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No. de sistema: 000059540

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040 _ _ a| ECO
c| ECO
043 _ _ a| n-mx-qr
044 _ _ a| enk
245 0 0 a| Sargassum blooms in the Caribbean alter the trophic structure of the sea urchin Diadema antillarum
506 _ _ a| Acceso en línea sin restricciones
520 1 _ a| The arrival of large masses of drifting Sargassum since 2011 has caused changes in the natural dynamics of Caribbean coastal ecosystems. In the summer of 2015, unprecedented and massive mats of S. fluitans and S. natans have been observed throughout the Mexican Caribbean including exceptional accumulations ashore. This study uses stable isotopes to assess the impact of Sargassum blooms on the trophic dynamics of the Diadema antillarum sea urchin, a keystone herbivore on many Caribbean reefs. Bayesian models were used to estimate the variations in the relative proportions of carbon and nitrogen of assimilated algal resources. At three lagoon reef sites, the niche breadth of D. antillarum was analysed and compared under massive influx of drifting Sargassum spp. vs. no influx of Sargassum blooms. The effects of the leachates generated by the decomposition of Sargassum led to hypoxic conditions on these reefs and reduced the taxonomic diversity of macroalgal food sources available to D. antillarum. Our trophic data support the hypothesis that processes of assimilation of carbon and nitrogen were modified under Sargassum effect. Isotopic signatures of macroalgae associated with the reef sites exhibited significantly lower values of 15N altering the natural herbivory of D. antillarum. The Stable Isotopes Analysis in R (SIAR) indicated that, under the influence of Sargassum blooms, certain algal resources (Dictyota, Halimeda and Udotea) were more assimilated due to a reduction in available algal resources. Despite being an abundant available resource, pelagic Sargassum was a negligible contributor to sea urchin diet.
520 1 _ a| The Stable Isotope Bayesian Ellipses in R (SIBER) analysis displayed differences between sites, and suggests a reduction in trophic niche breadth, particularly in a protected reef lagoon. Our findings reveal that Sargassum blooms caused changes in trophic characteristics of D. antillarum with a negative impact by hypoxic conditions. These dynamics, coupled with the increase in organic matter in an oligotrophic system could lead to reduce coral reef ecosystem function.
530 _ _ a| Disponible en línea
533 _ _ a| Reproducción electrónica en formato PDF
538 _ _ a| Adobe Acrobat profesional 6.0 o superior
650 _ 4 a| Sargassum fluitans
650 _ 4 a| Sargassum natans
650 _ 4 a| Pelagic sargassum
650 _ 4 a| Diadema antillarum
651 _ 4 a| Mahahual, Othón P. Blanco (Quintana Roo, México)
651 _ 4 a| Xahuachol, Othón P. Blanco (Quintana Roo, México)
651 _ 4 a| Xcalak, Othón P. Blanco (Quintana Roo, México)
700 1 _ a| Cabanillas Terán, Nancy
e| autor
700 1 _ a| Hernández Arana, Héctor Abuid
e| autor
700 1 _ a| Ruíz Zárate, Miguel Ángel
e| autor
700 1 _ a| Vega Zepeda, Alejandro
e| autor
700 1 _ a| Sánchez González, Alberto
e| autor
773 0 _
t| PeerJ
g| Vol. 7, no. e7589 (August 2019)
x| 2167-8359
856 4 1 u| https://peerj.com/articles/7589/
z| Artículo electrónico
901 _ _ a| Artículo con arbitraje
902 _ _ a| JSGM
904 _ _ a| Octubre 2019
905 _ _ a| Artecosur
905 _ _ a| Artfrosur
905 _ _ a| Biblioelectrónica
LNG eng
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Sargassum blooms in the Caribbean alter the trophic structure of the sea urchin Diadema antillarum
Cabanillas Terán, Nancy (autor)
Hernández Arana, Héctor Abuid (autor)
Ruíz Zárate, Miguel Ángel (autor)
Vega Zepeda, Alejandro (autor)
Sánchez González, Alberto (autor)
Nota: Disponible en línea
Acceso en línea sin restricciones
Contenido en: PeerJ. Vol. 7, no. e7589 (August 2019). ISSN: 2167-8359
No. de sistema: 59540
Tipo: - Artículo con arbitraje
PDF


Inglés

"The arrival of large masses of drifting Sargassum since 2011 has caused changes in the natural dynamics of Caribbean coastal ecosystems. In the summer of 2015, unprecedented and massive mats of S. fluitans and S. natans have been observed throughout the Mexican Caribbean including exceptional accumulations ashore. This study uses stable isotopes to assess the impact of Sargassum blooms on the trophic dynamics of the Diadema antillarum sea urchin, a keystone herbivore on many Caribbean reefs. Bayesian models were used to estimate the variations in the relative proportions of carbon and nitrogen of assimilated algal resources. At three lagoon reef sites, the niche breadth of D. antillarum was analysed and compared under massive influx of drifting Sargassum spp. vs. no influx of Sargassum blooms. The effects of the leachates generated by the decomposition of Sargassum led to hypoxic conditions on these reefs and reduced the taxonomic diversity of macroalgal food sources available to D. antillarum. Our trophic data support the hypothesis that processes of assimilation of carbon and nitrogen were modified under Sargassum effect. Isotopic signatures of macroalgae associated with the reef sites exhibited significantly lower values of 15N altering the natural herbivory of D. antillarum. The Stable Isotopes Analysis in R (SIAR) indicated that, under the influence of Sargassum blooms, certain algal resources (Dictyota, Halimeda and Udotea) were more assimilated due to a reduction in available algal resources. Despite being an abundant available resource, pelagic Sargassum was a negligible contributor to sea urchin diet."

"The Stable Isotope Bayesian Ellipses in R (SIBER) analysis displayed differences between sites, and suggests a reduction in trophic niche breadth, particularly in a protected reef lagoon. Our findings reveal that Sargassum blooms caused changes in trophic characteristics of D. antillarum with a negative impact by hypoxic conditions. These dynamics, coupled with the increase in organic matter in an oligotrophic system could lead to reduce coral reef ecosystem function."


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