GripNews➤ 北大西洋浮游生物羣落變遷：氣候變遷影響下的複雜生態動力
✤ https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0323675
本研究分析了自1960年至2017年間北大西洋浮游生物記錄儀（CPR）的數據，重建了矽藻和雙鞭藻羣落生物量的變化。研究發現，除了東部和西部海域外，北大西洋的矽藻和雙鞭藻生物量每年下降了高達2%。同時，除了北極地區外，矽藻生物量相對於總矽藻和雙鞭藻生物量在整個北大西洋每年增加1-2%。這些結果證實了水溫升高時矽藻被雙鞭藻取代的普遍觀點，但未支持長期海洋暖化會導致大規模矽藻轉變為雙鞭藻的假設。
+ 這研究很有意思，以前一直以為暖化會直接導致矽藻減少，結果卻發現情況比較複雜，需要更深入瞭解浮游生物之間的互動。
+ 浮游生物是海洋生態系統的基礎，這研究的發現對於預測氣候變遷對海洋生態的影響至關重要。
#海洋生物學 #氣候變遷 #浮游生物
Large, regionally variable shifts in diatom and dinoflagellate biomass in the North Atlantic over six decades
The North Atlantic Ocean has large seasonal blooms rich in diatoms and dinoflagellates which can contribute disproportionately relative to other primary producers to export production and transfer of resources up the food web. Here we analyze data from the Continuous Plankton Recorder to reconstruct variation in the surface ocean diatom and dinoflagellate community biomass over 6 decades across the North Atlantic. We find: 1) diatom and dinoflagellate biomass has decreased up to 2% per year throughout the North Atlantic except in the eastern and western shelf regions, and 2) there has been a 1–2% per year increase in diatom biomass relative to total diatom and dinoflagellate biomass throughout the North Atlantic, except the Arctic province, from 1960–2017. Our results confirm the widely reported relationship where diatoms are displaced by dinoflagellates as waters warm on monthly to annual time scales. The common assumption that gradual ocean warming will result in a decadal-scale shift from diatoms to dinoflagellates was not supported by our analysis. Predicting the effects of climate change likely requires consideration of the consequences for the whole community, the simultaneous change of multiple environmental variables, and the evolutionary potential of plankton populations.
