Biogeography of Iberian Atlantic Neogene marginelliform gastropods (Marginellidae, Cystiscidae): global change and transatlantic colonization

2011 ◽  
Vol 85 (6) ◽  
pp. 1052-1066 ◽  
Author(s):  
Carlos Marques Da Silva ◽  
Bernard Landau ◽  
Rafael La Perna
Keyword(s):  
West Africa ◽  
Sea Water ◽  
Atlantic Coast ◽  
Central American ◽  
Marine Gastropods ◽  
High Productivity ◽  
Complex Process ◽  
Central American Seaway ◽  
Central Portugal ◽  
The Caribbean

The Marginellidae Fleming and the Cystiscidae Stimpson, herein collectively referred to as marginelliform gastropods, are convergent families of thermophilic marine gastropods. Shallow-water marginelliform gastropods are found in the Ibero-Moroccan Gulf and Mediterranean, diversity rapidly increasing towards tropical West Africa. Surprisingly, in the tropical and subtropical European Miocene fossil record, marginelliform genera of tropical affinity such asPersiculaSchumacher andPrunumHerrmannsen, occurring today in West Africa, are altogether missing. Others, such asMarginellaLamarck, are present only in the southwestern Iberian and Mediterranean Neogene record. This work describes the marginelliform gastropods from the Atlantic Iberian Neogene. Ten species are recorded, of which three are new,Persicula mikhailovaen. sp.,Gibberula costaen. sp., andGibberula brebionin. sp. This study shows thatGibberulaSwainson andVolvarinaHinds have been present in Europe since the Eocene.Marginellamay have originated in southern Africa and migrated north to Europe in the Miocene, never extending further north than west central Portugal.PersiculaandPrunumprobably originated in the Caribbean and migrated east during the Pliocene, following closure of the Central American Seaway. The colonization of the Pliocene European Atlantic coast by gastropods of these genera was selective, only where high sea-water temperature and high productivity were combined. These findings suggest that post-Messinian recolonization of the Mediterranean during the Pliocene was a complex process, involving colonization by groups originating in various regions of the Atlantic, including Europe, Africa and the Americas.

Changes in bivalve functional and assemblage ecology in response to environmental change in the Caribbean Neogene

Paleobiology ◽  
2012 ◽  
Vol 38 (4) ◽  
pp. 509-524 ◽  
Author(s):  
Jill S. Leonard-Pingel ◽  
Jeremy B. C. Jackson ◽  
Aaron O'Dea
Keyword(s):  
Functional Groups ◽  
Relative Abundance ◽  
Benthic Communities ◽  
Central American ◽  
Carbonate Content ◽  
The Past ◽  
Central American Seaway ◽  
The Caribbean ◽  
Response To Environmental Change ◽  
Deposit Feeding

We documented changes in the relative abundance of bivalve genera and functional groups in the southwest Caribbean over the past 11 Myr to determine their response to oceanographic changes associated with the closure of the Central American Seaway ca. 3.5 Ma. Quantitative bulk samples from 29 localities yielded 106,000 specimens in 145 genera. All genera were assigned to functional groups based on diet, relationship to the substrate, and mobility. Ordinations of assemblages based on quantitative data for functional groups demonstrated strong shifts in community structure, with a stark contrast between assemblages older than 5 Ma and those younger than 3.5 Ma. These changes are primarily due to an increase in the abundance of attached epifaunal bivalves (e.g., Chama, Arcopsis, and Barbatia) and a decrease in infaunal bivalves (e.g., Varicorbula and Caryocorbula). Taxa associated with seagrasses, including deposit-feeding and chemosymbiotic bivalves (e.g., Lucina), also increased in relative abundance compared to suspension feeders. The composition of bivalve assemblages is correlated with the carbonate content of sediments and the percentage of skeletal biomass that is coral. Our results strongly support the hypothesis that increases in the extent of coral reefs and Thalassia communities were important drivers of biologic turnover in Neogene Caribbean benthic communities.

FLOW REVERSAL IN THE CENTRAL AMERICAN SEAWAY DURING OR AFTER THE OLIGOCENE MIOCENE TRANSITION

2017 ◽  
Author(s):  
Andrew Jeffrey Fraass ◽  
◽  
R. Mark Leckie ◽  
Christopher M. Lowery ◽  
Robert DeConto
Keyword(s):  
Flow Reversal ◽  
Central American ◽  
Central American Seaway

scholarly journals Influence of the Central American Seaway and Drake Passage on ocean circulation and neodymium isotopes: A model study

2014 ◽  
Vol 29 (12) ◽  
pp. 1214-1237 ◽  
Author(s):  
Patrik L. Pfister ◽  
Thomas F. Stocker ◽  
Johannes Rempfer ◽  
Stefan P. Ritz
Keyword(s):  
Ocean Circulation ◽  
Drake Passage ◽  
Central American ◽  
Neodymium Isotopes ◽  
Model Study ◽  
Central American Seaway

Identification of Tropical Cyclones’ Critical Positions Associated with Extreme Precipitation Events in Central America

2021 ◽  
Author(s):  
Hugo G. Hidalgo ◽  
Eric J. Alfaro ◽  
Franklin Hernández-Castro ◽  
Paula M. Pérez-Briceño
Keyword(s):  
Central America ◽  
Tropical Cyclones ◽  
Critical Path ◽  
Central American ◽  
Pacific Basin ◽  
Extreme Precipitation Events ◽  
The Pacific ◽  
The Caribbean ◽  
Indirect Impacts ◽  
Precipitation Events

