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Climate-Driven Range Shifts of Brown Seaweed Sargassum horneri in the Northwest Pacific
Frontiers in Marine Science ( IF 3.7 ) Pub Date : 2020-09-02 , DOI: 10.3389/fmars.2020.570881
Jing-Jing Li , Sheng-Hui Huang , Zheng-Yi Liu , Yuan-Xin Bi

Climate-driven shifts of coastal species’ ranges constitute a key factor shaping both the vegetation composition and biodiversity of coastal ecosystems. Although phylogeographic studies relying on genetic data have shed light on the evolutionary history of macroalgae along the Northwest Pacific (NW-Pacific) coast, their distribution dynamics are less understood and require interdisciplinary examination. Here, we used a combination of species distribution models (SDMs) and genetic data to explain the causes of population persistence and genetic differentiation and their consequences for the brown seaweed Sargassum horneri in the NW-Pacific. In this region, the phylogeographic structure of S. horneri was analyzed by screening 72 populations spawning across the entire coastal distribution and obtaining their mtDNA cox3 data. Population genetic structure and SDMs based on paleoclimatic data consistently revealed that southern coasts of the Sea of Japan, North-Pacific-Japan, and the northern part of Okinawa Trough might have served as potential refugia for S. horneri during the Last Glacial Maximum (LGM). Furthermore, we projected the distribution dynamics of S. horneri under future climate scenarios. The range of S. horneri was predicted to move northward, with a significant loss of suitable habitat, under the high emissions scenario (RCP 8.5). By contrast, projected range shifts were minimal under the low emissions scenario (RCP 2.6). Furthermore, North-Pacific-Japan was projected to be long-term persistence habitat for S. horneri under future climatic conditions, thus including this area in conservation planning could help mitigate for climate change implications. Our results enable a better understanding of the impacts of climate change on the spatio-temporal distribution of macroalgae and how this can inform coastal management and marine conservation planning.

中文翻译:

西北太平洋褐海藻马尾藻的气候驱动范围变化

气候驱动的沿海物种分布范围的变化构成了塑造沿海生态系统植被组成和生物多样性的关键因素。尽管依赖遗传数据的系统地理学研究揭示了西北太平洋 (NW-Pacific) 沿岸大型藻类的进化历史,但它们的分布动态知之甚少,需要跨学科研究。在这里,我们使用物种分布模型 (SDM) 和遗传数据的组合来解释种群持久性和遗传分化的原因及其对西北太平洋棕色海藻 Sargassum horneri 的影响。在该地区,通过筛选在整个沿海分布区产卵的 72 个种群并获得它们的 mtDNA cox3 数据来分析 S. horneri 的系统地理学结构。基于古气候数据的种群遗传结构和 SDM 一致表明,日本海南部海岸、北太平洋-日本和冲绳海槽北部可能在末次盛冰期 (LGM) 期间成为 S. horneri 的潜在避难所)。此外,我们预测了未来气候情景下 S. horneri 的分布动态。在高排放情景 (RCP 8.5) 下,预计 S. horneri 的范围将向北移动,合适的栖息地将显着丧失。相比之下,在低排放情景(RCP 2.6)下,预计的范围变化很​​小。此外,预计在未来的气候条件下,北太平洋-日本将成为 S. horneri 的长期持久栖息地,因此将这一地区纳入保护规划有助于减轻气候变化的影响。
更新日期:2020-09-02
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