SHEDDING BY ROD PHOTORECEPTORS AFTER SUNRISE IN FISH

被引：2

作者：

ALLEN, DM

FOREMAN, MF

机构：

[1] Life Science, The University of Texas of the Permian Basin, Odessa, 79762, Texas

[2] Dallas, 75124, Texas

来源：

EXPERIENTIA | 1994年 / 50卷 / 08期

关键词：

TROUT; KILLIFISH; ROD PHOTORECEPTOR SHEDDING; SUNRISE;

D O I：

10.1007/BF01919372

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Diurnal shedding by retinal rods was studied in wild cutthroat trout, Oncorhyncus clarki, hatchery rainbow trout, Oncorhyncus mykiss, and the plains killifish, Fundulus zebrinus, by counting the shed tips of rod outer segments ingested as 'phagosomes' by pigment epithelial cells. After sunrise, phagosomes increased in all species, but fewer occurred in trout, and these were elevated from 3 to 9 hours after sunrise. Shedding occurred earlier in the light period and was more robust in killifish, with phagosomes elevated from 1.5 to 6 hours after sunset. The data suggest that both production of phagosomes by shedding and their subsequent disposal are slower at the lower temperatures experienced by trout. Otherwise, rod shedding produced under natural lighting is not appreciably different than that provoked by sudden onset of artificial light.

引用

页码：727 / 732

页数：6