lnu.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Sun-basking fish benefit from body temperatures that are higher than ambient water
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
Show others and affiliations
2018 (English)In: Proceedings of the Royal Society of London. Biological Sciences, ISSN 0962-8452, E-ISSN 1471-2954, Vol. 285, no 1879, article id 20180639Article in journal (Refereed) Published
Abstract [en]

In terrestrial environments, cold-blooded animals can attain higher bodytemperatures by sun basking, and thereby potentially benefit from broaderniches, improved performance and higher fitness. The higher heat capacityand thermal conductivity of water compared with air have been universallyassumed to render heat gain from sun basking impossible for aquaticectotherms, such that their opportunities to behaviourally regulate body temperatureare largely limited to choosing warmer or colder habitats. Here wechallenge this paradigm. Using physical modelswe first showthat submergedobjects exposed to natural sunlight attain temperatures in excess of ambientwater. We next demonstrate that free-ranging carp (Cyprinus carpio) canincrease their body temperature during aquatic sun basking close to thesurface. The temperature excess gained by basking was larger in dark thanin pale individuals, increased with behavioural boldness, and was associatedwith faster growth. Overall, our results establish aquatic sun basking as a novelecologically significant mechanism for thermoregulation in fish. The discoveryof this previously overlooked process has practical implications for aquaculture,offers alternative explanations for behavioural and phenotypicadaptations, will spur future research in fish ecology, and calls for modificationsof models concerning climate change impacts on biodiversity inmarine and freshwater environments.

Place, publisher, year, edition, pages
2018. Vol. 285, no 1879, article id 20180639
National Category
Ecology Evolutionary Biology
Research subject
Natural Science, Ecology
Identifiers
URN: urn:nbn:se:lnu:diva-75330DOI: 10.1098/rspb.2018.0639ISI: 000433506100024OAI: oai:DiVA.org:lnu-75330DiVA, id: diva2:1215049
Available from: 2018-06-07 Created: 2018-06-07 Last updated: 2018-11-16Bibliographically approved
In thesis
1. Intraspecific diversity of pike (Esox lucius) in the Baltic Sea and new insights on thermoregulation in fish
Open this publication in new window or tab >>Intraspecific diversity of pike (Esox lucius) in the Baltic Sea and new insights on thermoregulation in fish
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Inomartsvariation hos gädda (Esox lucius) i Östersjön och nya insikter om temperaturreglering hos fisk
Abstract [en]

Fish display a fascinating variation in behavior, morphology and physiology among species, among individuals within species, and within individuals over time. A central quest in ecology and evolution is to understand causes and consequences of such variation. This thesis aims to contribute to this knowledge by: (1) investigating the evolutionary processes that shape intraspecific variation among sympatric subpopulations of pike in coastal areas of the Baltic Sea; and (2) exploring whether fish can utilize sun-basking to regulate body temperature and whether this has any consequences for fitness.

Identifying barriers that delineate populations is a first step towards evaluating the evolutionary origin of intraspecific variation. This thesis reports on genetic population structures among co-existing pike in the coastal Baltic Sea separated by homing behavior, different spawning strategies and geographic barriers. Field studies revealed that these subpopulations also show phenotypic divergence in reproductive and meristic traits. Experimental studies suggested that differentiation among subpopulations likely was a result of divergent selection and local adaptations to spawning grounds. These adaptations that may further reinforce barriers among subpopulations due to a reduced success of immigrant genotypes.

For the second aim of the thesis, we first studied seasonal and diel patterns of activity and vertical migration among the Baltic Sea pike. The results suggested that pike exposed themselves to sunlight during spring and summer, and that body temperatures were positively correlated with sun exposure during these basking events. This was followed by experimental studies on inanimate physical models and a field study on carp which demonstrated that fish can become warmer than ambient water when exposed to sun light, a previously overlooked mechanism for fish thermoregulation, and that the heat gain was positively correlated with growth.

This thesis contributes to our understanding of the origin and maintenance of intraspecific variation among coexisting populations with direct implications for management of pike. It also establishes sun-basking as a novel mechanism for fish to obtain body temperatures in excess of ambient water which could motivate adaptations, both evolutionary and plastic, that optimize heat gain, affect spatiotemporal distributions and biotic interaction within and among species.

Place, publisher, year, edition, pages
Växjö: Linnaeus University Press, 2018. p. 39
Series
Linnaeus University Dissertations ; 340
Keywords
adaptive divergence, Cyprinus carpio, ecology, Esox lucius, evolution, local adaptation, management, thermoregulation, sun-basking, vertical migration
National Category
Evolutionary Biology Ecology
Research subject
Ecology, Aquatic Ecology; Ecology, Evolutionary Biology
Identifiers
urn:nbn:se:lnu:diva-78842 (URN)978-91-88898-24-1 (ISBN)978-91-88898-25-8 (ISBN)
Public defence
2018-12-07, Fullriggaren, Landgången 4, Kalmar, 09:30 (English)
Opponent
Supervisors
Available from: 2018-11-16 Created: 2018-11-16 Last updated: 2018-11-16Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full text

Authority records BETA

Nordahl, OscarTibblin, PetterKoch-Schmidt, PerBerggren, HannaLarsson, PerForsman, Anders

Search in DiVA

By author/editor
Nordahl, OscarTibblin, PetterKoch-Schmidt, PerBerggren, HannaLarsson, PerForsman, Anders
By organisation
Department of Biology and Environmental Science
In the same journal
Proceedings of the Royal Society of London. Biological Sciences
EcologyEvolutionary Biology

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 48 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf