Drivers of Marine Phytoplankton Diversity and Connectivity in the Galápagos Archipelago Spanning an ENSO Cycle

IF 4.3 2区 生物学 Q2 MICROBIOLOGY
Prisca Lim, Harvey Seim, Oliva Torano, Erika Neave, Se Hyeon Jang, Zackary Johnson, Sara Haines, Scott Gifford, Natalie Cohen, Carly M. Moreno, Margarita Lankford, Cristina Vintimilla Palacios, Adrian Marchetti
{"title":"Drivers of Marine Phytoplankton Diversity and Connectivity in the Galápagos Archipelago Spanning an ENSO Cycle","authors":"Prisca Lim,&nbsp;Harvey Seim,&nbsp;Oliva Torano,&nbsp;Erika Neave,&nbsp;Se Hyeon Jang,&nbsp;Zackary Johnson,&nbsp;Sara Haines,&nbsp;Scott Gifford,&nbsp;Natalie Cohen,&nbsp;Carly M. Moreno,&nbsp;Margarita Lankford,&nbsp;Cristina Vintimilla Palacios,&nbsp;Adrian Marchetti","doi":"10.1111/1462-2920.70146","DOIUrl":null,"url":null,"abstract":"<div>\n \n <p>The Galápagos Islands are a biodiversity hotspot, largely due to the Equatorial Undercurrent (EUC) which supplies nutrient-rich waters to the euphotic zone and supports enhanced levels of primary productivity performed by phytoplankton. Understanding phytoplankton responses to changing environmental conditions is crucial for regional conservation and management efforts. Research cruises conducted between 2014 and 2022, spanning a major El Niño event in 2015 and a La Niña event in 2022, observed varying oceanic conditions and diverse phytoplankton community composition. At most EUC-influenced stations, larger-sized phytoplankton groups (≥ 5 μm) were dominant while warmer, oligotrophic sites favoured smaller-sized phytoplankton groups (&lt; 5 μm). Predictably, nutrient supply was suppressed during the El Niño event associated with the weakening of the EUC and deepening of the thermocline. Counterintuitively, nutrient levels were not significantly enhanced during the La Niña event likely because increased stratification between the mixed and deep water layers reduced entrainment, particularly at Eastern stations. Protist community composition was evaluated using 18S rRNA gene metabarcoding; the majority of detected OTUs were associated with upwelling conditions prevalent around the archipelago. Taxonomic variability reflected heterogeneous environmental conditions generated by the convergence of multiple ocean currents. These results highlight the dynamic interplay of physical and biological factors shaping primary productivity in the Galápagos marine ecosystem.</p>\n </div>","PeriodicalId":11898,"journal":{"name":"Environmental microbiology","volume":"27 7","pages":""},"PeriodicalIF":4.3000,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental microbiology","FirstCategoryId":"99","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/1462-2920.70146","RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MICROBIOLOGY","Score":null,"Total":0}
引用次数: 0

Abstract

The Galápagos Islands are a biodiversity hotspot, largely due to the Equatorial Undercurrent (EUC) which supplies nutrient-rich waters to the euphotic zone and supports enhanced levels of primary productivity performed by phytoplankton. Understanding phytoplankton responses to changing environmental conditions is crucial for regional conservation and management efforts. Research cruises conducted between 2014 and 2022, spanning a major El Niño event in 2015 and a La Niña event in 2022, observed varying oceanic conditions and diverse phytoplankton community composition. At most EUC-influenced stations, larger-sized phytoplankton groups (≥ 5 μm) were dominant while warmer, oligotrophic sites favoured smaller-sized phytoplankton groups (< 5 μm). Predictably, nutrient supply was suppressed during the El Niño event associated with the weakening of the EUC and deepening of the thermocline. Counterintuitively, nutrient levels were not significantly enhanced during the La Niña event likely because increased stratification between the mixed and deep water layers reduced entrainment, particularly at Eastern stations. Protist community composition was evaluated using 18S rRNA gene metabarcoding; the majority of detected OTUs were associated with upwelling conditions prevalent around the archipelago. Taxonomic variability reflected heterogeneous environmental conditions generated by the convergence of multiple ocean currents. These results highlight the dynamic interplay of physical and biological factors shaping primary productivity in the Galápagos marine ecosystem.

Abstract Image

横跨ENSO循环的Galápagos群岛海洋浮游植物多样性和连通性的驱动因素
Galápagos群岛是一个生物多样性的热点,主要是由于赤道暗流(EUC),它提供营养丰富的水到光区,并支持浮游植物的初级生产力水平的提高。了解浮游植物对变化的环境条件的反应对区域保护和管理工作至关重要。2014年至2022年期间进行的研究巡航,跨越了2015年的一次主要El Niño事件和2022年的La Niña事件,观察到不同的海洋条件和不同的浮游植物群落组成。在大多数受eucc影响的站点,大型浮游植物群(≥5 μm)占主导地位,而温暖的寡营养站点则倾向于小型浮游植物群(< 5 μm)。可以预见的是,在El Niño事件期间,与EUC减弱和温跃层加深有关的营养供应受到抑制。与直觉相反,La Niña事件期间营养水平没有显著提高,可能是因为混合层和深水层之间的分层增加减少了夹带,特别是在东部站。采用18S rRNA基因元条形码分析原生生物群落组成;大多数检测到的otu与群岛周围普遍存在的上升流条件有关。分类学上的变异反映了多种洋流汇聚所产生的异质环境条件。这些结果突出了形成Galápagos海洋生态系统初级生产力的物理和生物因素的动态相互作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Environmental microbiology
Environmental microbiology 环境科学-微生物学
CiteScore
9.90
自引率
3.90%
发文量
427
审稿时长
2.3 months
期刊介绍: Environmental Microbiology provides a high profile vehicle for publication of the most innovative, original and rigorous research in the field. The scope of the Journal encompasses the diversity of current research on microbial processes in the environment, microbial communities, interactions and evolution and includes, but is not limited to, the following: the structure, activities and communal behaviour of microbial communities microbial community genetics and evolutionary processes microbial symbioses, microbial interactions and interactions with plants, animals and abiotic factors microbes in the tree of life, microbial diversification and evolution population biology and clonal structure microbial metabolic and structural diversity microbial physiology, growth and survival microbes and surfaces, adhesion and biofouling responses to environmental signals and stress factors modelling and theory development pollution microbiology extremophiles and life in extreme and unusual little-explored habitats element cycles and biogeochemical processes, primary and secondary production microbes in a changing world, microbially-influenced global changes evolution and diversity of archaeal and bacterial viruses new technological developments in microbial ecology and evolution, in particular for the study of activities of microbial communities, non-culturable microorganisms and emerging pathogens
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信