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首页> 外文期刊>Estuarine Coastal and Shelf Science >Phytoplankton community dynamics in a coastal bay under upwelling influence (Central Chile)
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Phytoplankton community dynamics in a coastal bay under upwelling influence (Central Chile)

机译：沿海湾的浮游植物群落动态（智利中部）

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摘要

Marine coastal areas have high social-economic relevance and ensuring the good quality of these areas has gained importance in the past decades due to the increase of anthropogenic pressures. Understanding the dynamics of these areas is crucial to support management decisions. In this context, phytoplankton communities are generally used as key indicators of environmental quality as they respond in short time-scales and are at the base of food webs. This work intends to improve our understanding on how phytoplankton communities respond to environmental conditions, particularly in upwelling areas. Seawater samples were collected from Algarrobo Bay, Central Chile, for both phytoplankton pigments and microscopy analysis. Data were analyzed in combination with physico-chemical parameters and two distinct hydrographic regions were identified for the study area: i) a region occupying most of the northern bay section, characterized by lower temperatures and dissolved oxygen (DO), higher concentration of nutrients and higher N:P, where a mixed community with diatoms, chrysophytes, cryptophytes, haptophytes and other small flagellates were observed; and ii) a central-southern section, with higher temperatures and DO, lower nutrients and lower N:P, where diatoms, in particular the centric diatom Chaetoceros Ehrenberg, 1844 sp. (similar to 92.5% on average), dominated the phytoplankton assemblage. Other common but much less abundant diatom genus included Skeletonema Greville, 1865, Eucampia Ehrenberg, 1839, Dactyliosolen Castracane, 1886, Nitzschia Hassall, 1845, Cylindrotheca Rabenhorst, 1859 and Asterionellopsis Round, 1990. Apart from diatoms, the most abundant taxa belonged to flagellates, mainly chrysophytes (228.4 x 10(3) cells L-1 on average) and cryptophytes (213 x 10(3) cells L-1 on average). Overall, results suggest that the southern part of the Algarmbo Bay, with higher residence times and nutrient discharges, may act as an upwelling shadow area, where phytoplankton species can accumulate.
机译：海洋沿海地区具有高社会经济相关性，并确保由于人为压力的增加，过去数十年来，这些地区的优质质量得到了重要性。了解这些领域的动态至关重要，以支持管理决策。在这种情况下，浮游植物群落通常用作环境质量的关键指标，因为它们在短时间尺度上响应并且在食品网的基础上。这项工作旨在改善我们对Phytoplankton社区如何应对环境条件的理解，特别是在上升区。海水样本从智利中部Alganrobo Bay收集，用于浮游植物颜料和显微镜分析。与物理化学参数的组合分析数据，并确定了研究面积的两个不同的水文区域：i）占据大多数北部海湾部分的区域，其特征在于较低的温度和溶解氧（DO），营养浓度较高的营养素和浓度较高的N：P，其中观察到具有硅藻，菊芋，加密体，触觉和其他小鞭毛的混合群体;和II）一个核心南部，温度较高，营养成分和较低的N：P，其中硅藻，特别是以中心硅藻曲霉素Ehrenberg，1844 sp。 （平均相似的92.5％），以浮游植物组装为主。其他常见但不那么丰富的硅藻属包括骨质肿大的Greville，1865年，eucampia ehrenberg，1839，Daytylosolen Castracane，1886，Nitzschia Hassall，1845，Cylindrotheca Rabenhorst，1859，Asterionellopsis圆，1990.除了硅藻，最丰富的分类，属于鞭毛，主要是卷曲物质（平均为228.4×10（3）个细胞L-1）和加密（213×10（3）细胞L-1平均）。总体而言，结果表明，藻类湾的南部，具有较高的停留时间和营养排放，可以充当植物的阴影区域，其中浮游植物物种可以积聚。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2020年第30期|106968.1-106968.15|共15页
  • 作者

    Ferreira A.; Sa C.; Silva N.; Beltran C.; Dias A. M.; Brito A. C.;

  • 作者单位

    Univ Lisbon Fac Ciencias MARE Ctr Ciencias Mar & Ambiente P-1749016 Lisbon Portugal;

    Univ Lisbon Fac Ciencias MARE Ctr Ciencias Mar & Ambiente P-1749016 Lisbon Portugal;

    Pontificia Univ Catolica Valparaiso Escuela Ciencias Mar Altamirano 1480 Chile;

    Univ Lisbon Fac Ciencias MARE Ctr Ciencias Mar & Ambiente P-1749016 Lisbon Portugal;

    Univ Lisbon Fac Ciencias MARE Ctr Ciencias Mar & Ambiente P-1749016 Lisbon Portugal;

    Univ Lisbon Fac Ciencias MARE Ctr Ciencias Mar & Ambiente P-1749016 Lisbon Portugal|Univ Lisbon Dept Biol Vegetal Fac Ciencias P-1749016 Lisbon Portugal;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Phytoplankton assemblage; Environmental conditions; HPLC-CHEMTAX; Microscopy; Upwelling; Chile;

    机译：Phytoplankton组合;环境条件;HPLC-Chemtax;显微镜;升值;智利;

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