Carbonate sediment production in the equatorial continental shelf of South America: Quantifying Halimeda incrassata (Chlorophyta) contributions

2016 ◽  
Vol 72 ◽  
pp. 1-6 ◽  
Author(s):  
Pedro Bastos de Macêdo Carneiro ◽  
Jader Onofre de Morais
Keyword(s):  
South America ◽  
Continental Shelf ◽  
Carbonate Sediment ◽  
Sediment Production

A comparative analysis of the organic and inorganic carbon content of Halimeda and Penicillus (Chlorophyta, Bryopsidales) in a coastal subtropical lagoon

2019 ◽  
Vol 62 (4) ◽  
pp. 323-326
Author(s):  
Danielle Catherine Hatt ◽  
Ligia Collado-Vides
Keyword(s):  
Coastal Waters ◽  
Inorganic Carbon ◽  
Carbonate Sediment ◽  
Term Study ◽  
Sediment Production ◽  
Long Term Study ◽  
Organic And Inorganic Carbon ◽  
Maximum Contribution ◽  
Subtropical Lagoon

Abstract Standing stocks of the calcifying algae, Halimeda and Penicillus, have remained stable over the 10 years surveyed (2007–2017) in Florida Bay (USA), a subtropical lagoon. The maximum contribution of calcium carbonate (CaCO3; 779.75 g m−2) was lower compared to tropical lagoons. Halimeda was more abundant and had higher inorganic:organic carbon ratios compared to Penicillus. The abundance of Penicillus varied across the surveyed sites, Sprigger Bank, Bob Allen Keys, and Duck Key, while its inorganic:organic carbon ratios did not vary significantly. Our long-term study provides a critical baseline that can help understand fluctuations in carbonate sediment production by calcareous algae in subtropical coastal waters.

scholarly journals MOLUSCOS MARINOS DE LA ISLA DE GORGONA (COSTA DEL PACIFICO COLOMBIANO)

2016 ◽  
Vol 14 ◽  
Author(s):  
Rudo Von Cosel
Keyword(s):  
Costa Rica ◽  
South America ◽  
Continental Shelf ◽  
Central America ◽  
Pacific Coast ◽  
Northern Limit ◽  
Marine Mollusk ◽  
Distribution Limit ◽  
Mollusk Species

319 marine mollusk species collected yet on Gorgona Island (Pacific coast of Colombia, Panamic zoogeographic province) by various persons and scientific expeditions are listed. 209 species (65.5%) inhabit the whole province (México to Ecuador or Perú), 21 species (6.6%) are known from the southern part (Central America to Ecuador or Perú) and 4 species (1.3%) have their presently known northern limit in Gorgona and spread south to Ecuador or Peru. 42 species (13.2%) have their presently known southern distribution limit in Gorgona, 14 other species (4.4%) reaching in Gorgona their southernmost point on the continental shelf of South America are also known from Galapagos. 3 species (1.0%) have been collected on the continental shelf only in Gorgona and partly in Costa Rica. The distribution of the remaining 25 species (7-9%) is still not sufficiently known. 119 species from Gorgona have not yet been found on the mainland coast of Colombia. 8 species are amphipacific. The zoogeographic importance of Gorgona Island is based in the fact that the island is the southernmost point on the continental shelf with extensive coraline biotopes within the Panamic-Pacific faunal province.

scholarly journals Paleo American finds from Venezuela: evidence to discuss the spread of Fell Points and the peopling of Northern South America

2016 ◽  
Vol 29 (45) ◽  
pp. 212 ◽  
Author(s):  
Hugo G. Nami
Keyword(s):  
South America ◽  
Continental Shelf ◽  
Additional Data ◽  
Caribbean Sea ◽  
Hunter Gatherers ◽  
Human Dispersal ◽  
Manufacturing Procedure ◽  
Human Colonization ◽  
The Caribbean ◽  
Northern South America

 “Fishtail” or just “Fell” points represent an excellent marker to know and discuss the existence of colonizers hunter-gatherers living in Central and South America during the end of the Pleistocene at about 11000-10000 14C yr BP. Investigations of Venezuelan fishtail points yielded additional data on their manufacturing procedure to help discuss the human colonization of northern South America. The finds from northern Venezuela on the Caribbean Sea yielded a link arguing for the use of the Atlantic slope and the current continental shelf during human dispersal in South America.“Rabo de peixe” ou somente pontas Fell representam um excelente indicador para conhecer e discutir a existência de colonizadores caçadores-coletores que viveram na América Central e do Sul durante o final do Pleistoceno há aproximadamente 11.000-10.000 14C anos AP. Pesquisas com pontas Rabo de peixe da Venezuela proporcionaram dados adicionais sobre o seu processo de fabricação contribuindo na discussão da colonização humana do norte da América do Sul. As descobertas do norte da Venezuela no Mar do Caribe defendem a utilização da vertente Atlântica e da plataforma continental atual durante a dispersão humana na América do Sul.

scholarly journals From platform top to adjacent deep sea: New source-to-sink insights into carbonate sediment production and transfer in the SW Indian Ocean (Glorieuses archipelago)

2020 ◽  
Vol 423 ◽  
pp. 106144
Author(s):  
Stéphan J. Jorry ◽  
Gwenael Jouet ◽  
Evan N. Edinger ◽  
Samuel Toucanne ◽  
John W. Counts ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Deep Sea ◽  
Carbonate Sediment ◽  
Sediment Production ◽  
Source To Sink ◽  
Sw Indian Ocean

