Temperature-induced copepod depletion and the associated wax of Bellerochea in Belgian coastal waters: Implications and shifts in plankton dynamics

IF 2.1 4区 地球科学 Q2 MARINE & FRESHWATER BIOLOGY
Jonas Mortelmans , Ilias Semmouri , Michiel Perneel , Rune Lagaisse , Luz Amadei Martínez , Zoe Rommelaere , Pascal I. Hablützel , Klaas Deneudt
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Abstract

Since 2018, severe and recurrent copepod depletions have been observed in Belgian coastal waters. These depletions have been described as temperature-induced mass mortality events. This paper confirms the relation of copepod abundance anomalies with periods of high temperature based on new data. Although severe, the effects, consequences and implications of this depletion remain unknown. Our study suggests that the absence of zooplanktonic predators in autumn, together with the availability of nutrients discharged via the Scheldt estuary, allowed a bloom of the diatom Bellerochea, in a season otherwise characterised by low phytoplanktonic activity. Although the bloom reaches high abundances, its effects on the marine environment are not yet visible. The enormous abundances are likely to induce small-scale oxygen depletions which might further translate to the environment. Communities of Calanoida, Canuelloida and Cyclopoida tend to recover from the annual autumn depletion, although the typical autumn peak is entirely missing in the years subject to severe heat waves and associated high water temperatures. As a result, copepod dynamics have drastically changed since the first observed depletion and associated bloom of Bellerochea in 2018.

温度引起的比利时沿海水域桡足类枯竭和相关的 Bellerochea 蜡:浮游生物动态的影响和变化
自 2018 年以来,在比利时沿海水域观察到了严重且反复出现的桡足类枯竭现象。这些减少被描述为温度诱发的大规模死亡事件。本文根据新数据证实了桡足类丰度异常与高温期的关系。尽管情况严重,但这种枯竭的影响、后果和意义仍然未知。我们的研究表明,秋季浮游动物捕食者的缺失,再加上斯海尔德河口排放的营养物质,使得硅藻 Bellerochea 在浮游植物活动较少的季节大量繁殖。虽然硅藻大量繁殖,但其对海洋环境的影响尚不明显。巨大的丰度很可能会导致小规模的氧气耗竭,从而进一步影响环境。桡足类、桡足类和环足类群落往往会从每年秋季的耗竭中恢复过来,但在遭受严重热浪和相关高水温的年份,典型的秋季高峰会完全消失。因此,自 2018 年首次观测到 Bellerochea 的枯竭和相关水华以来,桡足类的动态发生了巨大变化。
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来源期刊
Journal of Sea Research
Journal of Sea Research 地学-海洋学
CiteScore
3.20
自引率
5.00%
发文量
86
审稿时长
6-12 weeks
期刊介绍: The Journal of Sea Research is an international and multidisciplinary periodical on marine research, with an emphasis on the functioning of marine ecosystems in coastal and shelf seas, including intertidal, estuarine and brackish environments. As several subdisciplines add to this aim, manuscripts are welcome from the fields of marine biology, marine chemistry, marine sedimentology and physical oceanography, provided they add to the understanding of ecosystem processes.
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