Direct Effects of Temperature on Growth of Different Tropical Phytoplankton Species

Mesquita, Marcella Coelho Berjante; Prestes, Ana Carolina Coelho; Gomes, Andreia Maria da Anunciação; Marinho, Marcelo Manzi

doi:10.1007/s00248-019-01384-w

Cited by 16 publications

(16 citation statements)

References 56 publications

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“…In the case of Type 2 with weak upwelling and strong Ekman transport (Figures S5 and S6 in the Supplementary Materials and Table 2) in Region A, the SST still increases by 0.4 • C (Figure 4b). The suitable temperature for tropical phytoplankton is between 20 • C and 30 • C, with some phytoplankton bloom with an increase in temperature [84]. There is a stable input of PAR, an increase of SST and, affected by the strong southwesterly winds in July and August, the Ekman advection transport effect caused by the monsoon spreads the nearshore nutrient-rich salt water to offshore and forms upwelling along the coast of Guangdong (Table 2).…”

Section: Mean Ekman Pumping Velocity/mean Ekman Transport Componentmentioning

confidence: 99%

Association between the Biophysical Environment in Coastal South China Sea and Large-Scale Synoptic Circulation Patterns: The Role of the Northwest Pacific Subtropical High and Typhoons

et al. 2021

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Synoptic weather conditions can modulate short-term variations in the marine biophysical environment. However, the impact of large-scale synoptic circulation patterns (LSCPs) on variations in chlorophyll-a (chl-a) and sea surface temperature (SST) in the South China Sea (SCS) remains unclear. Using a T-mode principal component analysis method, four types of LSCP related to the Northwest Pacific subtropical high are objectively identified over the SCS for the summers of 2015–2018. Type 1 exhibits a lower chl-a concentration of <0.3 mg m−3 offshore of southern Vietnam with respect to the other three types. For Type 2, the high chl-a concentration zone (>0.3 mg m−3) along the coast of Guangdong exhibits the widest areas of coverage. The offshore chl-a bloom jet (>0.3 mg m−3) formed in southern Vietnam is the most obvious under Type 3. Under Type 4, the high chl-a concentration zone along the coast of Guangdong is the narrowest, while the chl-a concentration in the middle of the SCS is the lowest (<0.1 mg m−3). These type differences are mostly caused by the various monsoon circulations, local ocean mesoscale processes and resultant differences in localized precipitation, wind vectors, photosynthetically active radiation and SST. In particular, precipitation over land helps to transport nutrients from the land to the shore, which is conducive to the increase of chl-a. However, precipitation over ocean will dilute the upper seawater and reduce chl-a. Typhoons pump the deeper seawater with nutrients to the surface, and therefore make a positive contribution to chl-a in most offshore areas; however, they also disturb shallower water and hinder the growth of phytoplankton, making a negative contribution near the coast of Guangdong. In general, our findings will provide a better understanding of wind pump impact: the responses of marine biophysical environments to LSCPs.

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Section: Mean Ekman Pumping Velocity/mean Ekman Transport Componentmentioning

confidence: 99%

Association between the Biophysical Environment in Coastal South China Sea and Large-Scale Synoptic Circulation Patterns: The Role of the Northwest Pacific Subtropical High and Typhoons

et al. 2021

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“…When NO 3 decreased, and PO 4 3and temperature increased, diatoms responded by decreasing their abundance, allowing an increase in cyanobacteria. In the reservoir, water temperature was the factor that regulated the seasonal dynamics between these two groups, since cyanobacteria are favored by warm temperatures while diatoms occur in temperate waters (van der Grinten et al, 2005;Mesquita et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Changes in cyanobacterial density due to application of Artificial Floating Island model with macrophytes: an experimental case study in a tropical reservoir

