Groundwater geochemistry of the Yucatan Peninsula, Mexico: Constraints on stratigraphy and hydrogeology

Perry, Eugene C.; Paytan, Adina; Pedersen, Bianca; Velazquez-Oliman, Guadalupe

doi:10.1016/j.jhydrol.2008.12.026

Cited by 103 publications

(102 citation statements)

References 25 publications

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“…Specifically, sites characterized by sulfate addition from input of seawater into the sediment (cores in Group-4) were found primarily near the mouth of both lagoons where low methane was associated with near-zero sulfate depletion. Negative sulfate depletion (Group-3), on the other hand, which indicates the presence of porewater that is enriched in sulfate relative to chloride, was seen primarily in the middle zone of Celestún Lagoon where groundwater springs rich in sulfate due to anhydrite dissolution are present, as reported by Perry et al (2002Perry et al ( , 2009. Positive sulfate depletion profiles co-occurring with methane (Groups 1 and 2) were seen throughout the lagoons but mostly at sites in the inner zone of both lagoons, suggesting significant sulfate reduction at rates higher than the replenishment from sulfate rich groundwater or from the overlying seawater and a source of methane to the shallow sections of the sediment.…”

Section: Co-existence Of Methane and Sulfate In Sedimentssupporting

confidence: 53%

Methane and sulfate dynamics in sediments from mangrove-dominated tropical coastal lagoons, Yucatán, Mexico

et al. 2016

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Abstract. Porewater profiles in sediment cores from mangrove-dominated coastal lagoons (Celestún and Chelem) on the Yucatán Peninsula, Mexico, reveal the widespread coexistence of dissolved methane and sulfate. This observation is interesting since dissolved methane in porewaters is typically oxidized anaerobically by sulfate. To explain the observations we used a numerical transport-reaction model that was constrained by the field observations. The model suggests that methane in the upper sediments is produced in the sulfate reduction zone at rates ranging between 0.012 and 31 mmol m −2 d −1 , concurrent with sulfate reduction rates between 1.1 and 24 mmol SO 2− 4 m −2 d −1 . These processes are supported by high organic matter content in the sediment and the use of non-competitive substrates by methanogenic microorganisms. Indeed sediment slurry incubation experiments show that non-competitive substrates such as trimethylamine (TMA) and methanol can be utilized for microbial methanogenesis at the study sites. The model also indicates that a significant fraction of methane is transported to the sulfate reduction zone from deeper zones within the sedimentary column by rising bubbles and gas dissolution. The shallow depths of methane production and the fast rising methane gas bubbles reduce the likelihood for oxidation, thereby allowing a large fraction of the methane formed in the sediments to escape to the overlying water column.

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Section: Co-existence Of Methane and Sulfate In Sedimentssupporting

confidence: 53%

Methane and sulfate dynamics in sediments from mangrove-dominated tropical coastal lagoons, Yucatán, Mexico

et al. 2016

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“…Additionally, a Cl -gradient extends from southeast to northwest providing generally higher chloride contents (Perry et al, 2009). Concentration gradients of SO4 2-and Cl -in Florida occur from inland to coastal areas as well as with depth (Sacks et al, 1995), explaining the relatively higher amount of chloride and sulfate.…”

Section: +mentioning

confidence: 96%

“…pathway for a broad region extending along the eastern coast and from east to west in the southern part (Perry et al, 2009). …”

Section: +mentioning

confidence: 99%

Impact of climate and hydrochemistry on shape variation – a case study on Neotropical cytheroidean Ostracoda

Wrozyna¹,

Neubauer²,

Meyer³

et al. 2017

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Abstract. How environmental change affects a species' phenotype is crucial not only for taxonomy and biodiversity assessments but also for their application as (paleo-)ecological indicators. Previous investigations addressing the impact of climate and hydrochemical regime on ostracod valve morphology have yielded quite contrasting results. Frequently identified ecological factors influencing carapace shape are salinity, cation and sulphate concentrations and alkalinity. Here, we present a thorough approach integrating data from carapace outline and surface details of the ubiquitous Neotropical cytheroidean 15 ostracod species Cytheridella ilosvayi, as well as several climatic and hydrochemical variables, in order to investigate a potential link between morphology and environmental conditions. A previous study lately demonstrated considerable biogeographical variation in valve morphology among Floridian, Mexican and Brazilian populations of this species. We hypothesize that the climatic differences between the regions it inhabits and associated differences in hydrochemical regimes have influenced valve morphology and eventually led to biogeographically distinctive groups. Generalized least-squares 20Procrustes Analyses based on outline and structural features were applied to left and right valves of adult females and males.The analyses identified relative carapace length and shape symmetry as most important morphological characteristics representing shape change across all datasets. Two-block partial least-squares analyses and multiple regressions indicate strong relationships between morphological and environmental variables, specifically with temperature seasonality, annual precipitation and chloride and sulphate concentrations. We hypothesize that increased temperature seasonality slowed down 25 growth rates during colder months, potentially triggering the development of shortened valves with well-developed brood pouches. Differences in chloride and sulphate concentrations, related to fluctuations in precipitation, are considered to affect valve development via controlling osmoregulation and carapace calcification. These factors represent hitherto unknown drivers for ostracod ecophenotypy and emphasise that environmental predictors for morphological variability are not consistent across non-marine ostracods. 30Biogeosciences Discuss., https://doi

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“…En la península de Yucatán no hay ríos superficiales que aporten material terrígeno al mar, pero se reconocen flujos laminares subterráneos a través de las estructuras cársticas (Perry et al 2009, Cabadas-Báez et al 2010, Solleiro-Rebolledo et al 2011. La zona costera al norte de la península conforma una planicie que comprende desde las localidades de Celestún en el oeste a Cabo Catoche al este, y se caracteriza por ser una franja estrecha de depósitos marinos recientes de origen carbonatado biogénico y un litoral de acumulación (Lugo-Hubp et al 1992.…”

Section: áRea De Estudiounclassified

Análisis espacial y temporal de campos de dunas submarinas en la costa de Yucatán, México

Cuevas¹,

Liceaga-Correa²,

Arellano-Méndez³

et al. 2013

Rev. biol. mar. oceanogr.

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Groundwater geochemistry of the Yucatan Peninsula, Mexico: Constraints on stratigraphy and hydrogeology

Cited by 103 publications

References 25 publications

Methane and sulfate dynamics in sediments from mangrove-dominated tropical coastal lagoons, Yucatán, Mexico

Methane and sulfate dynamics in sediments from mangrove-dominated tropical coastal lagoons, Yucatán, Mexico

Impact of climate and hydrochemistry on shape variation – a case study on Neotropical cytheroidean Ostracoda

Análisis espacial y temporal de campos de dunas submarinas en la costa de Yucatán, México

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