Recent changes in sedimentation regime in Cienfuegos Bay, Cuba, as inferred from 210Pb and 137Cs vertical profiles

Alonso-Hernández, Carlos; Díaz-Asencio, Misael; Muñoz-Caravaca, Alain; Delfanti, Roberta; Papucci, C.; Ferretti, O.; Crovato, Cinzia

doi:10.1016/j.csr.2005.08.026

Cited by 51 publications

(29 citation statements)

References 22 publications

(7 reference statements)

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“…Studies in Cienfuegos Bay have been carried out about hydrology (Seisdedo and Muñ oz, 2004;Seisdedo, 2006), sediments (Alonso-Hernandez et al, 2006), circulation (Muñ oz et al, 2008), and benthic communities Pé rez-García et al, 2009). They suggest a relatively complex coastal system with high spatial and temporal variance in natural processes and clearly influenced by human activities.…”

Section: Introductionmentioning

confidence: 99%

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Biodiversity patterns of free-living marine nematodes in a tropical bay: Cienfuegos, Caribbean Sea

Armenteros

Ruiz-Abierno

Fernández-Garcés

et al. 2009

Estuarine, Coastal and Shelf Science

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a b s t r a c tSpatial and temporal biodiversity patterns of free-living marine nematodes were studied in Cienfuegos Bay, a tropical semi-enclosed basin in the Caribbean Sea. Taxonomic (to species level) and functional (biological trait) approaches were applied for describing the assemblage structure and relating it to abiotic environment based on a sampling scheme in six subtidal stations and three months. Biological trait approach added relevant information to species pattern regarding relationships between diversity patterns and the abiotic environment. The most common morphotypes were deposit feeding nematodes, with colonising abilities of 2-3 (in a scale from 1 to 5), tail conical cylindrical or filiforme and body slender; and their abundance were correlated with depth, organic matter and silt/clay fraction. In spite of a high turnover of species, functional diversity of assemblages did not change notably in space and time. A result probably due to sampling of the habitat pool of species and to low heterogeneity of the studied muddy bottoms. Chemical pollution (organic enrichment and heavy metals) and hydrodynamic regime possibly drove the biodiversity patterns. Spatial distribution of assemblages support the existence of two well differentiated basins inside the bay, the northern basin more polluted than the southern one. The low hydrodynamic regime would determine a poor dispersion of nematodes resulting in high spatial variance in the assemblage structure; and also the associated hypoxic conditions and pollutants in sediments can explain the dominance of tolerant nematode species such as Daptonema oxycerca, Sabatieria pulchra, Terschellingia gourbaultae, and Terschellingia longicaudata. A comparison of spatialtemporal patterns of biodiversity between Cienfuegos Bay and other semi-enclosed bays in temperate regions suggests several similarities: nematode assemblages are strongly influenced by anthropogenic disturbance, temporal trends are weak or overridden by spatial ones, and few cosmopolitan genera/ species tolerant to pollution and hypoxic conditions are dominant.

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Section: Introductionmentioning

confidence: 99%

“…) after Alonso-Hernandez et al, 2006). The anthropogenic sources of pollution are mostly located in the northern basin (e.g.…”

mentioning

confidence: 99%

Biodiversity patterns of free-living marine nematodes in a tropical bay: Cienfuegos, Caribbean Sea

Armenteros

Ruiz-Abierno

Fernández-Garcés

et al. 2009

Estuarine, Coastal and Shelf Science

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“…The 210 Pb radioisotope is a member of the 238 U-decay series and may be produced from the decay of 222 Rn in the atmosphere referred to as unsupported/excess 210 Pb or 210 Pb exc Alonso-Hernandez et al, 2006;. The in situ radioactive decay of 226 Ra in the water column also produces 210 Pb referred to as supported 210 Pb or 210 Pb supp (Oldfield and Appleby, 1984;Appleby, 2008;Nehyba et al, 2011;Abril and Brunskill, 2014 Ra and other members of the decay chain preceding it, while the 210 Pb exc represents that part of the measured total 210 Pb specific activity in sediment that exceeds the specific activity in secular equilibrium with 226 Ra (Pfitzner et al, 2004;Hollins et al, 2011).…”

Section: Pb As a Tool For The Quantification Of Sarsmentioning

confidence: 99%

“…In depositional environments, where continuous accumulation of sediments has taken place over a long period of time without any interruption in the sedimentary sequence or mixing, the 210 Pb sediment dating technique has proven useful for quantifying SARs on time scales spanning 100-150 years (Appleby and Oldfield, 1978;Caroll and Lerche, 2003;Alonso-Hernandez et al, 2006;Díaz-Asencio et al, 2011;. Sedimentation in coastal marine harbours is, however, a dynamic process for which relatively large spatial and temporal variations can be expected .…”

Section: Settling Fluxes and Sediment Accumulation Rates By The Combimentioning

confidence: 99%

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Sediments in the Tema Harbour (Ghana): chemical pollution and sedimentation rates

Botwe¹

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Oceanic sediment accumulation rates predicted via machine learning algorithm: towards sediment characterization on a global scale

2020

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Observed vertical sediment accumulation rates (n = 1031) were gathered from ~ 55 years of peer reviewed literature. Original methods of rate calculation include long-term isotope geochronology (14C, 210Pb, and 137Cs), pollen analysis, horizon markers, and box coring. These observations are used to create a database of global, contemporary vertical sediment accumulation rates. Rates were converted to cm year−1, paired with the observation’s longitude and latitude, and placed into a machine learning–based Global Predictive Seabed Model (GPSM). GPSM finds correlations between the data and established global “predictors” (quantities known or estimable everywhere, e.g., distance from coastline and river mouths). The result, using a k-nearest neighbor (k-NN) algorithm, is a 5-arc-minute global map of predicted benthic vertical sediment accumulation rates. The map generated provides a global reference for vertical sedimentation from coastal to abyssal depths. Areas of highest sedimentation, ~ 3–8 cm year−1, are generally river mouth proximal coastal zones draining relatively large areas with high maximum elevations and with wide, shallow continental shelves (e.g., the Gulf of Mexico and the Amazon Delta), with rates falling exponentially towards the deepest parts of the oceans. The exception is Oceania, which displays significant vertical sedimentation over a large area without draining the large drainage basins seen in other regions. Coastal zones with relatively small drainage basins and steep shelves display vertical sedimentation of ~ 1 cm year−1, which is limited to the near shore when compared with shallow, wide margins (e.g., the western coasts of North and South America). Abyssal depth rates are functionally zero at the time scale examined (~ 10−4 cm year−1) and increase one order of magnitude near the Mid-Atlantic Ridge and at the Galapagos Triple Junction.

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Recent changes in sedimentation regime in Cienfuegos Bay, Cuba, as inferred from 210Pb and 137Cs vertical profiles

Cited by 51 publications

References 22 publications

Biodiversity patterns of free-living marine nematodes in a tropical bay: Cienfuegos, Caribbean Sea

Biodiversity patterns of free-living marine nematodes in a tropical bay: Cienfuegos, Caribbean Sea

Sediments in the Tema Harbour (Ghana): chemical pollution and sedimentation rates

Oceanic sediment accumulation rates predicted via machine learning algorithm: towards sediment characterization on a global scale

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