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2017 | OriginalPaper | Buchkapitel

8. The pelagic food web

verfasst von : Agneta Andersson, Timo Tamminen, Sirpa Lehtinen, Klaus Jürgens, Matthias Labrenz, Markku Viitasalo

Erschienen in: Biological Oceanography of the Baltic Sea

Verlag: Springer Netherlands

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Abstract

1.
Environmental drivers and food web structure in the pelagic zone vary from south to north in the Baltic Sea.
 
2.
While nitrogen is generally the limiting nutrient for primary production in the Baltic Sea, phosphorus is the limiting nutrient in the Bothnian Bay.
 
3.
In the Gulf of Bothnia the food web is to a large extent driven by terrestrial allochthonous material, while autochthonous production dominates in the other parts of the Baltic Sea.
 
4.
Changes in bacterioplankton, protist and zooplankton community composition from south to north are mainly driven by salinity.
 
5.
Bacteria are crucial constituents of the pelagic food web (microbial loop) and in oxygen-poor and anoxic bottom waters where they mediate element transformations.
 
6.
Diatoms and dinoflagellates are the major primary producers in the pelagic zone. Summer blooms of diazotrophic (nitrogen-fixing) filamentous cyanobacteria are typical of the Baltic Sea, especially in the Baltic Sea proper and the Gulf of Finland.
 
7.
The mesozooplankton (mainly copepods and cladocerans) channel energy from primary producers and the microbial food web to fish and finally to the top predators in the pelagic system (waterbirds and mammals).
 
8.
Herring and sprat populations are affected by the foraging intensity of their main predator (cod), and therefore the environmental conditions that affect cod may also influence mesozooplankton due to food web effects “cascading down the food web”.
 
9.
Anthropogenic pressures, such as overexploitation of fish stocks, eutrophication, climate change, introduction of non-indigenous species and contamination of top predators by hazardous substances, cause changes in the pelagic food web that may have consequences for the balance and stability of the whole ecosystem.
 

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Metadaten
Titel
The pelagic food web
verfasst von
Agneta Andersson
Timo Tamminen
Sirpa Lehtinen
Klaus Jürgens
Matthias Labrenz
Markku Viitasalo
Copyright-Jahr
2017
Verlag
Springer Netherlands
DOI
https://doi.org/10.1007/978-94-007-0668-2_8