Shading by invasive seaweeds reduces photosynthesis of maerl from the Ría de Vigo (NW Spain)

2018 ◽  
Vol 61 (5) ◽  
pp. 453-457
Author(s):  
Sara P. Cobacho ◽  
Luis Navarro ◽  
Nuria Pedrol ◽  
José M. Sánchez
Keyword(s):  
Photosystem Ii ◽  
Undaria Pinnatifida ◽  
Atlantic Coast ◽  
Nw Spain ◽  
Photosystem Ii Efficiency ◽  
Fitness Consequences ◽  
Ría De Vigo ◽  
Modulated Fluorescence ◽  
Maerl Beds ◽  
Set Up

AbstractThe overgrowth and shading of several alien species along the European Atlantic coast are expected to reduce photosynthesis of maerl, decreasing its growth and fitness. In this work, three shade levels (0, 20 and 50%) were set up under laboratory conditions to simulate different competitive scenarios potentially affecting maerl beds. Live individuals ofSargassum muticumandUndaria pinnatifidawere placed over maerl cultures, and the effects of shading were assessed by chlorophyllafluorescence using a pulse-modulated fluorescence monitoring system. Photosystem II efficiency was measured as the ratio of variable to maximal fluorescence (Fv/Fm) as a proxy for the stress experienced by maerl. According to our data, irradiance reduction results in a small, yet significant, impact on the PSII efficiency of maerl, which could have fitness consequences.

The Tahaddart estuary, NW of Morocco: evidence of marine submersion events during the last 3500 years 

2021 ◽  
Author(s):  
Otmane Khalfaoui ◽  
laurent Dezileau ◽  
Jean-Philippe Degeai ◽  
Maria Snoussi
Keyword(s):  
Late Holocene ◽  
Atlantic Coast ◽  
High Energy ◽  
Mitigation Strategies ◽  
Spatial And Temporal Variability ◽  
Progressive Change ◽  
Marine Facies ◽  
Set Up ◽  
Long Term Studies

<p>The Atlantic coast of Morocco has been confronted with several marine submersion events. Historically, some of them have resulted in significant economic and human damage, including the 1755 AD event (known as the tsunami of Lisbon). This indicates the need to implement adaptation and mitigation strategies, based on long-term studies of these extreme events to deduce their spatial and temporal variability. Using two cores (TAH17-1 and TAH17-3) collected from the Tahaddart estuary (NW of Morocco), this work aims to identify deposits, set up by these high energy events during the mid to late Holocene period. The sedimentological, geochemical and geochronological analyses carried out on these geological archives show two fining-upward sequences, indicating a progressive change from a purely sandy marine facies, between 6500 and 3500 BP, to another finer and more terrigenous one. The fine sedimentation, which has dominated in the estuary during the last 3500 years, has facilitated the recording of several marine submersion events in the form of isolated sandy layers. Chronological data have made it possible to date four deposits. Two (1-E1 and 3-E1) were put in place about 250 years ago, which corresponds, according to historical records, to the 1755 AD Lisbon tsunami. Two other deposits (1-E13 and 1-E14) are dated around 3200 BP and represent unknown submersion events on the Moroccan Atlantic coast.</p>

SHORT-TIME SCALE DEVELOPMENT OF A GYMNODINIUM CATENATUM POPULATION IN THE RIA DE VIGO (NW SPAIN)1

1996 ◽  
Vol 32 (2) ◽  
pp. 212-221 ◽  
Author(s):  
Eglee Gomez Fermin ◽  
Francisco G. Figueiras ◽  
Belen Arbones ◽  
Maria Luisa Villarino
Keyword(s):  
Scale Development ◽  
Time Scale ◽  
Short Time Scale ◽  
Nw Spain ◽  
Ría De Vigo ◽  
Short Time ◽  
Gymnodinium Catenatum

scholarly journals First automatic pH measurements in the bottom layer of the Ria de Vigo (NW Spain)

2020 ◽  
Author(s):  
Juan L. Herrera ◽  
Jose González ◽  
Fiz F. Pérez ◽  
Gabriel Rosón ◽  
Ramiro A. Varela
Keyword(s):  
Co2 Concentration ◽  
Bottom Layer ◽  
Pressure Data ◽  
Nw Spain ◽  
Ph Measurements ◽  
Seawater Ph ◽  
Observation Network ◽  
Nw Iberia ◽  
Acid Base Equilibrium ◽  
Ría De Vigo

Abstract. Oceanic Acidification is the process that describes a shift in the acid-base equilibrium caused by the rise of the CO2 concentration in the ocean. The project A.RIOS lists among its goals to establish an observation network of oceanic acidification in the Rías and the Galician shelf (NW Iberia). Included in that observation network, an autonomous instrument for spectrophotometric measurements of seawater pH was deployed at the Ría de Vigo during four periods between November 2017 and May 2019. We present here the pH data for those deployments along with temperature, salinity, and pressure data. All the data is available through an unrestricted repository at https://doi.pangaea.de/10.1594/PANGAEA.909933 (Varela et al., 2019). In the author's opinion, this dataset significantly improves the temporal resolution of the pH database in the Ría of Vigo.

Palynological characterization of gassy sediments in the inner part of Ría de Vigo (NW Spain). New chronological and environmental data

2007 ◽  
Vol 27 (2-4) ◽  
pp. 289-302 ◽  
Author(s):  
C. Muñoz Sobrino ◽  
S. García-Gil ◽  
J. B. Diez ◽  
J. Iglesias
Keyword(s):  
Environmental Data ◽  
Nw Spain ◽  
Ría De Vigo

Light response of D1 turnover and photosystem II efficiency in the seagrassZostera capricorni

Planta ◽  
1996 ◽  
Vol 198 (3) ◽  
pp. 319-323 ◽  
Author(s):  
Yvette S. Flanigan ◽  
Christa Critchley
Keyword(s):  
Photosystem Ii ◽  
Light Response ◽  
Photosystem Ii Efficiency ◽  
D1 Turnover

Reduction in photosystem II efficiency during a virus-controlled Emiliania huxleyi bloom

2014 ◽  
Vol 495 ◽  
pp. 65-76 ◽  
Author(s):  
SA Kimmance ◽  
MJ Allen ◽  
A Pagarete ◽  
J Martínez Martínez ◽  
WH Wilson
Keyword(s):  
Photosystem Ii ◽  
Emiliania Huxleyi ◽  
Photosystem Ii Efficiency
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