English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/167493
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Response of phytoplankton to enhanced atmospheric and riverine nutrient inputs in a coastal upwelling embayment

AuthorsTeixeira, I. G. ; Arbones, Belén ; Froján, M. ; Nieto-Cid, Mar ; Álvarez-Salgado, Xosé Antón ; Castro, Carmen G. ; Fernández, Emilio; Sobrino, Cristina; Teira, Eva; Figueiras, F. G.
Atmospheric deposition
Riverine inputs
Upwelling system
NW Spain
Ria de Vigo
Issue Date2018
CitationEstuarine Coastal and Shelf Science 210: 132-141 (2018)
AbstractOver the past decades, as a consequence of human activity, there was an increase in nutrient inputs to the ocean and they are expected to enhance even more in the future. Coastal areas, accounting for a significant proportion of marine primary productivity, are the most vulnerable zones to anthropogenic impacts. The response of phytoplankton communities to an increase in organic and inorganic nutrients levels from natural allochthonous sources was assessed in microcosm experiments conducted in a coastal system affected by intermittent upwelling events (Ría de Vigo, NW Iberia). Three nutrient addition experiments were performed in spring, summer and autumn, when surface water was supplemented with 5 and 10% of atmospheric and riverine matter. Pico-, nano- and microphytoplankton abundances, chlorophyll a concentration (Chl a) and primary production rates (PP) were measured and compared with those in the control seawater sample (without additions) after 48 h of incubation. Simultaneous experiments with controlled additions of inorganic and organic nutrients were also performed in order to describe the limiting nutrient for phytoplankton growth at each experiment. The composition of the matter inputs and the structure of the phytoplankton communities determined the type of response observed. Phytoplankton responses varied among seasons, being positively correlated with dissolved inorganic nitrogen (DIN) concentrations. As expected, the phytoplankton responses to external nutrient inputs were stronger under low nutrient levels (summer) than when phytoplankton was already growing in nutrient replete conditions (spring). Null and negative responses to the natural inputs were observed in autumn, which suggests that the oceanic phytoplankton advected to this coastal system during downwelling events could be occasionally inhibited by these nutrient inputs. In a future global change scenario, characterized by enhanced nutrient inputs from riverine and atmospheric origin, the response of phytoplankton communities will strongly depend on the concentration and chemical composition of these inputs and on the structure of phytoplankton communities able to respond to them.
Description10 pages, 6 figures, 5 tables
Publisher version (URL)https://doi.org/10.1016/j.ecss.2018.06.005
Appears in Collections:(IIM) Artículos
Files in This Item:
File Description SizeFormat 
Response_phytoplankton_2018.pdf Embargoed until October 15, 2020766,16 kBAdobe PDFThumbnail
View/Open    Request a copy
Show full item record
Review this work

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.