EXTERNAL MORPHOLOGY OF DALLS PORPOISE (PHOCOENOIDES-DALLI) - GROWTH AND SEXUAL DIMORPHISM

被引：16

作者：

AMANO, M ^{[1
]}

MIYAZAKI, N ^{[1
]}

机构：

[1] NATL SCI MUSEUM,DEPT ZOOL,TOKYO,TOKYO 169,JAPAN

来源：

CANADIAN JOURNAL OF ZOOLOGY-REVUE CANADIENNE DE ZOOLOGIE | 1993年 / 71卷 / 06期

关键词：

D O I：

10.1139/z93-153

中图分类号：

Q95 [动物学];

学科分类号：

071002 ;

摘要：

We studied development and sexual dimorphism in external measurements of Dall's porpoises (Phocoenoides dalli) from the northwestern North Pacific. Relative rates of increase in the measurements of the head and flipper decrease postnatally, while those of the flukes, dorsal fin, and girths in the posterior part of the body do not. Growth patterns of the flukes and increase in girth at the anus are different from those in other small odontocetes. This is considered to be related to the fast swimming and presumed deep diving behavior of Dall's porpoise. Growth rates of appendages decrease with time after birth, as in other cetaceans. Secondary sexual features of males appear in the dorsal fin, flukes, and girth at the anus; the flukes show more distinct sexual dimorphism than the dorsal fin.

引用

页码：1124 / 1130

页数：7

共 33 条

[1] GEOGRAPHIC-VARIATION AND SEXUAL DIMORPHISM IN THE SKULL OF DALL PORPOISE, PHOCOENOIDES-DALLI [J].