Effect of temperature on zooplankton vertical migration velocity

Zooplankton diel vertical migration (DVM) is an ecologically important process, affecting nutrient transport and trophic interactions. Available measurements of zooplankton displacement velocity during the DVM in the field are rare; therefore, it is not known which factors are key in driving this ve...

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Published in:Hydrobiologia 2019-02, Vol.829 (1), p.143-166
Main Authors: Simoncelli, Stefano, Thackeray, Stephen J., Wain, Danielle J.
Format: Article
Language:English
Subjects:
Backscattering
Biomedical and Life Sciences
Chlorophyll
Chlorophyll a
Daphnia
Doppler sonar
Ecological function
Ecological monitoring
Ecology
Ecosystems
Food
Food webs
Foods
Freshwater & Marine Ecology
Freshwater crustaceans
Interactions
Lakes
Life Sciences
Light intensity
Luminous intensity
Mineral nutrients
Nutrient transport
Plankton
Primary Research Paper
Summer
Sunrise
Sunset
Swimming
Temperature effects
Trophic relationships
Velocity
Vertical migration
Water temperature
Zoology
Zooplankton
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description Zooplankton diel vertical migration (DVM) is an ecologically important process, affecting nutrient transport and trophic interactions. Available measurements of zooplankton displacement velocity during the DVM in the field are rare; therefore, it is not known which factors are key in driving this velocity. We measured the velocity of the migrating layer at sunset (upward bulk velocity) and sunrise (downwards velocity) in summer 2015 and 2016 in a lake using the backscatter strength (VBS) from an acoustic Doppler current profiler. We collected time series of temperature, relative change in light intensity chlorophyll- a concentration and zooplankton concentration. Our data show that upward velocities increased during the summer and were not enhanced by food, light intensity or by VBS, which is a proxy for zooplankton concentration and size. Upward velocities were strongly correlated with the water temperature in the migrating layer, suggesting that temperature could be a key factor controlling swimming activity. Downward velocities were constant, likely because Daphnia passively sink at sunrise, as suggested by our model of Daphnia sinking rate. Zooplankton migrations mediate trophic interactions and web food structure in pelagic ecosystems. An understanding of the potential environmental determinants of this behaviour is therefore essential to our knowledge of ecosystem functioning.
doi_str_mv 10.1007/s10750-018-3827-1
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1573-5117
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source Springer Nature
subjects Backscattering
Biomedical and Life Sciences
Chlorophyll
Chlorophyll a
Daphnia
Doppler sonar
Ecological function
Ecological monitoring
Ecology
Ecosystems
Food
Food webs
Foods
Freshwater & Marine Ecology
Freshwater crustaceans
Interactions
Lakes
Life Sciences
Light intensity
Luminous intensity
Mineral nutrients
Nutrient transport
Plankton
Primary Research Paper
Summer
Sunrise
Sunset
Swimming
Temperature effects
Trophic relationships
Velocity
Vertical migration
Water temperature
Zoology
Zooplankton
title Effect of temperature on zooplankton vertical migration velocity
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