Relationships between environmental features, distribution and abundance of the Argentine anchovy, Engraulis anchoita, on the South West Atlantic Continental Shelf

2016 ◽  
Vol 173 ◽  
pp. 229-235 ◽  
Author(s):  
Paloma Lumi Costa ◽  
Pedro Ramiro Castillo Valderrama ◽  
Lauro Antônio Saint Pastous Madureira
Keyword(s):  
Continental Shelf ◽  
The South ◽  
Environmental Features ◽  
South West

scholarly journals On the occurrence and behaviour of two little-known barnacles, Hexelasma hirsutum and Verruca recta, from the continental slope

1958 ◽  
Vol 37 (3) ◽  
pp. 633-647 ◽  
Author(s):  
A. J. ◽  
Eve C. Southward ◽  
L. H. N. Cooper
Keyword(s):  
Continental Shelf ◽  
Continental Slope ◽  
British Isles ◽  
The South ◽  
South West

The fauna of the continental shelf and slope between Ireland and Spain has been described by Le Danois (1948), but very little faunistic work has been carried out in the area recently. Since R.V. ‘Sarsia’ was brought into service at Plymouth there have been several opportunities of investigating that part of the slope lying to the south-west of the British Isles. It has been found that, in addition to beds of coral, quite extensive exposures of rocks, stones and gravel occur between 200 and 1000 fathoms. There is a rich epifauna in this area and barnacles are one of the dominant groups.

Spatial and temporal changes in biomass, production and assemblage structure of mesozooplanktonic copepods in the tropical south-west Atlantic Ocean

2014 ◽  
Vol 95 (3) ◽  
pp. 483-496 ◽  
Author(s):  
C.O. Dias ◽  
A.V. Araujo ◽  
S.C. Vianna ◽  
L.F. Loureiro Fernandes ◽  
R. Paranhos ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Continental Shelf ◽  
Continental Slope ◽  
Rainy Season ◽  
Temporal Variations ◽  
Dry Season ◽  
Subsurface Water ◽  
Tropical Region ◽  
The South ◽  
South West

We examined the spatial and temporal variations of coastal and oceanic epipelagic copepods (rainy–dry seasons of 2009) in a tropical area of the south-west Atlantic. Zooplankton samples were obtained at 48 stations along six transects perpendicular to the coast, in the subsurface water between the 25 and 3000 m isobaths, by horizontal hauls using a Multinet. Abundance (42–64,753 ind. m−3), biomass (0.08–113 mg C m−3) and daily copepod production (0.17–163.20 mg C m−3 d−1) showed longitudinal and latitudinal variability. The highest values were observed over the southern continental shelf during the dry season. Temoridae, Undinula vulgaris and Paracalanus quasimodo dominated the biomass and daily copepod production during the rainy season; while Calanoides carinatus, Calanopia americana, Clausocalanidae, Temoridae, Paracalanidae and Subeucalanidae dominated during the dry season. The copepod assemblages formed four different groups: rainy season–continental shelf (1), dry season–continental shelf (2), rainy season–continental slope (3) and dry season–continental slope (4). Temperature, salinity, chlorophyll-a and suspended particulate matter explained 45% of the productivity distribution of the dominant copepod species. This study is the first attempt to examine the biomass and daily copepod production in oceanic waters in the south-west Atlantic Ocean, and it showed that copepod biomass and production in a tropical region can be relatively high compared with other regions of the world's oceans.

Multigrain seabed sediment transport modelling for the south-west Australian Shelf

2009 ◽  
Vol 60 (7) ◽  
pp. 774 ◽  
Author(s):  
F. Li ◽  
C. M. Griffiths ◽  
C. P. Dyt ◽  
P. Weill ◽  
M. Feng ◽  
...  
Keyword(s):  
Climate Change ◽  
Sediment Transport ◽  
Continental Shelf ◽  
Morphological Changes ◽  
High Energy ◽  
Sediment Supply ◽  
Climate Change Scenarios ◽  
The South ◽  
South West

With increasing concerns about climate change and sea-level rise, there is a need for a comprehensive understanding of the sedimentary processes involved in the erosion, transport and deposition of sediment on the continental shelf. In the present paper, long-term and large-scale seabed morphological changes on the south-west Australian continental shelf were investigated by a comprehensive sediment transport model, Sedsim. The investigated area covers the continental shelf and abyssal basins of the south-western region. The regional seabed is sensitive to environmental forces and sediment supply, and most terrigenous sediment carried down by major rivers is trapped in inland lakes or estuaries. Only a small fraction of fine-grain sediment reaches the continental shelf. The simulation has also confirmed that the Leeuwin Current and high-energy waves play the most important roles in regional long-term seabed evolution. Although the numerical implementation only approximates some forcing and responses, it represents a significant step forward in understanding the nature of potential long-term seabed change as a response to possible climate change scenarios. The 50-year forecast on the seabed morphological changes provides a reference for the management of coastal and offshore resources, as well as infrastructure, in a sustainable way.

Middle and Late Iron Age Occupation at Cadnam Farm, Alton, Hampshire

2018 ◽  
Vol 73 (1) ◽  
pp. 110-136
Author(s):  
Oliver Good ◽  
Richard Massey
Keyword(s):  
Iron Age ◽  
The South ◽  
Late Iron Age ◽  
South West ◽  
Middle Iron Age

Three individual areas, totalling 0.55ha, were excavated at the Cadnam Farm site, following evaluation. Area 1 contained a D-shaped enclosure of Middle Iron Age date, associated with the remains of a roundhouse, and a ditched drove-way. Other features included refuse pits, a four-post structure and a small post-built structure of circular plan. Area 2 contained the superimposed foundation gullies of two Middle Iron Age roundhouses, adjacent to a probable third example. Area 3 contained a small number of Middle Iron Age pits, together with undated, post-built structures of probable Middle Iron Age date, including a roundhouse and four and six-post structures. Two large boundary ditches extended from the south-west corner of Area 3, and were interpreted as the funnelled entrance of a drove-way. These contained both domestic and industrial refuse of the late Iron Age date in their fills.

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