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AMLR Temperature Recording Archival Tags Gentoos 2005-2008 v1.2

Metadata Updated: March 1, 2024

Estimates of daily activity and consequent demand for food during winter are scarce for many polar seabirds, yet essential for assessing constraints on foraging effort, demand for food, and potential competition with local fisheries. We affixed archival temperature tags to gentoo penguins (Pygoscelis papua) from two colonies in the South Shetland Islands to measure the frequency, timing, and duration of foraging trips and to estimate minimum food requirements during winter. Foraging trip frequencies ranged from 0.85 to 1.0 trips day-1 and were positively correlated with day length. Early winter foraging trips more closely matched day length than late winter foraging trips. The data suggest that individuals maximize foraging time during the early winter period, likely to recover body mass following the breeding season and molt. The more attenuated response of foraging trip durations to increasing day length in late winter may be related to differences in local resource availability or individual behaviors prior to the upcoming breeding season. Minimum food requirements also exhibited a seasonal cycle with a mid-winter minimum. On average, minimum food requirements were estimated at 0.70 ± 0.12 kg day-1. Extrapolated to the regional population of gentoo penguins, winter food requirements by gentoo penguins were equivalent to roughly 33% of annual krill catches by commercial fisheries in the South Shetland Island region over the past decade. Current expansion of the gentoo population and the krill fishery in the southern Scotia Sea warrants continued monitoring of gentoo penguins during winter.

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources

Dates

Metadata Date February 29, 2024
Metadata Created Date October 15, 2021
Metadata Updated Date March 1, 2024
Reference Date(s) 2005 (creation), (publication)
Frequency Of Update asNeeded

Metadata Source

Harvested from NMFS SWFSC

Additional Metadata

Resource Type Dataset
Metadata Date February 29, 2024
Metadata Created Date October 15, 2021
Metadata Updated Date March 1, 2024
Reference Date(s) 2005 (creation), (publication)
Responsible Party (Point of Contact, Custodian)
Contact Email
Guid gov.noaa.nmfs.inport:37066
Access Constraints Cite As: Southwest Fisheries Science Center, [Date of Access]: AMLR Temperature Recording Archival Tags Gentoos 2005-2008 v1.2 [Data Date Range], https://www.fisheries.noaa.gov/inport/item/37066., Access Constraints: None, Use Constraints: None, Distribution Liability: Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the National Marine Fisheries Service, US AMLR or its partners.
Bbox East Long -43
Bbox North Lat -58
Bbox South Lat -65
Bbox West Long -64
Coupled Resource
Frequency Of Update asNeeded
Harvest Object Id 2c0ea3af-7d86-4065-9201-4e9f06dd0267
Harvest Source Id bc62ff6c-c119-4409-94c7-7dd202b24462
Harvest Source Title NMFS SWFSC
Licence NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose.
Lineage Raw data are collected by researchers at land based stations, entered into data files, reviewed for QA/QC and later on shore-based servers.
Metadata Language eng
Metadata Type geospatial
Old Spatial {"type": "Polygon", "coordinates": [[[-64.0, -65.0], [-43.0, -65.0], [-43.0, -58.0], [-64.0, -58.0], [-64.0, -65.0]]]}
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2005
Temporal Extent End 2008

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