Cookies 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

Altitudinal Zonation of Geometrid Larvae (Lep.) during a Mass Occurrence on Birch at Sogndal, Western Norway, I967

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.
The full text of this article is not currently available.

Brill’s MyBook program is exclusively available on BrillOnline Books and Journals. Students and scholars affiliated with an institution that has purchased a Brill E-Book on the BrillOnline platform automatically have access to the MyBook option for the title(s) acquired by the Library. Brill MyBook is a print-on-demand paperback copy which is sold at a favorably uniform low price.

Access this article

+ Tax (if applicable)
Add to Favorites
You must be logged in to use this functionality

image of Insect Systematics & Evolution

Larvae of Geometridae (Lep.) attacked the birch wood (Betula pubescens Ehrh.) in the mountain slopes near Sogndal, Sogn, in I966 and I967. Collecting of larvae were made in I967 by sweep-netting on five stations at different altitudes up to timber line at 900 m a.s. The maximum density of Operophthera sp., at about 300 m a.s., was estimated to be about five times higher than the maximum density of Oporinia autumnata Bkh. just below the timber line. A horizontal, brownish belt, where the trees were heavily defoliated, extended from approximately 250 to 350 m a.s. The trees near the timber line were not so heavily defoliated. The least defoliated trees were found at about 650-700 m a.s., in the overlapping zone of the two geometrid species. Operophthera sp. was found at all altitudes, while O. autumnata occurred only in the upper half of the birch wood. Erannis aurantiaria Hb. and E. defoliaria Cl. also occurred at all altitudes. The former preferred the lower part of the birch wood, and was always present in densities lower than O. autumnata's highest density. Only a few larvae of E. defoliaria were found, without showing any altitudinal preference.

Affiliations: 1: Zoological Laboratory, University of Oslo, Blindern, Oslo 3, Norway


Full text loading...


Data & Media loading...

Article metrics loading...



Can't access your account?
  • Tools

  • Add to Favorites
  • Printable version
  • Email this page
  • Subscribe to ToC alert
  • Get permissions
  • Recommend to your library

    You must fill out fields marked with: *

    Librarian details
    Your details
    Why are you recommending this title?
    Select reason:
    Insect Systematics & Evolution — Recommend this title to your library
  • Export citations
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation