Author:
ARRESE C. A.,RODGER J.,BEAZLEY L.D.,SHAND J.
Abstract
Microspectrophotometry indicates the presence of at least three cone
visual pigments in two Australian marsupials, the fat-tailed dunnart
(Sminthopsis crassicaudata) and honey possum (Tarsipes
rostratus). Here we have examined the distribution of cone types
using antisera, JH455 and JH492, that recognize short-wavelength-sensitive
(SWS) and medium-to-long-wavelength-sensitive (M/LWS) cone opsins,
respectively. SWS cones were concentrated in dorso-temporal retina in
the dunnart with a shallow decreasing gradient extending to the periphery
(2300–1500/mm2). In the honey possum, SWS cones showed
a uniform distribution (2700/mm2), except for a slight increase
in a narrow peripheral band (3100/mm2). In both species,
M/LWS cones dominated and their distributions were similar to those of
retinal ganglion cells: a horizontal streak in the dunnart
(31,000–21,000/mm2) and a shallow mid-ventral to
peripheral gradient in the honey possum
(37,000–26,000/mm2). A low number of cones remained
unlabeled when the antisera were combined revealing further minority cone
population(s). We discuss cone distributions in relation to visual
capabilities and requirements of the species.
Publisher
Cambridge University Press (CUP)
Subject
Sensory Systems,Physiology
Cited by
21 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献