Dynamics of carbonate sediment production by Halimeda: implications for reef carbonate budgets

2020 ◽  
Vol 639 ◽  
pp. 91-106
Author(s):  
C Castro-Sanguino ◽  
YM Bozec ◽  
PJ Mumby
Keyword(s):  
Major Contributor ◽  
Indirect Pathway ◽  
Carbonate Sediment ◽  
Carbonate Production ◽  
Sediment Production ◽  
Carbonate Budget ◽  
Shoreline Protection ◽  
Fish Herbivory ◽  
Manipulative Experiments ◽  
Gains And Losses

Reef carbonate production and sediment generation are key processes for coral reef development and shoreline protection. The calcified green alga Halimeda is a major contributor of calcareous sediments, but rates of production and herbivory upon Halimeda are driven by biotic and environmental factors. Consequently, estimating rates of calcium carbonate (CaCO3) production and transformation into sediment requires the integration of Halimeda gains and losses across habitats and seasons, which is rarely considered in carbonate budgets. Using seasonal rates of recruitment, growth, senescence and herbivory derived from observations and manipulative experiments, we developed an individual-based model to quantify the annual cycle of Halimeda carbonate and sediment production at Heron Island, Great Barrier Reef. Halimeda population dynamics were simulated both within and outside branching Acropora canopies, which provide refuge from herbivory. Shelter from herbivory allowed larger Halimeda thalli to grow, leading to higher rates of carbonate accumulation (3.9 and 0.9 kg CaCO3 m-2 yr-1 within and outside Acropora canopies, respectively) and sediment production (2.5 versus 1.0 kg CaCO3 m-2 yr-1, respectively). Overall, 37% of the annual carbonate production was transformed into sediments through senescence (84%) and fish herbivory (16%), with important variations among seasons and habitats. Our model underlines that algal rates of carbonate production are likely to be underestimated if herbivory is not integrated into the carbonate budget, and reveals an important indirect pathway by which structurally complex coral habitats contribute to reef carbonate budgets, suggesting that coral losses due to climate change may lead to further declines in reef sediment production.

scholarly journals CO2 released by carbonate sediment production in some coastal areas may offset the benefits of seagrass “Blue Carbon” storage

2017 ◽  
Vol 63 (1) ◽  
pp. 160-172 ◽  
Author(s):  
Jason L. Howard ◽  
Joel C. Creed ◽  
Mariana V. P. Aguiar ◽  
James W. Fourqurean
Keyword(s):  
Carbon Storage ◽  
Coastal Areas ◽  
Blue Carbon ◽  
Carbonate Sediment ◽  
Sediment Production

Distribution of Lithodes confundens Macpherson, 1988 (Decapoda, Anomura) along the Atlantic continental shelf of southern South America

Crustaceana ◽  
2013 ◽  
Vol 86 (2) ◽  
pp. 246-252 ◽  
Author(s):  
M. Paula Sotelano ◽  
María F. Gowland-Sainz ◽  
Mariano J. Diez ◽  
Gustavo A. Lovrich
Keyword(s):  
South America ◽  
Continental Shelf ◽  
Southern South America

scholarly journals OESbathy version 1.0: a method for reconstructing ocean bathymetry with realistic continental shelf-slope-rise structures

2015 ◽  
Vol 8 (4) ◽  
pp. 3079-3115
Author(s):  
A. Goswami ◽  
P. L. Olson ◽  
L. A. Hinnov ◽  
A. Gnanadesikan
Keyword(s):  
South America ◽  
Continental Shelf ◽  
The Arctic ◽  
Global Ocean ◽  
North Coast ◽  
Sediment Layer ◽  
Passive Margins ◽  
Shelf Slope ◽  
Continental Shelf Slope ◽  
Cooling Model

Abstract. We present a method for reconstructing global ocean bathymetry that uses a plate cooling model for the oceanic lithosphere, the age distribution of the oceanic crust, global oceanic sediment thicknesses, plus shelf-slope-rise structures calibrated at modern active and passive continental margins. Our motivation is to reconstruct realistic ocean bathymetry based on parameterized relationships of present-day variables that can be applied to global oceans in the geologic past, and to isolate locations where anomalous processes such as mantle convection may affect bathymetry. Parameters of the plate cooling model are combined with ocean crustal age to calculate depth-to-basement. To the depth-to-basement we add an isostatically adjusted, multicomponent sediment layer, constrained by sediment thickness in the modern oceans and marginal seas. A continental shelf-slope-rise structure completes the bathymetry reconstruction, extending from the ocean crust to the coastlines. Shelf-slope-rise structures at active and passive margins are parameterized using modern ocean bathymetry at locations where a complete history of seafloor spreading is preserved. This includes the coastal regions of the North, South, and Central Atlantic Ocean, the Southern Ocean between Australia and Antarctica, and the Pacific Ocean off the west coast of South America. The final products are global maps at 0.1° × 0.1° resolution of depth-to-basement, ocean bathymetry with an isostatically adjusted, multicomponent sediment layer, and ocean bathymetry with reconstructed continental shelf-slope-rise structures. Our reconstructed bathymetry agrees with the measured ETOPO1 bathymetry at most passive margins, including the east coast of North America, north coast of the Arabian Sea, and northeast and southeast coasts of South America. There is disagreement at margins with anomalous continental shelf-slope-rise structures, such as around the Arctic Ocean, the Falkland Islands, and Indonesia.

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