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  • 1
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    Seawater carbonate chemistry and coral calcification (2020)
    PANGAEA
    Details
    Publication Date: 2024-03-15
    Description: Coral reefs are constructed by calcifiers that precipitate calcium carbonate to build their shells or skeletons through the process of calcification. Accurately assessing coral calcification rates is crucial to determine the health of these ecosystems and their response to major environmental changes such as ocean warming and acidification. Several approaches have been used to assess rates of coral calcification but there is a real need to compare these approaches in order to ascertain that high quality and intercomparable results can be produced. Here, we assessed four methods (total alkalinity anomaly, calcium anomaly, 45Ca incorporation and 13C incorporation) to determine coral calcification of the reef-building coral Stylophora pistillata. Given the importance of environmental conditions on this process, the study was performed under two pH (ambient and low level) and two light (light and dark) conditions. Under all conditions, calcification rates estimated using the alkalinity and calcium anomaly techniques as well as 45Ca incorporation were highly correlated. Such a strong correlation between the alkalinity anomaly and 45Ca incorporation techniques has not been observed in previous studies and most probably results from improvements described in the present paper. The only method which provided calcification rates significantly different from the other three techniques was 13C incorporation. Calcification rates based on this method were consistently higher than those measured using the other techniques. Although reasons for these discrepancies remain unclear, the use of this technique for assessing calcification rates in corals is not recommended without further investigations.
    Keywords: Alkalinity, total; Alkalinity, total, standard deviation; Animalia; Aragonite saturation state; Aragonite saturation state, standard deviation; Benthic animals; Bicarbonate ion; Bicarbonate ion, standard deviation; Bottles or small containers/Aquaria (〈20 L); Calcification/Dissolution; Calcification rate, standard error; Calcification rate of calcium carbonate; Calcite saturation state; Calcite saturation state, standard deviation; Calcium; Calcium-45 activity; Calcium-45 activity, standard deviation; Calcium ion, standard deviation; Calculated using seacarb after Nisumaa et al. (2010); Calculated using seacarb after Orr et al. (2018); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Cnidaria; Date/time end; Date/time start; Dry mass; Experiment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Fugacity of carbon dioxide in seawater, standard deviation; Identification; Incubation duration; Laboratory experiment; Laboratory strains; Light; Mass; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Potentiometric; Potentiometric titration; Registration number of species; Salinity; Single species; Size; Species; Stylophora pistillata; Temperature, water; Temperature, water, standard deviation; Treatment; Type; Uniform resource locator/link to reference; δ13C; δ13C, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 2610 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Detección de los géneros de dinoflagelados potencialmente tóxicos Prorocentrum y OstreoPsis en el Banco puntalón, región surcentral de Cuba (2021)
    Details
    Publication Date: 2021-05-19
    Description: Varias especies de dinoflagelados bentónicos son productores de potentes toxinas que pueden tener impactos negativos en la economía y la salud de territorios costeros. En un estudio realizado en una zona de alto riesgo de ciguatera localizada al extremo este del golfo de Batabanó, se determinó la diversidad de especies de Gambierdiscus, organismo productor de ciguatoxinas, sin embargo no se evaluó la pre- sencia y abundancia de otros géneros de dinoflagelados bentónicos potencialmente tóxicos. En el presente estudio se re-analizaron las muestras obtenidas a partir de sustratos artificiales y naturales con el objetivo de estudiar la abundancia de otros géneros de dinoflagelados en el área. Se identificaron los géneros Prorocentrum y Ostreopsis en todos los puntos de muestreo. De forma general se encontró una alta variabilidad de la abundancia de estos géneros entre los sitios y fueron valores superiores con respecto a la abundancia reportada del género Gambierdiscus. Los resultados obtenidos mediante el uso de ambos tipos de sustratos fueron similares, lo cual justifica el uso de sustratos artificiales para la cuantificación de dinoflagelados bentónicos en futuros estudios. Este trabajo contribuye a la información existente sobre la presencia y abundancia de los dinoflagelados bentónicos potencialmente tóxicos en la región surcentral de Cuba y proporciona elementos básicos para la evaluación de riesgo relacionada con los eventos de floraciones tóxicas de estas microalgas.
