|
KMID : 1161520130170050374
|
|
Animal Cells and Systems
2013 Volume.17 No. 5 p.374 ~ p.382
|
|
|
Ecological relationship between environmental factors and Pacific cod (Gadus macrocephalus) catch in the southern East/Japan Sea
|
|
Chung Sang-Deok
Kim Su-Am
Kang Su-Kyung
|
|
|
Abstract
|
|
|
|
The habitat characteristics of Pacific cod (Gadus macrocephalus) and the ecological relationship between Pacific cod catch and environmental parameters in the southern East/Japan Sea were investigated. Pacific cod is sexually matured at age of 4?5. The highest catch of Pacific cod off the eastern Korean Peninsula occurred in seawater temperature range of 0?4°C and salinity range of 33.8?34.2 practical salinity unit at 100 m. The Cross-Correlation Function analysis showed that there was a significant negative correlation between Pacific cod catch and February seawater temperature at 75 m nearby spawning area with a time lag of 5 years in Korean waters (r = ?0.360, p < 0.05). The annual catch of Pacific cod also had a significant correlation (p < 0.05) with zooplankton biomass in coastal nursery areas with a time lag, i.e., the highest ones, r = 0.432 and r = 0.452, for total zooplankton biomass in June of 5 years ago, and for euphausiids abundance in February of 4 years ago from the period when Pacific cod was caught, respectively. Furthermore, total catches of Pacific cod in the southern East/Japan Sea (i.e., sum of Korean and Japanese catches) were negatively correlated with winter Arctic Oscillation Index, and the highest negative correlation (r = ?0.364, p < 0.05) was shown with a time lag of 4 years. Considering sexual maturation at ages 4?5, such statistical analyses imply that biotic and abiotic environmental factors during the early life stages of Pacific cod have a significant influence on recruitment after 4?5 years of spawning.
|
|
|
KEYWORD
|
|
|
Pacific cod, recruitment, East/Japan Sea, climate change effects, Arctic Oscillation Index
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
 
|
|