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Changes in the distribution of intertidal macroalgae along a longitudinal gradient in the northern coast of Spain

机译:西班牙北部海岸潮间带大型藻类分布沿纵向梯度的变化

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The distribution of macroalgal species along the north and northwest coast of the Iberian Peninsula is in a period of change, during which mostly cold-temperate species have decreased in cover and others have disappeared. On the other hand, other species have increased in abundance. These shifts could be related with the modification of environmental factors that determine species distribution caused by climate change. A standardised sampling methodology was applied at 18 sites along the north coast of Spain in 2011 and 2017. The relationship between the coverage of intertidal macroalgal species and abiotic variables (sea surface temperature, air temperature and significant wave height) was analysed in order to detect possible changes in the historical data. Results suggest a modification in the communities in the inner part of the Bay of Biscay, mostly related to an increase in water and air temperature. Each seaweed group (warm-temperate, cold-temperate, opportunistic and exotic species) showed a different pattern of modification. Coralline algae, Bifurcaria bifurcata and Cystoseira baccata have increased, which may be related to the warming trend. The exotic species Asparagopsis armata has also increased, particularly in the Lower Rias. On the other hand, there was a drastic decrease of the cold-temperate species Himanthalia elongata. Data obtained support the relationship of macroalgae species communities and environment in the context of climate change in this particular area.
机译:伊比利亚半岛北部和西北沿海大型藻类物种的分布处于变化时期,在此期间,大多数冷温物种的覆盖率下降,而其他物种则消失了。另一方面,其他物种的数量也增加了。这些变化可能与确定由气候变化引起的物种分布的环境因素的改变有关。 2011年和2017年在西班牙北海岸的18个地点采用了标准化的采样方法。分析了潮间带大型藻类物种的覆盖范围与非生物变量(海面温度,气温和重要波高)之间的关系,以便进行检测。历史数据可能发生的变化。结果表明,比斯开湾内部的群落发生了变化,主要与水和气温的升高有关。每个海藻类(温带,冷带,机会性和外来物种)显示出不同的修饰方式。珊瑚藻,双歧双歧杆菌和半胱蓝藻有所增加,这可能与变暖趋势有关。外来物种天冬草也增加了,特别是在下里亚斯。另一方面,冷温种Himanthalia elongata急剧减少。在该特定区域的气候变化背景下,获得的数据支持了大型藻类物种群落与环境之间的关系。

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