Water quality in the eastern karst region of the Yucatan Peninsula: nutrients and stable nitrogen isotopes in turtle grass, Thalassia testudinum

Camacho-Cruz, Karla; Ortiz-Hernández, Ma. Concepción; Sánchez, Alberto; Carrillo, Laura; Navarrete, Alberto de Jesús

doi:10.1007/s11356-019-04757-3

Cited by 30 publications

(6 citation statements)

References 50 publications

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“…The dissolved oxygen values in the back reefs of our study areas were lower than the standard values for coral reefs dominated by algae (7.9 ± 0.5 mg l −1 ) according to Haas et al (2010) and values reported by Camacho-Cruz et al (2019) for Xahuayxol and Mahahual. This supports ideas from Kendrick et al (2000) and Haas et al (2010), who argue that benthic communities linked to reef lagoons are very susceptible to environmental degradation.…”

Section: Discussioncontrasting

confidence: 70%

Sargassumblooms in the Caribbean alter the trophic structure of the sea urchinDiadema antillarum

Cabañillas-Terán

Arana

Ruiz-Zárate

et al. 2019

PeerJ

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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 δ15N 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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Section: Discussioncontrasting

confidence: 70%

Sargassumblooms in the Caribbean alter the trophic structure of the sea urchinDiadema antillarum

Cabañillas-Terán

Arana

Ruiz-Zárate

et al. 2019

PeerJ

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“…Las fracturas en las rocas son elementos que controlan el posicionamiento de las formas kársticas, principalmente las cavernas y/o conductos subterráneos, debido a que en ellas se produce mayor intensidad de la disolución de la roca (Lugo-Hubp et al 1992). La península de Yucatán se ve influenciada por la actividad neotectónica, lo que provoca la diferenciación de bloques de alta porosidad, que propicia la formación de un sistema de fallas orientadas principalmente al N-S y NE-SO, orientación en la que se encuentra la fractura de Holbox y la de Xelha (Fragoso -Servón et al 2016, Camacho-Cruz et al 2019. Esto puede explicar la orientación de las depresiones y esta estrictamente regida por un control tectónico derivado de fallas.…”

Section: Discussionunclassified

Caracterización morfométrica de depresiones kársticas: zona costera nororiente de la Península de Yucatán, México

Rodríguez-Castillo

Martínez

Uhu-Yam

et al. 2022

Ecosist. Recur. Agropec.

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Estudiar el relieve a través del análisis morfológico permite tipificar formas, elementos y estructuras del relieve kárstico que auxilia en la determinación de la génesis, evolución y dinámica geomorfológica. La implementación de herramientas con nuevos métodos y tecnologías ayuda a desarrollar estudios de mayor precisión en zonas con bajo contraste altitudinal. El objetivo del presente estudio es analizar y clasificar las depresiones kársticas en la región costera del nororiente de la península de Yucatán. El relieve kárstico se analizó a partir de dos fuentes de datos: a) un mosaico de datos LiDAR (light detection and ranging) y b) un mosaico de datos AsterGDEM (Advanced Spaceborne Thermal Emission and Reflection Radiomete Global Digital Elevation Model). Estos se acoplaron generando insumos altimétricos y modelos topográficos base. Posteriormente, se generaron curvas de nivel diferenciando depresiones con una profundidad mínima de 1m; después, se procesaron y clasificaron las depresiones aplicando un análisis de mediciones morfométricas, tipología morfológica del perfil e índice de elongación. Se identificaron 10 672 depresiones donde, el 67% corresponde a depresiones tipo V, 23% tipo U y 10% tipo caja; respecto al índice de elongación, 18% son dolinas, 42% dolinas-úvalas, 13% úvalas y el 27% poljes, siendo las úvalas y poljes las que poseen mayor complejidad, debido al control estructural del sistema de fallas Holbox y Tikul, con orientación principal de NE7°SW y secundario SE83°NW, que pone en evidencia en carácter disyuntivo estructural. Finalmente, se presenta un inventario de depresiones kársticas, sirviendo de base para la gestión del territorio kárstico costero.

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“…Thus, groundwater is the only freshwater source in the state (Aranda-Cirerol et al 2011 ). This karst aquifer hosts large amounts of groundwater resources that contain precious and highly vulnerable environments such as sinkholes, mangroves, and seagrass (Bauer-Gottwein et al 2011 , Camacho-Cruz et al 2020 , Cejudo et al 2020 ). It is one of the world’s unique regions concerning the character and manifestation of karst processes (Lebedeva et al 2017 ), since it is dominated by limestones and dolomites with abundant inundated cave systems and geological formations produced by rock dissolution (Scholz et al 1995 ).…”

Section: Introductionmentioning

confidence: 99%

Use of Microbiological and Chemical Data to Evaluate the Effects of Tourism on Water Quality in Karstic Cenotes in Yucatan, Mexico

Árcega-Cabrera

León-Aguirre

Soberanis

et al. 2023

Bull Environ Contam Toxicol

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Cenotes are spectacular karst formations in Yucatan, Mexico, often used for recreation. However, their impact on water quality has yet to be explored in detail. Therefore, during Easter, water samples were collected from four cenotes to identify variations in water quality associated with the presence of tourists. PCO of water quality, before (PH) and during Holy Week (HW) in 2019, explained 49.02% of the total variation. The indicators contributing to the first principal coordinate’s variation were Sr, K, sulfate, and chloride (0.89). Whereas, alkalinity, temperature, conductivity, nitrate, and ORP contributed to the second PC. PERMANOVA indicated a significant interaction between “cenote” and “condition” factors, and post hoc paired comparisons indicated significant differences between PH and HW conditions. Significant correlations varied among the four cenotes as the result of hydrogeological differences. Whereas, numbers of visitors were correlated with at least one fecal-matter indicator, demonstrating anthropogenic influence on the cenotes’ water quality.

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Water quality in the eastern karst region of the Yucatan Peninsula: nutrients and stable nitrogen isotopes in turtle grass, Thalassia testudinum

Cited by 30 publications

References 50 publications

Sargassumblooms in the Caribbean alter the trophic structure of the sea urchinDiadema antillarum

Sargassumblooms in the Caribbean alter the trophic structure of the sea urchinDiadema antillarum

Caracterización morfométrica de depresiones kársticas: zona costera nororiente de la Península de Yucatán, México

Use of Microbiological and Chemical Data to Evaluate the Effects of Tourism on Water Quality in Karstic Cenotes in Yucatan, Mexico

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