School of Biological Sciences and the Centre for Marine Futures, University of Western Australia, Crawley, WA, Australia.
Australian Institute of Marine Science, Indian Ocean Marine Research Centre, University of Western Australia, Crawley, WA, Australia.
Glob Chang Biol. 2018 May;24(5):1894-1903. doi: 10.1111/gcb.14083. Epub 2018 Feb 26.
Entrainment of growth patterns of multiple species to single climatic drivers can lower ecosystem resilience and increase the risk of species extinction during stressful climatic events. However, predictions of the effects of climate change on the productivity and dynamics of marine fishes are hampered by a lack of historical data on growth patterns. We use otolith biochronologies to show that the strength of a boundary current, modulated by the El Niño-Southern Oscillation, accounted for almost half of the shared variance in annual growth patterns of five of six species of tropical and temperate marine fishes across 23° of latitude (3000 km) in Western Australia. Stronger flow during La Niña years drove increased growth of five species, whereas weaker flow during El Niño years reduced growth. Our work is the first to link the growth patterns of multiple fishes with a single oceanographic/climate phenomenon at large spatial scales and across multiple climate zones, habitat types, trophic levels and depth ranges. Extreme La Niña and El Niño events are predicted to occur more frequently in the future and these are likely to have implications for these vulnerable ecosystems, such as a limited capacity of the marine taxa to recover from stressful climatic events.
多种物种的生长模式被单一气候驱动因素所限制，可能会降低生态系统的弹性，并在气候胁迫事件中增加物种灭绝的风险。然而，由于缺乏有关生长模式的历史数据，气候变化对海洋鱼类生产力和动态的预测受到了阻碍。我们利用耳石生物chronologies 来表明，厄尔尼诺-南方涛动调节的边界流的强度解释了六种热带和温带海洋鱼类中五种鱼类的年度生长模式的近一半的共享方差，这些鱼类横跨西澳大利亚的 23°纬度（3000 公里）。拉尼娜年期间更强的水流导致了五种鱼类的生长增加，而厄尔尼诺年期间较弱的水流则减少了生长。我们的工作首次在大空间尺度和多个气候带、生境类型、营养层次和深度范围内，将多种鱼类的生长模式与单一海洋/气候现象联系起来。未来预计会更频繁地出现极端拉尼娜和厄尔尼诺事件，这可能对这些脆弱的生态系统产生影响，例如海洋生物类群从气候胁迫事件中恢复的能力有限。
