명태(Theragra chalcogramma) 이석 내 산소동위원소 조성과 서식 수온 특성
Relationship between Oxygen Isotopic Composition of Walleye Pollock (Theragra chalcogramma) Otoliths and Seawater Temperature
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Oxygen isotopic composition (d18O) of walleye pollock, Theragra chalcogramma, otoliths were measured to investigate interannual and regional correlation with habitat temperature. Specimens were collected from fishermen in Korea and Japan between 1997~1999, while seawater temperatures were obtained from Korean and Japanese Oceanographic Data Centers. Seawater temperature was generally lower off the eastern Korean Peninsula than off eastern Hokkaido (Japan). Sagittal otoliths were removed for measurement of d18O using a micro-drilling technique. In most cases, d18O and habitat temperature exhibited negative relationship in Korean and Japanese waters. Higher d18O was observed in Korean pollock compared to Japanese pollock. The marginal parts of otoliths exhibited higher d18O than cores from both regions. This is an indication that somatic growth of walleye pollock occurs in deeper and cooler waters. Interannual variation in d18O was also observed. Mean d18O values acquired from 1997 otoliths were lower (2.15‰) than those of 1998 (2.67‰) and 1999 (2.65‰) in Korean pollock. These measurements coincided with changes in observed temperature in Korean waters, in which mean seawater temperature was warmer in 1997 than in 1998 and 1999. In Japanese waters, mean seawater temperature was lowest in 1997, which coincided with highest d18O values in the same year.
Abstract
Oxygen isotopic composition (d18O) of walleye pollock, Theragra chalcogramma, otoliths were measured to investigate interannual and regional correlation with habitat temperature. Specimens were collected from fishermen in Korea and Japan between 1997~1999, while seawater temperatures were obtained from Korean and Japanese Oceanographic Data Centers. Seawater temperature was generally lower off the eastern Korean Peninsula than off eastern Hokkaido (Japan). Sagittal otoliths were removed for measurement of d18O using a micro-drilling technique. In most cases, d18O and habitat temperature exhibited negative relationship in Korean and Japanese waters. Higher d18O was observed in Korean pollock compared to Japanese pollock. The marginal parts of otoliths exhibited higher d18O than cores from both regions. This is an indication that somatic growth of walleye pollock occurs in deeper and cooler waters. Interannual variation in d18O was also observed. Mean d18O values acquired from 1997 otoliths were lower (2.15‰) than those of 1998 (2.67‰) and 1999 (2.65‰) in Korean pollock. These measurements coincided with changes in observed temperature in Korean waters, in which mean seawater temperature was warmer in 1997 than in 1998 and 1999. In Japanese waters, mean seawater temperature was lowest in 1997, which coincided with highest d18O values in the same year.
참고문헌 (26)
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