Mesopelagic Fishes from the Gulf of Maine and the Adjacent Continental Slope

1973 ◽  
Vol 30 (1) ◽  
pp. 134-137 ◽  
Author(s):  
John A. Musick
Keyword(s):  
Continental Slope ◽  
Gulf Of Maine ◽  
Cold Water ◽  
Otter Trawl ◽  
Midwater Trawl ◽  
First Time ◽  
Trawl Catches

Otter-trawl records and midwater-trawl catches suggested that some mesopelagic fishes are permanent members of the midwater fauna of the Gulf of Maine rather than strays. Benthosema glaciale, Ceratoscopelus maderensis, Myctophum punctatum, and Maurolicus muelleri, cold water or ubiquitous species, occur in the Gulf throughout the year, and warmwater species derived from adjacent Slope Water offshore were captured in the Gulf during the summer and fall. Nine species of mesopelagic fishes are here recorded from the Gulf for the first time.

scholarly journals EQUINOIDEOS (ECHINODERMATA: ECHINOIDEA) COLECTADOS EN LA FRANJA SUPERIOR DEL TALUD CONTINENTAL DEL CARIBE COLOMBIANO

2016 ◽  
Vol 31 ◽  
Author(s):  
Giomar Helena Borrero Pérez ◽  
Milena Benavides Serrato ◽  
Óscar D. Solano ◽  
Gabriel R. Navas
Keyword(s):  
Continental Slope ◽  
Identification Keys ◽  
The Caribbean ◽  
First Time

Between 1998 and 1999 the expedition INVEMAR-MACROFAUNA 1 investigated the upper continental slope of the Caribbean off Colombia at depths ranging from 200 to 500 m. The collection of echinoids comprised 714 individuals belonging to 7 orders, 10 families, 14 genera and 15 species. Stylocidaris lineata, Trigonocidaris albida, Echinocyamus grandiporus, Palaeobrissus hilgardi and Archaeopneustes hystrix are recorded for the first time in the Colombian Caribbean. Descriptions and identification keys are provided.

scholarly journals LOS CAMARONES DE LA FAMILIA CRANGONIDAE DE LA FRANJA SUPERIOR DEL TALUD CONTINENTAL DEL MAR CARIBE COLOMBIANO

2016 ◽  
Vol 31 ◽  
Author(s):  
Norella Cruz ◽  
Adriana Bermúdez ◽  
Néstor Hernando Campos ◽  
Gabriel Navas
Keyword(s):  
Continental Slope ◽  
Geographic Distribution ◽  
Caribbean Sea ◽  
Marine Fauna ◽  
Diagnostic Characters ◽  
Morphological Variations ◽  
Identification Keys ◽  
First Time

Four surveys were conducted between October 1998 and April 1999 along the upper section of the Colombian Caribbean Sea continental slope with the aim of compliting marine fauna inventories. During the surveys (INVEMAR-MACROFAUNA 1) individuals of the shrimps Parapontocaris caribbaea, P. vicina, Prionocrangon pectinata and Parapontophilus gracilis (Decapoda: Crangonidae) were found and are herein registered for the first time in Colombian waters. Along with the description of the collected material and reference to site of collection, identification keys, diagnostic characters, diagrams and bathimetric and geographic distribution are included as well as comments on morphological variations of the individuals.

scholarly journals Resilience of cold water aquaculture: a review of likely scenarios as climate changes in the Gulf of Maine

2020 ◽  
Vol 13 (1) ◽  
pp. 460-503 ◽  
Author(s):  
Ian R. Bricknell ◽  
Sean D. Birkel ◽  
Susan H. Brawley ◽  
Tyler Van Kirk ◽  
Heather J. Hamlin ◽  
...  
Keyword(s):  
Climate Changes ◽  
Gulf Of Maine ◽  
Cold Water

Continental slope sedimentation in the Sheepbed Formation (Neoproterozoic, Windermere Supergroup), Mackenzie Mountains, N.W.T.

