Benthic nutrient regeneration as related to primary productivity in the west-Norwegian coastal zone

Ophelia ◽  
1986 ◽  
Vol 26 (1) ◽  
pp. 443-456 ◽  
Author(s):  
Paul Wassmann
Keyword(s):  
Coastal Zone ◽  
Primary Productivity ◽  
Nutrient Regeneration ◽  
The West

The Lake Ontario Life Support System

1987 ◽  
Vol 44 (12) ◽  
pp. 2230-2240 ◽  
Author(s):  
D. R. S. Lean ◽  
H-J. Fricker ◽  
M. N. Charlton ◽  
R. L. Cuhel ◽  
F. R. Pick
Keyword(s):  
Primary Productivity ◽  
Life Support ◽  
Lake Ontario ◽  
Trophic Levels ◽  
Phosphorus Concentration ◽  
Nutrient Regeneration ◽  
Particulate Carbon ◽  
Calcium Carbonate Precipitation ◽  
Mixing Processes ◽  
Aquatic Food

Primary productivity provides most of the energy to support aquatic food chains. The rate is not only influenced by available solar radiation but also by temperature, availability of phosphorus, and the influence of physical mixing processes. The special features of Lake Ontario such as changes in phosphorus concentration, calcium carbonate precipitation, and silica deficiency on primary productivity, concentration of particulate carbon, and chlorophyll are discussed. Our lack of understanding of food chain and nutrient regeneration processes is illustrated through our failure to balance carbon production with losses through zooplankton grazing and sedimentation. It was demonstrated, however, that bacteria are not responsible for nutrient regeneration through "mineralization" but nutrients are effectively recycled in the water column at the second and third trophic levels.

scholarly journals Exploring the use of compound-specific carbon isotopes as a palaeoproductivity proxy off the coast of Adélie Land, East Antarctica

2021 ◽  
Vol 18 (19) ◽  
pp. 5555-5571
Author(s):  
Kate E. Ashley ◽  
Xavier Crosta ◽  
Johan Etourneau ◽  
Philippine Campagne ◽  
Harry Gilchrist ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Carbon Isotopes ◽  
Coastal Zone ◽  
Primary Productivity ◽  
Open Water ◽  
Phytoplankton Productivity ◽  
Antarctic Sea Ice ◽  
Projected Changes ◽  
The Antarctic

Abstract. The Antarctic coastal zone is an area of high primary productivity, particularly within coastal polynyas, where large phytoplankton blooms and drawdown of CO2 occur. Reconstruction of historical primary productivity changes and the associated driving factors could provide baseline insights on the role of these areas as sinks for atmospheric CO2, especially in the context of projected changes in coastal Antarctic sea ice. Here we investigate the potential for using carbon isotopes (δ13C) of fatty acids in marine sediments as a proxy for primary productivity. We use a highly resolved sediment core from off the coast of Adélie Land spanning the last ∼ 400 years and monitor changes in the concentrations and δ13C of fatty acids along with other proxy data from the same core. We discuss the different possible drivers of their variability and argue that C24 fatty acid δ13C predominantly reflects phytoplankton productivity in open-water environments, while C18 fatty acid δ13C reflects productivity in the marginal ice zone. These new proxies have implications for better understanding carbon cycle dynamics in the Antarctica coastal zone in future palaeoclimate studies.

scholarly journals Ocean acidification and calcium carbonate saturation states in the coastal zone of the West Antarctic Peninsula

2017 ◽  
Vol 139 ◽  
pp. 181-194 ◽  
Author(s):  
Elizabeth M. Jones ◽  
Mairi Fenton ◽  
Michael P. Meredith ◽  
Nicola M. Clargo ◽  
Sharyn Ossebaar ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Ocean Acidification ◽  
Coastal Zone ◽  
Antarctic Peninsula ◽  
The West ◽  
West Antarctic ◽  
West Antarctic Peninsula

scholarly journals Ampliación de la distribución de tres carnívoros en el noroeste de México.

