This data sets comes from Cucherousset et al. (2013).
Format
pike is an object of class dataframe composed of 58 observations of 10 variables.
- trophic_status_initial
Initial trophic status at release
- ID
ID used for each individual by Cucherousset et al. (2013)
- Time
Time of the stable isotope measurement: 1 (Release) or 2 (Departure)
- Time_L
Time of the stable isotope measurement as string, either 'Release' or 'Departure'
- Date
Date of release (common for all individuals) or recapture (variable dependind of the date of departure)
- Size_mm
Size (length) of juvenile pike, in mm
- d13C
delta 13C values
- d15N
delta 15N values
- Residence_time
Number of days between the release and the recapture
- Trophic_status_final
Trophic status at the end of the study
Details
Briefly, Cucherousset et al. (2013) released 192 individually tagged, hatchery-raised, juvenile pike (Esox lucius L.) with variable initial trophic position (fin delta 13C/delta 15N values). Based on delta values, individuals were classified into zooplanktivorous (delta 15N < 10 ‰) and piscivorous (delta 15N > 10 ‰) as cannibalism is commonly observed in this species. Individuals were released in a temporarily flooded grassland where pike eggs usually hatch of the Brière marsh (France) to identify the determinants of juvenile natal departure. The release site was connected through a unique point to an adjacent pond used as a nursery habitat. Fish were continuously recaptured when migrating from flooded grassland to adjacent pond. Recaptured individuals (n = 29) were anaesthetized, checked for tags, measured for fork length, fin-clipped to quantify changes in delta 13C and delta 15N values, and released.