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Multifrequency discrimination of fish and mysids
e of Freshwater Research, Swedish Board of Fisheries.
Stockholm University, Faculty of Science, Department of Systems Ecology.
e of Freshwater Research, Swedish Board of Fisheries.
Stockholm University, Faculty of Science, Department of Systems Ecology.
2009 (English)In: ICES Journal of Marine Science, ISSN 1054-3139, E-ISSN 1095-9289, Vol. 66, no 6, 1106-1110 p.Article in journal (Refereed) Published
Abstract [en]

The opossumshrimp (Mysis relicta) is common in many lakes in the northernparts of Eurasia and North America. The shrimp is often an importantlink in the foodweb for fish, either throughout life or in earlylife stages. Generally, quantitative measurements of mysidsin large volumes of water are difficult to obtain with traditionalsampling methods. In this pilot study, measurements of volume-backscatteringstrength (Sv) at 38, 120, and 200 kHz were used to separatebackscattering from fish and mysids. Mysids were sampled withtrawls. Where mysids were caught, the correlations between mysidbiomass (dry weight) and mean Sv at 120 and 200 kHz were positive(r2 = 0.89 and 0.81, respectively). Where mysids were abundant,the Sv exhibited a characteristic frequency response. This wasnot found where mysids were scarce or absent. Therefore, areaswith great abundances of mysids can be identified, and theirbiomasses estimated from data collected during ecosystem monitoring.

Place, publisher, year, edition, pages
2009. Vol. 66, no 6, 1106-1110 p.
National Category
Ecology
Identifiers
URN: urn:nbn:se:su:diva-32680DOI: 10.1093/icesjms/fsp131ISI: 000267221600020OAI: oai:DiVA.org:su-32680DiVA: diva2:281341
Available from: 2009-12-15 Created: 2009-12-15 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Studies on Baltic Sea mysids
Open this publication in new window or tab >>Studies on Baltic Sea mysids
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Mysid shrimps (Mysidacea, Crustacea) are efficient zooplanktivores in both marine and freshwater systems as well as lipid rich prey for many species of fish.  Although some efforts have been made to study the role of mysids in the Baltic Sea, very few studies have been carried out in recent time and there are still knowledge gaps regarding various aspects of mysid ecology. This thesis aims to explore some of these gaps by covering a mixture of topics.

Using multifrequency hydroacoustics we explored the possibility to separate mysids from fish echoes and successfully established a promising and effective method for obtaining mysid abundance/biomass estimates (paper I). An investigation of the current mysid community in a coastal area of the northern Baltic proper (paper II) demonstrated that the formerly dominant, pelagic mysid Mysis mixta had decreased substantially (~50%) in favor for phytoplanktivorous, juvenile Neomysis integer and Mysis relicta sp.

By examining different aspects of mysid behavior, we studied the vertical size distribution of mysids in the field and found that size increased with depth/declining light, irrespective of temperature; indicating that their vertical size distribution primarily is a response to predation (paper II). In paper III, a combination of ecological and genetic markers was used to investigate intraspecific differences in migratory tendency. Both marker types indicated that some part of the Mysis salemaai population is sedentary on the bottom and that this strategy is a phenotypically plastic but persistent trait, analogous to the partial migrations seen in many birds and fishes.

In paper IV a temperature and weight specific respiration model was developed for the littoral Praunus flexuosus. Routine respiration was moreover elevated by post-prandial effects (specific dynamic action) for longer times than previously suggested. Consequently, ignoring such effects could significantly bias respiration measurements. 

Place, publisher, year, edition, pages
Stockholm: Department of Systems Ecology, Stockholm University, 2012. 31 p.
Keyword
Mysids, hydroacoustics, Baltic Sea, abundance, stable isotopes, specific dynamic action (SDA), diel vertical migration, partial migration, trophic interactions, physiology, benthic-pelagic coupling, protein:DNA, C:N ratio, genetic structure
National Category
Ecology
Research subject
Marine Ecology
Identifiers
urn:nbn:se:su:diva-75236 (URN)978-91-7447-510-4 (ISBN)
Public defence
2012-05-21, De Geersalen, Geovetenskapens hus, Svante Arrhenius väg 14, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
At the time of doctoral defence the following papers were unpublished and had a status as follows: Paper  2: Accepted; Paper 3: Submitted; Paper  4: AcceptedAvailable from: 2012-04-29 Created: 2012-04-12 Last updated: 2012-05-04Bibliographically approved

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