Impact of Cyanobacteria Blooms on Environment and Health: Comparison
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Cyanobacteria blooms are a global aquatic environment problem. In recent years, dDue to global warming and water eutrophication, the surface cyanobacteria accumulate in a certain area to form cyanobacteria blooms driven by wind. Cyanobacteria blooms change the physical and chemical properties of water and cause pollution. Moreover, cyanobacteria release organic matter, N (nitrogen) and P (phosphorus) into the water during their apoptosis, accelerating the eutrophication of the water, threatening aquatic flora and fauna, and affecting the community structure and abundance of microorganisms in the water. Simultaneously, toxins and carcinogens released from cyanobacteria can be enriched through the food chain/web, endangering human health. 

  • cyanobacteria blooms
  • cyanobacteria toxins
  • aquatic environment

1. Introduction

Cyanobacteria are widely distributed in marine and freshwater, and have more robust adaptability than most eukaryotes [1]. They have the ability to grow and reproduce in extreme environments (ice and snow, hot springs, alkaline soda lakes, brine pools, deserts, and polar regions) [2]. When organic matter, N (Nitrogen), P (Phosphorus), and other nutrients are enriched in water, cyanobacteria multiply and accumulate into dominant groups. The cyanobacteria blooms, which form green, red-brown, and red in freshwater or marine, are one of the most notable symptoms of nutrient enrichment or eutrophication [3]. Cyanobacteria blooms are becoming increasingly common worldwide and pose a serious threat to the sustainability of aquatic ecosystems, such as Taihu Lake in China, Lake Erie in the United States, Lake Winnipeg in Canada, and Lake Nieuwe Meer in the Netherlands [4]. Since the 1930s, plenty of studies have been carried out on cyanobacteria blooms, including the causes of cyanobacteria blooms [5], the harm of cyanobacteria products and the symbiosis of algae and bacteria [6], and the nutrient effect of cyanobacteria blooms [7].

2. The Pollution of Cyanobacteria Blooms to Water

It is considered that cyanobacteria blooms form when the cyanobacteria reaches 105 cells/mL, or the chlorophyll a (Chla) concentration reaches 10 μg/L, and a visible covering layer forms on the surface of the water [8]. The cyanobacteria blooms’ decay process has a more serious impact on the aquatic environment. Aerobic and anaerobic reactions exist in the degradation process of cyanobacteria, and toxins and odorous gases are released. During the decomposition of cyanobacteria blooms, a large number of organic substances and soluble nutrients will be released to water, which will lower the transparency of water, aggravate the eutrophication of water, and form “black spots” [9]. Cyanobacteria blooms will lead to the acidity of the water, the rising trend of conductivity, the continuous increase in chemical oxygen demand, and the increase in organic matter concentration in the water [10]. In addition, organic debris formed by cyanobacteria accumulation has a high decomposition rate in the water, which can be decomposed by 41.9% within 48 h [11], which will harm the ecosystem of the water [8][12]. A large amount of dissolved organic matter (DOM) is released during the decline of cyanobacteria, and with the progress of the reaction, dissolved organic carbon (DOC) is converted into dissolved inorganic carbon (DIC), and most of them are, lastly, transformed into humus, which is challenging to degrade [13].

