Effects of climate change on catch composition, diversity of catch and mean trophic level in the Northeast Atlantic Ocean
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摘要: 东北大西洋是世界上重要的捕捞海域,气候变化对该海域捕捞产生了重要的影响。本文基于联合国粮农组织所提供的1982−2016年东北大西洋渔获产量数据,对该海域渔获物组成、多样性、平均营养级及主成分变化特征进行时间序列上的分析,并结合东北大西洋海域气候、环境因子,应用广义可加模型探究渔获物组成与气候变化之间的关系。结果显示:渔获物多样性的变化总体上呈下降趋势,2002−2010年间处于较低水平;平均营养级在2002年之前呈平缓下降的趋势,2002年之后开始波动上升,相关性分析表明这两个指标与海域环境因子的变化较为相关。对渔获物组成进行主成分分析显示,第一主成份变化的方差解释率达到35.3%,且与海域气候、环境因素有较高的相关性,第一主成分变化能够较好地表征气候影响下渔获物组成变化的情况。广义可加模型分析结果显示,渔获物组成变化的影响因素按解释率由高到低分别为:海表温度、海平面高度、盐度、海冰和北大西洋涛动指数。该研究有助于认识气候变化对海洋渔业资源及其结构组成的影响。Abstract: Global climate change has a profound impact on the world fisheries. Recently, the composition of catch in Northeast Atlantic Ocean has changed significantly. Based on the catch data in the Northeast Atlantic Ocean from 1982 to 2016 provided by the United Nations Food and Agricuture Organization, the diversity of catch, mean trophic level and the variation of principal component were analyzed in time series. Finally, combined with climate and environmental factors (sea surface temperature, SST; sea surface salinity, SSS; sea surface height, SSH; Sea Ice Concentration, SIC; North Atlantic Oscillation, NAO; Arctic Oscillation, AO; Atlantic Multidecadal Oscillation, AMO) in the Northeast Atlantic Ocean, the relationship between catches composition and climate change was explored by generalized additive model (GAM). The results showed that the diversity generally presented a declining trend, it was at a relatively low level during 2002 to 2010. The mean trophic level decreased slowly before 2002, then began to rise sharply. The correlation analysis showed that the changes of these two indicators were related to the environmental factors. The principal component analysis of catch composition showed that the variance of the first principal component was 35.3%, and it also has a close relationship with climatic and environmental factors, which could characterize the change of catch structure under the influence of climate. The results of GAM analysis showed that the orders of the contribution to structure change of catches were in sequence of SST, SSH, SSS, SIC and NAO.
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Key words:
- Northeast Atlantic Ocean /
- climate change /
- catch composition /
- diversity of catch /
- mean trophic level
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表 1 渔获物组成第1和第2主成分载荷值
Table 1. Loadings on the first and second principal components from the analysis of catch composition
种类 拉丁学名 主成分载荷值 PC1 PC2 大西洋鲱 Clupea harengus −0.733 −0.223 大西洋鳕 Gadus morhua 0.236 0.811 毛鳞鱼 Mallotus villosus 0.671 −0.123 蓝鳕 Micromesistius poutassou −0.537 −0.422 大西洋鲭 Scomber scombrus −0.508 0.757 玉筋鱼属 Ammodytes spp 0.713 −0.192 绿青鳕 Pollachius virens 0.085 0.121 黍鲱 Sprattus sprattus −0.816 −0.370 黑线鳕 Melanogrammus aeglefinus −0.366 0.484 挪威长臀鳕 Trisopterus esmarkii 0.903 0.144 竹䇲鱼 Trachurus trachurus 0.315 −0.110 平鲉属 Sebastes spp 0.932 −0.034 沙丁鱼 Sardina pilchardus 0.812 −0.138 欧洲鲽 Pleuronectes platessa 0.764 0.521 牙鳕 Merlangius merlangus 0.913 0.181 欧洲无须鳕 Merluccius merluccius −0.173 0.943 竹䇲鱼属 Trachurus spp 0.173 −0.164 魣鳕 Molva molva 0.634 0.583 格陵兰大比目鱼 Reinhardtius hippoglossoides 0.316 0.624 欧洲鳀 Engraulis encrasicolus −0.225 0.242 长鳍金枪鱼 Thunnus alalunga 0.607 0.188 单鳍鳕 Brosme brosme 0.759 0.333 鳎 Solea solea 0.425 0.020 鳐科 Rajidae 0.703 −0.593 北极鳕 Boreogadus saida 0.086 −0.433 白斑角鲨 Squalus acanthias 0.976 0.066 鮟鱇属 Lophius spp 0.084 0.627 尖吻平鲉 Sebastes mentella −0.842 −0.066 金平鲉 Sebastes marinus −0.881 0.099 鮟鱇 Lophius piscatorius −0.698 0.063 大西洋狼鱼 Anarhichas lupus 0.054 −0.133 水珍鱼属 Argentina spp −0.749 0.102 圆鲭 Scomber colias −0.657 0.666 条长臀鳕 Trisopterus luscus 0.690 0.093 表 2 气候、环境因素第1和第2主成分载荷值
Table 2. Loadings on the first and second principal components from the analysis of the climatic and environmental factors
因素 主成分载荷值 PC Ⅰ PC Ⅱ 温度 0.935 0.284 盐度 0.610 0.632 海面高度 0.820 −0.086 海冰 −0.660 −0.437 北大西洋涛动指数 −0.580 0.744 大西洋年代际涛动指数 0.863 −0.183 北极涛动指数 −0.335 0.833 表 3 气候、环境因素主成分变化与各类渔获物组成指数相关性系数
Table 3. The correlation coefficients of climatic and environmental factors principal component scores and different kinds of catch composition indexes
多样性指数 平均营养级 PC1 PC2 PCI −0.609** 0.623** −0.783** 0.396 PCII 0.370 −0.225 0.382* 0.148 注:*表示p<0.05下相关性显著,**表示p<0.01下相关性极显著。 表 4 渔获物组成PC1与各气候、环境因素的GAM模型拟合
Table 4. GAM models fitted to the first principal component scores of catch composition (PC1) and climatic and environmental factors
模型因子 P值 F值 累计解释偏差/% 可解释偏差/% AIC值 +水温 2.12×10−2 6.05 74.8 74.8 59.53 +盐度 1.46×10−4 9.27 81.2 6.4 59.48 +海面高度 7.10×10−5 22.08 89.2 8.0 42.65 +海冰 1.73×10−4 19.15 92.3 3.1 24.20 +北大西洋涛动 3.82×10−1 1.14 94.3 2.0 16.84 +大西洋年代际涛动 6.83×10−1 0.17 94.4 0.1 18.82 +北极涛动 4.44×10−1 0.60 94.6 0.2 19.31 -
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