Faculty of Biosciences and Aquaculture, Nord University, Bodø, Norway.
The Norwegian College of Fishery Science, University of Tromsø, Tromsø, Norway.
PeerJ. 2023 Aug 31;11:e15801. doi: 10.7717/peerj.15801. eCollection 2023.
Climate warming generally induces poleward range expansions and equatorward range contractions of species' environmental niches on a global scale. Here, we examined the direction and magnitude of species biomass centroid geographic shifts in relation to temperature and depth for 83 fish species in 9,522 standardised research trawls from the North Sea (1998-2020) to the Norwegian (2000-2020) and Barents Sea (2004-2020). We detected an overall significant northward shift of the marine fish community biomass in the North Sea, and individual species northward shifts in the Barents and North Seas, in 20% and 25% of the species' biomass centroids in each respective region. We did not detect overall community shifts in the Norwegian Sea, where two species (8%) shifted in each direction (northwards and southwards). Among 9 biological traits, species biogeographic assignation, preferred temperature, age at maturity and maximum depth were significant explanatory variables for species latitudinal shifts in some of the study areas, and Arctic species shifted significantly faster than boreal species in the Barents Sea. Overall, our results suggest a strong influence of other factors, such as biological interactions, in determining several species' recent geographic shifts.
气候变暖通常会导致物种的环境生态位在全球范围内向极地扩张和向赤道收缩。在这里，我们研究了 83 种鱼类物种的生物量质心地理转移的方向和幅度与温度和深度的关系，这些物种的数据来自北海（1998-2020 年）、挪威海（2000-2020 年）和巴伦支海（2004-2020 年）的 9522 次标准化研究拖网调查。我们发现，在北海，海洋鱼类群落的生物量总体上有向北的显著转移，在巴伦支海和北海，20%和 25%的物种生物量质心在每个区域都出现了个别物种向北的转移。在挪威海，我们没有检测到整个海洋群落的转移，在那里，两个物种（8%）分别向两个方向（向北和向南）转移。在 9 个生物特征中，物种的生物地理分配、适宜温度、成熟年龄和最大深度是一些研究区域物种纬度转移的重要解释变量，并且在巴伦支海，北极物种的转移速度明显快于北方物种。总的来说，我们的研究结果表明，其他因素（如生物相互作用）对确定几个物种最近的地理转移有很大的影响。
