浮游植物是全球变暖的指示器?

IF 5.1 2区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Letters Pub Date : 2023-09-08 DOI:10.1002/lol2.10354
James E. Cloern, Tara S. Schraga, Erica Nejad, Taylor Eddy
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引用次数: 0

摘要

陆地植物是全球变暖的敏感指标,因为它们的年度生长和衰老周期随着变暖的进行而变化。单细胞藻类是一种独特的生命形式,在任何季节都能爆发种群,因此浮游植物的酚学作为全球变暖的可比指标存在不确定性。我们分析了旧金山湾两个地点4年以上的月度叶绿素a测量结果,发现夏季月份的突变导致一个地点叶绿素a积累的年度模式提前48天,另一个地点延迟36天。这些大的酚类变化与温度变化无关,但它们与双壳类滤食性动物自上而下控制的变化有关,因为生物群落通过(1)引入非本地蛤蜊和(2)东北太平洋大气强迫的变化而重组。这项研究表明,浮游植物表型的变化不一定是对全球变暖的反应或指标。然而,它们可以是人类干扰和自然气候振荡的指标,其影响足以掩盖气候变暖的影响。
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Phytoplankton as indicators of global warming?

Terrestrial plants are sensitive indicators of global warming because their annual cycles of growth and senescence are changing as warming proceeds. Single celled algae are distinct life forms capable of population bursts in any season, so there is uncertainty about phytoplankton phenology as a comparable indicator of global warming. We analyzed 4+ decades of monthly chlorophyll a measurements at two sites in San Francisco Bay and found abrupt shifts during summer months leading to a 48-day advance in the annual pattern of chlorophyll-a accumulation at one site and a 36-day delay at the other. These large phenological changes were not associated with changing temperature, but they were associated with changes in top–down control by bivalve filter feeders as biological communities were restructured by (1) introduction of a non-native clam, and (2) a shift in atmospheric forcing of the NE Pacific. This study illustrates that changes in phytoplankton phenology are not necessarily responses to or indicators of global warming. However, they can be indicators of human disturbances and natural climate oscillations having effects large enough to mask the effect of climate warming.

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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
期刊介绍: Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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