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Studies on Baltic Sea mysids
Stockholm University, Faculty of Science, Department of Systems Ecology.
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 [en]
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: urn:nbn:se:su:diva-75236ISBN: 978-91-7447-510-4 (print)OAI: oai:DiVA.org:su-75236DiVA: diva2:515241
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
List of papers
1. Multifrequency discrimination of fish and mysids
Open this publication in new window or tab >>Multifrequency discrimination of fish and mysids
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.

National Category
Ecology
Identifiers
urn:nbn:se:su:diva-32680 (URN)10.1093/icesjms/fsp131 (DOI)000267221600020 ()
Available from: 2009-12-15 Created: 2009-12-15 Last updated: 2017-12-12Bibliographically approved
2. Status and vertical size distributions of a pelagic mysid community in the northern Baltic proper
Open this publication in new window or tab >>Status and vertical size distributions of a pelagic mysid community in the northern Baltic proper
2012 (English)In: Boreal environment research, ISSN 1239-6095, E-ISSN 1797-2469, Vol. 18, no 1, 1-18 p.Article in journal (Refereed) Published
Abstract [en]

We report on abundance, biomass, trophic position and vertical size distribution of pelagic mysids (Mysis mixta, Mysis relicta/salemaai, Neomysis integer) in a coastal Baltic Proper area. As compared with the situation in this area in the 1980s, the formerly dominating M. mixta has declined and the total mysid biomass decreased by 50%. Neomysis integer now constitutes the bulk of the mysids. Stable isotopes indicate that they feed on a lower trophic level than Mysis spp., and M. relicta appears more carnivorous than M. mixta. For N. integer, size increases with depth and decreases with in situ light. This was not found for Mysis spp., probably due to their narrow size span and smaller sample size than for N. integer. In N. integer, in situ light explained the size variation with depth better than temperature, indicating that this variation is a response to predation rather than size-related thermal preference.

National Category
Ecology
Research subject
Marine Ecology
Identifiers
urn:nbn:se:su:diva-75262 (URN)000314447100001 ()
Available from: 2012-04-12 Created: 2012-04-12 Last updated: 2017-12-07Bibliographically approved
3. Persistent lack of diel vertical migration in a pelagic mysid population: a case of partial migration
Open this publication in new window or tab >>Persistent lack of diel vertical migration in a pelagic mysid population: a case of partial migration
(English)Manuscript (preprint) (Other academic)
National Category
Ecology
Research subject
Marine Ecology
Identifiers
urn:nbn:se:su:diva-75263 (URN)
Available from: 2012-04-12 Created: 2012-04-12 Last updated: 2012-04-13Bibliographically approved
4. A weight and temperature dependent model of respiration in Praunus flexuosus (Crustacea, Mysidacea)
Open this publication in new window or tab >>A weight and temperature dependent model of respiration in Praunus flexuosus (Crustacea, Mysidacea)
2012 (English)In: Journal of Plankton Research, ISSN 0142-7873, E-ISSN 1464-3774, Vol. 34, no 7, 642-645 p.Article in journal (Refereed) Published
Abstract [en]

The mysid shrimp Praunus flexuosus is common in littoral habitats in the Baltic Sea and other marine areas, but its bioenergetic characteristics have not been studied. We present the first model of its routine respiration rate as a function of size and a natural temperature range. The model explained 87% of the variance in respiration, indicating that it could be useful in a larger modeling framework. Specific respiration rates and temperature dependence were consistent with previous reports for this and other littoral mysids at low-to-moderate temperatures. Respiration at higher temperatures was lower, indicating that previous reports may have been biased by residual SDA (specific dynamic action) effects. Increased respiration due to SDA was detectable over a longer period than previously reported, ∼30 h.

Keyword
Specific dynamic action (SDA), mysids, routine metabolic rate, bioenergetics, size, temperature, oxygen consumption
National Category
Ecology
Research subject
Marine Ecology
Identifiers
urn:nbn:se:su:diva-75284 (URN)10.1093/plankt/fbs030 (DOI)000304834500007 ()
Available from: 2012-04-13 Created: 2012-04-13 Last updated: 2017-12-07Bibliographically approved

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