Facies patterns of a tropical heterozoan carbonate platform under eutrophic conditions: the Banc d’Arguin, Mauritania

Klicpera, André; Michel, Julien; Westphal, Hildegard

doi:10.1007/s10347-014-0421-5

Cited by 21 publications

(18 citation statements)

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“…James, ; Reijmer et al ., ). The shallow rocky reefs of the Galápagos Archipelago are an example of equatorial heterozoan grain associations; however, these are also known from Mauritania (Michel et al ., ; Klicpera et al ., ), Panama (D'Croz et al ., ; Reijmer et al ., ), Nicaragua Rise, Caribbean (Hallock, ), the Gulf of California (Halfar et al ., , ) and Southeast Asia (Wilson & Vecsei, ). The influences of temperature and nutrients on the carbonate end‐member are often complicated.…”

Section: Discussionmentioning

confidence: 99%

“…Tropical carbonate factories are complex systems and are not only known for their oligotrophic photozoan end‐members, but also for heterozoan warm‐water carbonates as a result of elevated trophic conditions irrespective of temperature (Westphal et al ., ). Modern comparisons in the Gulf of California, Mexico (Halfar et al ., ), Panama (Reijmer et al ., ) and Mauritania (Klicpera et al ., ) have shown the importance of nutrient levels in shaping photozoan, heterozoan and transitional carbonate communities. Shallow‐water heterozoan carbonate factories can occur at all latitudes and can be the outcome of either cold‐water oligotrophic, cold‐water eutrophic or warm‐water mesotrophic to eutrophic settings (James, ).…”

Section: Introductionmentioning

confidence: 99%

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Heterozoan carbonates from the equatorial rocky reefs of the Galápagos Archipelago

et al. 2016

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Strongly influenced by seasonal and interannual (i.e. El Niño-Southern Oscillation) upwelling, the equatorial setting of the Gal apagos Archipelago is divided into well-defined temperature, nutrient and calcium carbonate saturation (Ω aragonite ) regions. To understand the relationship between oceanographic properties and sediment grain associations, grain size, carbonate content and components from sea floor surface samples were analysed, representing the main geographical regions of the Gal apagos Archipelago. The shallow-water rocky reefs of the Gal apagos Archipelago are characterized by mixed carbonate-siliciclastic slightly gravelly sands. Despite minor differences in carbonate content, major differences exist in the distribution and composition of key carbonate producing biota. Halimeda is absent and benthic foraminifera occur in extremely low abundance. The western side of the Gal apagos Archipelago is strongly influenced by nutrient-rich, low-Ω aragonite , subtropical water, which generates a heterozoan carbonate biofacies in a tropical realm resembling cold-water counterparts (i.e. serpulid, echinoderm, gastropod, barnacle and bryozoan-rich facies). The Central East region is composed of a transitional-heterozoan biofacies. Biofacies observed in the northern region have an increased occurrence of tropical corals, albeit with a minor overall contribution to the carbonate components. Although the temperature gradient would allow for a broader distribution of photozoan biofacies, the increased nutrient concentration and related reduced light penetration from the upwelled waters favour heterozoan carbonate factories, mimicking cool-water, deeper or higher latitude environments. The recent sedimentary record of the Gal apagos Archipelago presents a range of tropical heterozoan carbonate communities, responding to more than simply latitude or temperature but a much more complex mixture of physical, evolutionary and geological processes.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heterozoan carbonates from the equatorial rocky reefs of the Galápagos Archipelago

et al. 2016

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“…The Guitar Formation carbonates are comparable to the shallow marine sediments of Golfe d'Arguin, Mauritania, in having a complete absence of green algae that are typical components of oligotrophic tropical settings (Westphal et al 2010;Klicpera et al 2015). However, the Mauritania sediments are characterised by the complete absence of zooxanthellate corals and sparse distribution of foraminifera, whereas the Guitar Formation shows local abundance and scattered presence of corals.…”

Section: Palaeoecological Factorsmentioning

confidence: 96%

“…Comparison of the Guitar Formation with other carbonate systems worldwide Tropical heterozoan assemblages have been recorded from numerous modern as well as ancient carbonate systems across the globe, like the NW African shelf of Northern Mauritania (Westphal et al 2010;Michel et al 2011;Klicpera et al 2015), the Yucatan shelf off Mexico (Logan et al 1969;Westphal et al 2010), the Nicaragua Rise (Hine et al 1987;Hallock et al 1988), the West Florida Shelf (Westphal et al 2010), the Gulf of California, Mexico Hetzinger et al 2006), the Mediterranean region (Brandano and Corda 2002;Samankassou 2002;Bouillon et al 2004;Pomar et al 2004;Brandano et al 2009) and SE Asia (Wilson 2002(Wilson , 2008Wilson and Vecsei 2005). The Guitar Formation carbonates are comparable to the shallow marine sediments of Golfe d'Arguin, Mauritania, in having a complete absence of green algae that are typical components of oligotrophic tropical settings (Westphal et al 2010;Klicpera et al 2015).…”

