scholarly journals Diversity of Aphanizomenonflos-aquae (Cyanobacterium) Populations along a Baltic Sea Salinity Gradient

2002 ◽  
Vol 68 (11) ◽  
pp. 5296-5303 ◽  
Author(s):  
Maria J. Laamanen ◽  
Laura Forsström ◽  
Kaarina Sivonen
Keyword(s):  
Natural Selection ◽  
Baltic Sea ◽  
Brackish Water ◽  
Internal Transcribed Spacer ◽  
Salinity Gradient ◽  
Its Sequences ◽  
23S Rrna ◽  
The Baltic Sea ◽  
Morphological Differences ◽  
The Baltic

ABSTRACT Colony-forming cyanobacteria of the genus Aphanizomenon form massive blooms in the brackish water of the Baltic Sea during the warmest summer months. There have been recent suggestions claiming that the Baltic Sea Aphanizomenon species may be different from Aphanizomenon flos-aquae found in lakes. In this study, we examined variability in the morphology and 16S-23S rRNA internal transcribed spacer (ITS) sequences of A. flos-aquae populations along a salinity gradient from a string of lakes to a fjord-like extension of the Baltic Sea to the open Baltic Sea. Morphological differences among the populations were negligible. We found that the Baltic Sea was dominated (25 out of 27 sequences) by one ITS1-S (shorter band of ITS 1 [ITS1]) genotype, which also was found in the lakes. The lake populations of A. flos-aquae tended to be genetically more diverse than the Baltic Sea populations. Since the lake ITS1-S genotypes of A. flos-aquae are continuously introduced to the Baltic Sea via inflowing waters, it seems that only one ITS1 genotype is able to persist in the Baltic Sea populations. The results suggest that one of the ITS1-S genotypes found in the lakes is better adapted to the conditions of the Baltic Sea and that natural selection removes most of the lake genotypes from the Baltic Sea A. flos-aquae populations.

scholarly journals Changes in long chain alkenone distributions and Isochrysidales groups along the Baltic Sea salinity gradient

2019 ◽  
Vol 127 ◽  
pp. 92-103 ◽  
Author(s):  
Jérôme Kaiser ◽  
Karen J. Wang ◽  
Derek Rott ◽  
Gaoyuan Li ◽  
Yinsui Zheng ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Salinity Gradient ◽  
The Baltic Sea ◽  
The Baltic ◽  
Long Chain

scholarly journals Geographic variation in fitness‐related traits of the bladderwrack Fucus vesiculosus along the Baltic Sea‐North Sea salinity gradient

2019 ◽  
Vol 9 (16) ◽  
pp. 9225-9238 ◽  
Author(s):  
Francisco R. Barboza ◽  
Jonne Kotta ◽  
Florian Weinberger ◽  
Veijo Jormalainen ◽  
Patrik Kraufvelin ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Geographic Variation ◽  
North Sea ◽  
Salinity Gradient ◽  
Fucus Vesiculosus ◽  
The Baltic Sea ◽  
The Baltic

Acclimation limits of Fucus evanescens along the salinity gradient of the southwestern Baltic Sea

2019 ◽  
Vol 62 (1) ◽  
pp. 31-42
Author(s):  
Katharina Romoth ◽  
Petra Nowak ◽  
Daniela Kempke ◽  
Anna Dietrich ◽  
Christian Porsche ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Salinity Gradient ◽  
Phylogenetic Analyses ◽  
Measurement Data ◽  
Limiting Factor ◽  
Photosynthetic Parameters ◽  
Similar Species ◽  
The Baltic Sea ◽  
Fucus Evanescens ◽  
The Baltic

Abstract Over recent decades, the neophyte Fucus evanescens has extended eastwards along the salinity gradient within the Baltic Sea, indicating gradual adaptation to low salinity conditions. To find out whether F. evanescens can migrate further into the Baltic Sea and potentially become a competitor to the native F. vesiculosus, the acclimation potentials of different F. evanescens and F. vesiculosus populations were investigated with respect to habitat salinity. For both species, pigmentation, water content, and photosynthetic rate were measured under laboratory and field conditions. The instantaneous measurement data and incubation experiment did not show clear differences in the measured photosynthetic parameters between different salinity levels (6–20), or between species. Maximum likelihood phylogenetic analyses of the nuclear marker PDI (a putative protein disulfide isomerase) separated F. vesiculosus and F. evanescens into well-defined groups supporting the hypothesis that the two very similar species do not represent different morphotypes of the same species/gene pool. These findings indicate that – at least for the vegetative stage of F. evanescens – salinity may not be a limiting factor for a further spread into the Baltic Sea.

scholarly journals Diversity of Toxic and Nontoxic Nodularia Isolates (Cyanobacteria) and Filaments from the Baltic Sea

2001 ◽  
Vol 67 (10) ◽  
pp. 4638-4647 ◽  
Author(s):  
Maria J. Laamanen ◽  
Muriel F. Gugger ◽  
Jaana M. Lehtimäki ◽  
Kaisa Haukka ◽  
Kaarina Sivonen
Keyword(s):  
Baltic Sea ◽  
Dna Sequences ◽  
Intergenic Spacer ◽  
23S Rrna ◽  
The Baltic Sea ◽  
Field Samples ◽  
Digestion Pattern ◽  
Internally Transcribed Spacer ◽  
The Baltic ◽  
Flanking Regions

