Resolving abrupt frontal gradients in zooplankton community composition and marine snow fields with an autonomous Zooglider

IF 3.8 1区 地球科学 Q1 LIMNOLOGY
Sven Gastauer, Mark D. Ohman
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引用次数: 0

Abstract

An autonomous Zooglider navigated across the California Current Front into low salinity, minty waters characteristic of the California Current proper in both summers of 2019 and 2021. Diving to 400 m depth, Zooglider transited another near‐surface frontal gradient somewhat inshore. These frontal gradients were generally associated with changes in intensity, size composition, and Diel Vertical Migration responses of acoustic backscatterers. They were also associated with pronounced changes in zooplankton community composition, as assessed by a shadowgraph imaging Zoocam. Zoocam detected a decline in concentrations of copepods, appendicularians, and marine snow in the offshore direction, and an overall shift in community structure to a higher proportion of carnivorous taxa (and, in 2019, of planktonic rhizaria). No taxon was consistently elevated at all the peak frontal gradients, but appendicularians, copepods, and rhizarians sometimes showed front‐related increases in concentration. Such frontal gradient regions represent relatively abrupt transitions to different communities of planktonic organisms and suspended marine snow particles, with consequences for predator–prey relationships and the dominant vectors of particle export into subsurface waters.
利用自主式 Zooglider 解决浮游动物群落组成和海洋雪场的突变锋面梯度问题
在 2019 年和 2021 年的夏天,自动驾驶的 Zooglider 穿过加州洋流前沿,进入加州洋流本体特有的低盐度薄荷水域。下潜至 400 米深处后,Zooglider 又穿过了近岸的另一个近水面锋面梯度。这些锋面梯度通常与声学背散射体的强度、大小组成和昼夜垂直迁移反应的变化有关。根据影图成像 Zoocam 的评估,它们还与浮游动物群落组成的明显变化有关。Zoocam 发现,桡足类、附肢类和海雪的浓度在近海方向有所下降,群落结构总体上向肉食性类群(以及在 2019 年,浮游根瘤类)比例较高的方向转变。在所有的锋面梯度峰值上,没有任何分类群的浓度持续升高,但附肢动物、桡足类和根瘤类的浓度有时会出现与锋面相关的升高。这种锋面梯度区域代表了浮游生物和悬浮海雪颗粒向不同群落的相对突然过渡,对捕食者与被捕食者之间的关系以及颗粒向表层下水域输出的主要载体产生了影响。
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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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