Fig. 1
From: Seasonal habitat use and diel vertical migration in female spurdog in Nordic waters
Depth-temperature niche for 19 female spurdogs. Red colours denote the density of hourly data points (n = 110, 360) within a given grid cell weighted by the reciprocal of data points per Julian day. Black dotted and solid lines indicate the niche space that encompasses 50% and 95% of the points, respectively. Marginal densities are shown for both covariates on the upper and righthand side. For visualisation purposes, the y-axis was limited to 400 m depth