Effects of temperature and nutrients on microscopic stages of the bull kelp (Nereocystis luetkeana, Phaeophyceae)
Effects of temperature and nutrients on microscopic stages of the bull kelp (Nereocystis luetkeana, Phaeophyceae)
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温度和营养物质对海带（Nereocystis luetkeana，褐藻纲）微观阶段的影响
DOI：
10.1111/jpy.13366
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发表时间：
2023
影响因子：
2.9
通讯作者：
Dethier, Megan N.
中科院分区：
文献类型：
--
作者：
Weigel, Brooke L.;Small, Sadie L.;Berry, Helen D.;Dethier, Megan N.
海洋温度变暖与全球海带森林的减少有关，气温升高可以与其他当地压力因素协同作用，加剧海带的损失。公牛海带Nereocystis luetkeanae是萨利希海主要的冠层形成海带物种，在夏季水温升高和营养物质浓度低的地区，它正在下降。为了确定这两种胁迫对N. luetkeana微观阶段的相互作用，我们在七种不同温度（10-22°C）和两种氮浓度下培养了来自七个不同Salish海种群的配子体和微观孢子体。显微镜下的配子体和孢子体的耐热性在种群间是相似的，高温比低氮水平更紧张。额外的氮并没有提高高温下配子体或孢子体的存活率。配子体密度在10至16°C之间最高，在18°C时急剧下降，20和22°C的温度是致命的。成功产生孢子体的窗口较窄，在10-14°C时达到峰值。在所有种群中，产生孢子体的最高温度是16或18°C，但与较冷的温度相比，孢子体密度在16°C下低78%，在18°C下低95%。在野外，底部温度表明，夏季在多个地点达到了配子体生长（18°C）和孢子体生产（16-18°C）的温度极限。长时间暴露在16°C以上的温度下会限制巨藻配子体的繁殖，从而限制巨藻孢子体的补充。
Warming ocean temperatures have been linked to kelp forest declines worldwide, and elevated temperatures can act synergistically with other local stressors to exacerbate kelp loss. The bull kelpNereocystis luetkeanais the primary canopy‐forming kelp species in the Salish Sea, where it is declining in areas with elevated summer water temperatures and low nutrient concentrations. To determine the interactive effects of these two stressors on microscopic stages ofN. luetkeana, we cultured gametophytes and microscopic sporophytes from seven different Salish Sea populations across seven different temperatures (10–22°C) and two nitrogen concentrations. The thermal tolerance of microscopic gametophytes and sporophytes was similar across populations, and high temperatures were more stressful than low nitrogen levels. Additional nitrogen did not improve gametophyte or sporophyte survival at high temperatures. Gametophyte densities were highest between 10 and 16°C and declined sharply at 18°C, and temperatures of 20 and 22°C were lethal. The window for successful sporophyte production was narrower, peaking at 10–14°C. Across all populations, the warmest temperature at which sporophytes were produced was 16 or 18°C, but sporophyte densities were 78% lower at 16°C and 95% lower at 18°C compared to cooler temperatures. In the field, bottom temperatures revealed that the thermal limits of gametophyte growth (18°C) and sporophyte production (16–18°C) were reached during the summer at multiple sites. Prolonged exposure of bull kelp gametophytes to temperatures of 16°C and above could limit reproduction, and therefore recruitment, of adult kelp sporophytes.
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海带配子体（海带目、褐藻门）的温度耐受性和在黑暗中的生存：生态和生物地理学意义
影响因子：
2.5
作者：
I. Dieck
通讯作者：
I. Dieck
影响因子：
2.5
作者：
Mabin, Christopher J. T.;Gribben, Paul E.;Wright, Jeffrey T.
通讯作者：
Wright, Jeffrey T.
影响因子：
2.9
作者：
Dobkowski, Katie A.;Flanagan, K. Darby;Nordstrom, Jessica R.
通讯作者：
Nordstrom, Jessica R.
影响因子：
3.7
作者：
通讯作者：
--
影响因子：
--
作者：
D. Palacios;E. Hazen;I. Schroeder;S. Bograd
通讯作者：
D. Palacios;E. Hazen;I. Schroeder;S. Bograd