Journal ArticleDOI
Seasonality of Coastal Phytoplankton in the Baltic Sea: Influence of Salinity and Eutrophication
Zita Rasuolė Gasiūnaitė,Ana Carolina Cardoso,Anna-Stiina Heiskanen,Peter Henriksen,Pirkko Kauppila,Irina Olenina,Renata Pilkaitytė,Ingrida Purina,A. Razinkovas,Sigrid Sagert,Hendrik Schubert,Norbert Wasmund +11 more
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In this article, the authors define seasonal succession patterns of phytoplankton in seven different areas of the Baltic sea, characterised by different salinity, climate, and trophic conditions and delineate a set of PHYTOPLankton community indicators that are independent of season and salinity.Abstract:
In this study long-term (1984–2001) phytoplankton and physico-chemical monitoring data representing different salinity regimes of the Baltic Sea were compiled from HELCOM, national and regional databases. The aim was to define seasonal succession patterns of phytoplankton in seven different areas of the Baltic sea, characterised by different salinity, climate, and trophic conditions and to delineate a set of phytoplankton community indicators that are independent of season and salinity, but indicative of trophic status of different coastal areas. The cluster analysis of the combined data set resulted in eight phytoplankton community types, common for all locations, and characterised by different taxonomic composition representing different stages of seasonal succession. A hierarchy of explanatory variables that best predicted the communities, dominated by either diatoms, cyanophytes, cryptophytes or dinoflagellates, was revealed through a redundancy analysis (RDA). Nutrients were not found to be significant factors shaping the common phytoplankton community types for all locations. RDA analysis at the location level, covering all seasonal succession stages, confirmed phytoplankton community composition to be sensitive to nutrient concentrations. Even with the limitations of utilizing databases from different sources we identified community types that were indicative of climatic conditions (particularly temperature), salinity and eutrophication. The dominance of cyanobacteria as such, would not be an appropriate indicator of trophic conditions in the Baltic Sea, in the areas where cyanobacteria blooms occur naturally. The structure of both diatom- and cyanophyte-dominated communities is governed by salinity, and thus the abundances of these groups cannot be directly used as an indicator across the whole Baltic Sea.read more
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Long-term changes in summer phytoplankton communities of the open northern Baltic Sea
TL;DR: In this paper, the authors investigated relationships between the late summer biomass of different phytoplankton taxa and environmental factors, and their long-term (1979-2003) trends in two areas of the Baltic Sea, the northern Baltic proper (NBP) and the Gulf of Finland (GF), with statistical analyses.
Eutrophication in transitional waters: an overview
J.M. Zaldívar,Pierluigi Viaroli,Alice Newton,Rutger de Wit,Carles Ibáñez,Sofia Reizopoulou,Francesca Somma,Arturas Razinkovas,Alberto Basset,Marianne Holmer,Nicholas Murray +10 more
TL;DR: In this article, the main elements characterizing Transitional Waters (TWs) and the current understanding of the process of eutrophication and the problems this raises in establishing reference conditions, in view of the need of implementing the Water Framework Directive (WFD).
Journal ArticleDOI
Increased freshwater discharge shifts the trophic balance in the coastal zone of the northern Baltic Sea
TL;DR: In this article, increased precipitation is one projected outcome of climate change that may enhance the discharge of freshwater to the coastal zone, resulting lower salinity and associated discharge of both n...
Journal ArticleDOI
Summer algal blooms in shallow estuaries: Definition, mechanisms, and link to eutrophication
TL;DR: Bloom frequency and intensity decreased from 1989 to 2004, corresponding to decreases in nutrient inputs and concentrations, but only bloom frequency could be directly linked to the actual total nitrogen concentrations, whereas bloom intensities depended on site-specific features, particularly a threshold response for stations exposed to hypoxia.
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Harmful algal blooms (red tide): a review of causes, impacts and approaches to monitoring and prediction
E. Zohdi,Madjid Abbaspour +1 more
TL;DR: In this article, the authors proposed different observation and prediction methods ever used worldwide, including field observation and using sampling data, satellite-based studies, laboratory studies, modeling, and complex numerical models, conceptual models, simple analytic formula, semi-empirical models and aggregated box models or zero-dimensional models.
References
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Journal ArticleDOI
Zur Vervollkommnung der quantitativen Phytoplankton-Methodik
TL;DR: In this paper, the main aim is to describe the counting-chamber method and the numerous difficulties encountered in quantitative plankton research are discussed and ways of avoiding them are described together with improvements of technique that save time.
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Our evolving conceptual model of the coastal eutrophication problem
TL;DR: For example, a recent review of the early phase of the coastal eutrophication problem can be found in this article, where the authors suggest that the early (phase I) con- ceptual model was strongly influenced by limnologists, who began intense study of lake eutrophicication by the 1960s.
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Coastal marine eutrophication: A definition, social causes, and future concerns
TL;DR: There is a need in the marine research and management communities for a clear operational definition of the term, eutrophication, and the following are proposed: this definition is consistent with historical usage and emphasizes that eUTrophication is a process, not a trophic state.
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Distance‐based redundancy analysis: testing multispecies responses in multifactorial ecological experiments
TL;DR: It is the view that distance-based RDA will be extremely useful to ecologists measuring multispecies responses to structured multifactorial experimental designs.