浅层富营养化湖泊中蓝藻水华二十年的动态变化:结合光学显微镜的遥感方法

IF 2.2 3区 生物学 Q1 MARINE & FRESHWATER BIOLOGY
Kersti Kangro, Anne-Mai Pall, Reet Laugaste, Kai Piirsoo, Kairi Maileht, Ian-Andreas Rahn, Krista Alikas
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引用次数: 0

摘要

蓝藻水华是一种普遍现象,由于气候变化和气温升高,预计其发生频率、规模和持续时间都会增加。我们研究了遥感(光学、微波、热学)的可能性,以加强我们对浅水、富营养化、跨界湖泊 Peipsi 的水华动态及其参数的了解。哨兵-3/OLCI(海洋和陆地色彩仪器)和 ENVISAT/MERIS(中分辨率成像光谱仪)数据用于叶绿素 a(Chl a)检测,并从中检索水华参数。当叶绿素 a 浓度超过长期平均值至少 5%时,像素被归类为 "水华"。所有湖区的最大水华覆盖率约为 100%,但平均而言,水华覆盖了 Lämmijärv 湖的 96.5%、Peipsi sensu stricto(s.s.)湖的 85.0%、Pihkva 湖的 84.5%。平均而言,藻华在 Peipsi s.s.持续了 101 天,在 Lämmijärv 持续了 78 天,在 Pihkva 湖持续了 69 天。水位越高,莱米耶尔湖和皮赫瓦湖的水华持续时间越短。传统的显微镜观察法可概括出主要的藻华形成者及其在 20 年间的变化情况。在过去 10 年中,Gloeotrichia echinulata P.G.Richter 在 Peipsi s.s 的重要性有所下降,而 Aphanizomenon 在整个湖泊中的重要性有所上升。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Two decades of cyanobacterial bloom dynamics in a shallow eutrophic lake: remote sensing methods in combination with light microscopy

Two decades of cyanobacterial bloom dynamics in a shallow eutrophic lake: remote sensing methods in combination with light microscopy

Cyanobacterial blooms are widespread phenomena, expected to increase in frequency, magnitude, and duration due to a changing climate and increasing temperatures. We looked at remote sensing (optical, microwave, thermal) possibilities to enhance our understanding of bloom dynamics and its parameters, retrievable from satellite data in the shallow, eutrophic, transboundary lake Peipsi. Sentinel-3/OLCI (Ocean_and_Land_Colour_Instrument) and ENVISAT/MERIS (Medium_Resolution_Imaging_Spectrometer) data were used for Chlorophyll a (Chl a) detection, from which bloom parameters were retrieved. Pixels were categorized as “bloom” when Chl a concentration exceeded the long-term average by at least 5%. Maximal bloom coverage was about 100% in all parts of the lake, but on average, the blooms covered 96.5% of Lämmijärv, 85.0% of Peipsi sensu stricto (s.s.), and 84.5% of Lake Pihkva. On average, the blooms lasted 101 days in Peipsi s.s., 78 days in Lämmijärv, and 69 days in Lake Pihkva. Higher water levels resulted in significantly shorter blooms in Lämmijärv and Lake Pihkva. Traditional microscopy gave an overview of the main bloom-formers and their changes over a 20-years period. The importance of Gloeotrichia echinulata P.G.Richter has decreased in the last 10 years in Peipsi s.s and the importance of Aphanizomenon has increased in the entire lake.

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来源期刊
Hydrobiologia
Hydrobiologia 生物-海洋与淡水生物学
CiteScore
5.40
自引率
11.50%
发文量
288
审稿时长
4.9 months
期刊介绍: Hydrobiologia publishes original research, reviews and opinions regarding the biology of all aquatic environments, including the impact of human activities. We welcome molecular-, organism-, community- and ecosystem-level studies in contributions dealing with limnology and oceanography, including systematics and aquatic ecology. Hypothesis-driven experimental research is preferred, but also theoretical papers or articles with large descriptive content will be considered, provided they are made relevant to a broad hydrobiological audience. Applied aspects will be considered if firmly embedded in an ecological context.
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