Regression modeling of the North East Atlantic Spring Bloom suggests previously unrecognized biological roles for V and Mo

2005 ◽

Vol 85 (4) ◽

pp. 741-753 ◽

Cited By ~ 12

Author(s):

E.S. Fileman ◽

R.J.G. Leakey

Keyword(s):

Developmental Stages ◽

Spring Bloom ◽

Mixed Layer Depth ◽

Grazing Impact ◽

East Atlantic ◽

North East ◽

The North ◽

Protozoan Community ◽

Community Growth ◽

The Uk

Microzooplankton community composition, abundance, biomass and grazing impact were assessed, along with measurements of ciliate growth and mortality, during the onset of the spring bloom in the north-east Atlantic. The study was undertaken as part of the UK Biogeochemical Ocean Flux Study during 1 May to 15 June 1990. The microzooplankton community was composed of protozoans and metazoan developmental stages with respective mixed-layer depth integrated biomass values ranging from 127 to 638 and 74 to 394 mg C m−2. High numbers of aloricate ciliates (up to 35,000 cells l−1) dominated the microzooplankton community during early May prior to the onset of the spring bloom. Ciliate abundance then declined rapidly during mid-May with community growth rates ranging from −0·71 to 0·23 d−1. High abundances of metazoplankton (up to 400 l−1) were also recorded at this time and may have contributed to the decline in ciliate numbers. In late May and early June the protozoan community comprised a more even mix of dinoflagellates, tintinnids and aloricate ciliates. Phytoplankton mortality rates, measured using a dilution technique, ranged from 0·2 to 0·5 d−1. The microzooplankton consumed 8 to 44 μg C l−1 d−1, equivalent to between 16 and 40% of the chlorophyll biomass and 38 and 154% of primary production. These high rates of herbivory reflect the predominance of small (<5 μm in length) phytoplankton cells present throughout the first half of the study and support previous studies demonstrating the microzooplankton to be the main grazers of phytoplankton in the north-east Atlantic. However, there is also evidence that a disparity between predator and prey may have prevented a response by the microzooplankton to rapid increases in phytoplankton biomass and production during the spring bloom.

Download Full-text

Distribution of calcifying and silicifying phytoplankton in relation to environmental and biogeochemical parameters during the late stages of the 2005 North East Atlantic Spring Bloom

Biogeosciences ◽

10.5194/bg-6-2155-2009 ◽

2009 ◽

Vol 6 (10) ◽

pp. 2155-2179 ◽

Cited By ~ 36

Author(s):

K. Leblanc ◽

C. E. Hare ◽

Y. Feng ◽

G. M. Berg ◽

G. R. DiTullio ◽

...

Keyword(s):

Surface Layer ◽

Biogenic Silica ◽

Spring Bloom ◽

Diatom Bloom ◽

East Atlantic ◽

Nitrogen And Phosphorus ◽

North East ◽

The North ◽

Biogeochemical Parameters ◽

Late Stages

Abstract. The late stage of the North East Atlantic (NEA) spring bloom was investigated during June 2005 along a transect section from 45 to 66° N between 15 and 20° W in order to characterize the contribution of siliceous and calcareous phytoplankton groups and describe their distribution in relation to environmental factors. We measured several biogeochemical parameters such as nutrients, surface trace metals, algal pigments, biogenic silica (BSi), particulate inorganic carbon (PIC) or calcium carbonate, particulate organic carbon, nitrogen and phosphorus (POC, PON and POP, respectively), as well as transparent exopolymer particles (TEP). Results were compared with other studies undertaken in this area since the JGOFS NABE program. Characteristics of the spring bloom generally agreed well with the accepted scenario for the development of the autotrophic community. The NEA seasonal diatom bloom was in the late stages when we sampled the area and diatoms were constrained to the northern part of our transect, over the Icelandic Basin (IB) and Icelandic Shelf (IS). Coccolithophores dominated the phytoplankton community, with a large distribution over the Rockall-Hatton Plateau (RHP) and IB. The Porcupine Abyssal Plain (PAP) region at the southern end of our transect was the region with the lowest biomass, as demonstrated by very low Chla concentrations and a community dominated by picophytoplankton. Early depletion of dissolved silicic acid (DSi) and increased stratification of the surface layer most likely triggered the end of the diatom bloom, leading to coccolithophore dominance. The chronic Si deficiency observed in the NEA could be linked to moderate Fe limitation, which increases the efficiency of the Si pump. TEP closely mirrored the distribution of both biogenic silica at depth and prymnesiophytes in the surface layer suggesting the sedimentation of the diatom bloom in the form of aggregates, but the relative contribution of diatoms and coccolithophores to carbon export in this area still needs to be resolved.

Download Full-text

Thrust–wrench interference tectonics in the Gulf of Cadiz (Africa–Iberia plate boundary in the North-East Atlantic): Insights from analog models

Marine Geology ◽

10.1016/j.margeo.2011.09.014 ◽

2011 ◽

Vol 289 (1-4) ◽

pp. 135-149 ◽

Cited By ~ 35

Author(s):

João C. Duarte ◽

Filipe M. Rosas ◽

Pedro Terrinha ◽

Marc-André Gutscher ◽

Jacques Malavieille ◽

...

Keyword(s):

Plate Boundary ◽

Gulf Of Cadiz ◽

East Atlantic ◽

North East ◽

The North ◽

Gulf Of Cádiz ◽

Analog Models

Download Full-text

Corrigendum to “Bisphenol A and its analogs in muscle and liver of fish from the North East Atlantic Ocean in relation to microplastic contamination. Exposure and risk to human consumers” [J. Hazard. Mater. 393 (2020) 122419]

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2021.125654 ◽

2021 ◽

Vol 415 ◽

pp. 125654

Author(s):

Luís Gabriel A. Barboza ◽

Sara C. Cunha ◽

Carolina Monteiro ◽

José O. Fernandes ◽

Lúcia Guilhermino

Keyword(s):

Atlantic Ocean ◽

Bisphenol A ◽

East Atlantic ◽

North East ◽

The North

Download Full-text

A COMPARISON OF DEPRESSIONS OVER EUROPE AND THE NORTH-EAST ATLANTIC

Weather ◽

10.1002/j.1477-8696.1971.tb04191.x ◽

1971 ◽

Vol 26 (5) ◽

pp. 210-216 ◽

Cited By ~ 1

Author(s):

I. Dodos

Keyword(s):

East Atlantic ◽

North East ◽

The North

Download Full-text

Exceptional influx of oceanic species into the North Sea late 1997

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315498000885 ◽

1999 ◽

Vol 79 (4) ◽

pp. 737-739 ◽

Cited By ~ 30

Author(s):

M. Edwards ◽

A.W.G. John ◽

H.G. Hunt ◽

J.A. Lindley

Keyword(s):

North Sea ◽

Indicator Species ◽

Climatic Conditions ◽

Historical Evidence ◽

East Atlantic ◽

North East ◽

The North ◽

The North Sea ◽

Oceanic Species

Continuous Plankton Recorder records from the North Sea and north-east Atlantic from September 1997 to March 1998 indicate an exceptional influx of oceanic indicator species into the North Sea. These inflow events, according to historical evidence, have only occurred sporadically during this century. This exceptional inflow and previous inflow events are discussed in relation to their similarity in terms of their physical and climatic conditions.

Download Full-text