2.1. Impacts of Cyanobacteria Blooms on Aquatic Fauna

During cyanobacteria blooms, a large number of dead cyanobacteria will sink to the bottom and decompose, consuming oxygen, which will reduce the dissolved oxygen (DO) in water, thus affecting the living conditions of aquatic fauna, causing the disappearance of some fish, shellfish, and invertebrates, and decreasing the species diversity of the aquatic ecosystem [14]. In the apoptosis of cyanobacteria, secondary metabolites such as toxins, odorous substances, and other substances were released into the water, and the concentration of ammonia (NH4+) and microcystins (MCs) will increase simultaneously, causing acute or chronic adverse effects on aquatic organisms [15].
Exposure to MCs leads to lipid peroxidation, DNA damage, and changes in antioxidant enzymes, such as superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) in different aquatic organisms. MCs can cause damage to their circulatory system, digestive system, and immune system. Simultaneously, they will induce changes in detoxification enzymes such as glutathione S-transferase (GST) and glutathione peroxidase (GPx) [16]. Studies have demonstrated that the liver is the main target of MCs [17]. By studying the bioaccumulation law of MCs in two snails in a cyanobacteria-bloom plateau lake, it was found that the hepatopancreas was the main target of two snails [18]. Some reports indicate that the concentration of MCs in the intestines, gonads, and muscles of Cyprinus carpio was lower but higher in hepatopancreas [19]. MCs are enriched in the hepatopancreas of Macrobrachium rosenbergii, destroying the structure and function of hepatopancreas, causing dose-dependent and time-dependent toxic effects [20]. Andersen et al. found that a high dose of microcystin-LR (MC-LR) could lead to diffuse necrosis and hepatic megalocytosis in the whole liver of Atlantic salmon [21]. Previous studies have demonstrated that MCs can be transferred to more sensitive organisms through the food chain/network [22].
NH4+ can induce the antioxidant defense of juvenile crucian carp. High concentration NH4+ has toxic effects on CAT, SOD, and glutathione (GSH) in the fish liver [23]. Histopathological changes in the gills, liver, and kidney of Oreochromis niloticus are caused by different concentrations of NH4+, and include gill congestion, telangiectasia, turbid swelling, edema degeneration of liver tissue, kidney congestion, and glomerulonephritis [24]. NH4+ significantly affects the plasma and hematological parameters of juvenile Megalabrama amblycephala, demonstrating histopathological changes in the gills, liver, and kidney of fish. The severity of the lesions is different, with the liver exhibiting the most extensive damage, followed by the gills and kidneys [25].
In addition, it is reported that MCs and NH4+ have synergistic effects on the immunotoxicity of aquatic organisms. After combined poisoning, the peripheral interspace of the lymphocytes of Megalabrama amblycephala is broadened, the nucleus is atrophied, and the mitochondria are swollen. Moreover, the exposure to algae toxin and NH4+ has a significant interaction with macrophage phagocytosis activity, respiratory burst activities, a total number of white blood cells and the transcriptional levels of sIgM, mIgD, and sIgZ genes of Megalabrama amblycephala [15].

2.2. Impacts of Cyanobacteria Blooms on Aquatic Flora

The cyanobacteria blooms have strong inhibitory effect on the photosynthetic activity of aquatic flora, leading to leaf death and irreversible inhibition of photosynthesis [26]. Long-term and high-concentration aggregation of cyanobacteria will shade, consume oxygen, and release allelochemicals and MCs, resulting in the disappearance of submerged vegetation [27]. Cyanobacteria blooms lead to the Chla of Potamongeton malaianus and Stuckenia pectinata decreasing by 50% and 56%, respectively [28].
MCs can induce the reactive oxygen species (ROS) production and an increase in malondialdehyde (MDA), exacerbating the oxidative damage for aquatic flora [29]. MCs can bind irreversibly with phosphatase-1 (PP1) and phosphatase-2A (PP2A) covalently, causing a series of biochemical reactions in cells to be disordered and changing chlorophyll contents and pigment composition in plants [30].
The anatoxin-a produced by cyanobacteria can cause the disorder of oxidative stress reaction in aquatic flora [31]. Treatment with 0.01–0.2 μg/mL MC-LR for 96 h can inhibit the growth of Spirodela oligorrhiza [32]. MC-LR concentration of 1.0 μg/L can significantly impede the development of the roots of Lepidium sativum, and a concentration of 10 μg/L can inhibit the growth of the whole plant [33]. It has also been found that 0.12–3 μg/mL MCs can hinder the growth of Oryza sativa L. [34]. In addition, MCs can cause the gap of aeration tissue in the rhizomes of Phragmites australis to be blocked by callus-like tissue, resulting in the gangrene of outer skin tissue in the reed root. When exposed to 10–40 μg/mL of MC-LR for 120 h, the cytoskeleton of reed root changes (microtubule degradation), and its roots swell and deform [35].
MCs can damage DNA and produce genotoxicity. Nuclear shrinkage and chromatin condensation can be observed in the root tip meristem cells of Phragmites australis treated with MCs, and chromatin condensation is often accompanied by nuclear shrinkage and apoptosis [36]. DNA damage effect of MCs on Oryza sativa root cells by DNA fragmentation and random amplified polymorphic DNA (RAPD) [37]. Furthermore, the affected biochemical processes involved protein folding and stress response, protein biosynthesis, regulation of cell signal and gene expression, and energy and carbohydrate metabolism [38].
The high concentrations of NH4+ and nitrate nitrogen (NO3−-N) released by cyanobacteria decay have toxic effects on aquatic plants, resulting in the yellowing of plant leaves, inhibition of growth, and root morphological changes [39]. A high concentration of NH4+ can also inhibit the absorption of K+, Ca2+ and Mg2+ by plant cells, resulting in a disturbance of ion balance [40]. Studies have also demonstrated that a high concentration of NH4+ leads to the destruction of the antioxidant system balance of aquatic flora, and the accumulation of ROS, which leads to the damage of plasma membrane [41].

