher than at 40 m (3.61 and 3.56, respectively), although depth impact differed between aliens and natives. Between a depth of 20 and 40 m, the mean weighted trophic level of aliens increased from 3.65 to 3.85, while that of the natives decreased from 3.54 to 3.33. These findings indicate that the local food webs have gone through significant modification, with a trend of increasing dominance of alien fish.
机译：苏伊士运河对印度洋太平洋鱼类的入侵极大地改变了东南地中海上层鱼类的种类。然而，它们在新型组合的营养动力学中的作用已被大大忽略。在本研究中，我们调查了外来鱼类物种对沿以色列上层架软底食物网结构的影响（以它们的生物量相对丰度表示），并比较了各营养层之间营养水平的平均值和分布方式外星人和当地的本地物种。我们的研究基于对属于111个物种的200,000多条鱼类的检查，结果表明，在20 m处，外来物种占所有采样个体的54％，而生物量却占70％。在40种外来物种中，外来物种占所有采样个体的67％，占生物量的45％。总体而言，外国人的平均加权营养水平为3.74，而土著人的平均营养水平为3.39。人们发现深度是影响本土和外来物种营养水平的重要因素。在深度为20 m时，尽管加权深度影响在外国人和当地人之间有所不同，但平均加权营养水平（当地人+外星人）略高于40 m（分别为3.61和3.56）。在20到40 m的深度之间，外星人的平均加权营养水平从3.65上升到3.85，而本地人的平均营养水平从3.54下降到3.33。这些发现表明，当地食物网已经过重大改造，外来鱼类的主导地位有增加的趋势。

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  • 来源
    《Marine biology》 |2016年第8期|180.1-180.11|共11页
  • 作者

    Goren Menachem; Galil Bella S.; Diamant Arik; Stern Nir; Levitt-Barmats Yaarit;

  • 作者单位

    Tel Aviv Univ, Dept Zool, IL-69978 Tel Aviv, Israel|Tel Aviv Univ, Steinhardt Museum Nat Hist, IL-69978 Tel Aviv, Israel;

    Israel Oceanog & Limnol Res, Natl Inst Oceanog, Haifa, Israel;

    Israel Oceanog & Limnol Res, Natl Ctr Mariculture, Elat, Israel;

    Tel Aviv Univ, Dept Zool, IL-69978 Tel Aviv, Israel|Tel Aviv Univ, Steinhardt Museum Nat Hist, IL-69978 Tel Aviv, Israel;

    Tel Aviv Univ, Dept Zool, IL-69978 Tel Aviv, Israel|Tel Aviv Univ, Steinhardt Museum Nat Hist, IL-69978 Tel Aviv, Israel;

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