Cookies Policy
X
Cookie Policy

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies.

I accept this policy

Find out more here

Assessing niche differences of sex, armour and asymmetry phenotypes using stable isotope analyses in Haida Gwaii sticklebacks

No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
MyBook is a cheap paperback edition of the original book and will be sold at uniform, low price.

Buy this article

Price:
$30.00+ Tax (if applicable)
Add to Favorites

image of Behaviour

Identifying phenotype-specific selective landscapes within populations continues to challenge evolutionary biologists in studies of adaptive variation. We explore here the potential application of carbon and nitrogen stable isotope ratios of tissues as time-integrated proxies of niche space among sex, armour and asymmetry phenotypes within an endemic population of giant threespine stickleback from Haida Gwaii, western Canada. Muscle tissues were extracted from 289 stickleback collected from Drizzle Lake, taken in transects during June 1981, June 1982, September 1982 and June 1983 and isotopic ratios of 15N/14N (δ 15N) and 13C/12C (δ 13C) determined by continuous-flow isotope ratio mass spectrometry. Among all fish, δ 15N values, which reflect relative trophic level, ranged from 6.5‰ to 10.6‰ while δ 13C, which reflects reliance on different carbon pathways of primary producers, ranged from −30.5‰ to −27.5‰. The sexes did not differ in δ 15N but females were significantly enriched in δ 13C relative to males among all samples. In each transect, lateral plate phenotypes differed in δ 15N, with higher plate counts generally enriched in 15N. δ 13C did not vary among plate pheno-types. Approximately 50% of the adult population exhibit lateral plate asymmetries usually with one plate different between sides. Sticklebacks that were asymmetric (absolute asymmetry) did not differ from symmetric fish for either δ 15N or δ 13C signatures. However, this result masked a significant and consistent effect of signed asymmetries (right side – left side), with δ 15N enrichment among right-biased compared to left-biased asymmetric. These unexpected results indicate the presence of subtle and previously unrecognized niche differences in lateral plate number and asymmetry phenotypes and are consistent with the predictions of niche-width and adaptive variation hypotheses. The results also suggest the wider application of isotopic techniques to elucidate phenotype-specific ecological and selective landscapes.

Loading

Article metrics loading...

/content/journals/10.1163/156853908792451449
2008-04-01
2015-05-26

Affiliations: 1: Department of Biology, University of Victoria, P.O. Box 3020, Victoria, BC, Canada V8W 3N5

Sign-in

Can't access your account?
  • Tools

  • Add to Favorites
  • Printable version
  • Email this page
  • Subscribe to email alerts
  • Get permissions
  • Recommend to your library

    You must fill out fields marked with: *

    Librarian details
    Name:*
    Email:*
    Your details
    Name:*
    Email:*
    Department:*
    Why are you recommending this title?
    Select reason:
     
     
     
     
    Other:
     
    Behaviour — Recommend this title to your library

    Thank you

    Your recommendation has been sent to your librarian.

  • Export citations
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation