Page 77 - 《水产学报》2025年第12期

赵春德，等 水产学报, 2025, 49(12): 129306

Impact of marine heatwave on the spatiotemporal distribution of
Ommastrephes bartramii in the Northwestern Pacific Ocean

1
4
ZHAO Chunde , CHEN Xinjun 1,2,3 , LEI Lin 1,2,3 , WANG Xiaohui , WANG Jintao 1,2,3*
1. College of Marine Living Resource Sciences and Management, Shanghai Ocean University, Shanghai 201306, China;
2. Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Shanghai Ocean University,
Ministry of Education, Shanghai 201306, China;
3. National Engineering Research Center for Oceanic Fisheries, Shanghai Ocean University, Shanghai 201306, China;
4. China National Fisheries Group Zhoushan Overseas Fisheries Co., Ltd., Zhoushan 316000, China

Abstract: Ommastrephes bartramii, a short-lived cephalopod species, is highly sensitive to environmental variability. The
Northwestern Pacific Ocean serves as its primary habitat, where frequent marine heatwaves (MHWs) significantly impact popu-
lation dynamics. However, the mechanisms underlying these impacts remain poorly understood. The study aims to elucidate the
impact mechanisms of MHWs on the resource abundance and spatiotemporal distribution of O. bartramii in the Northwestern
Pacific Ocean. The study utilizes gridded fishery and environmental data spanning May to November from 1995 to 2020 across
O. bartramii fishing grounds in the Northwest Pacific Ocean. A seasonal dynamic threshold method was employed to identify
MHW events, quantify cumulative intensity, and distinguish between MHW and non-MHW periods. Following precise spati-
otemporal alignment of samples, variance inflation factor analysis was conducted to screen independent environmental vari-
ables. A boosted regression tree (BRT) model was developed to analyze the impact mechanisms of MHWs and environmental
factors on O. bartramii abundance and distribution, and to reveal core habitats and their spatiotemporal dynamics. The cumulat-
ive intensity exhibited significant intermonth variability, showing a strong positive correlation with O. bartramii resource
abundance (R = 0.858, P = 0.013). The BRT model revealed that cumulative intensity served as an ecological indicator of O.
bartramii resource abundance, accounting for 3.427% of the model's relative importance. Response curves demonstrated signi-
ficantly higher O. bartramii resource abundance under MHW conditions, with a slight increasing trend under higher cumulat-
ive intensity. Model results identified high-abundance regions within 42°-45°N, 150°-175°E, revealing significant spatiotem-
poral coupling between O. bartramii abundance and cumulative intensity from May to November. The occurrence of MHWs is
more conducive to the aggregation of O. bartramii, promoting the formation of high-abundance fishing grounds. Given the
scarcity of biological data, the analytical framework proposed in this study provides a generalizable approach for investigating
MHW-marine organism interactions. These findings offer scientific support for O. bartramii stock assessment and sustainable
fishery management strategies.
Key words: Ommastrephes bartramii; marine heatwaves; boosted regression tree; spatiotemporal distribution; the Northwest-
ern Pacific
Corresponding author: WANG Jintao. E-mail: jtwang@shou.edu.cn
Funding projects: National Key Research and Development Program of China (2023YFD2401303); National Natural Science
Foundation of China (NSFC42476086); Development of Squid Fishery Forecasting Service System (COFC-C-S-2024-003)

中国水产学会主办 sponsored by China Society of Fisheries https://www.china-fishery.cn
13