Periodic Frontogenesis in a Region of Freshwater Influence

Estuaries ◽  
1993 ◽  
Vol 16 (1) ◽  
pp. 74 ◽  
Author(s):  
Jonathan Sharples ◽  
John H. Simpson
Keyword(s):  
Freshwater Influence

Tropical versus high latitude freshwater influence on the Atlantic circulation

2006 ◽  
Vol 27 (7-8) ◽  
pp. 715-725 ◽  
Author(s):  
Heiko Goelzer ◽  
Juliette Mignot ◽  
Anders Levermann ◽  
Stefan Rahmstorf
Keyword(s):  
High Latitude ◽  
Freshwater Influence

scholarly journals Processes impacting on stratification in a region of freshwater influence: Application to Liverpool Bay

2009 ◽  
Vol 114 (C11) ◽  
Author(s):  
F. Verspecht ◽  
T. P. Rippeth ◽  
M. J. Howarth ◽  
A. J. Souza ◽  
J. H. Simpson ◽  
...  
Keyword(s):  
Liverpool Bay ◽  
Freshwater Influence

Vadicola aprostatus gen. nov., sp. nov., a marine oligochaete (Tubificidae; Rhyacodrilinae) from British Columbia

1982 ◽  
Vol 60 (12) ◽  
pp. 3232-3236 ◽  
Author(s):  
H. R. Baker
Keyword(s):  
British Columbia ◽  
Ejaculatory Duct ◽  
Coarse Sand ◽  
Prostate Cells ◽  
Freshwater Influence ◽  
Intertidal Habitats

Vadicola aprostatus gen. nov., sp. nov., a marine tubificid (Annelida; Oligochaeta) from intertidal habitats of British Columbia (usually coarse sand without obvious freshwater influence), is characterized by an internal projection in the ejaculatory duct and a lack of prostate cells on the atria. Vadicola aprostatus is placed in the subfamily Rhyacodrilinae.

scholarly journals The impact of storms and stratification on sediment transport in the Rhine region of freshwater influence

2017 ◽  
Vol 122 (5) ◽  
pp. 4456-4477 ◽  
Author(s):  
Raúl P. Flores ◽  
Sabine Rijnsburger ◽  
Alexander R. Horner-Devine ◽  
Alejandro J. Souza ◽  
Julie D. Pietrzak
Keyword(s):  
Sediment Transport ◽  
Freshwater Influence ◽  
The Impact

scholarly journals Characterization of a resilient seagrass meadow during a decline period

2018 ◽  
Vol 82 (1) ◽  
pp. 67 ◽  
Author(s):  
Bárbara Ondiviela ◽  
Lina Fernández ◽  
Araceli Puente ◽  
Gerardo García-Castrillo ◽  
José A. Juanes
Keyword(s):  
Seagrass Meadow ◽  
Large Population ◽  
Sea Surface ◽  
Biological Traits ◽  
Benthic Assemblages ◽  
Biomass Density ◽  
Zostera Noltei ◽  
Poor Understanding ◽  
Freshwater Influence

Seagrasses are globally threatened ecosystems with essential ecological roles. An important limitation in seagrass conservation efforts is the poor understanding of resilient meadows. The present work studies a meadow, which maintained a large population of Zostera marina and Zostera noltei, during the decline of seagrasses in the Bay of Santander (from 1984 to 2000). The work examines resilience parameters related to the biological traits (biomass, density, length and width of the leaves) and to the associated benthic assemblages. The maturity of the meadow and the changing environmental conditions induced by the torrential regime of the Miera River, have likely improved the resistance to the periods of stress. The adaptation to these fluctuating conditions is reflected in a high seasonal and spatial variability in the biomass, density, morphological traits and benthic assemblages. These variations are related to the summer peaks in the PAR, the sea surface temperature and the freshwater influence along the discharge of the Miera River. This work provides the first seagrass data in Cantabria. The data are dated in the early 2000s and constitute a baseline study for the Bay of Biscay.

scholarly journals Current structure in the Rhine region of freshwater influence

1997 ◽  
Vol 55 (2) ◽  
pp. 277-292 ◽  
Author(s):  
A. J. Souza ◽  
J. H. Simpson ◽  
F. Schirmer
Keyword(s):  
Current Structure ◽  
Freshwater Influence

Archaeological Earthen Mound Complex in Patos Lagoon, Southern Brazil: Chronological Model and Freshwater Influence

Radiocarbon ◽  
2017 ◽  
Vol 59 (1) ◽  
pp. 195-214 ◽  
Author(s):  
Rafael G Milheira ◽  
Kita D Macario ◽  
Ingrid S Chanca ◽  
Eduardo Q Alves
Keyword(s):  
Archaeological Sites ◽  
Human Intervention ◽  
Southern Brazil ◽  
Patos Lagoon ◽  
Lagoon System ◽  
Indigenous Groups ◽  
Freshwater Influence ◽  
Intense Activity

AbstractIn the present work, we assess the chronology of archaeological sites known as earthen mounds, commonly found at the Pampas biome, among the lowlands of Brazil, Uruguay, and Argentina. We focused on the Pontal da Barra settlement, which is a testimony of the long-term occupation of indigenous groups in the swamp and wet environment of Patos Lagoon, southern Brazil. A Bayesian chronological model based on the radiocarbon (14C) dating of 17 samples of fish otolith, 5 charcoal fragments, and 2 bones (human and dog) allowed determination of the beginning of the occupation as well as the occupational synchronism of the different mounds. The nature of the samples allows us to study the local 14C reservoir effect through the comparison between the group of marine and terrestrial samples, deriving a reservoir offset value of 63±53 14C yr for this particular area, indicating a strong freshwater influence in the lagoon system. We estimate the start of human intervention in the landscapes of southern Patos Lagoon to be around 2200 cal BP, with the most intense activity between 1800 and 1200 cal BP.