    Description: Several species of benthic dinoflagellates produce potent toxins that have negative impacts on the economy and human health of coastal zones. In a previous study carried out in a zone known to be prone to ciguatera, located at the eastern end of the Gulf of Batabanó, the species diversity of ciguatoxin producer organism, Gambierdiscus, was deter- mined, however the presence and abundance of other potentially toxic benthic dinoflagellate genera was not considered. In present study, the samples obtained from artificial and natural substrates were re-analyzed to estimate the abundance of other genera of dinoflagellates in the area. The genera Proro- centrum and Ostreopsis were identified at all sampling points. In general, the abundance of these genera showed high variability between sites and were higher compared to the reported abundance of the genus Gambierdiscus. The results obtained by using both types of substrates were similar, which en- courages the use of artificial substrates for quantifying benthic dinoflagellates in future studies. This work contributes to the available information about the presence and abundance of potentially toxic benthic dinoflagellates in the southern central region of Cuba and provides basic elements for risk assessment related to toxic blooms of these microalgae.
    Description: Published
    Description: Refereed
    Keywords: Cuba ; Dinoflagelados bentónicos ; Sustratos artificiales ; Gambierdiscus ; Ostreopsis ; Prorocentrum ; Artificial substrates ; Benthic dinoflagellates
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: pp.1-10
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    PAPER (OA)
  • 3
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    Registro de temperatura superficial del mar (1778-2015) en Orbicella faveolata (Cnidaria: Scleractinia) del arrecife Cayo Santa María, Cuba. (2022)
    Details
    Publication Date: 2022-06-28
    Description: Las señales climáticas preservadas en las bandas de crecimiento del esqueleto de corales masivos ofrecen una perspectiva a largo plazo que permite comprender los cambios de la temperatura superficial del mar a diferentes escalas de tiempo. En el área del mar Caribe y el Golfo de México, especies de corales como Orbicella faveolata, en aguas someras, presentan formas de crecimiento masivo que facilitan el fechado de su esqueleto, lo que ha permitido la realización de estudios paleoambientales en zonas costeras donde los registros instrumentales son escasos y abarcan cortos periodos de tiempo. El propósito de este estudio fue caracterizar los registros geoquímicos en el esqueleto de un coral herma- típico O. faveolata, recolectado en el arrecife de Cayo Santa María, Cuba, y reconstruir la temperatura superficial del mar (TSM), con resolución anual, para los dos últimos siglos. Se obtuvieron registros de 230 años de Li/Ca, Sr/Ca, Mg/Ca, U/Ca, Li/Mg y Sr-U. De los indicadores geoquímicos analizados, el Li/Ca permitió la reconstrucción de la TSM para el área de estudio e indicó un incremento de 0.77 °C en los últimos 50 años. Ade- más, Li/Ca corroboró con buena exactitud los periodos característicos de calentamiento y enfriamiento reportados para el mar Caribe y el Golfo de México desde 1778. Orbicella faveolata demostró contener un buen registro multidecadal de la temperatura anual y de la Variabilidad Multidecadal Atlántica. Los resultados son la primera reconstrucción a largo plazo de la TSM en la zona costera de Cuba y brindan información relevante para comprender el calentamiento global en la región.
    Description: Climatic signals preserved in the skeletal growth bands of massive corals offer a long-term perspective that allows understanding sea surface temperature changes at different time scales. In the Caribbean Sea and the Gulf of Mexico, coral species such as Orbicella faveolata present massive growth forms in shallow waters that facilitate dating of their skeleton, allowing to perform paleoenvironmental studies in coastal areas where instrumental records are scarce and cover short time periods. This study aimed to characterize coral geochem- ical records in the skeleton of a hermatypic coral O. faveolata collected in the Cayo Santa María (Cuba) reef and to reconstruct seawater surface annual temperatures for the last two centuries. Records of 230 years for Li/Ca, Sr/Ca, Mg/Ca, U/ Ca, Li/Mg, and Sr-U were obtained. The Li/Ca indicator al- lowed the reconstruction of SST in the study area from 1778 to 2015, indicating an overall increase of 0.77 °C in the last 50 years. In addition, Li/Ca corroborated with high accuracy the characteristic warming and cooling periods reported for the Caribbean Sea and the Gulf of Mexico since 1778. Orbicella faveolata proved to contain a good multidecadal record of annual temperature and of the Atlantic Multidecadal Variability. These results are the first long-term reconstruction of SST in the Cuban coastal zone and provide relevant information to understand global warming in the Caribbean.
