PDF(Pubmed)
Abstract：
Plankton community respiration (CR) in aquatic ecosystems varies with environmental factors, which could be altered during tropical cyclones (TCs). A potential increase in CR resulting from the effects of TCs is generally understudied. Here, we examined the relationship between plankton CR and environmental factors, including during TC-affected periods, in a phosphate-limited freshwater ecosystem. We conducted an intensive in situ sampling in Fei-Tsui Reservoir (FTR) from January 2010 to December 2015 during TC periods and non-TC periods. Our results showed a consistent temporal pattern that plankton CR increased between March to October and declined between November to February. These changes in plankton CR, primarily supported by bacterial biomass, were positively influenced by euphotic depth-averaged temperature. The CR also significantly increased with euphotic depth-averaged NO2-concentrations and decreased with euphotic depth-averaged NO3-concentrations. These results indicated that these factors typically influenced CR dynamics in the FTR. During TC periods, plankton CR was increased further due to a higher and ideal euphotic depth-averaged temperature (23-27°C) and increased supply of limiting nutrient resources via stream runoff. Overall, this study showed that a TC positively influences plankton CR by creating favorable water conditions. Notably, with a higher frequency of intense TCs projected for the Western North Pacific in most climate change scenarios, the impact of TCs on CR may increase in the near future.
摘要：
水生生态系统中的浮游生物群落呼吸（CR）随环境因素而变化，在热带气旋（TC）期间可能会改变。通常对由TC的影响导致的CR的潜在增加进行了研究。这里,我们研究了浮游生物CR与环境因素之间的关系，包括在受TC影响的时期，在磷酸盐有限的淡水生态系统中。从2010年1月至2015年12月，在TC期和非TC期，我们在飞咀水库（FTR）进行了密集的原位采样。我们的结果显示了一致的时间模式，浮游生物CR在3月至10月之间增加，而在11月至2月之间下降。浮游生物CR的这些变化，主要由细菌生物量支持，受共渗深度平均温度的积极影响。CR也随共晶深度平均NO2浓度而显着增加，随共晶深度平均NO3浓度而降低。这些结果表明,这些因素通常影响FTR中的CR动力学。在TC期间，由于更高和理想的富营养深度平均温度（23-27°C）以及通过径流增加的限制养分资源的供应，浮游生物CR进一步增加。总的来说,这项研究表明，TC通过创造有利的水条件对浮游生物CR产生积极影响。值得注意的是,在大多数气候变化情景中，预计北太平洋西部的强TC频率更高，TC对CR的影响在不久的将来可能会增加。
