scholarly journals Biomass and leaf dynamics of Cymodocea nodosa in the Ria Formosa lagoon, South Portugal

2007 ◽  
Vol 50 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Alexandra H. Cunha ◽  
Carlos M. Duarte
Keyword(s):  
Cymodocea Nodosa ◽  
Ria Formosa ◽  
South Portugal ◽  
Leaf Dynamics

Salt marshes adjustment to anthropogenic pressures and sea-level rise

2021 ◽  
Author(s):  
A. Rita Carrasco ◽  
Katerina Kombiadou ◽  
Miguel Amado
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Salt Marshes ◽  
Anthropogenic Pressures ◽  
The Past ◽  
Ria Formosa ◽  
Sediment Loads ◽  
Human Interventions ◽  
South Portugal ◽  
And Sea Level

<p>It is predictable that salt marshes in regions, where sediment loads are high, should be stable against a broader range of relative sea level scenarios than those in sediment-poor systems. Despite extensive theoretical and laboratory studies, additional syntheses of marsh ‘persistence’ indicators under human interventions and accelerated sea-level rise rates are still needed. This study investigates the recent lateral changes occurring in lagoon-type marshes of the Ria Formosa lagoon (south Portugal) in the presence of human interventions and sea-level rise, to identify the major drivers for past marsh evolution and to estimate potential future trends. The conducted analysis assessed the past geomorphological adjustment based on imagery analysis and assessed its potential future adjustment to sea-level rise (~100 years) based on modelled land cover changes (by employing the SLAMM model within two sea-level rise scenarios).</p><p>Salt marshes in the Ria Formosa showed slow lateral growth rates over the last 70 years (<1 mm∙yr<sup>-1</sup>), with localized erosion along the main navigable channels associated with dredging activities. Higher change rates were noted near the inlets, with stronger progradation near the natural inlets of the system, fed by sediment influx pulses. Any potential influence of sea-level increase to an intensification of marsh-edge erosion in the past, could not be distinguished from human-induced pressures in the area. No significant sediment was exchanged between the salt marshes and tidal flats, and no self-organization pattern between them was observed in past. The related analysis showed that landcover changes in the salt marsh areas are likely to be more prominent in the future. The obtained results showed evidence of non-linearity in marsh response to high sea-level rise rates, which could indicate to the presence of critical thresholds and potential negative feedbacks within the system, with significant implications to marsh resilience.</p>

scholarly journals Discerning natural and anthropogenic organic matter inputs to salt marsh sediments of Ria Formosa lagoon (South Portugal)

2020 ◽  
Vol 27 (23) ◽  
pp. 28962-28985
Author(s):  
Mukesh Kumar ◽  
Tomasz Boski ◽  
Francisco J. González-Vila ◽  
José Mª de la Rosa ◽  
José A. González-Pérez
Keyword(s):  
Organic Matter ◽  
Salt Marsh ◽  
Ria Formosa ◽  
Marsh Sediments ◽  
Salt Marsh Sediments ◽  
South Portugal

scholarly journals Biogeochemical modelling of Ria Formosa (South Portugal)

Hydrobiologia ◽  
2008 ◽  
Vol 611 (1) ◽  
pp. 115-132 ◽  
Author(s):  
P. Duarte ◽  
B. Azevedo ◽  
M. Guerreiro ◽  
C. Ribeiro ◽  
R. Bandeira ◽  
...  
Keyword(s):  
Ria Formosa ◽  
South Portugal

First record of the Mediterranean parrotfish, Sparisoma cretense in Ria Formosa (south Portugal)

2008 ◽  
Vol 1 ◽  
Author(s):  
David Abecasis ◽  
Luís Bentes ◽  
Joaquim Ribeiro ◽  
Daniel Machado ◽  
Frederico Oliveira ◽  
...  
Keyword(s):  
First Record ◽  
Ria Formosa ◽  
The Mediterranean ◽  
South Portugal

Seahorse (Hippocampinae) population fluctuations in the Ria Formosa Lagoon, south Portugal

2015 ◽  
Vol 87 (3) ◽  
pp. 679-690 ◽  
Author(s):  
M. Correia ◽  
I. R. Caldwell ◽  
H. J. Koldewey ◽  
J. P. Andrade ◽  
J. Palma
Keyword(s):  
Population Fluctuations ◽  
Ria Formosa ◽  
South Portugal

scholarly journals Heatwave Effects on the Photosynthesis and Antioxidant Activity of the Seagrass Cymodocea nodosa under Contrasting Light Regimes

Oceans ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 448-460
Author(s):  
Monya M. Costa ◽  
João Silva ◽  
Isabel Barrote ◽  
Rui Santos
Keyword(s):  
Climate Change ◽  
Photosynthetic Pigments ◽  
Soluble Sugar ◽  
Soluble Sugars ◽  
Photochemical Efficiency ◽  
Climate Change Scenarios ◽  
Effective Quantum Yield ◽  
Cymodocea Nodosa ◽  
Antioxidant Responses ◽  
Ria Formosa

Global climate change, specifically the intensification of marine heatwaves, affect seagrasses. In the Ria Formosa, saturating light intensities may aggravate heatwave effects on seagrasses, particularly during low spring tides. However, the photophysiological and antioxidant responses of seagrasses to such extreme events are poorly known. Here, we evaluated the responses of Cymodocea nodosa exposed at 20 °C and 40 °C and 150 and 450 μmol quanta m−2 s−1. After four-days, we analyzed (a) photosynthetic responses to irradiance, maximum photochemical efficiency (Fv/Fm), the effective quantum yield of photosystem II (ɸPSII); (b) soluble sugars and starch; (c) photosynthetic pigments; (d) antioxidant responses (ascorbate peroxidase, APX; oxygen radical absorbance capacity, ORAC, and antioxidant capacity, TEAC); (d) oxidative damage (malondialdehyde, MDA). After four days at 40 °C, C. nodosa showed relevant changes in photosynthetic pigments, independent of light intensity. Increased TEAC and APX indicated an “investment” in the control of reactive oxygen species levels. Dark respiration and starch concentration increased, but soluble sugar concentrations were not affected, suggesting higher CO2 assimilation. Our results show that C. nodosa adjusts its photophysiological processes to successfully handle thermal stress, even under saturating light, and draws a promising perspective for C. nodosa resilience under climate change scenarios.

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