Variability in growth and tissue composition (CNP, natural isotopes) of the three morphotypes of holopelagic Sargassum

Changeux, Thomas; Berline, Léo; Podlejski, Witold; Guillot, T; Stiger-Pouvreau,; Connan, Solène; Thibaut, Thierry

doi:10.1016/j.aquabot.2023.103644

Cited by 8 publications

(5 citation statements)

References 24 publications

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“…Despite distinct morphological, physiological, and genetic differences across sargasso morphotypes [39,53,54], the lack of differences in nutrient content across morphotypes in our study is similar to the lack of distinctions found between S. fluitans and S. natans (without morphotype distinction) in studies conducted by Lapointe et al (2021) [21] and McGillicuddy et al (2023) [26]. However, Changeux et al (2023) [55] reported local variations of %N across morphotypes sampled in the Mexican Caribbean region. The lack of differences across morphotypes in our study could be due to the short geographic distance between samples compared with studies whose sample designs had extensive areas, such as oceans and shorelines.…”

Section: Discussionsupporting

confidence: 77%

“…The carbon content across the species of the genus Sargassum is highly variable, ranging from 15 to 37% [57]. The values of carbon within our study fell within this range but had much higher %C (36.2) and lower %N (0.97) and %P (0.04) content compared to macroalgae [44], published values for benthic Sargassum in the Atlantic region [45][46][47], sargasso from the north Atlantic region [21], sargasso from the north Sargasso Sea [26] and sargasso reported in the Mexican Caribbean [54,55]. The CNP values in this study were consistently similar to CNP values of sargasso reported in the south Sargasso Sea [26], with our study having higher %C values, suggesting that sargasso landings in South Florida may be dominated by individuals originating from the Sargasso Sea rather than the GASB.…”

Section: Discussionsupporting

confidence: 67%

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Comprehensive Analysis of Biomass, Nutrient, and Heavy Metal Contributions of Pelagic Sargassum Species (Phaeophyceae) Inundations in South Florida

Hatt,

Bally,

Iporac

et al. 2024

Phycology

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Pelagic Sargassum landings (hereby referred to as sargasso) increased dramatically in 2011 throughout the equatorial tropical Atlantic due to the formation of the Great Atlantic Sargassum Belt (GASB). Despite increasing reports, understanding of local abundances and vegetative characteristics, especially in South Florida, remains limited. From 2018 to 2021, sargasso was collected at two South Florida beaches, with additional sampling at a third beach to assess nutrient and heavy metal concentrations. Biomass landings varied greatly, with S. fluitans III predominant during the “peak season” (May to July) and S. natans I predominant in the “off season”, while S. natans VIII was consistently least abundant. This suggests that South Florida may receive sargasso from the Sargasso Sea during the low season and from the GASB during the peak sargasso season. Across all three morphotypes, mean nitrogen (N) and phosphorus (P) contents were 0.97% and 0.04% (dry weight), respectively. Out of the 16 heavy metals detected, our values were similar to those reported across the Caribbean. Arsenic was the most prevalent heavy metal, with sargasso containing epibionts having higher arsenic concentrations. These results provide comprehensive information to better understand the characteristics and potential origin of sargasso landings in South Florida.

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Section: Discussionsupporting

confidence: 77%

Section: Discussionsupporting

confidence: 67%

Comprehensive Analysis of Biomass, Nutrient, and Heavy Metal Contributions of Pelagic Sargassum Species (Phaeophyceae) Inundations in South Florida

Hatt,

Bally,

Iporac

et al. 2024

Phycology

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“…The modeling of growth and mortality characteristics is poorly constrained by observations or experiments, so this aspect is particularly challenging. The main factors that were identified as essential to take into account to represent Sargassum growth are internal nutrient reserves of nitrogen and phosphorus (Hanisak, 1983), dissolved inorganic nutrients (nitrate, phosphate, ammonium) in the external medium (Changeux et al, 2023;Lapointe, 1986Lapointe, , 1995Lapointe et al, 2014Lapointe et al, , 2021Magaña-Gallegos et al, 2023a, 2023b, solar radiation (Hanisak & Samuel, 1987;Lapointe, 1995), sea surface temperature (Hanisak & Samuel, 1987;Magaña-Gallegos et al, 2023b), sea surface salinity (Hanisak & Samuel, 1987), and surface wind speed (Magaña-Gallegos et al (2023a) found that continuous movement of Sargassum is required to allow growth in ex-situ culture systems).…”

