Decadal phytoplankton dynamics in response to episodic climatic disturbances in a subtropical deep freshwater ecosystem
Journal
Water Research
Journal Volume
109
Pages
102 - 113
Date Issued
2017
Author(s)
Abstract
Information of the decadal timescale effects of episodic climatic disturbances (i.e., typhoons) on phytoplankton in freshwater ecosystems have received less attention and fewer seasonal evaluations partly due to the lack of long-term time-series monitoring data in typhoon prevailing areas. Through field observations of a total 36 typhoon cases in a subtropical deep freshwater ecosystem in the period of 2005–2014, we quantified phytoplankton biomass, production and growth rate in response to meteorological and hydrological changes in the weeks before, during and after typhoons between summer and autumn, and also investigated the effects of typhoon characteristics on the aforementioned phytoplankton responses. The results showed that phytoplankton exposed to typhoon disturbances generally exhibited an increasing trend over the weeks before, during and after typhoons in summer but varied in autumn. The correlations and multivariate regressions showed different contributions of meteorological and hydrological variables to individual phytoplankton responses before, during and after typhoons between seasons. The post-typhoon weeks (i.e., within two weeks after a typhoon had passed) were especially important for the timeline of phytoplankton increases and with a detectable seasonal variation that the chlorophyll a concentration significantly increased in autumn whereas both primary production and growth rate were associated with significant changes in summer. Additionally, phytoplankton responses during the post-typhoon weeks were significantly different between discrete or continuous types of typhoon events. Our work illustrated the fact that typhoons did influence phytoplankton responses in the subtropical deep freshwater ecosystem and typhoon passages in summer and autumn affected the phytoplankton dynamics differently. Nevertheless, sustained and systematic monitoring in order to advance our understanding of the role of typhoons between seasons in the modulation of phytoplankton productivity and functioning is required because such episodic climatic disturbances are projected to have intense magnitude and inconsistent frequency under 21st century climate change. © 2016 Elsevier Ltd
Subjects
Chlorophyll-a; Climatic disturbance; Freshwater ecosystem; Growth rate; Phytoplankton; Primary production; Typhoon
Other Subjects
Chlorophyll; Climate change; Ecology; Ecosystems; Growth rate; Phytoplankton; Regression analysis; Storms; Tropics; Water; Chlorophyll a; Chlorophyll-a concentration; Climatic disturbance; Freshwater ecosystem; Multivariate regression; Phytoplankton productivity; Primary production; Typhoon characteristics; Hurricanes; chlorophyll a; fresh water; chlorophyll a; climate change; environmental disturbance; freshwater ecosystem; growth rate; phytoplankton; primary production; seasonal variation; subtropical region; typhoon; Article; autumn; biomass production; climate change; freshwater environment; growth rate; hurricane; hydrology; nonhuman; phytoplankton; priority journal; seasonal variation; summer; water sampling; water temperature; wind; biomass; ecosystem; Biomass; Climate Change; Ecosystem; Fresh Water; Phytoplankton
Type
journal article