<p>Tropical cyclones are one of the most important causes of disasters in Central America. Using historical (1970–2010) tracks of cyclones in the Caribbean and Pacific basin, we identify critical path locations where these low-pressure systems cause the highest number of floods in a set of 88 precipitation stations in the region. Results show that tropical cyclones from the Caribbean and Pacific basin produce a large number of indirect impacts on the Pacific slope of the Central American isthmus. Although the direct impact of a tropical cyclone usually results in devastation in the affected region, the indirect effects are more common and sometimes equally severe. In fact, the storm does not need to be an intense hurricane to cause considerable impacts and damage. The location of even a lower intensity storm in critical positions of the oceanic basin can result in destructive indirect impacts in Central America. The identification of critical positions can be used for emergency agencies in the region to issue alerts of possible flooding and catastrophic events.</p>

Alteration mineralogy of Cretaceous basalt from ODP Site 1001, Leg 165 (Caribbean Sea)

Clay Minerals ◽  
2000 ◽  
Vol 35 (4) ◽  
pp. 719-733 ◽  
Author(s):  
T. Clayton ◽  
R. B. Pearce
Keyword(s):  
Sea Water ◽  
Caribbean Sea ◽  
Large Igneous Province ◽  
Reducing Conditions ◽  
Igneous Province ◽  
High Fluid ◽  
Alteration Processes ◽  
Fe Oxyhydroxides ◽  
The Caribbean ◽  
And Diffusion

AbstractSecondary clay minerals observed in the two uppermost basalt lava flows at ODP Site 1001, in the Caribbean Sea, drilled from the large igneous province of Cretaceous age, result from low-temperature alteration processes. Alteration mainly proceeds by circulation and diffusion of sea water. Six different types of clay mineral assemblage were recognized. Initial alteration with oxygenated sea water involves Fe and K fixation, creating visible oxidation halos parallel to the sides of cracks and fissures. A saponite/ beidellite mixture, interstratified smectite-glauconite, interstratified glauconite-nontronite and Fe oxyhydroxides are obtained depending on the distance from fluid conduits. The presence of beidellite may be due to enhanced Al mobilization resulting from high fluid flux. These early minerals are cross-cut by thin veins of pure celadonite or glauconite with further vesicle infill. Late-stage alteration is typified by the formation of saponite and takes place under closed reducing conditions resulting from deposition of the sedimentary overburden.

scholarly journals Observation and modeling of a historic African dust intrusion into the Caribbean Basin and the southern U.S. in June 2020

2021 ◽  
Author(s):  
Hongbin Yu ◽  
Qian Tan ◽  
Lillian Zhou ◽  
Yaping Zhou ◽  
Huisheng Bian ◽  
...  
Keyword(s):  
Air Quality ◽  
West Africa ◽  
Transport Model ◽  
Satellite Observations ◽  
Moist Convection ◽  
Caribbean Basin ◽  
Dust Emissions ◽  
African Dust ◽  
The Caribbean ◽  
The U.S

Abstract. This study characterizes a massive African dust intrusion into the Caribbean Basin and southern U.S. in June 2020, which is nicknamed the Godzilla dust plume, using a comprehensive set of satellite and ground-based observations (including MODIS, CALIOP, SEVIRI, AERONET, and EPA Air Quality network) and the NASA GEOS global aerosol transport model. The MODIS data record registered this massive dust intrusion event as the most intense episode over the past two decades. During this event, the aerosol optical depth observed by AERONET and MODIS peaked at 3.5 off the coast of West Africa and 1.8 in the Caribbean Basin. CALIOP observations show that the top of dust plume reached altitudes of 6–8 km in West Africa and descended to about 4 km altitude over the Caribbean Basin and 2 km over the U.S. Gulf coast. The dust plume degraded the air quality in Puerto Rico to the hazardous level, with maximum daily PM10 concentration of 453 μg m−3 recorded on June 23. The dust intrusion into the U.S. raised the PM2.5 concentration on June 27 to a level exceeding the EPA air quality standard in about 40 % of the stations in the southern U.S. Satellite observations reveal that dust emissions from convection-generated haboobs and other sources in West Africa were large albeit not extreme on a daily basis. However, the anomalous strength and northern shift of the North Atlantic Subtropical High (NASH) together with the Azores low formed a closed circulation pattern that allowed for accumulation of the dust near the African coast for about four days. When the NASH was weakened and wandered back to south, the dust outflow region was dominated by a strong African Easterly Jet that rapidly transported the accumulated dust from the coastal region toward the Caribbean Basin, resulting in the record-breaking African dust intrusion. In comparison to satellite observations, the GEOS model well reproduced the MODIS observed tracks of the meandering dust plume as it was carried by the wind systems. However, the model substantially underestimated dust emissions from haboobs and did not lift up enough dust to the middle troposphere for ensuing long-range transport. Consequently, the model largely missed the satellite-observed elevated dust plume along the cross-ocean track and underestimated the dust intrusion into the Caribbean Basin by a factor of more than 4. Modeling improvements need to focus on developing more realistic representations of moist convection, haboobs, and the vertical transport of dust.

scholarly journals Book Review: Field Recordings of Black Singers and Musicians: An Annotated Discography of Artists from West Africa, the Caribbean and the Eastern and Southern United States, 1901–1943

2019 ◽  
Vol 58 (3) ◽  
pp. 194
Author(s):  
Molly Molloy
Keyword(s):  
United States ◽  
African American ◽  
West Africa ◽  
Southern United States ◽  
Sound Recording ◽  
African Music ◽  
Field Recordings ◽  
The Caribbean

This last work of author/compiler Craig Martin Gibbs joins his other unique discographies from the same publisher—Black Recording Artists, 1877–1926: An Annotated Discography (2012) and Calypso and Other Music of Trinidad, 1912–1962: An Annotated Discography (2015)—to provide detailed access to the legacy of African American and African music from the earliest years of sound recording. As noted in the front matter, Craig Martin Gibbs died in October 2017.

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