Section: Materials and Methods: The Forecasting Strategymentioning

confidence: 99%

“…In situ observations have also revealed that three different morphotypes are involved in the proliferation (Sargassum fluitans III, Sargassum natans I, and Sargassum natans VIII e.g., Alleyne et al, 2023;Dibner et al, 2022;García-Sánchez et al, 2020;Schell et al, 2015). The eco-physiological features are species dependent, and it has been shown that Sargassum fluitans III, which has been the dominant morphotype over the recent years (García-Sánchez et al, 2020), grows significantly faster than the Sargassum natans morphotypes (Changeux et al, 2023;Corbin & Oxenford, 2023;Magaña-Gallegos et al, 2023a, 2023b. However there is no convergence of the recent studies on the temperature dependance of the different morphotypes (Corbin & Oxenford, 2023;Magaña-Gallegos et al, 2023a, 2023b and there is no knowledge of the salinity, light, or senescence dependence of the different morphotypes.…”

Section: Materials and Methods: The Forecasting Strategymentioning

confidence: 99%

Skillful Seasonal Forecast of Sargassum Proliferation in the Tropical Atlantic

Jouanno,

Morvan,

Berline

et al. 2023

Geophysical Research Letters

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The large‐scale proliferation of pelagic Sargassum in the Tropical Atlantic from 2011 has been the subject of increasing attention because of its negative consequences on the environment, fishing, and socioeconomic activities when stranding on coastal areas. This recurrent phenomenon presents strong seasonal and year to year variations. Anticipating the abundances and stranding on seasonal scale poses important challenges in terms of observations and modeling. We show that skillful seasonal forecast of Sargassum distribution can be achieved with up to 7 months in advance over the Tropical Atlantic, by integrating both transport and current knowledge on physiology of Sargassum. This forecast is designed to help marine stakeholders to develop mitigation and resilience strategies through anticipatory decision‐making.

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“…Studies have revealed clear genetic differentiation among the species and morphotypes [14,15]. They also can differ in resident fauna [13,16], chemical composition [17][18][19][20][21][22][23], and growth rates [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Temporal Changes in the Composition of Beached Holopelagic Sargassum spp. along the Northwestern Coast of Cuba

Torres-Conde,

van Tussenbroek,

Rodríguez-Martínez

et al. 2023

Phycology

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Since 2011, the distribution, abundance, and composition of holopelagic Sargassum spp. (sargasso) have changed by the emergence of the Great Atlantic Sargasso Belt (GASB) in the northern tropical Atlantic. We expected that the north of the Cuban coast would receive sargasso from both the original Sargasso Sea and the GASB. We systematically monitored six beaches on the NW coast of Cuba to assess changes in sargasso composition from June 2019 to June 2021. During landing months, mean Sargasso wet biomass was at 1.54 kg/m2 (SE: 0.7), which was considerably lower than the sargasso on the Atlantic coasts directly impacted by GASB. Eleven out of 13 landings occurred in the autumn-winter seasons 2019–2020 and 2020–2021, with a dominance of S. natans I (accounting for 41–63% of total biomass), followed by S. fluitans III (25–36%) and S. natans VIII (12–31%). This composition is similar to those observed on the Sargasso Sea. During this season, dominant winds (≥14 km/h) came from northern (N), eastern (E), and east-northeastern (ENE) directions. In May and August 2020 (spring-summer season), S. fluitans III dominated (52–56%), followed by S. natans VIII (33–43%) and S. natans I (5–12%). This composition is similar to those observed on GASB-impacted Atlantic coasts in the spring-summer seasons (April to September). During this season, dominant winds (≥20 km/h) came from eastern (E) and east-northeastern (ENE) directions. Thus, the NW Cuba’s morphotype composition suggests that landings have different origin sources depending on season and specific meteorological and oceanographic conditions.

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Variability in growth and tissue composition (CNP, natural isotopes) of the three morphotypes of holopelagic Sargassum

Cited by 8 publications

References 24 publications

Comprehensive Analysis of Biomass, Nutrient, and Heavy Metal Contributions of Pelagic Sargassum Species (Phaeophyceae) Inundations in South Florida

Comprehensive Analysis of Biomass, Nutrient, and Heavy Metal Contributions of Pelagic Sargassum Species (Phaeophyceae) Inundations in South Florida

Skillful Seasonal Forecast of Sargassum Proliferation in the Tropical Atlantic

Temporal Changes in the Composition of Beached Holopelagic Sargassum spp. along the Northwestern Coast of Cuba

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