Marbà Núria, Krause-Jensen Dorte, Olesen Birgit, Christensen Peter B, Merzouk Anissa, Rodrigues Joao, Wegeberg Susse, Wilce Robert T
Department of Global Change Research, IMEDEA (CSIC-UIB), Miquel Marquès 21, 07190, Esporles (Illes Balears), Spain.
Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600, Silkeborg, Denmark.
Ambio. 2017 Feb;46(Suppl 1):119-131. doi: 10.1007/s13280-016-0873-7.
Ascophyllum nodosum is a foundation macroalgae of the intertidal zone that distributes across latitude 41.3-69.7°N. We tested the hypothesis that growth of A. nodosum near the northern distribution edge increases with warming. We retrospectively quantified the growth of eight A. nodosum populations at West Greenland and North Norway (from 64°N to 69°N). For seven populations, we measured growth rates since 1997-2002 and for one of them we extended the time series back to 1956 using published estimates. Individuals at northern populations elongated between 2.0 and 9.1 cm year and this variability correlated with temperature and annual ice-free days. A spatial comparison of A. nodosum growth across the species distribution range showed that Northern (and coldest) populations grew at the slowest rates. Our results demonstrate that arctic climate change enhances the growth of A. nodosum populations and suggest that their productivity may increase in response to projected global warming.
墨角藻是潮间带的一种基础大型藻类，分布于北纬41.3 - 69.7°之间。我们检验了这样一个假设：在其分布北缘附近，墨角藻的生长会随着气候变暖而加快。我们回顾性地量化了西格陵兰岛和挪威北部（北纬64°至69°）8个墨角藻种群的生长情况。对于其中7个种群，我们测量了自1997 - 2002年以来的生长速率，对于其中一个种群，我们利用已发表的估计数据将时间序列追溯至1956年。北部种群的个体每年伸长2.0至9.1厘米，这种变异性与温度和年度无冰天数相关。对墨角藻在整个物种分布范围内生长情况的空间比较表明，北部（也是最冷的）种群生长速率最慢。我们的结果表明，北极气候变化会促进墨角藻种群的生长，并表明它们的生产力可能会因预计的全球变暖而提高。