2.3. Impact of Cyanobacteria Blooms on Microorganisms in the Aquatic Environment

Studies on the effects of cyanobacteria blooms on microorganisms in water mainly focus on the community structure and activity of microorganisms, especially at the genus level [42]. Cyanobacteria blooms in the summer, and the abundance of Proteobacteria in the water and sediment of Zhushan Bay is the highest at the phylum level, followed by Actinomycetes. At the genus level, the dominant bacteria in the water are GpXI and GpIIa, and the predominant bacteria in the sediment are Gp6 and GpIIa [43]. Meanwhile, the different stages of cyanobacteria blooms will lead to changes in DO, N, and P in surface sediments [44]. Studies have studied and analyzed the bacterial community diversity in Poyang Lake waters and found a specific correlation between DO, Cond, salinity, mineralization, nutrients, and bacterial community diversity index [45]. In addition, debris formed during the degradation of cyanobacteria will precipitate into the surface sediments, stimulating the growth of microorganisms. Studies have demonstrated that the total bacterial diversity of water decreases during cyanobacteria blooms [46]. The decomposition of cyanobacteria will increase the diversity and abundance of ammoniated bacteria in sediments, among which the relative abundance of Nitrosomonas oligotropha is as high as 75% [47].
Studies have demonstrated that the accumulation of cyanobacteria will lead to a change in microbial community structure and a decrease in diversity in the chironomid larvae gut. The relative abundance of β-proteobacteria increased to 40.6%, and the relative abundance of δ-proteobacteria decreased to 4.1%. Moreover, cyanobacteria blooms can promote the expression of the nosZ gene and increase the abundance of nirK denitrifying bacteria [48]. The occurrence of cyanobacteria blooms will lead to the decrease in α-diversity of the bacterial community [49].

3. Impacts of Cyanobacteria Blooms on Human Health

Cyanobacteria blooms directly affect drinking water. In 1996, in Caruaru, Brazil, 50 dialysis clinic patients died because of using water contaminated with MCs [50]. In 1999, the cyanobacteria blooms in Dianchi Lake covered an area of 20 km2. In May 2007, a massive cyanobacteria bloom in Taihu Lake (Wuxi, China) led to a drinking water crisis for 2 million people in the city of Wuxi [51]. In August 2014, cyanobacteria blooms in Lake Erie increased the concentration of MCs in the drinking water, threatening the drinking water safety of nearly half a million people [52].
When cyanobacteria blooms decompose, releasing many odor substances and cyanotoxins, it has been found that 2-methylisoborneol (MIB) and geosmin are the most common substances that cause odor (musty smell) in drinking water, and their odor threshold concentrations are only 9 and 4 ng/L, respectively [53]. Among the eight kinds of odor in the table, except the chemical taste, chloride taste, and medicinal taste, the other five kinds of odor substances are related to odor compounds produced by algae. Excessive odor content in water affects the quality of drinking water and human health [51].
Cyanobacteria can release toxins such as the hepatotoxin class, neurotoxin, and endotoxin. MCs is the most widely distributed in water, which is a cyclic heptapeptide composed of seven amino acids, mainly produced by Microcystis and Anabaena [15]. Microcystis is the dominant species of cyanobacteria blooms in Taihu Lake, and its biomass can account for 40–98% of the total algae biomass [54]. Anabaena is the most common species in cyanobacteria blooms and the only species with hepatotoxic and neurotoxic secondary metabolites [55]. Turner et al. analyzed the MCs of cyanobacteria in freshwater ecosystems in the United Kingdom and found that more than 50% of the water bodies had MCs, and of which about 13% exceeded the World Health Organization (WHO) medium health threshold (20 μg/L) [56].
The toxins can be accumulated by organisms and transferred through the food chain/network. Cyanotoxins are chronically toxic to humans, which lead to acute gastroenteritis, respiratory adverse reaction, eye and ear irritation, skin rash, mouth ulcers, and other diseases [57]. In addition, algal toxins can inhibit the synthesis of protein phosphatase, resulting in hyperphosphorylation of critical regulatory proteins in the signal transduction process that controls cytoskeleton tissues [58].
MCs are hydrophilic and soluble in the blood of organisms. They cannot penetrate the lipid membrane through passive diffusion [59]. Therefore, most ingested toxins cannot pass through the ileal epithelium, stay in the digestive tract, and are most likely excreted through feces [60]. However, some studies have demonstrated that ingested MCs can be transported by bile acid membrane transporters (such as organic anion transporters (OATPs)) through the ileum into the venous blood flow and from the portal vein into hepatocytes [61]. The liver is the main target organ for the accumulation and detoxification of MCs. At the same time, MCs can also be detected in other organs (such as the intestine, kidney, brain, lung, and heart), though to a much lesser extent. High doses of cyanobacterial toxins can cause acute liver damage, hepatomegaly, liver hemorrhage, loss of liver cell structure and function, and even biological respiratory arrest [62].

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