2009 ◽  
Vol 13 (1) ◽  
pp. 115
Author(s):  
Horacio V. Barcénas ◽  
Yamel Rubio–Rocha ◽  
Edith Nájera–Solís ◽  
Leonardo J. López Damían ◽  
Rodrigo Medellín Legorreta
Keyword(s):  
Coastal Zone ◽  
Visual Recognition ◽  
Coastal Plains ◽  
The West ◽  
Taxidea Taxus ◽  
Carnivore Species ◽  
Distribution Ranges ◽  
New Localities ◽  
The Many ◽  
Desert Scrub

Abstract: We report new localities in 2006 and 2008 for three carnivore species from sarcocaule and microphythic desert scrub at the Sierra Seri, Sonora and from croplands Norwest Coastal Plains region, Sinaloa, extending their known distribution ranges.  Species were identified through visual recognition of pictures.  The presence of these species can be explained by two different mutually exclusive hypotheses: first, that the species has been historically present and were not recorded earlier; and second, that these species have just recently dispersed into the coastal zone.  We strongly support the first hypothesis.  The relevance of this note stands in the fact that it gives elements to extend the map of distribution for each of these species more than 100 km to the West; this pinpoints the need for continuing conducting biological inventories in the many unexplored areas at Norwest Mexico.Palabras clave: Distribución, Sonora, Sinaloa, Carnivora, Mephitis macroura, Spilogale gracilis, Taxidea taxus.Key words: Distribution, Sonora, Sinaloa, Carnivora, Mephitis macroura, Spilogale gracilis, Taxidea taxus. 

Holocene water mass changes in the Labrador Current

The Holocene ◽  
2019 ◽  
Vol 29 (4) ◽  
pp. 676-690 ◽  
Author(s):  
Annalena Antonia Lochte ◽  
Janne Repschläger ◽  
Marit-Solveig Seidenkrantz ◽  
Markus Kienast ◽  
Thomas Blanz ◽  
...  
Keyword(s):  
Sea Ice ◽  
Primary Productivity ◽  
Atlantic Water ◽  
Water Masses ◽  
Labrador Sea ◽  
The West ◽  
West Greenland ◽  
Labrador Current ◽  
Water Outflow ◽  
Polar Water

The Labrador Current is part of the anticlockwise subpolar gyre and plays a major role in the formation of North Atlantic Deep Water. It is influenced by the West Greenland and Baffin currents supplying warmer Atlantic and cold polar waters, respectively. During the early Holocene, at the final stage of the last deglaciation, meltwater and iceberg discharge caused highly variable conditions in the Labrador Current. In order to assess its sensitivity to such freshening, this study provides a well-resolved Holocene paleoclimatic record from the Labrador Shelf. Based on benthic foraminiferal faunal and alkenone biomarker analyses, we differentiated four distinct climatic periods in the western Labrador Sea. From 8.9 to 8.6 ka BP, the Labrador Shelf was dominated by polar water outflow from Baffin Bay and covered by perennial sea ice. Between 8.6 and 7.4 ka BP, a strong subsurface inflow of warmer Atlantic water masses is ascribed to an intensification and redirection of the West Greenland Current. At 7.4 ka BP, the decreased influence of Atlantic water masses on the Labrador Shelf marks the establishment of winter convection leading to the formation of Labrador Sea Water in the central basin. Concurrently, an intensified polar water outflow through the Canadian Gateways strengthened the inner Labrador Current, and higher primary productivity suggests longer spring blooms because of a shorter sea-ice season during the Holocene Thermal Maximum. In the late Holocene after 3 ka BP, periodic fluctuations of primary productivity may tentatively be correlated with stronger and weaker northwesterly winds.

Hydrography and the distribution of phytoplankton in Killary Harbour: a fjord in western Ireland

1987 ◽  
Vol 67 (2) ◽  
pp. 359-371 ◽  
Author(s):  
C. M. Roden ◽  
P. G. Rodhouse ◽  
M. P. Hensey ◽  
T. McMahon ◽  
T. H. Ryan ◽  
...  
Keyword(s):  
Primary Productivity ◽  
West Coast ◽  
Detailed Knowledge ◽  
Successful Management ◽  
The West ◽  
Salmon Farming ◽  
Extensive Survey ◽  
Western Ireland ◽  
Mussel Cultivation

Killary Harbour is a fjord or sea loch on the west coast of Ireland. With the growth of aquaculture the harbour has become the site of both raft mussel cultivation and more recently, salmon farming. The successful management of these resources requires a detailed knowledge of the harbour's hydrography and ecology. In 1980/1 an extensive survey of the harbour was made. Papers dealing with primary productivity (McMahon & Patching, 1984) zooplankton (Ryan et al. 1986) and the biology of mussels (Rodhouse et al. 1984 a, b, 1985) have already been published. In this paper, we describe the phytoplankton of the harbour and factors which influence distribution and growth.

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