Variation in movements before and after departure from natal territories in a family living bird
Data files
Feb 27, 2025 version files 89.24 KB
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Antshrike_Movement_data.xlsx
83.73 KB
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README.md
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Abstract
This dataset contains movement metrics generated from radio tracking of Thamnophilus atrinucha (Black-crowned antshrikes, hereafter antshrike) at the Limbo plot (9° 9' 35" N, 79° 44' 36" W), located within Parque Nacional Soberanía in Central Panama. Fledgling antshrikes were fitted with transmitters prior to natal dispersal. We monitored movements using radio telemetry during two different stages, pre-departure from the natal territory (the pre-departure stage) and after departure from the natal territory (the floating stage). In the data we also include intrinsic (sex, days since departure, age at departure, offspring age) and extrinsic (fledge date, rainfall) factors associated with the movement behaviors. Rainfall metrics were generated using data provided by the Physical Monitoring Program of the Smithsonian Tropical Research Institute weather station located on Barro Colorado Island (Paton 2019, Smithsonian Tropical Research Institute).
https://doi.org/10.5061/dryad.sqv9s4ndm
Description of the data and file structure
File: Antshrike_Movement_data.xlsx
Description: Each tab is the data (movement variable and covariates) associated with one of the seven movement metrics: four pre-departure stage and three floating stage movement metrics.
Pre-departure stage
Tab name: PreDeparture_ProspectingRange - For each individual, the total area explored by the individual over the duration of the entire tracking period (i.e., the prospecting range size).
Variables: column name (data type): description
- birdID (character): individual bird
- ProspectingRange (numeric): size of prospecting range (ha)
- n.locs (integer): number of locations in that observation
- Sex (character): sex of individual: male (M), female (F)
- Fledge.date.jd (integer): fledge date of the individual
Tab name: PreDeparture_PRThroughTime - How much area an individual explored over a roughly two-week period.
Variables: column name (data type): description
- obsID (character): observation ID
- birdID (character): individual bird
- hr (numeric): prospecting range size over the roughly two-week period (ha)
- hr.dur (integer): number of days in which the home range period covers (used as offset in models to control for variation in sampling effort)
- hr.n.locs (integer): numbers of locations that went into the estimation
- Sex (character): sex of individual: male (M), female (F)
- Fledge.date.jd (integer): fledge date of the individual day of year
- offspring.age (integer): days since fledge of the observation (aka days since fledge)
- hr.mean.rain (numeric): mean daily rainfall for the duration of the home range calculation period (mm)
- hr.total.rain (numeric): total rainfall over the duration of the home range calculation period (mm)
Tab name: PreDeparture_ProbabilityForay - For each observation period, whether the bird left the natal territory or not (i.e., did a foray or not*).
Variables: column name (data type): description
- obsID (character): observation ID
- birdID (character): individual bird
- foray (integer): count of the number of forays that occurred during the observation
- foray.bin (binomial): did a foray occur during the observation (1) or not (0)
- n.locs (integer): number of locations in that observation
- Sex (character): sex of individual: male (M), female (F)
- offspring.age (integer): days since fledge of the observation
- Fledge.date.jd (integer): fledge date of the individual
- rain.dayBF (numeric): rainfall form the day before the observation (mm)
Tab name: PreDeparture_ForayMaxDist - For each foray, we measured the maximum distance the individual traveled away from the center of the natal territory.
Variables: column name (data type): description
- obsID (character): observation ID
- birdID (character): individual bird
- forayID (character): foray ID within observation period
- disp (numeric): maximum distance traveled during the foray (m)
- n.locs (integer): number of locations in that observation
- Sex (character): sex of individual: male (M), female (F)
- Fledge.date.jd (integer): fledge date of the individual
- offspring.age (integer): days since fledge of the observation
- rain.dayBF (numeric): rainfall form the day before the observation (mm)
Floating stage
Tab name: Floater_FloatingRange - For each individual, the total area explored by the individual over the duration of the entire tracking period (i.e., the floating range size).
Variables: column name (data type): description
- birdID (character): individual bird
- hr (numeric): size of floating range (ha)
- nobs (integer): number of locations in that observation
- sex (character): sex of individual: male, female
- age.departure (integer): age at departure (aka dispersal)
- fledge.date.jd (integer): fledge date of the individual
Tab name: Floater_FRThroughTime - How much area an individual explored over a roughly 17-day period.
Variables: column name (data type): description
- birdID (character): individual bird
- obsID (character): unique observation ID
- hr (numeric): exploration range size (ha)
- hr.dur (integer): duration of period in which exploration range was calculated (days)
- sex (character): sex of individual: male, female
- age.departure (integer): age at departure (aka dispersal)
- fledge.date.jd (integer): fledge date of the individual
- daysSinceDeparture (integer): days since departure (aka dispersal)
- hr.mean.rain (numeric): mean daily rainfall over the duration of the exploration range period (mm)
Tab name: Floater_DistTraveled - The distance traveled between observations periods.
Variables: column name (data type): description
- birdID (character): individual bird
- obsID (character): unique observation ID
- dist (numeric): distance traveled between the observation before and the current observation (m)
- daysBetween (integer): days between observations
- sex (character): sex of individual: male, female
- age.departure (integer): age at departure (aka dispersal)
- fledge.date.jd (integer): fledge date of the individual
- daysSinceDeparture (integer): days since departure (aka dispersal)
- rain.dayBF (numeric): rain before the observation (mm)
Access information
Other publicly accessible locations of the data:
- N/A
For a detailed description of the methods, please see the publication. In short, for both stages (pre-departure and floating), we radio-tracked an individual to its exact location (e.g., to a specific tree) and from those observations we generated four pre-departure stage and three floating stage movement metrics.
Pre-departure stage movement metrics include: (1) for each observation period, whether an individual bird left the natal territory or not, (2) for each foray, the maximum distance an individual traveled away from the center of the natal territory, (3) how much area an individual explored over a roughly two-week period, and (4) the total area explored by an individual over the duration of the entire tracking period.
Floating stage movement metrics include: (1) the distance traveled between observations periods, (2) how much area an individual explored over a roughly 17-day period, and (3) the total area explored by an individual over the duration of the entire tracking period.
References
Paton, Steve (2019). Barro Colorado Island, Clearing_Precipitation, manual. Smithsonian Tropical Research Institute. Dataset.