온난화에 따른 오징어 유생 생태 특성 변화

Abstract

To predict the ecological characteristics of common squid (Todarodes pacificus), we simulated the present and future ocean circulations using an East Asia Regional Ocean model (Modular Ocean Model, MOM version 3) projected by the three different global climate models under IPCC SRES A1B scenario. Mean climate states for 1990-1999 and 2030-2039 from 20th and 21th Century Climate Change Model Simulation were used as surface conditions for simulations, and we examined changes in spawning ground, hatching condition, larval dispersion between 1990s and 2030s. To infer spawning ground, the temperatures range of 15-23°C at 50 m depth were used because the highest density of hatchling were found at 25-50 m depth. Also, spawning is considered to occur at the continental shelf and slope of 100-500 m depth. Since mixed layer depth (MLD) is regarded as one of important factor determining successful hatching of egg masses, we examined the variability of MLD, and discussed its impacts on hatching condition. Lastly, using the velocity field from each model simulation, variability of larval dispersion was examined under different climate conditions. We used individual-based model incorporated ontogenetic vertical movement in larval dispersion, and simulated individuals tracked from inferred spawning grounds for 60 days.different global climate models under IPCC SRES A1B scenario. Mean climate states for 1990-1999 and 2030-2039 from 20th and 21th Century Climate Change Model Simulation were used as surface conditions for simulations, and we examined changes in spawning ground, hatching condition, larval dispersion between 1990s and 2030s. To infer spawning ground, the temperatures range of 15-23°C at 50 m depth were used because the highest density of hatchling were found at 25-50 m depth. Also, spawning is considered to occur at the continental shelf and slope of 100-500 m depth. Since mixed layer depth (MLD) is regarded as one of important