Ocean Warming Effects on Catch and Revenue Composition in the Northwestern Mediterranean Sea

IF 10.8 1区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION
Lucía Espasandín, Francisco Ramírez, Miquel Ortega, Ernesto Villarino, Guillem Chust, Valerio Sbragaglia, Marta Coll
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引用次数: 0

Abstract

Climate change-induced ocean warming can have profound implications for marine ecosystems and the socioeconomic activities dependent on them, affecting the catch composition, and fisheries revenue. Our study evaluates spatio-temporal changes in the Northwestern Mediterranean marine fisheries catch and revenue composition tied to ocean warming and disentangles the different underlying processes. To do so, we analyzed the weighted mean thermal affinity of the catch (Mean Temperature of the Catch: MTC) and revenue (Mean Temperature of Revenue: MTR) across different taxonomic groups, fishing fleets, and fishing harbors, using a 23-year time series of commercial landings. Results revealed changes in catch and revenue composition, with an overall temporal increase in the MTC (0.68°C per decade) and MTR (0.58°C per decade) linked to local sea temperature. The temporal increase in both indices prevailed across fishing fleets and taxonomic groups. The processes underpinning these changes over time were tropicalization (i.e. relative increase of warm-affinity species; 41.97% for MTC and 45.20% for MTR), and deborealization (i.e. relative decrease of cold-affinity species; 46.58% for MTC and 44.99% for MTR), with variability across dimensions. Deborealization particularly influenced pelagic fisheries (i.e. purse-seiners and surface longliners) and some commercially important species (e.g. European hake, blue whiting, and Norway lobster). Even if the temporal increase in MTC and MTR was consistent across taxonomic groups and fleets, the spatial dimension showed heterogeneity and temporal declines in some cases. In summary, our study provides valuable information about temporal changes in catch composition associated with local ocean warming and reveals potential cascading effects through the social-ecological system. In particular, we presented the MTR approach for the first time, evidencing ocean warming effects on revenue composition. We suggest that the correlation between changes in catch and revenue composition reveals the adaptive capacity, or fragility of specific fishing fleets and points to management priorities.

Abstract Image

Abstract Image

海洋变暖对地中海西北部渔获和收入构成的影响
气候变化引起的海洋变暖可能对海洋生态系统和依赖于它们的社会经济活动产生深远影响,影响捕捞构成和渔业收入。我们的研究评估了地中海西北部海洋渔业捕捞和收入构成与海洋变暖相关的时空变化,并解开了不同的潜在过程。为此,我们利用23年的商业着陆时间序列,分析了不同分类类群、渔船队和渔港的渔获量(平均渔获温度:MTC)和收入(平均渔获温度:MTR)的加权平均热亲和力。结果揭示了渔获量和收入构成的变化,与当地海温相关的MTC(0.68°C / 10年)和MTR(0.58°C / 10年)的总体时间增加。这两项指数的时间增长在不同的捕捞船队和分类类群中普遍存在。随着时间的推移,支撑这些变化的过程是热带化(即暖亲和物种的相对增加;MTC为41.97%,MTR为45.20%),去borealization(即冷亲和物种相对减少;MTC为46.58%,MTR为44.99%),各维度存在差异。去bolorealization特别影响了远洋渔业(即围网渔场和水面延绳钓)和一些商业上重要的物种(例如欧洲鳕鱼、蓝鳕和挪威龙虾)。尽管不同类群和种群间MTC和MTR在时间上的增加是一致的,但在空间维度上却表现出异质性和时间上的下降。总之,我们的研究提供了与局部海洋变暖相关的捕捞组成的时间变化的有价值的信息,并揭示了通过社会生态系统潜在的级联效应。特别是,我们首次提出了MTR方法,证明了海洋变暖对收入构成的影响。我们认为,渔获量变化与收入构成之间的相关性揭示了特定捕捞船队的适应能力或脆弱性,并指出了管理重点。
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来源期刊
Global Change Biology
Global Change Biology 环境科学-环境科学
CiteScore
21.50
自引率
5.20%
发文量
497
审稿时长
3.3 months
期刊介绍: Global Change Biology is an environmental change journal committed to shaping the future and addressing the world's most pressing challenges, including sustainability, climate change, environmental protection, food and water safety, and global health. Dedicated to fostering a profound understanding of the impacts of global change on biological systems and offering innovative solutions, the journal publishes a diverse range of content, including primary research articles, technical advances, research reviews, reports, opinions, perspectives, commentaries, and letters. Starting with the 2024 volume, Global Change Biology will transition to an online-only format, enhancing accessibility and contributing to the evolution of scholarly communication.
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