Spatial variability in the diversity and structure of faunal assemblages associated with kelp holdfasts (Laminaria hyperborea) in the northeast Atlantic

Samples representing the post-Eemian cool interval (approx 110,000 yr BP) were taken from 15 cores on the eastern flank of the mid-Atlantic Ridge from 42°N to 61°N lat. The floral-faunal assemblages in these samples characterize the surface paleooceanography which we consider a possible analog to the cooling expected to follow the present warm interval. The derived paleooceanographic map indicates at least a 16° lat southward displacement of cooled water masses from today. The present position of the Transitional water mass which gives N. Europe its equitable climate was then occupied by Subpolar water while the Polar Front extended south of Iceland. The result was a drop in annual temperature of the NE Atlantic surface water by at least 5°C.

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Environmental factors influencing primary productivity of the forest-forming kelp Laminaria hyperborea in the northeast Atlantic

Scientific Reports ◽

10.1038/s41598-020-69238-x ◽

2020 ◽

Vol 10 (1) ◽

Cited By ~ 3

Author(s):

Dan A. Smale ◽

Albert Pessarrodona ◽

Nathan King ◽

Michael T. Burrows ◽

Anna Yunnie ◽

...

Keyword(s):

Environmental Factors ◽

Primary Productivity ◽

Laminaria Hyperborea ◽

Northeast Atlantic ◽

Factors Influencing

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Seasonal and spatial variability of the CO2 system parameters in the Northeast Atlantic based on measurements from a surface ocean observation platform.

10.5194/egusphere-egu21-12710 ◽

2021 ◽

Author(s):

David Curbelo Hernández ◽

Melchor González Dávila ◽

Aridane González González ◽

David González Santana ◽

Juana Magdalena Santana Casiano

Keyword(s):

Spatial Variability ◽

Continental Shelf ◽

Inorganic Carbon ◽

Coastal Upwelling ◽

Seasonal Temperature ◽

Entire Area ◽

Northeast Atlantic ◽

System Parameters ◽

The North ◽

Effect Ratio

The seasonal and spatial variability of the CO2 system parameters and CO2 air-sea exchange was studied in the Northeast Atlantic Ocean between the northwest African coastal upwelling and the oligotrophic open-ocean waters of the North Atlantic subtropical gyre. Data was collected aboard a volunteer observing ship (VOS) from February 2019 to February 2020. The seasonal and spatial variability of CO2 fugacity in seawater (fCO2,sw) was strongly driven by the seasonal temperature variation, which increased with latitude and was lower throughout the year in coastal regions where the upwelling and offshore transport was more intense. The thermal to biological effect ratio (T/B) was approximately 2, with minimum values along the African coastline related to higher biological activity in the upwelled waters. The fCO2,sw increased from winter to summer by 11.84 &#177; 0.28 &#181;atm&#186;C-1 on the inter-island routes and by 11.71 &#177; 0.25 &#181;atm&#186;C-1 along the northwest African continental shelf. The seasonality of total inorganic carbon (CT) normalized to constant salinity of 36.7 (NCT) was studied throughout the region. The effect of biological processes and calcification/dissolution on NCT between February and October represented >90% of the reduction of inorganic carbon while air-sea exchange described <6%. The seasonality of air-sea CO2 exchange was controlled by temperature. The surface waters of the entire region acted as a CO2 sink during the cold months and as a CO2 source during the warm months. The Canary basin acted as a net sink of -0.26 &#177; 0.04 molC m-2 yr-1. The northwest African continental shelf behaved as a stronger sink at -0.48 &#177; 0.09 molC m-2 yr-1. The calculated average CO2 flux for the entire area was -2.65 &#177; 0.44 TgCO2 yr-1 (-0.72 &#177; 0.12 TgC yr-1).

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Temporal and spatial variability of biogenic particles fluxes during the JGOFS northeast Atlantic process studies at 47°N, 20°W

Deep Sea Research Part I Oceanographic Research Papers ◽

10.1016/0967-0637(94)90065-5 ◽

1994 ◽

Vol 41 (11-12) ◽

pp. 1617-1642 ◽

Cited By ~ 126

Author(s):

Philip P. Newton ◽

Richard S. Lampitt ◽

Timothy D. Jickells ◽

Penny King ◽

Clare Boutle

Keyword(s):

Spatial Variability ◽

Northeast Atlantic ◽

Temporal And Spatial Variability ◽

Process Studies ◽

Temporal And Spatial

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Biodiversity of Kelp Forests and Coralline Algae Habitats in Southwestern Greenland

Diversity ◽

10.3390/d10040117 ◽

2018 ◽

Vol 10 (4) ◽

pp. 117 ◽

Cited By ~ 5

Author(s):

Kathryn Schoenrock ◽

Johanne Vad ◽

Arley Muth ◽

Danni Pearce ◽

Brice Rea ◽

...

Keyword(s):

Life History ◽

Coralline Algae ◽

Kelp Forests ◽

Crustose Coralline Algae ◽

Marine Communities ◽

Faunal Assemblages ◽

Diverse Communities ◽

History Of ◽

Rapid Environmental Change ◽

Kelp Holdfasts

All marine communities in Greenland are experiencing rapid environmental change, and to understand the effects on those structured by seaweeds, baseline records are vital. The kelp and coralline algae habitats along Greenland’s coastlines are rarely studied, and we fill this knowledge gap for the area around Nuuk, west Greenland. Using subtidal swath surveys, photo-quadrats, and grab samples, we characterised the diversity of floral and faunal assemblages in kelp forests and coralline algae beds. The most abundant herbivore assemblages and the most diverse communities occur in the interstitial habitats of rhodolith beds. In kelp forests, species diversity is higher in epi-benthic (photo-quadrat) and mid-water (swath) surveys. These habitats are not mutually exclusive; Agarum clathratum is prominent in coralline algal habitats, while crustose coralline algae cover the bedrock under kelp holdfasts. Overall, the suite of surveys used capture the diverse communities within kelp forests and coralline algae in Greenland and their differing role in the life history of the inhabitants. Furthermore, coralline algae beds are an important carbonate store, with CaCO3 concentrations ranging from 28.06 to 103.73 g·m−3. Our research sets the baseline for continued investigations and monitoring of these important habitats and their supported fisheries.

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