Palynology of the Ordovician Kanosh Shale at Fossil Mountain, Utah

2015 ◽  
Vol 89 (3) ◽  
pp. 424-447 ◽  
Author(s):  
Marco Vecoli ◽  
John H. Beck ◽  
Paul K. Strother
Keyword(s):  
North America ◽  
Shallow Water ◽  
New Taxa ◽  
Middle Ordovician ◽  
Incomplete Knowledge ◽  
Late Cambrian ◽  
Freshwater Influence ◽  
Depositional Setting ◽  
Biological Differences

AbstractPalynomorph assemblages recovered from the Kanosh Shale at Fossil Mountain, Utah, are dominated by operculate acritarchs and cryptospores with minor smaller acritarchs. The present findings add new data to the largely incomplete knowledge of Ordovician acritarch assemblages from Laurentia, up to now known only from very few localities in North America. These populations contain some species in common with acritarchs from the Canning and Georgina basins in Australia and with assemblages from China; they indicate a Middle Ordovician (Dapingian-Darriwilian) age. The assemblage is lacking many typical marine acritarchs of this age, which, in combination with some cryptospores, is probably reflecting the likelihood of freshwater influence in the Kanosh Basin. This observation is congruent with previous interpretations of the depositional setting of the Kanosh Shale as a shallow water lagoon that supported the deposition of carbonate hardgrounds.Four new taxa are described: Busphaeridium vermiculatum n. gen., n. sp.; Digitoglomus minutum n. gen., n. sp.; Turpisphaera heteromorpha n. gen., n. sp.; and Vermimarginata barbata n. gen., n. sp. In addition, the abundance of operculate forms has enabled the revision and a new emendation of the genus Dicommopalla and clarification of the “opalla” complex. We also propose new and revised suprageneric taxa that emphasize inferred biological differences among acritarch genera. The Sphaeromorphitae subgroup is emended to include forms lacking sculptural elements. Two new informal subgroups are proposed: the Superornamenti and the Operculate Acritarchs. Cryptospores are abundant throughout the sections studied and they appear to be more closely related to the late Cambrian Agamachates Taylor and Strother than to Darriwilian and younger Ordovician cryptospores from Gondwana.

scholarly journals Tracing latitudinal gradient, river discharge and water masses along the subtropical South American coast using benthic Foraminifera assemblages

2012 ◽  
Vol 72 (3 suppl) ◽  
pp. 723-759 ◽  
Author(s):  
PPB Eichler ◽  
AR Rodrigues ◽  
BB Eichler ◽  
ES Braga ◽  
EJD Campos
Keyword(s):  
Benthic Foraminifera ◽  
River Discharge ◽  
Latitudinal Gradient ◽  
South American ◽  
Shelf Water ◽  
Silicate Concentration ◽  
Tropical Water ◽  
Freshwater Influence ◽  
Antarctic Shelf ◽  
High Silicate

More than 30% of Buccella peruviana (D'Orbigny), Globocassidulina crassa porrecta (Earland & Heron-Allen), Cibicides mackannai (Galloway & Wissler) and C. refulgens (Montfort) indicate the presence of cold Sub Antarctic Shelf Water in winter, from 33.5 to 38.3º S, deeper than 100 m, in the southern part of the study area. In summer, the abundance of this association decreases to less than 15% around 37.5-38.9º S where two species (Globocassidulina subglobosa (Brady), Uvigerina peregrina (Cushman) take over. G. subglobosa, U. peregrina, and Hanzawaia boueana (D'Orbigny) are found at 27-33º S in both seasons in less than 55 m deep in the northern part, and are linked with warm Subtropical Shelf Water and Tropical Water. Freshwater influence was signalized by high silicate concentration and by the presence of Pseudononion atlanticum (Cushman), Bolivina striatula (Cushman), Buliminella elegantissima (D'Orbigny), Bulimina elongata (D'Orbigny), Elphidium excavatum (Terquem), E. poeyanum (D'Orbigny), Ammobaculites exiguus (Cushman & Brönnimann), Arenoparrella mexicana (Kornfeld), Gaudryina exillis (Cushman & Brönnimann), Textularia earlandi (Parker) and thecamoebians in four sectors of the shelf. The presence of Bulimina marginata (D'Orbigny) between 34.1-32.8º S in the winter and 34.2-32.7º S in the summer indicates that the influence of the Subtropical Shelf Front on the sediment does not change seasonally, otherwise, the presence of Angulogerina angulosa (Williamson) in the winter, only in Mar del Plata (38.9º S), show that Malvinas currents are not influencing the sediment in the summer.

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