Inflexibility of vertebral number in chum salmon <Emphasis Type="Italic">Oncorhynchus keta</Emphasis> |
| |
Authors: | Daisei Ando Kazutaka Shimoda Yoshihito Shinriki Hirokazu Urabe Tomoya Aoyama Masamichi Nakajima |
| |
Institution: | (1) Salmon and Freshwater Fisheries Research Institute, Hokkaido Research Organization, 3-373 Kitakashiwagi, Eniwa Hokkaido, 061-1433, Japan;(2) Laboratory of Marine Life Science and Genetics, Graduate School of Agriculture, Tohoku University, 1-1 Tsutsumidori-amamiya, Aobaku Sendai, 981-8555, Japan |
| |
Abstract: | Chum salmon Oncorhynchus keta eggs from the Chitose and Shiriuchi rivers in Hokkaido, northern Japan, were incubated under identical conditions with the
aim of comparing vertebral number (V
N) to that reported archived data from the 1950s. The comparison revealed that mean V
N of salmon from the Shiriuchi River has remained unchanged for 50 years and is higher than that from the Chitose River. The
V
N in the Chitose River salmon was found to be significantly higher than that recorded in the archival data. The variation in
the mean V
N of chum salmon fry collected during different seasons and years in the Chitose River falls within a range that has remained
constant, suggesting that the difference between the values obtained in our study and the archival data may be due to differences
in the timing of egg collection. These results indicate that the mean V
N of chum salmon has been stable for a long period. Incubation experiments under identical conditions are a useful tool for
examining changes in genetic structure and detecting the essential properties of populations. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|