Acoustic and fluorescence data from: A marine zooplankton community vertically structured by light across diel to interannual timescales ...

• Main Authors: Hobbs, Laura, Banas, Neil, Cohen, Jonathan, Cottier, Finlo, Berge, Jørgen, Varpe, Øystein
• Format: Dataset
• Language: English
• Published: Dryad 2021
• Subjects: Arctic; Svalbard; Climate change; Kongsfjord*; Kongsfjorden; Zooplankton
• Online Access: https://dx.doi.org/10.5061/dryad.zw3r22878; https://datadryad.org/stash/dataset/doi:10.5061/dryad.zw3r22878

The predation risk of many aquatic taxa is dominated by visually searching predators, commonly a function of ambient light. Several studies propose that changes in visual predation will become a major climate-change impact on polar marine ecosystems. The high Arctic experiences extreme seasonality in the light environment, from 24-h light to 24-h darkness, and therefore provides a natural laboratory for studying light and predation risk over diel to seasonal timescales. Here, we show that zooplankton (observed using acoustics) in an Arctic fjord position themselves vertically in relation to light. A single isolume (depth-varying line of constant light intensity, the value of which is set at the lower limit of photobehaviour reponses of Calanus spp. and krill.) forms a ceiling on zooplankton distribution. The vertical distribution is structured by light across timescales, from the deepening of zooplankton populations at midday as the sun rises in spring, to the depth to which zooplankton ascend to feed during ... : Data were collected from moorings installed at ~ (78°N 11°E) (Kongsfjorden, Svalbard). Full details of mooring deployments and processing can be found in Table S1 of the associated paper. ...