Journal archives for June 2021

June 08, 2021

Moth migration

This is a subject that has fascinated me since the 1980's. Some work I was involved with showed that some common pest species (Mythimna (Pseudaletia) unipuncta & Peridroma saucia) could not survive Canadian prairie winters. It was proposed that the moths migrated in some way from the south - US and Mexico. ( (Paywall = P)). It was unsure at the time whether it was a random migration in that the moths got up into the atmosphere and were blown by chance to the north. The inability to survive northern winter conditions Quebec ( (p)).

Studies seem to show that M. unipuncta not only migrate north, but also south in the Canadian autumn ( Later, it was proposed that the migration was a reaction to daylength and temperature - (P).

It appears as if a number of moth species undertake this migration every spring and fall. Not only that, but moths migrate into mountains, and then back to the lowlands ( It also appears that the abundance of moths in mountains seems to help sustain Grizzly Bear populations (!

As I said, this is fascinating to me.

Posted on June 08, 2021 20:14 by mamestraconfigurata mamestraconfigurata | 0 comments | Leave a comment

June 22, 2021