Место издания:Ornithological Society of Japan Tokyo, Japan
Первая страница:146
Последняя страница:146
Аннотация:Morphological diversity of BTO in Anseriformes implies the size of the receptor fields, the number and size of receptor units in the upper and lower nails, and the BTO asymmetry as a whole. Swans have the largest receptor fields and units, more than 200 sensillar ones in the maxilla and about 100 asensillar in the mandible. Geese have sensillar units both in the lower and upper nails (on average 200 and 100, respectively). Sea ducks (Mergini) have big rough sensillar units only in the lower nails, from 50 in Goosander and 60 in Scoter to 100 in Goldeney vs. 20-40 asensillar in the upper nail. Pochards have 140-150 sensillar units in the lower nail and about 35 in the upper one. Units of mandible in dabbling ducks are the tiniest and tall, total amount of them reaching 300 vs. 35-40 asensillar in the upper nail.