Environmental Monitoring and Assessment

, Volume 185, Issue 6, pp 5055–5070 | Cite as

Assessing the micro-phytoplankton response to nitrate in Comau Fjord (42°S) in Patagonia (Chile), using a microcosms approach

  • José Luis Iriarte
  • Silvio Pantoja
  • Humberto E. González
  • Gabriela Silva
  • Hector Paves
  • Pamela Labbé
  • Lorena Rebolledo
  • Murat Van Ardelan
  • V. Häussermann
Article

Abstract

Anthropogenic (aquaculture) changes in environment nutrient concentrations may affect phytoplankton (biomass and taxa composition) in marine coastal waters off the Chilean Patagonia. The effects of adding nitrate (NO3) to natural phytoplankton assemblages were evaluated considering biomass, cell abundance, and taxonomic composition. Microcosm experiments were performed in the spring, summer, and winter in the Comau Fjord located in Subantarctic Patagonia. At the end of the experiments, NO3 decreased rapidly and was undetectable in treatments, indicating a strong NO3 deficiency associated with an exponential increase in Chl-a concentrations, particulate organic nitrogen, and carbon in these treatments. Moreover, given the depleted nitrate concentrations of the spring and summer experiments, the micro-phytoplankton taxa structure shifted from mixed diatom and dinoflagellate assemblages (Ceratium spp., Dinophysis spp., Coscinodiscus sp., Rhizosolenia pungens) to assemblages dominated by blooms of the classic chain-forming diatoms found in temperate and cold waters such as Chaetoceros spp., Skeletonema spp., and Thalassiosira spp. Thus, nitrogen sources (i.e., nitrate, ammonia) may influence phytoplankton abundance and biomass accumulation dynamics in the northern section of Patagonia. It also emphasizes the importance of diatom taxa in regards to the short-term response of phytoplankton to changing environmental nutrient conditions due to natural (decreasing freshwater stream flow) and anthropogenic (aquaculture) events. This situation may be one of the future scenarios in the Patagonian fjords, thus stressing the needs for active environmental monitoring and impact assessment.

Keywords

Diatoms Nitrate Chlorophyll-a Phytoplankton structure Patagonian fjords 

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Copyright information

© Springer Science+Business Media Dordrecht 2012

Authors and Affiliations

  • José Luis Iriarte
    • 1
    • 2
  • Silvio Pantoja
    • 2
    • 3
  • Humberto E. González
    • 2
    • 4
  • Gabriela Silva
    • 1
  • Hector Paves
    • 4
  • Pamela Labbé
    • 3
  • Lorena Rebolledo
    • 4
  • Murat Van Ardelan
    • 5
  • V. Häussermann
    • 6
    • 7
  1. 1.Instituto de Acuicultura and Centro de Investigación en Ecosistemas de la Patagonia-CIEPUniversidad Austral de ChilePuerto MonttChile
  2. 2.COPAS Sur-Austral, Centro de Investigación Oceanográfica en el Pacífico Sur-orientalUniversidad de ConcepciónConcepciónChile
  3. 3.Departamento de OceanografíaUniversidad de ConcepciónConcepciónChile
  4. 4.Instituto de Ciencias Marinas y LimnológicasUniversidad Austral de ChileValdiviaChile
  5. 5.Department of ChemistryNorwegian University of Science and Technology, NTNUTrondheimNorway
  6. 6.Pontificia Universidad Católica de ValparaísoFacultad de Recursos Naturales, Escuela de Ciencias del MarValparaísoChile
  7. 7.Huinay Scientific Field StationPuerto MonttChile

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