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Ammonium, nitrate and phytoplankton interactions in a freshwater tidal estuarine zone: potential effects of cultural eutrophication

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dc.contributor.authorDomingues, Rita B.
dc.contributor.authorBarbosa, Ana
dc.contributor.authorSommer, Ulrich
dc.contributor.authorGalvão, Helena M.
dc.date.accessioned2012-11-29T14:52:01Z
dc.date.available2012-11-29T14:52:01Z
dc.date.issued2011
dc.description.abstractNitrate and ammonium are the most important nitrogen sources for phytoplankton growth. Differential utilization of inorganic nitrogenous compounds by phytoplankton has been observed and may have significant impacts on primary productivity at local scales. We used enrichment experiments with natural phytoplankton populations from the freshwater tidal zone of the Guadiana estuary, a coastal ecosystem increasingly subjected to anthropogenic influences, to study the effects of nitrate and ammonium on N-consumption and phytoplankton growth. In addition, we used combined additions of nitrate and ammonium to understand the inhibitory effect of ammonium over nitrate uptake. Ammonium concentrations in the freshwater tidal reaches of the Guadiana estuary throughout the sampling period were too low to exert an inhibitory effect on nitrate uptake or a toxic effect on phytoplankton growth. Nitrate was clearly the main nitrogen source for phytoplankton at the study site. Overall, nitrate seemed to become limiting at concentrations lower than 20 lM and N-limitation was particularly significant during summer. A trend of decreasing nitrate uptake with increasing ammonium concentrations and uptake suggested an overall preference for ammonium. However, preference for ammonium was group-specific, and it was observed mainly in green algae and cyanobacteria. In fact, cyanobacteria relied only on ammonium as their N-source. On the contrary, diatoms preferred nitrate, and did not respond to ammonium additions. The increasing eutrophication in the Guadiana estuary and particularly increased inputs of nitrogen as ammonium due to urban waste effluents may result in a shift in phytoplankton community composition, towards a dominance of cyanobacteria and green algae.por
dc.identifier.citationDomingues RB, AB Barbosa, U Sommer and HM Galvão, 2011. Ammonium, nitrate and phytoplankton interactions in a freshwater tidal estuarine zone: potential effects of cultural eutrophication. Aquatic Sciences 73: 331-343.por
dc.identifier.otherAUT: HGA00327; ABA00694;
dc.identifier.urihttp://hdl.handle.net/10400.1/1900
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevier Lta.por
dc.relation.publisherversionDOI 10.1007/s00027-011-0180-0por
dc.subjectPhytoplanktonpor
dc.subjectNutrient limitationpor
dc.subjectNitrogenpor
dc.subjectNitratepor
dc.subjectAmmoniumpor
dc.subjectGuadiana estuarypor
dc.subjectEstuariespor
dc.titleAmmonium, nitrate and phytoplankton interactions in a freshwater tidal estuarine zone: potential effects of cultural eutrophicationpor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage343por
oaire.citation.startPage331por
oaire.citation.titleAquatic Sciencespor
oaire.citation.volume73por
person.familyNameDomingues
person.familyNameBarbosa
person.familyNameGalvão
person.givenNameRita
person.givenNameAna
person.givenNameHelena
person.identifier640932
person.identifier1291299
person.identifier.ciencia-id7417-4EEC-3408
person.identifier.ciencia-idF514-2180-4CF8
person.identifier.ciencia-idC51A-2C5A-CF8D
person.identifier.orcid0000-0002-7107-8222
person.identifier.orcid0000-0002-7402-246X
person.identifier.orcid0000-0003-0939-8994
person.identifier.scopus-author-id8627143500
person.identifier.scopus-author-id7103244778
person.identifier.scopus-author-id6505974701
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication43632aa6-ab1f-4c52-8737-dc069bc29291
relation.isAuthorOfPublication5b72648c-41b5-46c0-9a7f-7fa2f514b973
relation.isAuthorOfPublicationef31f343-34f9-4aec-a095-e070235d23b3
relation.isAuthorOfPublication.latestForDiscovery43632aa6-ab1f-4c52-8737-dc069bc29291

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