Particle fluxes and their drivers in the Avilés submarine canyon and adjacent slope, central Cantabrian margin, Bay of Biscay

Rumín-Caparrós, Aitor; Sánchez-Vidal, Anna; González-Pola, César; Lastras, Galderic; Calafat, Antoni; Canals, Miquel

doi:10.1016/j.pocean.2016.03.004

Cited by 14 publications

(7 citation statements)

References 113 publications

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“…C). This concurs with lower mass fluxes to the seafloor than in spring (Rumín‐Caparrós et al ) and limited primary production, which leads to a food web mainly dependent on recycled production. In addition, it is precisely in these conditions that the diel vertical migrations of zooplankton are more active (Takahashi et al ), what would lead to vertical homogenization.…”

Section: Discussionsupporting

confidence: 77%

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Seasonal and vertical dynamics in the trophic structure of a temperate zooplankton assemblage

Romero-Romero

González-Gil

Cáceres

et al. 2019

Limnology & Oceanography

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We determined the stable nitrogen isotope composition (δ15N values) and body size of taxonomic groups in a zooplankton community in the Cantabrian Sea (southern Bay of Biscay) to explore seasonal and depth (0–2000 m) variations in the size‐based trophic structure and their coupling to the production cycle. The positive linear relationship between δ15N values and log‐transformed body size reflects the dominance of new vs. regenerated production. The slope of the relationship (b) is high during productive periods and low when herbivory declines and the food web is more dependent on recycled production. This variation can be attributed to high δ15N values of the smallest plankton after repetitive cycles of microbial degradation. Downward transport of organic matter after the spring phytoplankton bloom was captured by a steady variation from low values of b at the surface to high values at the bathypelagic zone, where the imprint of the spring production pulse could be detected. Variation in b reveals that the mesopelagic and bathypelagic zooplankton communities are as dynamic as their epipelagic counterparts. This shows the efficiency of δ15N vs. body size relationships to capture fast, transient ecosystem processes without need for lengthy incubations or complex rate measurements.

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Section: Discussionsupporting

confidence: 77%

“…B). Phytoplankton biomass in SW during this cruise had already declined after the 2013 spring bloom (Rumín‐Caparrós et al ), so herbivory was likely limited. A shallower b was probably the result of opportunistic feeding by the larger organisms on microzooplankton or small‐sized particles when food is scarce (Fry and Quiñones ).…”

Section: Discussionmentioning

confidence: 97%

Seasonal and vertical dynamics in the trophic structure of a temperate zooplankton assemblage

Romero-Romero

González-Gil

Cáceres

et al. 2019

Limnology & Oceanography

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“…Thus, increased diatom growth in the surface during the bloom might lead to a rapid export of phytoplankton to waters several hundreds of meters below. In our study area, this hypothesis is supported by the large pulses of biogenic silica collected by deep sediment traps during the spring blooms of 2012 and 2013 (Rumín‐Caparrós et al ; traps were moored at 1178 m and 1154 m depth over the Avilés Canyon and westwards over the open slope, respectively).…”

Section: Discussionsupporting

confidence: 61%

Winter‐mixing preconditioning of the spring phytoplankton bloom in the Bay of Biscay

González-Gil

Taboada

Cáceres

et al. 2017

Limnology & Oceanography

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The spring phytoplankton bloom plays a key role in the dynamics of temperate and polar seas. Nevertheless, the mechanisms and processes behind these blooms remain a subject of considerable debate. We analyzed the influence of deep mixing during winter on the spring phytoplankton bloom in the Cantabrian Sea (southern Bay of Biscay). To this end, we combined long‐term physical and biogeochemical in situ data (1993–2012) and satellite observations (1997–2012). Deeper winter mixing led to higher nitrate and chlorophyll concentrations through the water column during the spring bloom. However, this effect was modified by short‐term variability in near‐surface stratification in spring. Winter‐mixing preconditioning also influenced different spring bloom metrics: deeper and later mixing in winter was followed by later blooms with a larger peak. In these enhanced blooms, nitrate was taken up at faster rates, indicating higher rates of phytoplankton production. Winters with weaker mixing (that led to weaker spring blooms) were associated with warmer surface temperatures. This relationship suggests that the multi‐decadal trend toward warmer surface temperatures in the Bay of Biscay may promote a decrease in the magnitude of the spring bloom, which could impact upper trophic levels and also deep carbon export in the future.

