Effect of herbicides based on glyphosate on the photosynthesis of green macroalgae in tropical lotic environments

2021 ◽  
Author(s):  
Régis de Campos Oliveira ◽  
Lucas Kortz Vilas Boas ◽  
Ciro Cesar Zanini Branco
Keyword(s):  
Green Macroalgae ◽  
Lotic Environments

scholarly journals Hindcast and Near Real-Time Monitoring of Green Macroalgae Blooms in Shallow Coral Reef Lagoons Using Sentinel-2: A New-Caledonia Case Study

2021 ◽  
Vol 13 (2) ◽  
pp. 211
Author(s):  
Maële Brisset ◽  
Simon Van Wynsberge ◽  
Serge Andréfouët ◽  
Claude Payri ◽  
Benoît Soulard ◽  
...  
Keyword(s):  
Green Algae ◽  
Algal Blooms ◽  
New Caledonia ◽  
Spectral Indices ◽  
Green Macroalgae ◽  
Spectral Bands ◽  
Algae Blooms ◽  
Trade Offs ◽  
Sentinel 2

Despite the necessary trade-offs between spatial and temporal resolution, remote sensing is an effective approach to monitor macroalgae blooms, understand their origins and anticipate their developments. Monitoring of small tropical lagoons is challenging because they require high resolutions. Since 2017, the Sentinel-2 satellites has provided new perspectives, and the feasibility of monitoring green algae blooms was investigated in this study. In the Poé-Gouaro-Déva lagoon, New Caledonia, recent Ulva blooms are the cause of significant nuisances when beaching. Spectral indices using the blue and green spectral bands were confronted with field observations of algal abundances using images concurrent with fieldwork. Depending on seabed compositions and types of correction applied to reflectance data, the spectral indices explained between 1 and 64.9% of variance. The models providing the best statistical fit were used to revisit the algal dynamics using Sentinel-2 data from January 2017 to December 2019, through two image segmentation approaches: unsupervised and supervised. The latter accurately reproduced the two algal blooms that occurred in the area in 2018. This paper demonstrates that Sentinel-2 data can be an effective source to hindcast and monitor the dynamics of green algae in shallow lagoons.

scholarly journals Caulerpenyne Affects Bradykinin-Induced Intracellular Calcium Kinetics in LoVo Cells

2021 ◽  
Vol 11 (6) ◽  
pp. 2697
Author(s):  
Giovanna Traina
Keyword(s):  
Intracellular Calcium ◽  
Cell Lines ◽  
Calcium Homeostasis ◽  
Human Colon ◽  
Caulerpa Taxifolia ◽  
Green Macroalgae ◽  
Calcium Kinetics ◽  
Lovo Cells ◽  
Pharmacological Interest ◽  
Antiproliferative Activities

Sesquiterpene caulerpenyne (CYN) is the major metabolite present in green macroalgae Caulerpa taxifolia. This metabolite has been shown to be cytotoxic in some cell lines and was found to be active in various assays of pharmacological interest. In addition, it exerts antibiotic, antiviral, phytotoxic, antidyslipidemic, and antiproliferative activities. In the present study, we report that pretreatment with CYN decreases the bradykinin-induced calcium peak in human colon LoVo cells. We hypothesize that CYN pretreatment may adversely affect bradykinin-induced intracellular calcium increases. The data suggest that CYN, by reducing the increase in intracellular calcium, exerts an inhibitory role on calcium homeostasis and, likely, intercellular transmission.

scholarly journals Macroalgae

Encyclopedia ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 177-188
Author(s):  
Leonel Pereira
Keyword(s):  
Carbon Dioxide ◽  
Chlorophyll A ◽  
Red Algae ◽  
Great Variability ◽  
Marine Macroalgae ◽  
Brown Macroalgae ◽  
Green Macroalgae ◽  
Red Macroalgae ◽  
Photosynthetic Organisms ◽  
Green Pigments

