Input of Terrestrial Material into Coastal Patagonian Waters and Its Effects on Phytoplankton Communities from the Chubut River Estuary (Argentina)

Vizzo, Juan I.; Cabrerizo, Marco J.; Villafañe, Virginia E.; Helbling, E. Walter

doi:10.1007/978-3-030-75602-4_7

Cited by 2 publications

(4 citation statements)

References 94 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mixed treatments were applied using a customized mixing simulator equipped with a frequency‐controlled DC motor (Maxon motor, Sachseln, Switzerland) that maintained a selectable constant velocity during the incubations. The earlier mentioned incubations were done using two water column transparency levels, with PAR attenuation coefficients (

k_{d_{PAR}}

) of 0.8 (clear) and 3 (turbid) m −1 , thus simulating different inputs of terrigenous material (browning), as do normally occur in coastal areas either due to rainfall or wind deposition (Vizzo et al ., 2021b). The water column transparency in the water bath was manipulated by adding terrigenous material collected from the local estuary runoff following the methods of Helbling et al .…”

Section: Methodsmentioning

confidence: 99%

“…Also, Bermejo et al (2018) showed that nutrient inputs increased twofold to 10-fold in the same study area (Chubut River estuary) during periods of extreme rainfall. After these inputs of DOC and nutrient-enriched terrestrial material, surface waters of the Patagonian coast experienced abrupt declines in water transparency (PAR k d ranged from 1.5 (no rainfall) to c. 9 (after extreme rainfall)) (Vizzo et al, 2021b), and their phytoplankton communities exhibited reductions in the efficiency of light energy conversion (i.e. decrease in the ETR : NCP ratio) into community production (Villafañe et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Browning, nutrient inputs, and fast vertical mixing from simulated extreme rainfall and wind stress alter estuarine phytoplankton productivity

et al. 2023

Self Cite

View full text Add to dashboard Cite

Summary Browning and nutrient inputs from extreme rainfall, together with increased vertical mixing due to strong winds, are more frequent in coastal ecosystems; however, their interactive effects on phytoplankton are poorly understood. We conducted experiments to quantify how browning, together with different mixing speeds (fluctuating radiation), and a nutrient pulse alter primary productivity and photosynthetic efficiency in estuarine phytoplankton communities. Phytoplankton communities (grazers excluded) were exposed simultaneously to these drivers, and key photosynthetic targets were quantified: oxygen production, electron transport rates (ETRs), and carbon fixation immediately following collection and after a 2‐d acclimation/adaptation period. Increasing mixing speeds in a turbid water column (e.g. browning) significantly decreased ETRs and carbon fixation in the short term. Acclimation/adaptation to this condition for 2 d resulted in an increase in nanoplanktonic diatoms and a community that was photosynthetically more efficient; however, this did not revert the decreasing trend in carbon fixation with increased mixing speed. The observed interactive effects (resulting from extreme rainfall and strong winds) may have profound implications in the trophodynamics of highly productive system such as the Southwest Atlantic Ocean due to changes in the size structure of the community and reduced productivity.

show abstract

k_{d_{PAR}}

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Browning, nutrient inputs, and fast vertical mixing from simulated extreme rainfall and wind stress alter estuarine phytoplankton productivity

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…Similar long-term trends of increasing inputs of sediment and terrestrially derived DOM are causing decreased water transparency in the North Sea, a phenomenon termed “coastal darkening” [ 16 ]. In the Southern Hemisphere, climate change is also altering rainfall patterns and increasing inputs of terrestrial material into coastal environments, for example in coastal Patagonian waters [ 17 ].…”

Section: Changes In Abiotic Conditions Alter the Exposure Of Aquatic ...mentioning

confidence: 99%

“…2.1 ). In addition, productivity in coastal ecosystems is augmented by high nutrient input from terrestrial runoff and higher temperatures [ 17 ]. Both environmental factors favour enzymatic mechanisms present in many aquatic organisms that repair UV-induced damage of DNA [ 1 ] and the recovery from UV-induced damage to the photosynthetic apparatus in many species of microalgae (e.g., [ 58 , 61 ]).…”

Section: Uv Radiation In Combination With Climate Change Can Have Adv...mentioning

confidence: 99%

The response of aquatic ecosystems to the interactive effects of stratospheric ozone depletion, UV radiation, and climate change

Neale

Williamson

Banaszak

et al. 2023

Photochem Photobiol Sci

View full text Add to dashboard Cite

Variations in stratospheric ozone and changes in the aquatic environment by climate change and human activity are modifying the exposure of aquatic ecosystems to UV radiation. These shifts in exposure have consequences for the distributions of species, biogeochemical cycles, and services provided by aquatic ecosystems. This Quadrennial Assessment presents the latest knowledge on the multi-faceted interactions between the effects of UV irradiation and climate change, and other anthropogenic activities, and how these conditions are changing aquatic ecosystems. Climate change results in variations in the depth of mixing, the thickness of ice cover, the duration of ice-free conditions and inputs of dissolved organic matter, all of which can either increase or decrease exposure to UV radiation. Anthropogenic activities release oil, UV filters in sunscreens, and microplastics into the aquatic environment that are then modified by UV radiation, frequently amplifying adverse effects on aquatic organisms and their environments. The impacts of these changes in combination with factors such as warming and ocean acidification are considered for aquatic micro-organisms, macroalgae, plants, and animals (floating, swimming, and attached). Minimising the disruptive consequences of these effects on critical services provided by the world’s rivers, lakes and oceans (freshwater supply, recreation, transport, and food security) will not only require continued adherence to the Montreal Protocol but also a wider inclusion of solar UV radiation and its effects in studies and/or models of aquatic ecosystems under conditions of the future global climate. Graphical abstract

show abstract

Input of Terrestrial Material into Coastal Patagonian Waters and Its Effects on Phytoplankton Communities from the Chubut River Estuary (Argentina)

Cited by 2 publications

References 94 publications

Browning, nutrient inputs, and fast vertical mixing from simulated extreme rainfall and wind stress alter estuarine phytoplankton productivity

Browning, nutrient inputs, and fast vertical mixing from simulated extreme rainfall and wind stress alter estuarine phytoplankton productivity

The response of aquatic ecosystems to the interactive effects of stratospheric ozone depletion, UV radiation, and climate change

Contact Info

Product

Resources

About