NDLI: Migratory histories of three types of Cottus pollux (small-egg, middle-egg, and large-egg types) as revealed by otolith microchemistry

Content Provider	Springer Nature Link
Author	Goto, Akira Arai, Takaomi
Copyright Year	2003
Abstract	Migratory histories of three types of Cottus pollux, the small-egg type (SE type), middle-egg type (ME type), and large-egg type (LE type), were studied by examining strontium (Sr) and calcium (Ca) in their otoliths with wavelength dispersive X-ray spectrometry on an electron microprobe. The Sr : Ca ratios in the otoliths changed both with ontogenetic development and with salinity of the habitat. Otolith Sr : Ca ratios of LE-type samples and the ME-type samples from the Honmyo River, Kyushu Island, showed consistently low ratios, averaging 1.8 × 10−3 and 2.4 × 10−3 from the core to the edge, respectively. In contrast, otolith Sr : Ca ratios of SE-type samples and the other four ME-type samples from Hokkaido and Honshu Islands fluctuated strongly along the life history transects in accordance with migration patterns from freshwater to the sea and vice versa. The otolith Sr : Ca ratios of SE-type samples showed low ratios from the core to a point around 15 μm, averaging 1.5 × 10−3, and subsequently increased sharply with a high Sr : Ca ratio phase to a point around 400 μm, averaging 5.5 × 10−3, and followed again a low ratio phase to the edge with averages of 3.1 × 10−3. Similar fluctuation patterns in otolith Sr : Ca ratios were found for the four ME-type samples. These findings clearly demonstrated that otolith Sr : Ca ratios reflected the sculpin's life histories, as being fluvial for the LE type and the Honmyo River ME type and amphidromous for the SE type and the other four populations of ME type.
Starting Page	67
Ending Page	72
Page Count	6
File Format	PDF
ISSN	13418998
Journal	Ichthyological Research
Volume Number	50
Issue Number	1
e-ISSN	16163915
Language	English
Publisher	Springer-Verlag Tokyo
Publisher Date	2003-02-01
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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