What are algae? Algae are organisms that perform photosynthesis; that is, they absorb carbon dioxide and release oxygen (therefore they have chlorophyll, a group of green pigments used by photosynthetic organisms that convert sunlight into energy via photosynthesis) and live in water or in humid places. Algae have great variability and are divided into microalgae, small in size and only visible through a microscope, and macroalgae, which are larger in size, up to more than 50 m (the maximum recorded was 65 m), and have a greater diversity in the oceans. Thus, the term “algae” is commonly used to refer to “marine macroalgae or seaweeds”. It is estimated that 1800 different brown macroalgae, 6200 red macroalgae, and 1800 green macroalgae are found in the marine environment. Although the red algae are more diverse, the brown ones are the largest.

scholarly journals Overview on the Antihypertensive and Anti-Obesity Effects of Secondary Metabolites from Seaweeds

Marine Drugs ◽  
2018 ◽  
Vol 16 (7) ◽  
pp. 237 ◽  
Author(s):  
Ana Seca ◽  
Diana Pinto
Keyword(s):  
Clinical Manifestations ◽  
Stress Release ◽  
Cellular Mechanisms ◽  
Comprehensive Overview ◽  
Green Macroalgae ◽  
Drug Discovery And Development ◽  
Pure Compounds ◽  
Future Drug ◽  
Potential Use ◽  
Significant Factors

Hypertension and obesity are two significant factors that contribute to the onset and exacerbation of a cascade of mechanisms including activation of the sympathetic and renin-angiotensin systems, oxidative stress, release of inflammatory mediators, increase of adipogenesis and thus promotion of systemic dysfunction that leads to clinical manifestations of cardiovascular diseases. Seaweeds, in addition to their use as food, are now unanimously acknowledged as an invaluable source of new natural products that may hold noteworthy leads for future drug discovery and development, including in the prevention and/or treatment of the cardiovascular risk factors. Several compounds including peptides, phlorotannins, polysaccharides, carotenoids, and sterols, isolated from brown, red and green macroalgae exhibit significant anti-hypertensive and anti-obesity properties. This review will provide a comprehensive overview of the recent advances on bioactive pure compounds isolated from different seaweed sources focusing on their potential use as drugs to treat or prevent hypertension and obesity. On the other hand, although it is obvious that macroalgae represent promising sources of antihypertensive and anti-obesity compounds, it is also clear that further efforts are required to fully understand their cellular mechanisms of action, to establish structure-inhibition relationships and mainly to evaluate them in pre-clinical and clinical trials.

New records of Trachelomonas Ehrenberg (Euglenophyceae) in lotic environments of the buffer zone of Iguaçu National Park, Paraná, Brazil

2015 ◽  
Vol 38 (2) ◽  
pp. 343-356
Author(s):  
Liliane Caroline Servat ◽  
Norma Catarina Bueno ◽  
Sandra Maria Alves-da-Silva
Keyword(s):  
National Park ◽  
New Records ◽  
Buffer Zone ◽  
Lotic Environments

scholarly journals Are Native and Nonindigenous Seaweeds Overgrowing Florida's East Coast Reefs?

EDIS ◽  
2006 ◽  
Vol 2006 (16) ◽  
Author(s):  
Charles Jacoby ◽  
Brian Lapointe ◽  
LeRoy Creswell
Keyword(s):  
Coastal Waters ◽  
East Coast ◽  
Economic Consequences ◽  
University Of Florida ◽  
Green Macroalgae ◽  
Fact Sheet ◽  
Macroalgal Blooms

SGEF-156, a 2-page illustrated fact sheet by Charles Jacoby, Brian LaPointe, and LeRoy Creswell, discusses the excessive growth of green macroalgae, or seaweed, on the reefs around Palm Beach Florida. It documents the observations and surveys of several plants in recent years, describes the ecological and economic consequences of macroalgal blooms, and urges readers to work to lower the amount of nutrients finding their way into coastal waters and avoid fueling macroalgal blooms. Published by Florida Sea Grant, University of Florida, IFAS Extension, June 2004.

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