30 years of temporal variability of temperature and currents below the main thermocline between 1980–2009 in the subtropical Northeast Atlantic (Kiel 276, 33∘N, 22∘W)

2021 ◽  
Vol 217 ◽  
pp. 103517
Author(s):  
H.C. Frazão ◽  
R.D. Prien ◽  
T.J. Müller ◽  
D.E. Schulz-Bull ◽  
J.J. Waniek
Keyword(s):  
Temporal Variability ◽  
Northeast Atlantic ◽  
Main Thermocline

Temporal variability in phytodetritus and megabenthic activity at the seabed in the deep Northeast Atlantic

2001 ◽  
Vol 50 (1-4) ◽  
pp. 349-368 ◽  
Author(s):  
Brian J Bett ◽  
M.Gabriella Malzone ◽  
Bhavani E Narayanaswamy ◽  
Benjamin D Wigham
Keyword(s):  
Temporal Variability ◽  
Northeast Atlantic

Water mass transport and ventilation in the Northeast Atlantic derived from tracer data

1988 ◽  
Vol 325 (1583) ◽  
pp. 63-69 ◽  
Keyword(s):  
Mass Transport ◽  
Data Base ◽  
Water Mass ◽  
The South ◽  
Northeast Atlantic ◽  
Main Thermocline

A large 3 He and tritium data base collected in the Northeast Atlantic since 1977 allows construction of extensive tracer distributions on isopycnal surfaces in the main thermocline. A distinct southward increase in tritium— 3 He age is observed that depicts the outcrop boundaries and allows one to quantify the interior transport. This transport is directed towards the south.

Fine-scale taxonomic and temporal variability in the energy density of invertebrate prey of juvenile Chinook salmon Oncorhynchus tshawytscha

2020 ◽  
Vol 655 ◽  
pp. 185-198
Author(s):  
J Weil ◽  
WDP Duguid ◽  
F Juanes
Keyword(s):  
Energy Density ◽  
Chinook Salmon ◽  
Temporal Variability ◽  
Energy Content ◽  
Single Point ◽  
Single Species ◽  
Fine Scale ◽  
Temporal Differences ◽  
Juvenile Chinook Salmon ◽  
Juvenile Chinook

Variation in the energy content of prey can drive the diet choice, growth and ultimate survival of consumers. In Pacific salmon species, obtaining sufficient energy for rapid growth during early marine residence is hypothesized to reduce the risk of size-selective mortality. In order to determine the energetic benefit of feeding choices for individuals, accurate estimates of energy density (ED) across prey groups are required. Frequently, a single species is assumed to be representative of a larger taxonomic group or related species. Further, single-point estimates are often assumed to be representative of a group across seasons, despite temporal variability. To test the validity of these practices, we sampled zooplankton prey of juvenile Chinook salmon to investigate fine-scale taxonomic and temporal differences in ED. Using a recently developed model to estimate the ED of organisms using percent ash-free dry weight, we compared energy content of several groups that are typically grouped together in growth studies. Decapod megalopae were more energy rich than zoeae and showed family-level variability in ED. Amphipods showed significant species-level variability in ED. Temporal differences were observed, but patterns were not consistent among groups. Bioenergetic model simulations showed that growth rate of juvenile Chinook salmon was almost identical when prey ED values were calculated on a fine scale or on a taxon-averaged coarse scale. However, single-species representative calculations of prey ED yielded highly variable output in growth depending on the representative species used. These results suggest that the latter approach may yield significantly biased results.

First Confirmed Record of Northern Bottlenose Whale (Hyperoodon ampullatus) in Madeira Archipelago, Northeast Atlantic

2017 ◽  
Vol 43 (5) ◽  
pp. 474-478 ◽  
Author(s):  
Rita Ferreira ◽  
Filipe Alves ◽  
Claudia Gomes ◽  
Daniel Jardim ◽  
Judith Kok ◽  
...  
Keyword(s):  
Northeast Atlantic ◽  
Madeira Archipelago ◽  
Hyperoodon Ampullatus
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