Publication Date

4-1982

Advisor(s) - Committee Chair

Blaine Ferrell, Herbert Shadowen, Joe Winstead

Comments

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Degree Program

Department of Biology

Degree Type

Master of Science

Abstract

A study was conducted to explore the possibility that the Purple Finch (Carpodacus purpureus) is a diurnal migrant. Males captured from winter flocks were placed in individual cages located within photoperiodic chambers and held under non-stimulatory photoperiodic conditions (LD 8:16) until late spring, at which time they were divided unto two groups. Each of these experimental groups was subdivided into two treatment groups. Birds in one treatment croup remained under short photoperiodic conditions (LD 8:16). The remaining birds in each group were placed under stimulatory photoperiodic conditions 31 May 1981 (LD 15:9, Group 1) and 20 July 1981 (LD 14:10, Group 2). Body weight, subcutaneous fat stores, and molt were monitored on a weekly basis; testicular growth was assessed by laparotomy at appropriate intervals; and locomotor activity was recorded daily using an Esterline-Angus event recorder in order to determine seasonal condition. Photostimulated Purple Finches that were considered to be in a migratory condition (i.e., increased fat stores) were tested for orientational activity in Kramer cages located out-of-doors. Results of these tests indicated that the Purple Finch is primarily a diurnal migrant, but has the capability of migrating during moonlit nights as well.

Disciplines

Animal Sciences | Life Sciences | Poultry or Avian Science

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