Genetic diversity of Saccharina latissima (Phaeophyceae) along a salinity gradient in the North Sea-Baltic Sea transition zone

2016 ◽  
Vol 52 (4) ◽  
pp. 523-531 ◽  
Author(s):  
Mette Møller Nielsen ◽  
Cristina Paulino ◽  
João Neiva ◽  
Dorte Krause-Jensen ◽  
Annette Bruhn ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Baltic Sea ◽  
Transition Zone ◽  
North Sea ◽  
Salinity Gradient ◽  
Saccharina Latissima ◽  
The North ◽  
The North Sea

Ventilation of bottom water in the North Sea–Baltic Sea transition zone

2009 ◽  
Vol 75 (1-2) ◽  
pp. 138-149 ◽  
Author(s):  
Jørgen Bendtsen ◽  
Karin E. Gustafsson ◽  
Johan Söderkvist ◽  
Jørgen L.S. Hansen
Keyword(s):  
Baltic Sea ◽  
Transition Zone ◽  
North Sea ◽  
Bottom Water ◽  
The North ◽  
The North Sea

Selected elements, PCBs, and PAHs in sediments of the North Sea—Baltic Sea transition zone: Sources and transport as derived from the distribution pattern

2009 ◽  
Vol 109 (1) ◽  
pp. 81-94 ◽  
Author(s):  
Christian Christiansen ◽  
Thomas Leipe ◽  
Gesine Witt ◽  
Peter L. Christoffersen ◽  
Lars C. Lund-Hansen
Keyword(s):  
Baltic Sea ◽  
Distribution Pattern ◽  
Transition Zone ◽  
North Sea ◽  
The North ◽  
The North Sea

scholarly journals A marginal habitat, but not a sink: Ecological genetics reveal a diversification hotspot for marine invertebrates in the brackish Baltic Sea

2021 ◽  
Author(s):  
Jonas C Geburzi ◽  
Nele Heuer ◽  
Lena Homberger ◽  
Jana Kabus ◽  
Zoe Moesges ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Life History ◽  
Baltic Sea ◽  
North Sea ◽  
Native Species ◽  
The Baltic Sea ◽  
Evolutionary Trajectory ◽  
The North ◽  
The North Sea ◽  
The Baltic

Aim: Environmental gradients have emerged as important barriers structuring populations and species distributions. We set out to test whether a strong salinity gradient from marine to brackish, represented in a marginal northern European sea, should be considered a diversification hotspot or a population sink, and to identify life history traits that correlate with either evolutionary trajectory. Location: The Baltic Sea, the North Sea and their transition zone. Methods: We accumulated mitochondrial cytochrome oxidase subunit 1 sequence data and data on the distribution, salinity tolerance and life history for 28 species belonging to the Cnidaria, Crustacea, Echinodermata, Mollusca, Polychaeta and Gastrotricha, including seven non-native species. We calculated measures of genetic diversity and differentiation across the environmental gradient, coalescent times and migration rates between North and Baltic Sea populations, and analysed correlations between genetic and life history data. Results: The majority of investigated species is either genetically differentiated and/or is adapted to the lower salinity conditions of the Baltic Sea. Moreover, the species exhibiting population structure have a range of patterns of genetic diversity in comparison to the North Sea, from lower in the Baltic Sea to higher in the Baltic Sea, or equally diverse in North and Baltic Sea. Main conclusions: Our results indicate that the Baltic Sea should be considered a diversification hotspot: The diversity of genetic patterns points towards independent trajectories in the Baltic compared to the North Sea. At the same time, we found limited evidence for the traditional scenario of the Baltic Sea as a population sink with lower diversity and strong gene flow. The North Sea - Baltic Sea region provides a unique setting to study evolutionary adaptation during colonization processes at different stages by jointly considering native and non-native species.

scholarly journals Relative impacts of multiple human stressors in estuaries and coastal waters in the North Sea–Baltic Sea transition zone

2020 ◽  
Vol 704 ◽  
pp. 135316 ◽  
Author(s):  
Jesper H. Andersen ◽  
Zyad Al-Hamdani ◽  
E. Thérèse Harvey ◽  
Emilie Kallenbach ◽  
Ciarán Murray ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Transition Zone ◽  
North Sea ◽  
Coastal Waters ◽  
The North ◽  
The North Sea

scholarly journals The impacts of physical processes on oxygen variations in the North Sea-Baltic Sea transition zone

2011 ◽  
Vol 8 (4) ◽  
pp. 1723-1755 ◽  
Author(s):  
L. Jonasson ◽  
Z. Wan ◽  
J. H. S. Hansen ◽  
J. She
Keyword(s):  
Dissolved Oxygen ◽  
Baltic Sea ◽  
Transition Zone ◽  
North Sea ◽  
Late Summer ◽  
Physical Processes ◽  
The North ◽  
The North Sea ◽  
Seasonal Hypoxia ◽  
Benthic Ecosystems

Abstract. The bottom water of the North Sea-Baltic Sea transition zone suffers from seasonal hypoxia, usually during late summer and autumn. These hypoxic events are critical for the benthic ecosystems and the concentration of dissolved oxygen is an important measure of the water quality. However, to model the subsurface dissolved oxygen is a major challenge, especially in estuaries and coastal regions. In this study a simple oxygen consumption model is coupled to a 3-D hydrodynamical model in order to analyse oxygen variations in the transition zone. The benthic and pelagic consumption of oxygen is modelled as a function of water temperature and oxygen concentration. A quantitative assessment of the model demonstrates that the model is able to resolve both seasonal and interannual variations in dissolved oxygen. Results from several experimental simulations highlight the importance of physical processes in the regulation of dissolved oxygen. Advective oxygen transport and wind induced mixing are two key processes that control the extent of hypoxia in the transition zone.

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