Change search
ReferencesLink to record
Permanent link

Direct link
Trends, changes and uncertainties in bycatch of common murres in the Baltic Sea
Stockholm University, Stockholm Resilience Centre.
Stockholm University, Stockholm Resilience Centre, Baltic Nest Institute.
Swedish Museum of Natural History.
Stockholm University, Stockholm Resilience Centre.ORCID iD: 0000-0002-3201-9262
Show others and affiliations
(English)Manuscript (preprint) (Other academic)
National Category
Natural Sciences
URN: urn:nbn:se:su:diva-83750OAI: diva2:576784
Available from: 2012-12-13 Created: 2012-12-13 Last updated: 2015-11-13Bibliographically approved
In thesis
1. Man, murres and modern fisheries: A case study in the Baltic Sea
Open this publication in new window or tab >>Man, murres and modern fisheries: A case study in the Baltic Sea
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Overfishing and climate change put increasing pressure on marine systems, with effects on commercially targeted fish and top predators dependent on these resources. To achieve sustainable resource use, governance mechanisms need to incorporate knowledge about ecosystem dynamics. Another key for success is the perception among actors about the challenges oceans are facing. Seabirds have become well-known symbols of coasts and oceans and their struggles with the consequences of human actions provide an illustration of the need to properly govern marine resources. Seabirds can be useful indicators of states of marine systems, forming tools that can help informing ecosystem approaches to management. The thesis focuses on the piscivorous seabird the common murre Uria aalge in the Baltic Sea, investigating two different aspects of interactions between seabirds and fisheries. In paper I, the effects of food quality and quantity during the chick-rearing period were investigated. Food quality (sprat Sprattus sprattus weight-at-age), but not quantity (sprat abundance), was positively related to murre fledging success. The adjustments of parental effort in relation to quality and quantity showed the opposite pattern – no relationships between parental effort and sprat weight-at-age but a negative relationship between sprat abundance and the duration of foraging trips. Paper II uses a long-term ring recovery dataset to study murre bycatch in Baltic Sea fisheries. We found an increase in the proportion bycatch between 1972 and 2008, and a strong bimodal intraannual pattern in bycatches, with peaks in spring and autumn, similar in three investigated periods. Uncertain finding dates were common and could potentially affect conclusions about intraannual patterns. Reported bycatches were concentrated to waters around the Hel peninsula, Poland. In recent years, 2000-2008, an increase of reported bycatch could be observed in the southeastern parts of the Baltic Sea. The findings of this thesis can aid the selection and interpretation of indicators for ecosystem approaches to Baltic Sea fisheries management, and further be used to communicate the need for such approaches.

Place, publisher, year, edition, pages
Stockholm: Department of Systems Ecology, Stockholm University, 2012. 18 p.
Seabirds, ecosystem dynamics, fisheries, indicators, ecosystem services, Baltic Sea, common murre, common guillemot, Uria aalge
National Category
Biological Sciences
Research subject
Natural Resources Management
urn:nbn:se:su:diva-68704 (URN)
2012-01-30, Room 312, Stockholm Resilience Centre, Kräftriket 2 B, Stockholm, 10:00 (English)

At the time of the defence the following paper was unpublished and had a status as follows: Paper nr 2: Manuscript

Available from: 2012-11-30 Created: 2012-01-05 Last updated: 2012-12-14Bibliographically approved

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Kadin, MartinaÖsterblom, HenrikHentati-Sundberg, JonasOlsson, Olof
By organisation
Stockholm Resilience CentreBaltic Nest Institute
Natural Sciences

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: 53 hits
ReferencesLink to record
Permanent link

Direct link