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Looks can be deceiving: contrasting temperature characteristics of two morphologically similar kelp species co-occurring in the Arctic
Botanica Marina ( IF 2.2 ) Pub Date : 2021-06-01 , DOI: 10.1515/bot-2021-0014
Kiara Franke 1, 2 , Daniel Liesner 1, 3 , Svenja Heesch 2 , Inka Bartsch 1
Affiliation  

Two morphologically similar digitate kelp species, Laminaria digitata and Hedophyllum nigripes , co-occur along a shallow sublittoral depth gradient in the Arctic but, in contrast to L. digitata , very few ecophysiological data exist for H. nigripes . We investigated growth, survival, photosynthetic characteristics and carbon:nitrogen ratios of juvenile sporophytes, and recruitment and survival of gametophytes in genetically verified Arctic isolates of both species along temperature gradients (0–25 °C) over 14 days. Laminaria digitata gametophytes survived 23–24 °C, while sporophytes survived 21–22 °C. Hedophyllum nigripes had lower temperature affinities. Gametophytes survived 19–21 °C, while sporophytes survived 18 °C. Male gametophytes were more heat-tolerant than female gametophytes in both species. The pronounced cold adaption of H. nigripes compared to L. digitata also became apparent in different sporophyte growth optima ( L. digitata : 15 °C; H. nigripes : 10 °C) and gametogenesis optima ( L. digitata : 5–15 °C; H. nigripes : 0–10 °C). Higher carbon:nitrogen ratios in H. nigripes suggest an adaptation to nutrient poor Arctic conditions. The overall temperature performance of H. nigripes possibly restricts the species to Arctic–Sub-Arctic regions, while Arctic L. digitata behaved similarly to cold-temperate populations. Our data suggest that a future increase in seawater temperatures may hamper the success of H. nigripes and favour L. digitata in Arctic environments.

中文翻译:

外表可能具有欺骗性:在北极共同出现的两种形态相似的海带物种的对比温度特征

两种形态相似的指状海带物种,Laminaria digitata 和 Hedophyllum nigripes,沿着北极浅浅的沿海深度梯度共同出现,但与 L. digitata 相比,H. nigripes 的生态生理数据很少。我们研究了 14 天内,两个物种的遗传验证的北极分离株中的幼年孢子体的生长、存活、光合特性和碳氮比,以及配子体的募集和存活情况(0-25°C)。海带指配子体在 23-24°C 下存活,而孢子体在 21-22°C 下存活。Hedophyllum nigripes 具有较低的温度亲和力。配子体在 19-21°C 下存活,而孢子体在 18°C 下存活。在这两个物种中,雄配子体比雌配子体更耐热。H的明显冷适应。与 L. digitata 相比,nigripes 在不同孢子体生长最适(L. digitata:15 °C;H. nigripes:10 °C)和配子发生最适(L. digitata:5-15 °C;H. nigripes:0 –10 °C)。H. nigripes 中较高的碳:氮比表明对营养贫乏的北极条件的适应。H. nigripes 的整体温度表现可能将该物种限制在北极-亚北极地区,而北极 L. digitata 的行为与寒温带种群相似。我们的数据表明,未来海水温度的升高可能会阻碍 H. nigripes 的成功,并有利于北极环境中的 L. digitata。H. nigripes 中较高的碳:氮比表明对营养贫乏的北极条件的适应。H. nigripes 的整体温度表现可能将该物种限制在北极-亚北极地区,而北极 L. digitata 的行为与寒温带种群相似。我们的数据表明,未来海水温度的升高可能会阻碍 H. nigripes 的成功,并有利于北极环境中的 L. digitata。H. nigripes 中较高的碳:氮比表明对营养贫乏的北极条件的适应。H. nigripes 的整体温度表现可能将该物种限制在北极-亚北极地区,而北极 L. digitata 的行为与寒温带种群相似。我们的数据表明,未来海水温度的升高可能会阻碍 H. nigripes 的成功,并有利于北极环境中的 L. digitata。
更新日期:2021-06-07
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