Section: Palaeoecological Factorsmentioning

confidence: 99%

“…between 30°N and 30°S). Heterozoan assemblages are reported from a wide array of locations influenced by different climatic regimes (Samankassou 2002;Pomar et al 2004;Braga et al 2006;Brandano et al 2009;Westphal et al 2010;Klicpera et al 2015). The tropical photozoan and non-tropical heterozoan carbonates have been subject to a wide range of studies to define a useful framework to interpret the sedimentary record on the basis of grain associations (Lees and Buller 1972;Lees 1975;James 1997).…”

Section: Introductionmentioning

confidence: 99%

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Upper Pliocene heterozoan assemblage from the Guitar Formation of Car Nicobar Island, India: palaeoecological implications and taphonomic signatures

Sarkar¹

2015

Palaeobio Palaeoenv

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The upper Pliocene Guitar Formation outcrops in Car Nicobar Island, a near-pristine locality of the AndamanNicobar Group of Islands, India. Tropical-subtropical photozoan and cool-water heterozoan assemblages have been broadly studied up to now, but little is known about the tropical heterozoans that require deeper analysis. The major objectives of the current assessment pertaining to the Guitar Formation are evaluation of biotic diversity, palaeoecological processes governing the depositional environment and general taphonomic signatures. The carbonate sediments rich in algal and benthic foraminiferal assemblages are dominated by lithophylloids and nummulitids, respectively. Secondary biotic constituents are corals, barnacles, bryozoans, echinoderms, molluscs and gastropods. In particular, a reefal environment is indicated after a thorough examination of the heterozoan assemblages including relative abundance of the algalforaminiferal taxa. The results indicate that carbonate sedimentation occurred in warm, tropical waters under mesooligotrophic conditions and shallow to mildly deeper bathymetric levels ranging close to or below the fair-weather wave base.

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Coastal protection assessment: a tradeoff between ecological, social, and economic issues

et al. 2021

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Marine coastal ecosystems are crucial to human populations in reducing disaster risk. Least Developed Countries are particularly vulnerable to the effects of climate change, such as sea-level rise and storm surges. The Mauritanian coast, West Africa, ranks among the most vulnerable worldwide to sealevel rise, and coastal communities in the National Park of Banc d'Arguin (PNBA) are particularly at risk. Here, we assessed the service of coastal protection in PNBA by (1) mapping the coastal marine ecosystems with Sentinel-2 imagery and determining their spatial wave height attenuation rates; (2) assessing the vulnerability of villages and natural habitats to coastal hazard risk; and (3) assessing the applicability of coastal protection measures in the PNBA. We found that a total of 83% of the populated coastline presents a moderate to high risk of flooding and erosion, with Iwik and R'Gueiba being the most threatened villages in the PNBA. As for the ecological risk, two low-elevated islands, which support breeding colonies of birds, are particularly vulnerable to sea-level rise. However, in other areas, the rupture in the dune cord created new lagoons that present valuable ecological and economic interests like the Lagoon of Bellaat. Improving the comprehension of wave attenuation provided by coastal habitats, combined with identifying the vulnerability and applicability of coastal protection measures, is essential for achieving the Sendai Framework for Disaster Risk Reduction goals. In the PNBA, relocation of identified villages at risk is probably the best cost-effective solution with the least disturbance to both breeding and wintering birds. Protection of coastal ecosystems will also ensure a continued provision of other ecosystem services, including food supply for sea dependent populations, and contribute to achieving the Paris Agreement and Sustainable Development Goals.

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Facies patterns of a tropical heterozoan carbonate platform under eutrophic conditions: the Banc d’Arguin, Mauritania

Cited by 21 publications

References 86 publications

Heterozoan carbonates from the equatorial rocky reefs of the Galápagos Archipelago

Heterozoan carbonates from the equatorial rocky reefs of the Galápagos Archipelago

Upper Pliocene heterozoan assemblage from the Guitar Formation of Car Nicobar Island, India: palaeoecological implications and taphonomic signatures

Coastal protection assessment: a tradeoff between ecological, social, and economic issues

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