Molecular investigation of harmful cyanobacteria reveals hidden risks and niche partitioning in Kenyan Lakes

IF 5.5 1区 生物学 Q1 MARINE & FRESHWATER BIOLOGY Harmful Algae Pub Date : 2024-11-10 DOI:10.1016/j.hal.2024.102757
Brittany N. Zepernick , Lauren N. Hart , Emily E. Chase , Kaela E. Natwora , Julia A. Obuya , Mark Olokotum , Katelyn A. Houghton , E. Anders Kiledal
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Abstract

Despite the global expansion of cyanobacterial harmful algal blooms (cHABs), research is biased to temperate systems within the global north, such as the Laurentian Great Lakes. This lack of diversity represents a significant gap in the field and jeopardizes the health of those who reside along at-risk watersheds in the global south. The African Great Lake, Lake Victoria, is understudied despite serving as the second largest lake by surface area and demonstrating year-round cHABs. Here, we address this knowledge gap by performing a molecular survey of cHAB communities in three anthropogenically and ecologically important freshwater systems of Victoria's Kenyan watershed: Winam Gulf (Lake Victoria), Lake Simbi and Lake Naivasha. We identified a bloom of non-toxic Dolichospermum and toxic Microcystis in the Winam Gulf, with data suggesting sulfur limitation shapes competition dynamics between these two bloom-formers. Though we did not detect a bloom in Naivasha, it contained the largest diversity of cHAB genera amongst the three lakes. In turn, our results indicated methane metabolism may allow non-toxic picoplankton to outcompete cHAB genera, while suggesting Synechococcus spp. serves as a methane source and sink in this system. Lake Simbi exhibited a non-toxic Limnospira bloom at the time of sampling with very low abundances of cHAB genera present. Subsequently, these results were employed to design a cHAB screening and risk assessment framework for local stakeholders. Cumulatively, this work serves to increase cHAB research efforts on the international scale while serving as an impetus for cHAB monitoring on the local scale.
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有害蓝藻的分子研究揭示了肯尼亚湖泊中隐藏的风险和生态位划分
尽管蓝藻有害藻华(cHABs)在全球范围内蔓延,但研究却偏重于全球北部的温带系统,例如劳伦伦五大湖。这种多样性的缺乏是该领域的一个重大空白,并危及全球南部高危流域居民的健康。非洲大湖维多利亚湖(Lake Victoria)尽管是面积第二大的湖泊,而且全年都会发生 cHABs,但对它的研究却很不够。在此,我们通过对维多利亚湖肯尼亚流域三个具有重要人类和生态意义的淡水系统中的 cHAB 群落进行分子调查,填补了这一知识空白:维纳姆湾(维多利亚湖)、辛比湖和奈瓦沙湖。我们在维纳姆湾发现了无毒的多利可囊藻(Dolichospermum)和有毒的微囊藻(Microcystis)的藻华,数据表明硫限制影响了这两种藻华形成者之间的竞争态势。虽然我们在奈瓦沙没有发现藻华,但该湖中的 cHAB 属的多样性在三个湖泊中是最高的。反过来,我们的研究结果表明,甲烷代谢可能会使无毒的浮游微藻超越 cHAB 藻属,同时表明 Synechococcus spp.是该系统中的甲烷源和汇。取样时,Simbi 湖呈现出无毒的褐藻藻华,cHAB 属的丰度非常低。随后,利用这些结果为当地利益相关者设计了一个 cHAB 筛选和风险评估框架。总之,这项工作有助于加强国际范围内的 cHAB 研究工作,同时推动地方范围内的 cHAB 监测工作。
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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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