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Open AccessFeature PaperArticle

Response of Zooplankton to Climate Variability: Droughts Create a Perfect Storm for Cladocerans in Shallow Eutrophic Lakes

1
National Demonstration Center for Experimental Fisheries Science Education, CREEFN of the Ministry Agriculture and Shanghai Universities Key Laboratory of Marine Animal Taxonomy and Evolution, Shanghai Ocean University, Shanghai, 201306, China
2
Florida Sea Grant College Program and University of Florida Institute of Food and Agricultural Sciences, Gainesville, FL 32611, USA
3
BSA Environmental Services, Beachwood, OH 44122, USA
4
St. Johns River Water Management District, Palatka, FL 32177, USA
*
Author to whom correspondence should be addressed.
Water 2017, 9(10), 764; https://doi.org/10.3390/w9100764
Received: 3 August 2017 / Revised: 25 August 2017 / Accepted: 4 October 2017 / Published: 6 October 2017
(This article belongs to the Special Issue Ecological Responses of Lakes to Climate Change)
A major attribute of the Earth’s climate that may be affected by global warming is the amplitude of variability in teleconnections. These global-scale processes involve links between oceanic conditions in one locale and weather in another, often distant, locale. An example is the El Niño Southern Oscillation (ENSO), which can affect rainfall and then the properties of lakes in Europe, Africa, North and South America. It affects rainfall, droughts and the depth of lakes in Florida, USA. It is predicted that the amplitude of variation in the ENSO will increase with global warming and, therefore, droughts will become more severe and periods of rain more intense. We investigated possible effects of climate on the zooplankton in shallow subtropical lakes by studying 16 years of monthly data from six shallow eutrophic lakes located north of Orlando, Florida. Results indicate that water depth and lake volume are tightly coupled with rainfall, as expected. During droughts, when lake depth and volume were greatly reduced, there were intensified cyanobacterial blooms, and the zooplankton shifted towards greater relative biomass of copepods compared to cladocerans. The change of zooplankton was likely due to the intensified selective fish predation in the reduced water volume, and/or selective adverse effects of cyanobacteria on cladocerans. The greatly reduced volume might lead to a ‘perfect storm’ of top-down and bottom-up factors that favor copepods over cladocerans. The mechanism needs further study. Regardless, this study documents a direct link between climate variability and zooplankton composition, and suggests how future changes in climate might affect plankton communities. View Full-Text
Keywords: climate variability; rainfall; shallow lakes; zooplankton; cladocerans; copepods; cyanobacteria climate variability; rainfall; shallow lakes; zooplankton; cladocerans; copepods; cyanobacteria
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Ji, G.; Havens, K.E.; Beaver, J.R.; Fulton, R.S., III. Response of Zooplankton to Climate Variability: Droughts Create a Perfect Storm for Cladocerans in Shallow Eutrophic Lakes. Water 2017, 9, 764.

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