pike {ecotraj}R Documentation

pike dataset

Description

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.

Author(s)

Cucherousset, J., Paillisson, J.-M., Roussel, J.-M.

References

Cucherousset, J., Paillisson, J.-M., Roussel, J.-M., 2013. Natal departure timing from spatially varying environments is dependent of individual ontogenetic status. Naturwissenschaften 100, 761–768.


[Package ecotraj version 0.1.1 Index]