Ramı́rez-Garcı́a¹,

Chicalote-Castillo²

2020

J Limnol

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The Valle de Bravo (VB) reservoir is part of an important hydraulic system that provides about 40% of potable water to 21.5 million inhabitants of the Metropolitan Zone of Mexico City (Mexico). This reservoir shows deterioration in water quality due to its current eutrophic condition, which favors the recurring of cyanobacterial blooms. To date, there are no restoration strategies for this reservoir, so the use of eco-technologies such as Artificial Floating Islands (AFI) is proposed for the removal of nutrients and the improvement of water quality. Therefore, in this work AFIs have been implemented using two macrophytes (Phragmites australis (AFI-P) and Schoenoplectus sp. (AFI-S)) to evaluate the presence and distribution of potentially toxic cyanobacteria in relation to physicochemical variations at the AFI sites. The study was carried out over a period of 24 months (October 2016 -September 2018) divided into two cycles (C-I and C-II) with a dry and rainy season each. Cyanobacteria were the dominant group in the phytoplankton during all the study period. Nine potentially toxic cyanobacterial species were detected, with the predominance of Microcystis aeruginosa, Aphanizomenon yezoense, Pseudanabaena mucicola, Anabaena planctonica and Planktothrix agardhii. In this work, AFIs increased nitrates and had no effect on phosphates. Cyanobacteria were not reduced at AFI sites, however in rainy season in the second annual cycle (C-II) the concentrations of extracellular microcystins in the AFI-P and AFI-S were decreased while intracellular toxins were more strongly reduced only in the AFI-S. Each AFI had a specific effect on four out of five potentially toxic cyanobacteria. Thus, AFI-P promoted the increase of M. aeruginosa but reduced A. planctonica, while AFI-S promoted both A. yezoense and P. mucicola. The AFIs modified the dynamics among cyanobacteria particularly diazotrophic A. yezoense which was favored by nitrates and the other three species maintained their presence by the phosphates. M. aeruginosa, non-diazotrophic, responded to nitrates only in the absence of A. yezoense. Finally, in VB reservoir we found a mutually exclusive relationship between M. aeruginosa and A. yezoense likewise between A. planctonica and P. mucicola.

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“…One of the most negative effects by anthropogenic activities is nutrient pollution (excess nitrogen and phosphorus) [4][5][6]. Since the 1960s, excess nutrients have been discharged into aquatic environments due to the anthropogenic activities, leading to eutrophication in aquatic environments worldwide [7,8]. Eutrophication has been recognized as one of the major threats to global aquatic ecosystems [9].…”

Section: Introductionmentioning

confidence: 99%

Anthropogenic Activities Destabilized Bacterial Co-occurrence Networks in a Subtropical River

Liu

Wang

Chen

2021

Preprint

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Previous studies suggested that strong positive correlations between microbial taxa destabilized microbial co-occurrence network, because network members which had strong positive correlations with each other tended to decrease in abundance synchronously. Anthropogenic activities have strong influences on microbial community composition and diversity in riverine ecosystems, but how they influence the stability of microbial co-occurrence network remain unclear. In this study, we used nutrient concentrations (nitrogen and phosphorus) as an indicator for anthropogenic activities, and explored the effects of anthropogenic activities on the stability of bacterial co-occurrence networks in a subtropical river, Xiyuan River. The nutrient concentrations were higher in midstream and downstream areas than in upstream area of Xiyuan River. The average proportion and correlation coefficient of positive correlations were higher in midstream and downstream networks than in upstream networks, indicating frequent anthropogenic activities destabilized the bacterial co-occurrence networks. To further explore the mechanisms, we found that the changes of network stabilities were associated with the changes of bacterial functions. Anthropogenic activity tolerant bacteria (e.g. nutrient removal, aromatic degradation and pathogen bacteria) and their linked bacterial members formed the large and strong positive modules in the midstream and downstream networks, and thus destabilized the networks. Based on network perspective, our results provide a new insight in the mechanisms of how anthropogenic activities alter riverine microbial communities.

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Direct Effects of Temperature on Growth of Different Tropical Phytoplankton Species

Cited by 16 publications

References 56 publications

Association between the Biophysical Environment in Coastal South China Sea and Large-Scale Synoptic Circulation Patterns: The Role of the Northwest Pacific Subtropical High and Typhoons

Association between the Biophysical Environment in Coastal South China Sea and Large-Scale Synoptic Circulation Patterns: The Role of the Northwest Pacific Subtropical High and Typhoons

Changes in cyanobacterial density due to application of Artificial Floating Island model with macrophytes: an experimental case study in a tropical reservoir

Anthropogenic Activities Destabilized Bacterial Co-occurrence Networks in a Subtropical River

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