Change search
ReferencesLink to record
Permanent link

Direct link
The enemy release hypothesis may contribute to explain the invasion success of Marenzelleria arctia (Polychaeta) in the Baltic Sea
Stockholm University, Faculty of Science, Department of Systems Ecology.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

The invasive genus Marenzelleria spp. was introduced into the Baltic Sea during the 1980’s, and currently, three species of Marenzelleria are present in the Baltic Sea. Since its introduction, the genus has become wide-spread and abundant across the whole Baltic Sea and in deeper soft-bottoms, the species Marenzelleria arctia has established itself very successfully. Several hypotheses for the success of this introduced species have been suggested, e.g. better tolerance to pollutants and poor oxygen conditions, superior competitive ability for resources and low predation pressure from native predators. A predation experiment with several species of Baltic Sea deposit feeders as prey, including the non-indigenous M. arctia, was performed. The three major invertebrate predators in the area were used in the experiment, the isopod Saduria entomon, the priapulid Halicryptus spinulosus and the polychaete Bylgides sarsi. The results show that due to its ability to bury deeper than native fauna, M. arctia is well protected from the native invertebrate predators. Thus, the enemy release hypothesis may help explain the invasion success of M. arctia in addition to its utilization of a previously empty niche. Furthermore, a conceptual model over the main community interactions in Baltic Sea soft-bottoms after the introduction of M. arctia is presented.

Keyword [en]
Invasive species, Enemy release, Predation, Baltic Sea, Benthic food-web interactions, Sediment, Marenzelleria
URN: urn:nbn:se:su:diva-38892OAI: diva2:317279
Available from: 2010-05-03 Created: 2010-05-03 Last updated: 2010-05-05Bibliographically approved
In thesis
1. The importance of biodiversity for ecosystem processes in sediments: experimental examples from the Baltic Sea
Open this publication in new window or tab >>The importance of biodiversity for ecosystem processes in sediments: experimental examples from the Baltic Sea
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Betydelsen av biologisk mångfald för ekosystemprocesser i sediment : experimentella exempel från Östersjön
Abstract [en]

Aquatic sediments are, by surface, the largest habitat on Earth. A wide diversity of organisms inhabit these sediments and by their actions they have a large influence on and also mediate many ecosystem processes. Several of these processes, such as decomposition and remineralisation of organic matter are important on a global scale and are essential to sustain life on Earth. The main aim of this thesis was to use an experimental ecosystem ecology approach in order to study some of these ecosystem processes in marine sediments and how they are linked to biodiversity.

Paper I and II found that an increased species richness of sediment deposit feeders increases the processing of organic matter from phytoplankton settled on the sea-floor, and that species-rich communities have a more efficient resource utilization of deposited organic matter. The results in paper IV and V also suggest that there is a link between microbial diversity in sediments and the degradation of organic contaminants. Paper V also shows that antibiotic pollution is a potential threat to natural microbial diversity and microbially mediated ecosystem services. The introduction of invasive species to ecosystems is another major threat to biodiversity and was studied in Paper II and III, by investigating the ecology of Marenzelleria arctia, a polychaete worm recently introduced in the Baltic Sea. Paper II suggests that M. arctia mainly utilize food resources not used by native deposit feeders, thus potentially increasing the benthic production in the Baltic Sea by increasing resource use efficiency. Paper III, however, show that M. arctia is protected from predation by the native benthic invertebrate predators, due to its ability to burrow deep in the sediment, suggesting that predation on M. arctia by higher trophic levels is restricted, thereby limiting trophic transfer.

In conclusion, this thesis gives some examples of the importance of marine biodiversity for the generation of a few key ecosystem processes, such as organic matter processing and the degradation of harmful contaminants.

Place, publisher, year, edition, pages
Stockholm: Department of Systems Ecology, Stockholm University, 2010. 37 p.
Biodiversity, Soft-bottom sediment, Ecosystem processes, Ecosystem function, Benthic-pelagic coupling, Baltic Sea, Trophic interactions, Pollutant biodegradation, Organic matter mineralization, Deposit feeder, Detritivore, Invasive species
National Category
Research subject
Marine Ecotoxicology
urn:nbn:se:su:diva-38893 (URN)978-91-7447-087-1 (ISBN)
Public defence
2010-06-04, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 13:00 (English)
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 3: Manuscript. Paper 4: In press. Available from: 2010-05-11 Created: 2010-05-03 Last updated: 2010-05-05Bibliographically approved

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Näslund, Johan
By organisation
Department of Systems Ecology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 83 hits
ReferencesLink to record
Permanent link

Direct link