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预测气候变化不同情景下温带小型洄游鱼类栖息地适宜性的变化。

Forecasting shifts in habitat suitability across the distribution range of a temperate small pelagic fish under different scenarios of climate change.

机构信息

ISPA - University Institute, Department of Biosciences, Rua jardim do tabaco, 34, 1149-041 Lisbon, Portugal; MARE - Marine and Environmental Sciences Centre, Rua da Matemática, 49, 3004-517 Coimbra, Portugal.

ISPA - University Institute, Department of Biosciences, Rua jardim do tabaco, 34, 1149-041 Lisbon, Portugal; MARE - Marine and Environmental Sciences Centre, Rua da Matemática, 49, 3004-517 Coimbra, Portugal.

出版信息

Sci Total Environ. 2022 Jan 15;804:150167. doi: 10.1016/j.scitotenv.2021.150167. Epub 2021 Sep 8.

Abstract

Climate change often leads to shifts in the distribution of small pelagic fish, likely by changing the match-mismatch dynamics between these sensitive species within their environmental optima. Using present-day habitat suitability, we projected how different scenarios of climate change (IPCC Representative Concentration Pathways 2.6, 4.5 and 8.5) may alter the large scale distribution of European sardine Sardina pilchardus (a model species) by 2050 and 2100. We evaluated the variability of species-specific environmental optima allowing a comparison between present-day and future scenarios. Regardless of the scenario, sea surface temperature and salinity and the interaction between current velocity and distance to the nearest coast were the main descriptors responsible for the main effects on sardine's distribution. Present-day and future potential "hotspots" for sardine were neritic zones (<250 km) with water currents <0.4 m s, where SST was between 10 and 22 °C and SSS > 20 (PSU), on average. Most variability in projected shifts among climatic scenarios was in habitats with moderate to low suitability. By the end of this century, habitat suitability was projected to increase in the Canary Islands, Iberian Peninsula, central North Sea, northern Mediterranean, and eastern Black Sea and to decrease in the Atlantic African coast, southwest Mediterranean, English Channel, northern North Sea and Western U.K. A gradual poleward-eastward shift in sardine distribution was also projected among scenarios. This shift was most pronounced in 2100 under RCP 8.5. In that scenario, sardines had a 9.6% range expansion which included waters along the entire coast of Norway up and into the White Sea. As habitat suitability is mediated by the synergic effects of climate variability and change on species fitness, it is critical to apply models with robust underlying species-habitat data that integrate knowledge on the full range of processes shaping species productivity and distribution.

摘要

气候变化常常导致小型洄游鱼类的分布发生变化,可能是通过改变这些敏感物种在其环境最适点内的匹配不匹配动态。我们利用当前的栖息地适宜性,预测了不同的气候变化情景(IPCC 代表性浓度路径 2.6、4.5 和 8.5)在 2050 年和 2100 年可能如何改变欧洲沙丁鱼 Sardina pilchardus(模式物种)的大尺度分布。我们评估了物种特定环境最优值的可变性,以比较当前和未来的情景。无论情景如何,海表温度和盐度以及当前速度与离最近海岸的距离之间的相互作用是影响沙丁鱼分布的主要因素。当前和未来沙丁鱼的潜在“热点”是近岸海域(<250 公里),水流<0.4 米/秒,海表温度在 10 到 22°C 之间,盐度>20(PSU)。在预测的气候变化情景中,栖息地适宜性的变化最大的是中度到低适宜性的栖息地。到本世纪末,预计加那利群岛、伊比利亚半岛、北海中部、北地中海和黑海东部的栖息地适宜性将增加,而大西洋非洲海岸、西南地中海、英吉利海峡、北海北部和英国西部的栖息地适宜性将减少。在预测的情景中,沙丁鱼的分布也预计会逐渐向极地向东转移。在 RCP 8.5 情景下,这种转移最为明显。在该情景下,沙丁鱼的分布范围扩大了 9.6%,包括挪威沿海水域以及白海。由于物种适宜性受到气候变率和变化对物种适应性的协同影响,因此应用具有稳健基础物种-栖息地数据的模型来整合塑造物种生产力和分布的全过程知识至关重要。

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