温度和盐度对大洋Gephyrocapsa oceanica (Isochrysidales,球石藻科)DMSP产量的影响

IF 1.5 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY
S. Larsen, J. Beardall
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引用次数: 0

摘要

摘要在10 ~ 30℃和20‰~ 45‰的温度和盐度范围内,培养了一种亚热带海洋巨藻(Gephyrocapsa oceanica)。细胞DMSP随着盐度的增加而增加,这与DMSP是相容渗透物的假设相一致。细胞DMSP含量在低温下最高,随温度升高而降低。净DMSP产率也与细胞大小有关,在低于该无性系最适生长温度20℃的2℃左右生长速率最大。这导致净DMSP产量对温度升高的单峰响应:当细胞在低于最佳生长温度的条件下生长时,净DMSP产量随温度升高而增加。在最佳生长温度及以上,进一步升温会降低DMSP的净产量。仅就温度的影响而言,在亚热带海洋中,洋螺的生长达到或超过其最佳水平,由于气候变化而进一步变暖将导致DMSP净产量减少,因此DMS向大气的通量和硫酸盐气溶胶产量可能会减少。由于这些气溶胶调节云的反照率和寿命,那么它们也会减少,导致温度的正反馈响应。相反的效应可能发生在生长温度低于最佳温度的高纬度海洋中。这两个地区的确切响应是复杂的,因为变暖还将加强水柱分层,并可能减少混合层深度,从而影响营养物和光照制度,以及可能的物种演取效应。需要进一步的工作来研究这些其他的间接温度效应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The effect of temperature and salinity on DMSP production in Gephyrocapsa oceanica (Isochrysidales, Coccolithophyceae)
ABSTRACT A subtropical clone of Gephyrocapsa oceanica was grown over the temperature and salinity range 10–30°C and 20‰–45‰ respectively. Cellular DMSP increased with increasing salinity, compatible with the hypothesis that DMSP is a compatible osmolyte. Cellular DMSP content was highest at colder temperatures and decreased as temperature increased. Net DMSP production rate also depended on cell size and growth rate was greatest about 2°C below the optimum growth temperature of 20°C for this clone. This resulted in a unimodal response of net DMSP production to increasing temperature: net DMSP production increased with increasing temperature when the cells were growing at temperatures below optimum for growth. At and above optimum growth temperature, further warming decreased net DMSP production. For the effect of temperature alone, in the subtropical oceans, where G. oceanica is growing at or above its optimum, further warming due to climate change will result in decreased net DMSP production and so a probable decrease in the flux of DMS to the atmosphere and sulphate aerosol production. Inasmuch as these aerosols modulate cloud albedo and longevity then these too will both decrease, resulting in a positive feedback response for temperature. The reverse effect may occur in higher latitude oceans where growth temperature is below optimum. The exact response in both regions is complicated because warming will also enhance water column stratification and may reduce mixed layer depths, affecting both nutrient and light regimes, as well as possible species succession effects. Further work is required to investigate these other indirect temperature effects.
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来源期刊
Phycologia
Phycologia 生物-海洋与淡水生物学
CiteScore
3.10
自引率
18.80%
发文量
54
审稿时长
3 months
期刊介绍: Phycologia is published bimonthly by the International Phycological Society and serves as a publishing medium for information about any aspect of phycology. Membership in the Society is not necessary for publication. Submitted manuscripts cannot be previously published or submitted elsewhere. Copyright ownership of all accepted papers is held by the International Phycological Society.
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