Fig. 5
From: Seasonal habitat use and diel vertical migration in female spurdog in Nordic waters
Seasonal differences in depth time series and number of fast starts. Exemplary data shown for sharks 2, 10, 15, and 19 for a week in January (winter, left) and June (early summer, right) based on 1-min interval median depths (left y-axis) and temperatures (as colour) as well as hourly counts of fast starts (dark grey bars, right y-axis). Grey polygons mark night defined by sunset and sunrise and nautical dusk and dawn (sun 12° below horizon, winter only) around the tagging location. Note free y-axes and the x-axis in B showing data for May and not June due to lack of data for later month