ABSTRACT Cyanobacteria of the genus Nodularia form toxic blooms in brackish waters worldwide. In addition,Nodularia spp. are found in benthic, periphytic, and soil habitats. The majority of the planktic isolates produce a pentapeptide hepatotoxin nodularin. We examined the morphologic, toxicologic, and molecular characters of 18 nodularin-producing and nontoxic Nodularia strains to find appropriate markers for distinguishing the toxic strains from the nontoxic ones in field samples. After classical taxonomy, the examined strains were identified as Nodularia sp., Nodularia spumigena,N. baltica, N. harveyana, and N. sphaerocarpa. Morphologic characters were ambiguous in terms of distinguishing between the toxic and the nontoxic strains. DNA sequences from the short 16S-23S rRNA internally transcribed spacer (ITS1-S) and from the phycocyanin operon intergenic spacer and its flanking regions (PC-IGS) were different for the toxic and the nontoxic strains. Phylogenetic analysis of the ITS1-S and PC-IGS sequences from strains identified as N. spumigena, and N. baltica, and N. litorea indicated that the division of the planktic Nodularia into the three species is not supported by the ITS1-S and PC-IGS sequences. However, the ITS1-S and PC-IGS sequences supported the separation of strains designated N. harveyana and N. sphaerocarpa from one another and the planktic strains.HaeIII digestion of PCR amplified PC-IGS regions of all examined 186 Nodularia filaments collected from the Baltic Sea produced a digestion pattern similar to that found in toxic isolates. Our results suggest that only one plankticNodularia species is present in the Baltic Sea plankton and that it is nodularin producing.

scholarly journals Diversity and abundance of “Pelagibacterales” (SAR11) in the Baltic Sea salinity gradient

2014 ◽  
Vol 37 (8) ◽  
pp. 601-604 ◽  
Author(s):  
Daniel P.R. Herlemann ◽  
Jana Woelk ◽  
Matthias Labrenz ◽  
Klaus Jürgens
Keyword(s):  
Baltic Sea ◽  
Salinity Gradient ◽  
The Baltic Sea ◽  
The Baltic

scholarly journals Fractionation of iron species and iron isotopes in the Baltic Sea euphotic zone

2010 ◽  
Vol 7 (8) ◽  
pp. 2489-2508 ◽  
Author(s):  
J. Gelting ◽  
E. Breitbarth ◽  
B. Stolpe ◽  
M. Hassellöv ◽  
J. Ingri
Keyword(s):  
Baltic Sea ◽  
Isotope Composition ◽  
Salinity Gradient ◽  
Euphotic Zone ◽  
Early Spring ◽  
Strong Positive Correlation ◽  
The Baltic Sea ◽  
Gotland Deep ◽  
The Baltic ◽  
Bothnian Sea

Abstract. To indentify sources and transport mechanisms of iron in a coastal marine environment, we conducted measurements of the physiochemical speciation of Fe in the euphotic zone at three different locations in the Baltic Sea. In addition to sampling across a salinity gradient, we conducted this study over the spring and summer season. Moving from the riverine input characterized low salinity Bothnian Sea, via the Landsort Deep near Stockholm, towards the Gotland Deep in the Baltic Proper, total Fe concentrations averaged 114, 44, and 15 nM, respectively. At all three locations, a decrease in total Fe of 80–90% from early spring to summer was observed. Particulate Fe (PFe) was the dominating phase at all stations and accounted for 75–85% of the total Fe pool on average. The Fe isotope composition (δ 56Fe) of the PFe showed constant positive values in the Bothnian Sea surface waters (+0.08 to +0.20‰). Enrichment of heavy Fe in the Bothnian Sea PFe is possibly associated to input of aggregated land derived Fe-oxyhydroxides and oxidation of dissolved Fe(II). At the Landsort Deep the isotopic fractionation of PFe changed between −0.08‰ to +0.28‰ over the sampling period. The negative values in early spring indicate transport of PFe from the oxic-anoxic boundary at ∼80 m depth. The average colloidal iron fraction (CFe) showed decreasing concentrations along the salinity gradient; Bothnian Sea 15 nM; Landsort Deep 1 nM, and Gotland Deep 0.5 nM. Field Flow Fractionation data indicate that the main colloidal carrier phase for Fe in the Baltic Sea is a carbon-rich fulvic acid associated compound, likely of riverine origin. A strong positive correlation between PFe and chl-a indicates that cycling of suspended Fe is at least partially controlled by primary production. However, this relationship may not be dominated by active uptake of Fe into phytoplankton, but instead may reflect scavenging and removal of PFe during phytoplankton sedimentation.

scholarly journals Major differences in dissolved organic matter characteristics and bacterial processing over an extensive brackish water gradient, the Baltic Sea

2018 ◽  
Vol 202 ◽  
pp. 27-36 ◽  
Author(s):  
Owen F. Rowe ◽  
Julie Dinasquet ◽  
Joanna Paczkowska ◽  
Daniela Figueroa ◽  
Lasse Riemann ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Baltic Sea ◽  
Brackish Water ◽  
The Baltic Sea ◽  
Water Gradient ◽  
The Baltic
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