The influence mechanism of sea surface temperature on the resource change of Sthenoteuthis oualaniensis in Nansha sea area, South China Sea

doi:10.3969/j.issn.1001-909X.2024.01.010

Abstract

Abstract:

The influence of sea surface temperature (SST) on the resource change of Sthenoteuthis oualaniensis in Nansha Sea area was studied based on the catch data and remote sensing data of SST in 2018 and 2019. Empirical orthogonal function (EOF) results showed that the seasonal variation of the SST was obvious and the monthly variability showed a bimodal pattern. Peaks mainly appeared in May-June and October. In 2019, El Niño occurred in the Nansha Sea area, and the high temperature frequency of SST increased, and the annual average temperature value increased by 0.3 ℃ compared with 2018. The catch per unit effort (CPUE) of S. oualaniensis was higher in spring (from March to May)but lower in summer (from June to July) in 2018, while it was higher in winter (February) and lower in summer (June) in 2019.The optimal generalized additive model (GAM) consisted of four factors: month, SST, latitude and longitude, and the total deviation of CPUE was interpreted as 55.0%, in which the deviation of month and SST was explained more than other factors. 27.5 ℃-29.5 ℃ was suitable for the distribution of S. oualaniensis and the CPUE would be reduced by higher temperatures. The fishing ground of S. oualaniensis was distributed in 10°N-12°N, 113°E-116°E, and the center of the fishing ground changed with temperature in each month, shifting eastward when warming up, and westward when cooling down.

Key words: Sthenoteuthis oualaniensis, sea surface temperature, EOF, GAM

CLC Number:

S931.41

WU Wenxiu, XU Xinwen, CHENG Shuxing, ZHAO Chunxu, GUO Youjun, SHEN Chunyan, YAN Yunrong. The influence mechanism of sea surface temperature on the resource change of Sthenoteuthis oualaniensis in Nansha sea area, South China Sea[J]. Journal of Marine Sciences, 2024, 42(1): 106-116.

Figures/Tables 10

Fig.1 Diagram of sampling site

Fig.2 The first EOF mode of SST in Nansha Sea area

Fig.3 Monthly average variation of SST in Nansha sea area

Fig.4 The frequency distribution of SST in Nansha sea area

Fig.5 Monthly variation of CPUE of S. oualaniensis in Nansha sea area

Fig.6 Monthly variation of fishing ground center of S. oualaniensis in Nansha sea area

Tab.1 Statistical parameters of different GAM models

模型	AIC	偏差解释度/%	决定系数R²
模型1	650.714	37.6	0.35
模型2	611.052	51.6	0.48
模型3	608.688	53.9	0.49
模型4	608.285	55.0	0.50

Fig.7 Effects of environmental variables on the CPUE of S.oualaniensis in Nansha sea area (The shadow part represents confidence interval, and the solid line represents the smooth fit of the explanatory variables to the CPUE of S. oualaniensis.)

Fig.8 Distribution of CPUE and SST of S. oualaniensis in Nansha sea area in 2018

Fig.9 Distribution of CPUE and SST of S. oualaniensis in Nansha sea area in 2019

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