Open Access

Table I

Environmental variables describing each fish position.

Variables environnementales associées à chacune des positions de poissons.

Identifier Type Description
PHOTOPERIOD (PP) Category Four phases of the day: ‘Dawn’ and ‘Dusk’ covering for two hours the sunrise and sunset* and ‘Day’ and ‘Night’, corresponding to hours recorded between Dawn and Dusk.
TEMP_S (MT) Numerical Mean daily water temperature, 50 cm below the surface (°C) in downstream part of the reservoir
WATER_LEVEL _DAY (WL) Numerical Mean daily water level of the reservoir (m NGF) calculated on hourly data
ABS_AMP_DAY (WLDif_D) Numerical Absolute value of the difference between the mean water level of day J and day J-1 (m)
DIRECTION_DAY (WLFD_D) Category Direction of WLF since the previous day. This is a two-mode variable: fall and rise
ACCUM_ABS_AMP_WEEK (WLDif_W) Numerical Sum of the ABS_AMP_DAY over the last 7 days (m)
DIRECTION_WEEK (WLFD_W) Category Direction of WLF since the last 7 days. This is a two-mode variable: fall and rise

Times of sunrise and sunset observed at Brive-la-Gaillarde.

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