Global Warming Impacts Micro-Phytoplankton at a Long-Term Pacific Ocean Coastal Station

摘要: Understanding impacts of global warming on phytoplankton – the foundation marine ecosystems is critical to predicting changes in future biodiversity, ocean productivity, and ultimately fisheries production. Using community abundance environmental data that span ~90 years (1931-2019) from a long-term Pacific Ocean coastal station off Sydney, Australia, we examined response using Community Temperature Index, an index preferred temperature community. With ~1.8℃ at site since 1931, found significant increase 1931-1932 2009-2019, suggesting relative proportion warm-water cold-water species has increased. The Index also showed clear seasonal cycle, with highest values end austral summer (Feb/Mar) lowest winter (Aug/Sept), pattern well supported by other studies this location. shift CTI was consequence decline cool-affinity (optimal = 18.7℃), chain-forming diatom Asterionellopsis glacialis (40% 13% 2009 onwards), substantial warm-affinity (21.5℃), Leptocylindrus danicus (20% 57% onwards). L. reproduces rapidly, forms resting spores under nutrient depletion, displays wide thermal range. Species such as may provide glimpse functional traits necessary be ‘winner’ climate change.