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.

伊比利亚半岛北部和西北海岸大型藻类的分布正处于变化时期，在此期间，大多数冷温带物种的覆盖面积减少，其他物种消失。另一方面，其他物种的数量却有所增加。这些变化可能与气候变化引起的决定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采样方法。分析了潮间带大型藻类物种的覆盖度与非生物变量（海面温度、气温和有效波高）之间的关系，以检测历史数据可能发生变化。结果表明，比斯开湾内陆地区的群落发生了变化，主要与水温和气温的升高有关。每个海藻类群（暖温带、冷温带、机会性和外来物种）都表现出不同的修饰模式。珊瑚藻、 Bifurcaria bifurcata和Cystoseira baccata有所增加，这可能与变暖趋势有关。外来物种Asparagopsis armata也有所增加，特别是在下里亚斯地区。另一方面，寒温带物种喜曼塔利亚（Himanthalia elongata）的数量急剧减少。获得的数据支持该特定区域气候变化背景下大型藻类群落与环境的关系。