Drivers of a window of opportunity for Dinophysis acuminata in a mussel seed-bank hotspot in Northwestern Patagonia

IF 5.5 1区 生物学 Q1 MARINE & FRESHWATER BIOLOGY Harmful Algae Pub Date : 2025-02-28 DOI:10.1016/j.hal.2025.102830
Ángela M. Baldrich , Manuel Díaz , Camilo Rodríguez-Villegas , René Garreaud , Lauren Ross , Iván Pérez-Santos , Camila Schwerter , Pamela Carbonell , Patricio A. Díaz
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Abstract

Chilean shellfish production is a significant contributor to the world´s marine aquaculture industry (∼22 % of the global mussel production). Most of this activity takes place in the Patagonian fjords system of southern Chile. Reloncaví Fjord (∼41°S), in northwestern Patagonia, represents the largest mytilid seed supply source for Chilean mussel aquaculture. In this fjord, Dinophysis acuminata —a lipophilic toxins producer— has been frequently found above detection levels (102 cells L−1) during the regular monitoring program, reaching maximum densities in the spring and summer seasons. The bloom development of D. acuminata has been associated with the stratification of the water column and prey (Mesodinium spp.) availability. However, the drivers underlying D. acuminata spatial and temporal dynamics in the fjord are still poorly understood. From January 2019 to March 2020, measurements of physicochemical parameters and water samples (0 – 20 m depth) were collected weekly, biweekly, and monthly to analyse the spatiotemporal distribution of D. acuminata and the water column structure, at a fixed station at the head of Reloncaví Fjord. D. acuminata was observed in summer and spring of 2019, with a maximum of 2.1 × 103 cells L−1 in the early summer of 2019. In contrast, D. acuminata was absent in the summer of 2020. Results from a redundancy analysis (RDA) and generalized linear models (GLM) suggested that water salinity, and diminished nitrite and silicate probably enhanced by a moderate rainfall deficit in summer of 2019, explained the presence of D. acuminata. Thus, the results of the 15 months of sampling, including two summer seasons, allowed us i) to elucidate environmental drivers that provided a window of opportunity for D. acuminta population growth, and ii) to highlight that the abundance and distribution of a stress-tolerant species is a multifactorial response in which slight changes in specific environmental conditions can have a large influence.
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智利的贝类生产是世界海洋水产养殖业的重要组成部分(占全球贻贝产量的 22%)。这项活动大多发生在智利南部的巴塔哥尼亚峡湾系统。位于巴塔哥尼亚西北部的雷隆卡维峡湾(41°S)是智利贻贝养殖业最大的贻贝苗种供应来源。在该峡湾,亲脂性毒素生产者 Dinophysis acuminata 在常规监测项目中经常被发现超过检测水平(102 个细胞 L-1),并在春季和夏季达到最高密度。D. acuminata 的繁殖发展与水体分层和猎物(Mesodinium spp.)然而,人们对峡湾中 D. acuminata 的空间和时间动态的驱动因素仍然知之甚少。从 2019 年 1 月至 2020 年 3 月,每周、每两周和每月在雷龙卡维峡湾头部的一个固定站点采集理化参数和水样(0 - 20 米深),以分析 D. acuminata 的时空分布和水柱结构。在 2019 年夏季和春季观察到了 D. acuminata,在 2019 年初夏达到最大值 2.1 × 103 cells L-1。相比之下,2020 年夏季没有发现 D. acuminata。冗余分析(RDA)和广义线性模型(GLM)的结果表明,水体盐度以及亚硝酸盐和硅酸盐的减少(可能因 2019 年夏季中度降雨不足而增加)是出现 D. acuminata 的原因。因此,包括两个夏季在内的 15 个月的采样结果使我们能够:(1)阐明为 D. acuminta 种群增长提供机会之窗的环境驱动因素;(2)强调耐压物种的丰度和分布是一种多因素反应,其中特定环境条件的微小变化会产生很大影响。
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来源期刊
Harmful Algae
Harmful Algae 生物-海洋与淡水生物学
CiteScore
12.50
自引率
15.20%
发文量
122
审稿时长
7.5 months
期刊介绍: This journal provides a forum to promote knowledge of harmful microalgae and macroalgae, including cyanobacteria, as well as monitoring, management and control of these organisms.
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