    Description: Published
    Description: Refereed
    Keywords: Orbicella faveolata ; Temperatura superficial del mar ; Li/Ca ; Reconstrucción paleoclimática ; Seawater temperature ; Li/ Ca proxy ; Climate archives ; Paleoclimate reconstruction
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: pp.37-53
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    PAPER (OA)
  • 4
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    Tasas netas de acreción de carbonato de calcio en el complejo de ecosistemas marinos-costeros de la Ensenada Rancho Luna, Cienfuegos, Cuba (2024)
    Details
    Publication Date: 2024-03-08
    Description: Debido a las emisiones cada vez mayores de dióxido de carbono a la atmósfera, la absorción de este gas por el océano se realiza a gran velocidad, provocando un aumento en la acidez del agua de mar. Este proceso, conocido como acidificación oceánica, conlleva a que en muchos organismos calcificadores se reduzca la capacidad de formar sus estructuras de carbonato de calcio. El objetivo de esta investigación fue determinar las tasas netas de acreción de carbonato de calcio (g CaCO3 cm-2 año-1) de taxones de sucesión temprana, en el complejo de ecosistemas marinos-costeros de la Ensenada Rancho Luna, Cienfuegos. Para la cuantificación de la tasas netas de acreción de carbonato de calcio se construyeron 12 dispositivos de muestreo basados en la metodología Vargas-Ángel et al. en el 2015, posicionándose seis de ellos en cada ecosistema estudiado (manglar y arrecife). Los valores medios de netas de acreción de carbonato de calcio fueron de 0.87 ± 0.19 g CaCO3 cm-2 año-1 en el arrecife y 0.59 ± 0.05 g CaCO3 cm-2 año-1 en el manglar. Se identificaron siete taxones, correspondientes a cuatro grupos funcionales de sucesión temprana, el césped (turf), el CaCO3/sedimento, el grupo funcional Sin Calcio y las algas coralinas costrosas. Estas últimas fueron las principales aportadoras de CaCO3, encontrándose principalmente en el arrecife. Se determinó a la magnesita como forma cristalina de CaCO3 dominante, y las algas coralinas costrosas, el grupo de mayor vulnerabilidad ante el efecto de la acidificación oceánica.
    Description: Due to the increasing emissions of carbon dioxide into the atmosphere, the absorption of this gas by the ocean is carried out at great speed, causing an increase in the acidity of seawater. This process, known as ocean acidification, leads to a reduction in the ability of many calcifying organisms to form their calcium carbonate structures. The objective of this research was to determine the net rates of calcium carbonate accretion (g CaCO3 cm-2 yr-1) of early successional taxa, in the marine-coastal ecosystem complex of Ensenada Rancho Luna, Cienfuegos. To quantify the net calcium carbonate accretion rates, 12 sampling devices were built based on the Vargas-Ángel et al. in 2015, positioning six of them in each ecosystem studied (mangrove and reef). The mean values of net calcium carbonate accretion rates were 0.87 ± 0.19 g CaCO3 cm-2 yr-1 in the reef and 0.59 ± 0.05 g CaCO3 cm-2 yr-1 in the mangrove swamp. Seven taxa were identified, corresponding to four early successional functional groups, grass (turf), CaCO3/sediment, Calcium-free functional group, and crusted coralline algae. The latter were the main contributors of CaCO3, being found mainly in the reef. Magnesite was determined as the dominant crystalline form of CaCO3, and crusty coralline algae, the group with the greatest vulnerability to the effect of ocean acidification.
    Description: Published
    Description: Refereed
    Keywords: Calcificación ; Alga coralina costrosa ; Acidificación ; Unidad de acreción ; Arrecife ; Cuba ; Calcification ; Coarse crust algae ; Acidification ; Accretion unit ; Reef
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: 68-79pp.
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    PAPER (OA)
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