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“…These turbidite systems were primarily fed by large rivers that ori ginated from northern Europe (Auffret et al, 2003;Droz et al, 2003). In the southern Bay of Biscay, ho wever, turbidi te systems, sourced from the Cantabrian and Pyrenees mountai ns, started to generate in the Pliocene (Bourillet et al, 2006;Gaudin et al, 2006;Rumín-Caparrós et al, 2016). No channel-levee features or J o u r n a l P r e -p r o o f Journal Pre-proof turbidite fans are observed in the Miocene unit, indicating the absence of dominant turbidity currents.…”

Section: Onset Stage (Miocene-late Pliocene)mentioning

confidence: 99%

Sedimentary evolution of the Le Danois contourite drift systems (southern Bay of Biscay, NE Atlantic): A reconstruction of the Atlantic Mediterranean Water circulation since the Pliocene

et al. 2020

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The evolution of the Le D anois contourite depositional systems (CDS) during the Pliocene and Quaternary was investi gated bas ed on high-resolution s eismic reflection data. From old to young, six seismic units (U1 to U6) bounded by major discontinuiti es (H1 to H6) were identified. Regarding variations of the bottomcurrent circul ation, four evolution stages of the Le Danois CD S were identified, includi ng onset (~5.3 to 3.5-3.0 Ma), initial (3.5-3.0 to 2.5-2.1 M a), intermediate (2.5-2.1 to 0.9-0.7 M a) and drift-growth (0.9-0.7 Ma to present day) s tages. The CD S associated wi th the Atlantic Mediterranean Water (AMW) along the middle continental slope initiated at ~3. 5-3 Ma and was widely built after the Mid-Pl eistocene Transition (MPT; 0.9-07 M a). At a s hallower water depth, a second CD S associated with the Eastern North Atl antic Central Water (ENACW) s tarted to develop from the late Quaternary (~0.47 M a) onwards. In the AM Wrelated drift system, the Le Danois Drift was generated both under glaci al and interglacial climatic oscilations. Repeated internal s tructures in uni t 5 that consist of acoustically transparent lower parts, moderate amplitude upper parts and high amplitude erosional surfaces at the top, are compared with interglaci al/glaci al cycles since the middle Pleistocene to the pres ent day. These cyclic features suggest coarsening-upward sequences of the Le Danois Drift and processes rel ated to enhanced AMW duri ng glacial stages. The es timated s edimentation rate of the Le Danois CDS reached a maximum duri ng the MPT (at leas t ~27 cm/ky) and then decreased until present-day (~5 cm/ky). Vari ations of sedimentary stacking patterns and processes of the Le Danois CDS imply full domination of the intermediate water mass along the central Atlantic and southwest European conti nental slopes from the late Pliocene (~3.5-3.0 Ma) onwards.

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Particle fluxes and their drivers in the Avilés submarine canyon and adjacent slope, central Cantabrian margin, Bay of Biscay

Cited by 14 publications

References 113 publications

Seasonal and vertical dynamics in the trophic structure of a temperate zooplankton assemblage

Seasonal and vertical dynamics in the trophic structure of a temperate zooplankton assemblage

Winter‐mixing preconditioning of the spring phytoplankton bloom in the Bay of Biscay

Sedimentary evolution of the Le Danois contourite drift systems (southern Bay of Biscay, NE Atlantic): A reconstruction of the Atlantic Mediterranean Water circulation since the Pliocene

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