Abstract
We evaluated the use of the stable oxygen isotope (δ18O) in the otolith as a proxy for the temperature history of Japanese sardine Sardinops melanostictus individuals. Japanese sardine juveniles were reared in three different water temperatures over the course of a month. Otolith δ18O (δotolith) was analyzed by extracting the portions formed during the rearing period using a micromill. δ18O of the rearing water (δwater) was also analyzed. A linear relationship between otolith δ18O and ambient water temperature was identified as follows: δotolith − δwater = −0.18 * T + 2.69 (r2 = 0.91, p < 0.01). This equation is different from that proposed for inorganic aragonite or other Sardinops spp., with resulting application to wild Japanese sardine captured in the Pacific Ocean showing that it estimates a more realistic in situ temperature. Our findings suggest that the Japanese sardine-specific isotopic fractionation equation should be used when interpreting otolith δ18O of the Japanese sardine, and the methods presented here could also be useful to understand the temperature history of other fish species.
| Original language | English |
|---|---|
| Pages (from-to) | 55-59 |
| Number of pages | 5 |
| Journal | Fisheries Research |
| Volume | 194 |
| DOIs | |
| Publication status | Published - Oct 1 2017 |
| Externally published | Yes |
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Keywords
- Fractionation equation
- Japanese sardine otolith
- Micro-scale analysis
- Stable oxygen isotope
- Temperature proxy
ASJC Scopus subject areas
- Aquatic Science
Cite this
Temperature dependence of δ18O in otolith of juvenile Japanese sardine : Laboratory rearing experiment with micro-scale analysis. / Sakamoto, Tatsuya; Komatsu, Kosei; Yoneda, Michio; Ishimura, Toyoho; Higuchi, Tomihiko; Shirai, Kotaro; Kamimura, Yasuhiro; Watanabe, Chikako; Kawabata, Atsushi.
In: Fisheries Research, Vol. 194, 01.10.2017, p. 55-59.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Temperature dependence of δ18O in otolith of juvenile Japanese sardine
T2 - Laboratory rearing experiment with micro-scale analysis
AU - Sakamoto, Tatsuya
AU - Komatsu, Kosei
AU - Yoneda, Michio
AU - Ishimura, Toyoho
AU - Higuchi, Tomihiko
AU - Shirai, Kotaro
AU - Kamimura, Yasuhiro
AU - Watanabe, Chikako
AU - Kawabata, Atsushi
PY - 2017/10/1
Y1 - 2017/10/1
N2 - We evaluated the use of the stable oxygen isotope (δ18O) in the otolith as a proxy for the temperature history of Japanese sardine Sardinops melanostictus individuals. Japanese sardine juveniles were reared in three different water temperatures over the course of a month. Otolith δ18O (δotolith) was analyzed by extracting the portions formed during the rearing period using a micromill. δ18O of the rearing water (δwater) was also analyzed. A linear relationship between otolith δ18O and ambient water temperature was identified as follows: δotolith − δwater = −0.18 * T + 2.69 (r2 = 0.91, p < 0.01). This equation is different from that proposed for inorganic aragonite or other Sardinops spp., with resulting application to wild Japanese sardine captured in the Pacific Ocean showing that it estimates a more realistic in situ temperature. Our findings suggest that the Japanese sardine-specific isotopic fractionation equation should be used when interpreting otolith δ18O of the Japanese sardine, and the methods presented here could also be useful to understand the temperature history of other fish species.
AB - We evaluated the use of the stable oxygen isotope (δ18O) in the otolith as a proxy for the temperature history of Japanese sardine Sardinops melanostictus individuals. Japanese sardine juveniles were reared in three different water temperatures over the course of a month. Otolith δ18O (δotolith) was analyzed by extracting the portions formed during the rearing period using a micromill. δ18O of the rearing water (δwater) was also analyzed. A linear relationship between otolith δ18O and ambient water temperature was identified as follows: δotolith − δwater = −0.18 * T + 2.69 (r2 = 0.91, p < 0.01). This equation is different from that proposed for inorganic aragonite or other Sardinops spp., with resulting application to wild Japanese sardine captured in the Pacific Ocean showing that it estimates a more realistic in situ temperature. Our findings suggest that the Japanese sardine-specific isotopic fractionation equation should be used when interpreting otolith δ18O of the Japanese sardine, and the methods presented here could also be useful to understand the temperature history of other fish species.
KW - Fractionation equation
KW - Japanese sardine otolith
KW - Micro-scale analysis
KW - Stable oxygen isotope
KW - Temperature proxy
UR - http://www.scopus.com/inward/record.url?scp=85019658568&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85019658568&partnerID=8YFLogxK
U2 - 10.1016/j.fishres.2017.05.004
DO - 10.1016/j.fishres.2017.05.004
M3 - Article
AN - SCOPUS:85019658568
VL - 194
SP - 55
EP - 59
JO - Fisheries Research
JF - Fisheries Research
SN - 0165-7836
ER -