Partial migration in Magellanic penguins
Data files
Nov 14, 2023 version files 14.97 MB
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Barrionuevo_Frere.xlsx
10.28 MB
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envMcmcTracks2.csv
4.69 MB
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README.md
1.65 KB
Abstract
We study the migration of Magellanic penguins at the southern tip of the breeding distribution. We found for the first time for this species evidence of partial migration within the same colony. Forty-three percent of the penguins studied stayed within ~290 km from the colony (residents), while others went northwards as far as 2000 km. All penguins spent the same amount of time at sea and traveled similar total distances, but residents experienced colder waters (2 °C less) and lower chlorophyll-a habitats than migrants. The two habitats are inhabited by different prey items, consequently giving the penguins different possibilities of prey items. We have shown individual strategies with high variability in the non-breeding dispersion behavior of Magellanic penguins, nonetheless, further research is required to understand the proximate and ultimate causes and the consequences of this behavior.
README: Partial migration in Magellanic penguins
https://doi.org/10.5061/dryad.n5tb2rc26
Data of tracked Magellanic penguins during their migration. This is a data set of 14 trips recorded during 2020 and 2021 of females and males from Cabo Vírgenes colony (52°21´S, 68°23´W). This data was recorded with MK3 and MK4 geolocators (Lotek, UK).
Description of the data and file structure
Excel file, Barrionuevo&Frere, has the time of the locations of the migration trips. Longitude and latitude are presented as mean and sd positions (in decimal degrees). Also, de 2.5 and 97.5 % of the distributions of the locations are shown. This allows us to set the error of the GLS.
- anio = year of the trips
- colonia = is the breeding colony of the penguins. In this case only Cabo Vírgenes.
- especie = study species, in this case, Magellanic penguins Spheniscus magellanicus.
- sexo= is a two-level factor with the sex of the penguins. hembra: female; macho: male.
- gls= is the id og the gls.
- id= is a unique random number for each track.
- anillo= is a unique identifier for each penguin. This is the real number of the rings of the penguins.
The CSV file, envMcmcTracks2.csv, has also the oceanographic variables for each location.
- id=is a unique random number for each trip
- date=is the date and hour of the positions.
- x=the longitud, decimals degrees
- y=the latitud, decimals degrees
- SST=sea surface temperature, in degrees Celsius
- depth=batymetry, in meters
- Slope= slope of the bathymetry, in meters
- ChlA= chlorophyll a concentrations, in mg/L
- salinity= salinity, in psu
Methods
We tracked 14 Magellanic penguins from the colony Cabo Vírgenes in 2020 and 2021. We used geolocators that were analyzed following the methods in Lisovski et al. (2020) and Barrionuevo et al. (2023).