DOI: 10.5061/dryad.pk0p2ngv6
title: Atlantic cod individual spatial behaviour and stable isotope associations in a no-take marine reserve

description: Foraging is a behavioural process and, therefore, individual behaviour and
 diet are theorized to covary. However, few comparisons of individual
 behaviour type and diet exist in the wild. We tested whether behaviour
 type and diet covary in a protected population of Atlantic cod, Gadus
 morhua.  Working in a no-take marine reserve, we could collect
 data on natural behavioural variation and diet choice with minimal
 anthropogenic disturbance. We inferred behaviour using acoustic telemetry
 and diet from stable isotope compositions (expressed as δ13C and δ15N
 values). We further investigated whether behaviour and diet could have
 survival costs. We found cod with shorter diel vertical migration
 distances fed at higher trophic levels. Cod δ13C and δ15N values scaled
 positively with body size. Neither behaviour nor diet predicted survival,
 indicating phenotypic diversity is maintained without survival costs for
 cod in a protected ecosystem. The links between diet and diel vertical
 migration highlight that future work is needed to understand whether the
 shifts in this behaviour during environmental change (e.g. fishing or
 climate), could lead to trophic cascades. 
description: # Atlantic cod individual spatial behaviour and stable isotope
 associations in a no-take marine reserve
 [https://doi.org/10.5061/dryad.pk0p2ngv6](https://doi.org/10.5061/dryad.pk0p2ngv6) This dataset contains all data used in the analysis for the associated manuscript, as well as an R script which can be used to replicate the analysis. There are six files, including multispecies stable isotope data, cod sampling data, cod specific stable isotope data, cod meta data, cod positions and an R script for analysis. ## Description of the data and file structure file: cod\_stable\_isotopes.rdata description: Cod specific stable isotopes data in the .rdata format columns: ``` TRIP - sampling event Lcm - Fork length (in cm) of the cod measured during sampling d13C - δ13C values in ‰ d15N - δ15N values in ‰ X.C - %C X.N - %N C.N.Ratio - C:N ratio serial - transmitter ID of the cod (connected to positioning dataset) samplingDate - date of sampling x - UTM x (m) location of cod capture y - UTM y (m) location of cod capture month - month the sampling event took place year - year the sampling event took place quarter - quarter of the year the sampling event took place ``` file: TVE2011Effort.csv description: Sampling effort and locations in the Tvedestrand fjord columns: ``` Trip: The sampling event Pos: The specific sampling location, encoded numerically Lat: The latitude of the sampling site in decimal degrees Lon: The longitude of the sampling site in decimal degrees Gear: The sampling gear used ``` file: SI.rdata description: stable isotope samples collected throughout the Tvedestrand foodweb. columns: ``` Trip: The sampling event corresponding to the Effort.Rdata encoding Pos: The sampling location corresponding to the Effort.Rdata encoding Species: The binomial name of the sampled organism Lcm: The length of the sampled organism when measured MuBiop: Unique biopsy ID MB.Number: Secondary biopsy ID SIA.ID: Unique stable isotope sample ID SIA.Num: secondard stable isotope ID d13C: The delta 13C stable isotope value in ‰ d15N: The delta 15N stable isotope value in ‰ X.C: %C X.N: %N C.N.Ratio: C:N ratio Comment: Notes related to the sample ``` file: telem.rdata description: Data collected during each cod sampling event, including recaptures columns: ``` scientific_name - species sampled ReleaseDate - date sampled tag_expected_life_time_days - expected battery life of the acoustic transmitter in days MinDelaySec - minimum burst interval of the acoustic transmitter in seconds MaxDelaySec - maximum burst interval of the acoustic transmitter in seconds TagFamily - transmitter model Trip - sampling event Year tagged - year behavioural measurements began TripHaul - capture event within the sampling event Haul - unique capture event ID time - sampling time Lcm - fork length (cm) measured during the sampling event Wg - body weight (g) measured during the sampling event fate - determined fate of the individual D = dispersal F = fishing mortality P = predated NM = natural mortality S = survived through tracking period T = tagging mortality N = undedetermined fate_date - date of mortality, or end of tracking. sure_date - conservative evaluation with higher certainty of the date of mortality ``` file: Allcodpositions.rdata description: dataset "pos" contains a list of all cod positions used in the stable isotope anaylsis columns: ``` X - location in m Y - location in m D - depth under the surface (m), based on the pressure sensor in the transmitter LAT - latitude for the position LON - longitude for the position HPE - InnovaSea/VEMCO horizontal position error TEMP - water temperature in degrees Celcius as measured by the transmitter Depth - repeat of column D ID - unique identity for each cod time - date and time of the detection, in POSIXct format, time zone UTC day - day of detection in POSIXct format week - week of detection in POSIXct format hour - hour of detection in POSIXct format min - minute of detection in POSIXct format x - x coordinate of detection in UTM projection (m) y - y coordinate of detection in UTM projection (m) fate_date - the calendar date in which the assigned fate occurred. ``` ## Sharing/Access information All data is included in this dryad upload. ## Code/Software One script including the code used to perfom the analysis and create the figures is included.