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Genetic Aspects of Sexual Selection and Mate Choice in Salmonids
Södertörn University, School of Life Sciences.
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The long-term genetic consequences of supportive breeding programs are not well understood. Nevertheless, stocking populations with hatchery-produced fish to compensate for losses of natural production are common practice, for example after constructions of hydroelectric power dams. Hatcheries typically fertilize eggs using ‘mixed-milt fertilizations’, without consideration to natural reproductive behaviours, and hence, natural selective regimes would be altered.

Here, a series of experiments with focus on Mhc and mate choice in a population of brown trout (Salmo trutta L.) with a history of long-term stocking are presented. The major histocompatibility complex (Mhc) constitutes of genes coding for antigen presentation in the vertebrate immune system. In addition to the immunological function, Mhc genes might also influence reproductive behaviours such as mate choice. For example, in some species individuals are able to recognize Mhc genotypes of potential mates and to some extent base their mate choice on this information. Here, I address these questions on brown trout. Can the phenomena be observed in brown trout? Could such mechanisms help individuals to avoid inbreeding, or are other mechanisms important? How does the artificial rearing of fish for enhancement of natural populations relate to these issues?

The results presented here, in combination with previous work, shows that several factors are important in the process of pair formation in salmonid species. For example, females of the studied population used more than a single criterion when choosing among the available mates Mhc genes and males with certain Mhc genotypes achieved more matings, possibly an effect from increased fighting ability. Further, the population appears to contain an unnatural high level of Mhc variation, and some results indicate that the population might suffer from outbreeding depression at the Mhc. These negative effects are most likely derived from compression of sub-populations after dam-construction, in combination with supportive breeding with no consideration to natural spawning behaviour.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2008. , 67 p.
Series
Södertörn Doctoral Dissertations, ISSN 1652-7399 ; 30
Series
, Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 436
Keyword [en]
Biology, mate choice, Mhc, Major histocompatibility complex, class IIB, disassortative, assortative, microsatellite, outbreeding, supportive breeding, population, population genetics
Keyword [sv]
Biologi
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:sh:diva-16101ISBN: 978-91-554-7212-2OAI: oai:DiVA.org:sh-16101DiVA: diva2:517243
Public defence
2008-05-28, MA 636, Moas Båge, Alfred Nobels Allé 7, 10:00 (English)
Opponent
Supervisors
Available from: 2012-04-23 Created: 2012-04-23 Last updated: 2012-04-23Bibliographically approved
List of papers
1. Influence of genetic dissimilarity in the reproductive success and mate choice of brown trout - females fishing for optimal MHC dissimilarity
Open this publication in new window or tab >>Influence of genetic dissimilarity in the reproductive success and mate choice of brown trout - females fishing for optimal MHC dissimilarity
2007 (English)In: Journal of Evolutionary Biology, ISSN 1010-061X, E-ISSN 1420-9101, Vol. 20, no 5, 1859-1869 p.Article in journal (Refereed) Published
Abstract [en]

We examined the reproductive success of 48 adult brown trout (Salmo trutta L.) which were allowed to reproduce in a stream that was controlled for the absence of other trout. Parentage analyses based on 11 microsatellites permitted us to infer reproductive success and mate choice preferences in situ. We found that pairs with intermediate major histocompatibility complex (MHC) dissimilarity mated more often than expected by chance. It appears that female choice was the driving force behind this observation because, compared with other individuals, males with intermediate MHC dissimilarity produced a larger proportion of offspring, whereas female reproductive output did not show this pattern. Hence, rather than seeking mates with maximal MHC dissimilarity, as found in several species, brown trout seemed to prefer mates of intermediate MHC difference, thus supporting an optimality-based model for MHC-dependent mate choice.

National Category
Biological Sciences
Identifiers
urn:nbn:se:sh:diva-5567 (URN)10.1111/j.1420-9101.2007.01380.x (DOI)000249166200022 ()17714303 (PubMedID)2-s2.0-34547890262 (ScopusID)
Available from: 2011-01-18 Created: 2011-01-18 Last updated: 2016-09-19Bibliographically approved
2. Mate choice in brown trout (Salmo trutta L.) - females prefer MHC intermediate males in a fluviarium
Open this publication in new window or tab >>Mate choice in brown trout (Salmo trutta L.) - females prefer MHC intermediate males in a fluviarium
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(English)Article in journal (Refereed) Submitted
National Category
Natural Sciences
Identifiers
urn:nbn:se:sh:diva-16103 (URN)
Note
Som manuskript i avhandling. As manuscript in dissertation.Available from: 2008-05-06 Created: 2012-04-23 Last updated: 2015-07-17Bibliographically approved
3. A ‘good genes’ effect from MHC super-genotypes in brown trout mediated by male competition and not by ornaments
Open this publication in new window or tab >>A ‘good genes’ effect from MHC super-genotypes in brown trout mediated by male competition and not by ornaments
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(English)Article in journal (Refereed) Submitted
National Category
Natural Sciences
Identifiers
urn:nbn:se:sh:diva-16102 (URN)
Note
Som manuskript i avhandling. As manuscript in dissertation.Available from: 2008-05-06 Created: 2012-04-23 Last updated: 2013-09-25Bibliographically approved
4. Sperm competition between alternative reproductive tactics of the Atlantic salmon in vitro
Open this publication in new window or tab >>Sperm competition between alternative reproductive tactics of the Atlantic salmon in vitro
2010 (English)In: Aquaculture, ISSN 0044-8486, E-ISSN 1873-5622, Vol. 302, no 04-mar, 265-269 p.Article in journal (Refereed) Published
Abstract [en]

The maintenance of brood stock in appropriate conditions is an important equirement for the production of high quality offspring. In this study, e investigated fertility of the two life history forms of Atlantic almon males, precocious parr, brought up in breeding tanks in the atchery and anadromous, migratory searanched males, caught when eturning to the home river. The sperm quality was assessed by xperiments between equal amount of sperm from one adult and one parr ale in competition to fertilize eggs of a single female. The paternity as determined by a microsatellite analysis. Parr males achieved greater eproductive success than anadromous males under competition, and nadromous adults had greater fertility in controls as compared to the perm competition situation. In total, parr males achieved 3.6 times reater fertilization success than anadromous males. Sperm ATP content ontributed significantly to male fertility. Our results provide vidence that ejaculates of precociously mature Atlantic salmon parr are f increased quality as an adaptation to high sperm competition ntensity due to better maintenance in the fish farm than in the wild.

National Category
Biological Sciences
Identifiers
urn:nbn:se:sh:diva-13710 (URN)10.1016/j.aquaculture.2010.02.024 (DOI)000277851300018 ()2-s2.0-77950594907 (ScopusID)
Note

Som manuskript i avhandling. As manuscript in dissertation.

Available from: 2011-12-06 Created: 2011-12-06 Last updated: 2014-02-13Bibliographically approved
5. Homozygote disadvantage at the MHC: more evidence for outbreeding depression
Open this publication in new window or tab >>Homozygote disadvantage at the MHC: more evidence for outbreeding depression
(English)Manuscript (preprint) (Other academic)
National Category
Natural Sciences
Identifiers
urn:nbn:se:sh:diva-16104 (URN)
Note
Som manuskript i avhandling. As manuscript in dissertation.Available from: 2008-05-06 Created: 2012-04-23 Last updated: 2013-09-25Bibliographically approved

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