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2017 | OriginalPaper | Buchkapitel

2. Why is the Baltic Sea so special to live in?

verfasst von : Pauline Snoeijs-Leijonmalm, Elinor Andrén

Erschienen in: Biological Oceanography of the Baltic Sea

Verlag: Springer Netherlands

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Abstract

Geographical position, geological development, hydrographical features, climate and physical drivers together create the Baltic Sea environment.

Baltic Sea water is brackish and characterised by pronounced salinity gradients, both in horizontal and vertical directions, because of the large volume of freshwater runoff from over 100 rivers, which mixes with the saline water from the Kattegat that enters the Baltic Sea via narrow shallow straits.

Being a semi-enclosed continental sea with a large drainage area compared to its water volume, the Baltic Sea ecosystem is heavily impacted by the surrounding landmasses.

The water residence time in the Baltic Sea is long (30–40 years), and therefore discharged nutrients and toxic compounds circulate within the sea for a long time, which contributes to its vulnerability to eutrophication and chemical contamination by hazardous substances.

The Baltic Sea Area is geologically young and the Baltic Sea ecosystem is extremely young in an evolutionary perspective. Only few macroscopic species are fully adapted to its low-salinity environment.

Chief factors that affect species distributions in the Baltic Sea along local, regional and ecosystem-wide gradients are salinity, climate, ice cover, currents, permanent salinity stratification, hypoxia, and benthic substrate types (rock, sand, mud).

Environmental drivers vary either in time or space or both and contribute to the north-south “large-scale Baltic Sea gradient”, along which many species experience physiological stress, lose the ability to reproduce sexually and reach the ecological limit of their occurrence.

In an ecosystem-wide perspective, the large-scale Baltic Sea gradient is the principal ecological characteristic of the Baltic Sea.

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Vorheriges Kapitel Brackish water as an environment

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Titel: Why is the Baltic Sea so special to live in?
verfasst von: Pauline Snoeijs-Leijonmalm
Elinor Andrén
Verlag: Springer Netherlands
Buch: Biological Oceanography of the Baltic Sea
Print ISBN: 978-94-007-0667-5

Electronic ISBN: 978-94-007-0668-2

Copyright-Jahr: 2017
DOI: https://doi.org/10.1007/978-94-007-0668-2_2