scholarly journals Life strategies of cephalopod paralarvae in a coastal upwelling system (NW Iberian Peninsula): insights from zooplankton community and spatio-temporal analyses

2016 ◽  
Vol 25 (3) ◽  
pp. 241-258 ◽  
Author(s):  
Álvaro Roura ◽  
X. Antón Álvarez-Salgado ◽  
Ángel F. González ◽  
María Gregori ◽  
Gabriel Rosón ◽  
...  
Keyword(s):  
Iberian Peninsula ◽  
Coastal Upwelling ◽  
Zooplankton Community ◽  
Life Strategies ◽  
Upwelling System ◽  
Spatio Temporal

scholarly journals Cycling of dissolved and particulate carbohydrates in a coastal upwelling system (NW Iberian Peninsula)

2004 ◽  
Vol 283 ◽  
pp. 39-54 ◽  
Author(s):  
M Nieto-Cid ◽  
XA Álvarez-Salgado ◽  
S Brea ◽  
FF Pérez
Keyword(s):  
Iberian Peninsula ◽  
Coastal Upwelling ◽  
Upwelling System

Bloom dynamics and life cycle strategies of two toxic dinoflagellates in a coastal upwelling system (NW Iberian Peninsula)

2010 ◽  
Vol 57 (3-4) ◽  
pp. 222-234 ◽  
Author(s):  
Isabel Bravo ◽  
Santiago Fraga ◽  
Rosa Isabel Figueroa ◽  
Yolanda Pazos ◽  
Ana Massanet ◽  
...  
Keyword(s):  
Life Cycle ◽  
Iberian Peninsula ◽  
Coastal Upwelling ◽  
Upwelling System ◽  
Toxic Dinoflagellates

scholarly journals Effects of upwelling duration and phytoplankton growth regime on dissolved oxygen levels in an idealized Iberian Peninsula upwelling system

2019 ◽  
Author(s):  
João H. Bettencourt ◽  
Vincent Rossi ◽  
Lionel Renault ◽  
Peter Haynes ◽  
Yves Morel ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Iberian Peninsula ◽  
Coastal Upwelling ◽  
Net Primary Production ◽  
Coastal Region ◽  
Phytoplankton Growth ◽  
Biogeochemical Model ◽  
Nutrient Inputs ◽  
Upwelling System ◽  
Growth Regime

Abstract. We apply a coupled modelling system composed of a state-of-the-art hydrodynamical model and a low complexity biogeochemical model to an idealized Iberian Peninsula upwelling system to identify the main drivers of dissolved oxygen variability and to study its response to changes in the duration of the upwelling season and in phytoplankton growth regime. We find that the export of oxygenated waters by upwelling front turbulence is a major sink for nearshore dissolved oxygen. In our simulations of summer upwelling, when phytoplankton population is generally dominated by diatoms whose growth is largely enhanced by nutrient input, net primary production and air-sea exchange compensate dissolved oxygen depletion by offshore export over the shelf. A shorter upwelling duration causes relaxation of upwelling winds and a decrease in offshore export, resulting in a slight increase of net dissolved oxygen enrichment in the coastal region as compared to longer upwelling durations. When phytoplankton is dominated by groups less sensitive to nutrient inputs, growth rates decrease and the coastal region becomes net heterotrophic. Together with the physical sink, this lowers the net oxygenation rate of coastal waters, that remains positive only because of air-sea exchanges. These findings help disentangling the physical and biogeochemical controls of dissolved oxygen in upwelling systems and, together with projections of increased duration of upwelling seasons and phytoplankton community changes, suggest that the Iberian coastal upwelling region may become more vulnerable to hypoxia and deoxygenation.

scholarly journals Movements and behaviour of blue whales satellite tagged in an Australian upwelling system

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Luciana M. Mӧller ◽  
Catherine R. M. Attard ◽  
Kerstin Bilgmann ◽  
Virginia Andrews-Goff ◽  
Ian Jonsen ◽  
...  
Keyword(s):  
Coastal Upwelling ◽  
Human Impacts ◽  
Austral Summer ◽  
Temporal Scale ◽  
Sea Surface ◽  
Height Anomaly ◽  
Environmental Drivers ◽  
Upwelling System ◽  
Spatio Temporal ◽  
Blue Whales

AbstractKnowledge about the movement ecology of endangered species is needed to identify biologically important areas and the spatio-temporal scale of potential human impacts on species. Blue whales (Balaenoptera musculus) are endangered due to twentieth century whaling and currently threatened by human activities. In Australia, they feed in the Great Southern Australian Coastal Upwelling System (GSACUS) during the austral summer. We investigate their movements, occupancy, behaviour, and environmental drivers to inform conservation management. Thirteen whales were satellite tagged, biopsy sampled and photo-identified in 2015. All were genetically confirmed to be of the pygmy subspecies (B. m. brevicauda). In the GSACUS, whales spent most of their time over the continental shelf and likely foraging in association with several seascape variables (sea surface temperature variability, depth, wind speed, sea surface height anomaly, and chlorophyll a). When whales left the region, they migrated west and then north along the Australian coast until they reached West Timor and Indonesia, where their movements indicated breeding or foraging behaviour. These results highlight the importance of the GSACUS as a foraging ground for pygmy blue whales inhabiting the eastern Indian Ocean and indicate the whales’ migratory route to proposed breeding grounds off Indonesia. Information about the spatio-temporal scale of potential human impacts can now be used to protect this little-known subspecies of blue whale.

scholarly journals Effects of upwelling duration and phytoplankton growth regime on dissolved-oxygen levels in an idealized Iberian Peninsula upwelling system

2020 ◽  
Vol 27 (2) ◽  
pp. 277-294
Author(s):  
João H. Bettencourt ◽  
Vincent Rossi ◽  
Lionel Renault ◽  
Peter Haynes ◽  
Yves Morel ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Iberian Peninsula ◽  
Coastal Upwelling ◽  
Net Primary Production ◽  
Coastal Region ◽  
Phytoplankton Growth ◽  
Biogeochemical Model ◽  
Nutrient Inputs ◽  
Upwelling System ◽  
Growth Regime

Abstract. We apply a coupled modelling system composed of a state-of-the-art hydrodynamical model and a low-complexity biogeochemical model to an idealized Iberian Peninsula upwelling system to identify the main drivers of dissolved-oxygen variability and to study its response to changes in the duration of the upwelling season and in the phytoplankton growth regime. We find that the export of oxygenated waters by upwelling front turbulence is a major sink for nearshore dissolved oxygen. In our simulations of summer upwelling, when the phytoplankton population is generally dominated by diatoms whose growth is boosted by nutrient input, net primary production and air–sea exchange compensate dissolved-oxygen depletion by offshore export over the shelf. A shorter upwelling duration causes a relaxation of upwelling winds and a decrease in offshore export, resulting in a slight increase of net dissolved-oxygen enrichment in the coastal region as compared to longer upwelling durations. When phytoplankton is dominated by groups less sensitive to nutrient inputs, growth rates decrease, and the coastal region becomes net heterotrophic. Together with the physical sink, this lowers the net oxygenation rate of coastal waters, which remains positive only because of air–sea exchange. These findings help in disentangling the physical and biogeochemical controls of dissolved oxygen in upwelling systems and, together with projections of increased duration of upwelling seasons and phytoplankton community changes, suggest that the Iberian coastal upwelling region may become more vulnerable to hypoxia and deoxygenation.

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