Piggins, David

2 publications

Piggins, David; Muntz, W. R. A.; Best, Robin Christopher (detail)

1983

Physical and morphological aspects of the eye of the manatee Trichechus inunguis Natterer 1883: (Sirenia: mammalia [sic]).
Mar. Behav. Physiol. 9(2): 111-129. 3 tabs. 3 figs.
—Examination of gross ocular anatomy, retinal histology, visual pigment, ocular refraction, and visual behavior in 5 animals showed a primarily rod retina, high receptor:ganglion cell ratio, low refractive error (hyperopia) under water, pigment based on vitamin A1, a difference spectrum of lambda max at 505 nm, a retina suited to low light levels, moderate visual acuity at best, motion perception, and a low degree of binocular vision. These results are compared with previous studies of T. manatus and Dugong.

Piggins, David (detail)
1987	Through the eyes of a sea cow. SCOPE (Brit. Assoc. Young Scientists Mag.), Issue No. 7: 4-7? 4 figs. Spring 1987. —Pop. acc. of studying the eyesight of Amazonian manatees with Robin Best in Manaus [1977].