文献类型： 外文期刊

第一作者： Xu, Min

作者： Xu, Min;Zhang, Hui;Song, Xiaojing;Yang, Linlin;Tang, Baojun;Xu, Min;Zhang, Hui;Song, Xiaojing;Yang, Linlin;Tang, Baojun;Liu, Shuhao;Li, Zhiguo

作者机构：

关键词： cephalopod; climate change; warm; spawn; nursery; migration; fishery management; SSP1-2.6; SSP5-8.5; resource

期刊名称：ANIMALS （ 影响因子：2.7； 五年影响因子：3.2 ）

ISSN： 2076-2615

年卷期： 2024 年 14 卷 18 期

页码：

收录情况： SCI

摘要： The cephalopod Sepiella maindroni de Rochebrune (Hoyle, 1886) is an economically important species in China's seas, but after habitat loss and overfishing in the 1980s, Sepia kobiensis (Hoyle, 1885) gradually replaced its ecosystem roles and fisheries status. Therefore, it is vital to identify the seasonal-spatial distribution variations and characteristics of these two species in recent years. In this study, we found that S. maindroni larvae were present at 30.50 degrees N 123.50 degrees E in winter, and the majority of overwintering populations were distributed outside the closed fishing lines of the China seas. Seasonal variations of the recorded sea surface salinity and depth indicated that S. maindroni moved from offshore to coastal areas in spring, where they stayed from summer to autumn, and then they migrated to warmer offshore areas in winter. During the spring, we found that S. kobiensis tended to be distributed in offshore areas in the northern and in inshore areas in the southern survey areas. We found a greater number of larger individuals in the offshore southern East China Sea in spring and a large number of growing juveniles in summer. Climate change is having important effects on the migration routes and seasonal-spatial distribution patterns of aquatic animals, including the cephalopods Sepiella maindroni de Rochebrune (Hoyle, 1886) and Sepia kobiensis (Hoyle, 1885) in the East China Sea region. We conducted bottom trawling surveys from 2018 to 2019 in the East China Sea region to identify the seasonal-spatial distribution patterns, including the locations of spawning and nursery grounds of both species, and to determine how they are related to environmental variables. We used random forests and boosted regression trees to identify the distribution patterns of both species from spring to winter to estimate the annual mean situations. We also predicted the habitat distribution variations in 2050 and 2100 under the SSP1-2.6 and SSP5-8.5 climate change scenarios. From our survey data, we detected increasing biomass densities of S. maindroni from 29.50 degrees N to 28.50 degrees N, where the largest value of 213.92 gind(-1) occurred. In spring, juvenile groups were present in coastal areas and larger individuals were found in offshore areas. We identified potential spawning grounds at 29.50 degrees-33.00 degrees N 122.50 degrees-123.00 degrees E adjacent to the Zhejiang coastline, and larger individuals and higher biomass densities in south of the 29.50 degrees N line in summer. In autumn, the average individual weight increased in the 28.00 degrees N 122.00 degrees E -> 124.00 degrees E area. We located potential S. kobiensis spawning grounds at 27.00 degrees N 122.00 degrees-123.50 degrees E in spring. Growing overwintering juveniles migrated to the area of 29.50 degrees-30.50 degrees N 125.00 degrees-127.00 degrees E in winter. The sea surface temperature of the areas inhabited by both species showed obvious seasonal variation. The SSP1-2.6 and SSP5-8.5 scenarios indicated that the habitat of S. maindroni would shift to the south first and then to the north of the study area with the intensification of CO2 emissions, and it would first expand and then greatly decrease. However, the habitat area of S. kobiensis would increase. Our results will contribute to a better understanding of the life history traits of both species and the changes in their distribution patterns under different climate scenarios to ensure sustainable exploitation and fisheries management.

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