• norsk
    • English
  • English 
    • norsk
    • English
  • Login
View Item 
  •   Home
  • Artikler, rapporter, filmer / Articles, reports, movies
  • Artikkel - fagfellevurdert vitenskapelig / Articles - peer-reviewed
  • View Item
  •   Home
  • Artikler, rapporter, filmer / Articles, reports, movies
  • Artikkel - fagfellevurdert vitenskapelig / Articles - peer-reviewed
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Spatio-temporal patterns in pelvic reduction in threespine stickleback (Gasterosteus aculeatus L.) in Lake Storvatnet

Klepaker, Tom; Østbye, Kjartan; Bernatchez, Louis; Vøllestad, L. Asbjørn
Peer reviewed, Journal article
Thumbnail
View/Open
Klepaker.pdf (364.2Kb)
URI
http://hdl.handle.net/11250/134524
Date
2012
Metadata
Show full item record
Collections
  • Artikkel - fagfellevurdert vitenskapelig / Articles - peer-reviewed [1175]
Original version
Klepaker, T., Østbye, K., Bernatchez, L., & Vøllestad, L. A. (2012). Spatio-temporal patterns in pelvic reduction in threespine stickleback (Gasterosteus aculeatus L.) in Lake Storvatnet. Evolutionary Ecology Research, 14(2), 169-191  
Abstract
Questions: The pelvic girdle with associated spines is an integrated anti-predator defence

apparatus, and is assumed to protect against piscivores in the threespine stickleback. On the

other hand, it might be costly to produce the pelvic apparatus in ion-poor and mineralchallenging

freshwater.

Hypothesis: Stickleback with a reduced pelvic apparatus should use more shelter and be

more nocturnal, avoiding predation risk. In contrast, stickleback with a well-developed pelvic

apparatus should have reduced mortality during ontogeny in encounters with piscivores

and thus have a longer expected lifespan. Given these two life-history strategies, we expect

assortative mating as a result of divergent selection.

Organism: Marine and freshwater threespine stickleback (Gasterosteus aculeatus L.).

Places and times: Two representative ancestral marine populations and 36 freshwater

populations in northwestern Norway (Lake Storvatnet, the main focus of the study, and three

lakes downstream of it). Material was collected from 2006 to 2009.

Analytical methods: We categorized nominal pelvic apparatus development (CPS morphs) in

all fish, and measured metrics associated with these categories in a subsample. We also studied

temporal, spatial, and habitat variation in the distribution of pelvic morphs in Lake Storvatnet.

In this population, and downstream populations, we contrasted the detailed pelvic morphology

with the measured genetic diversity (microsatellites), also estimating gene flow. In Lake

Storvatnet, we tested for genetic divergence and signs of potential build-up of reproductive

isolation via assortative mating among the observed nominal categories of pelvic reduction

(CPS).

Results: Pelvic reduction was seen only in Lake Storvatnet, where more than 50% of fish had

a reduced pelvis. The distribution of pelvic morphs was stable over time and did not differ

between habitats. The proportion of fish with pelvic reduction decreased with age. Freshwater stickleback tended to have a smaller pelvis than marine fish. The Lake Storvatnet stickleback

were genetically differentiated from the downstream Lake Gjerhaugsvatn population, and both

of these were different from the marine populations, with little gene flow among populations. No

apparent genetic structure was found between CPS morphs within Lake Storvatnet. However,

genetic factorial correspondence axes were significantly correlated with pelvic principal

component axes in Lake Storvatnet, suggesting some phenotype × genetic association.

Conclusion: The weak association between phenotypes and genetic structure observed in

this study may reflect the build-up of early steps of reproductive isolation. Given time, such

mechanisms may lead to the evolution of assortative mating, which may drive adaptive pelvic

morphs (niche peaks), further resulting in genetically divergent populations and pelvic morphs.
Publisher
Evolutionary Ecology
Journal
Evolutionary Ecology Research

Contact Us | Send Feedback

Privacy policy
DSpace software copyright © 2002-2019  DuraSpace

Service from  Unit
 

 

Browse

ArchiveCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsDocument TypesJournalsThis CollectionBy Issue DateAuthorsTitlesSubjectsDocument TypesJournals

My Account

Login

Statistics

View Usage Statistics

Contact Us | Send Feedback

Privacy policy
DSpace software copyright © 2002-2019  DuraSpace

Service from  Unit