1996 ◽  
Vol 33 (6) ◽  
pp. 848-862 ◽  
Author(s):  
R. W. Dalrymple ◽  
G. M. Narbonne
Keyword(s):  
Sea Level ◽  
Continental Slope ◽  
Cold Water ◽  
Passive Margin ◽  
Slope Instability ◽  
Fine Grained ◽  
Windermere Supergroup ◽  
Mackenzie Mountains ◽  
Water Depths

The Sheepbed Formation (Ediacaran) is a 1 km thick, siliciclastic unit that overlies glacial deposits of the Ice Brook Formation and is overlain by carbonates of the Gametrail Formation. Observations in the Mackenzie Mountains indicate that the Sheepbed Formation accumulated in water depths of 1–1.5 km on a passive-margin, continental slope. The lower part of the formation consists predominately of dark mudstone. Fine-grained, turbiditic sandstone becomes more abundant upward, as does the scale and abundance of slope-instability indicators. Mesoscale facies successions (i.e., evidence of channels, lobes, and (or) compensation cycles) are developed in the upper half of the formation. The larger-scale changes are interpreted as reflecting a postglacial sea-level rise, followed by a relative fall and an increase in the rate of deposition. Contourites that may have been formed in response to the circulation of deep, cold water occur in the lowstand deposits. Their presence confirms previous speculation that the proto-Pacific Ocean was initiated at the beginning of Windermere deposition (ca. 780 Ma), not at the start of the Cambrian. The paleoflow direction toward the present-day northwest suggests that this part of Laurentia lay in the northern hemisphere. In situ Ediacaran megafossils are preserved on the soles of sandy turbidites; the deep-water setting indicates that these organisms were not photoautotrophs.

Comparative biology of four species of glyphocrangonid and crangonid shrimp from the continental slope of the middle Atlantic Bight

1978 ◽  
Vol 56 (5) ◽  
pp. 1052-1065 ◽  
Author(s):  
Elizabeth Lewis Wenner
Keyword(s):  
Sex Ratio ◽  
Continental Slope ◽  
Gonad Development ◽  
Stomach Contents ◽  
Otter Trawl ◽  
Comparative Biology ◽  
Benthic Organisms ◽  
Middle Atlantic Bight ◽  
Middle Atlantic ◽  
Ovarian Growth

Distribution, reproduction, food, and parasites of glyphocrangonid (Glyphocrangon sculpta and Glyphocrangon longirostris) and crangonid (Sabinea hystrix and Metacrangon jacqueti agassizi) shrimp were studied from otter trawl collections on the continental slope of the middle Atlantic Bight. Glyphocrangon sculpta and G. longirostris were found at depths of 2068–2679 m and 1111–2427 m respectively; S. hystrix was found from 452 to 2100 m and M. j. agassizi occurred from 616 to 1430 m. Among all four species, ovigerous females were significantly larger and more numerous than males. Sex ratio patterns expressed as percent male for depth and size are discussed for these species. Reproduction of all species was asynchronous and year-round; ovigerous females were captured during every month. Ovarian growth was continuous, enabling multiple spawnings of small numbers of large eggs. Stomach contents consisted almost entirely of benthic organisms and sediment, but the majority of stomachs were empty. Epibranchial bopyrid isopods were found on G. sculpta, G. longirostris, and M. j. agassizi. Parasite incidence among the species was low but, when present, retarded gonad development in female hosts.

scholarly journals Monsoonal forcing of cold-water coral growth off southeastern Brazil during the past 160 kyr

2020 ◽  
Vol 17 (23) ◽  
pp. 5883-5908
Author(s):  
André Bahr ◽  
Monika Doubrawa ◽  
Jürgen Titschack ◽  
Gregor Austermann ◽  
Andreas Koutsodendris ◽  
...  
Keyword(s):  
Organic Matter ◽  
Continental Slope ◽  
Deep Water ◽  
Cold Water ◽  
Southeastern Brazil ◽  
Nepheloid Layer ◽  
Saturation State ◽  
The Past ◽  
Water Ecosystems ◽  
The Impact

Abstract. Cold-water corals (CWCs) constitute important deep-water ecosystems that are under increasing environmental pressure due to ocean acidification and global warming. The sensitivity of these deep-water ecosystems to environmental change is demonstrated by abundant paleorecords drilled through CWC mounds that reveal characteristic alterations between rapid formation and dormant or erosive phases. Previous studies have identified several central parameters for driving or inhibiting CWC growth such as food supply, oxygenation, and the carbon saturation state of bottom water, yet there are still large uncertainties about the relative importance of the different environmental parameters. To advance this debate we have performed a multiproxy study on a sediment core retrieved from the 25 m high Bowie Mound, located at 866 m water depth on the continental slope off southeastern Brazil, a structure built up mainly by the CWC Solenosmilia variabilis. Our results indicate a multifactorial control on CWC growth at Bowie Mound during the past ∼ 160 kyr, which reveals distinct formation pulses during northern high-latitude glacial cold events (Heinrich stadials, HSs) largely associated with anomalously strong monsoonal rainfall over the continent. The ensuing enhanced runoff elevated the terrigenous nutrient and organic-matter supply to the continental margin and likely boosted marine productivity. The dispersal of food particles towards the CWC colonies during HSs was facilitated by the highly dynamic hydraulic conditions along the continental slope that prevailed throughout glacial periods. These conditions caused the emplacement of a pronounced nepheloid layer above Bowie Mound, thereby aiding the concentration and along-slope dispersal of organic matter. Our study thus emphasizes the impact of continental climate variability on a highly vulnerable deep-marine ecosystem.

scholarly journals Ring-shaped morphological features and interpreted small seamounts between southern Quebec (Canada) and the New England seamounts (USA) and their possible association with the New England hotspot track

2018 ◽  
pp. 223-265
Author(s):  
Ronald T. Marple ◽  
James D. Hurd, Jr. ◽  
Robert J. Altamura
Keyword(s):  
New England ◽  
Continental Slope ◽  
Gulf Of Maine ◽  
Morphological Features ◽  
Cape Cod ◽  
Digital Elevation ◽  
Igneous Province ◽  
Seamount Chain ◽  
Elevation Model ◽  
Digital Elevation Model Data

 Enhancements of recently available high-resolution multibeam echosounder data from the western Gulf of Maine and Atlantic continental margin and light detection and ranging (LiDAR) and digital elevation model data from southeastern Quebec (Canada) and the northeastern United States have revealed numerous ring-shaped morphological features and interpreted small seamounts between the Monteregian Hills igneous province and the New England seamounts. The morphological features onshore are mainly ring-shaped depressions, several of which surround mapped igneous intrusions in the Monteregian Hills igneous province and White Mountain magma series. Most of the rings offshore are also depressions, although a few rings are curved ridges above the seafloor. The largest ring in the western Gulf of Maine is the 30-km-diameter Tillies ring that lies 20 km east of Cape Ann, MA. Several small (<3 km in diameter) round, flat-topped submerged hills that we interpret to be volcanic necks are also present beneath the western Gulf of Maine. The rings between Cape Cod and the continental slope are more subtle because of thicker sediments and poorer spatial resolution of the sonar data in this area. The southernmost ring-shaped features are located on the continental slope and upper continental rise and coincide with the northwestern end of the New England seamount chain. The concentration of these features between the Monteregian Hills igneous province and the New England seamounts suggests that they are igneous features that may be associated with the New England hotspot track. 

scholarly journals Narcine atzi Carvalho & Randall, 2003 (Pisces: Narcinidae) - an addition to Indian ichthyofauna

2016 ◽  
Vol 63 (4) ◽  
Author(s):  
K. Sujatha ◽  
V. A. Iswarya Deepti ◽  
V. Ravali ◽  
Sneha Jha
Keyword(s):  
Eastern Coast ◽  
Morphometric Characters ◽  
Shrimp Trawl ◽  
Indian Waters ◽  
Length Range ◽  
Central Eastern ◽  
First Time ◽  
Trawl Catches

A species of electric ray of family Narcinidae, Narcine atzi Carvalho & Randall, 2003 has been recorded for the first time from Indian waters. Five specimens of N. atzi in the length range of 343-415 mm (TL) were collected from demersal shrimp trawl catches at Visakhapatnam, central eastern coast of India. The present paper provides description on morphometric characters of the species along with a comparative account on earlier descriptions.

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