Impact of tidal dynamics on diel vertical migration of zooplankton in Hudson Bay
作者： Vladislav Y. Petrusevich , Igor A. Dmitrenko , Andrea Niemi , Sergey A. Kirillov , Christina Michelle Kamula
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摘要: Abstract. Hudson Bay is a large seasonally ice-covered Canadian inland sea connected to the Arctic Ocean and North Atlantic through Foxe Basin and Hudson Strait. This study investigates zooplankton distribution, dynamics, and factors controlling them during open-water ice cover periods (from September 2016 October 2017) in Bay. A mooring equipped with two acoustic Doppler current profilers (ADCPs) sediment trap was deployed in September 2016 ∼190 km northeast from the port of Churchill. The backscatter intensity vertical velocity time series showed pattern typical for diel migration (DVM). collected five taxa including two calanoid copepods (Calanus glacialis Pseudocalanus spp.), pelagic sea snail (Limacina helicina), gelatinous arrow worm (Parasagitta elegans), an amphipod (Themisto libellula). From acquired acoustic data we observed the interaction DVM multiple lunar light, tides, water dynamics. Solar illuminance major factor determining migration pattern, but unlike at some other polar subpolar regions, moonlight had little effect on DVM, while tidal dynamics are important. presented constitute first-ever observed DVM winter its interaction tidal dynamics.
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