Title

The Influence of Ambient Temperature on the Daily Variation of Serum Cortisol in the Banded Killifish, Fundulus diaphanus

Document Type

Article

Publication Date

1984

Publication Title

Journal of Interdisciplinary Cycle Research

Keywords

Daily variation, Cortisol, Temperature, Fundulus diaphanus

ISSN

0022-1945

Volume

15

Issue/No.

1

First Page

3

Last Page

8

Abstract

Separate groups of banded killifish, Fundulus diaphanus, were maintained on a LD 12:12 photoregime at either 5° or 20°C for a total duration of 16 days. Following this acclimation period, blood samples were taken by cardiac puncture at six different times of day and analyzed for serum cortisol by radioimmunoassay. Fish acclimated to 20°C had a unimodal daily pattern of serum cortisol with the peak concentration occurring during the four hour period before the onset of light. The daily pattern of cortisol of the fish acclimated to 5°C was bimodal with peak cortisol values measured at the onset and the offset of light. These thermally induced changes in cortisol hormone patterns may be related to other temperature dependent seasonal changes such as the annual cycle of reproductive development or changes in the time of daily locomotor activity.

DOI

10.1080/09291018409359828

Peer Reviewed

Find in your library

Share

COinS