AMLR Temperature Recording Archival Tags Gentoos 2005-2008 v1.2
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.
Complete Metadata
| @type | dcat:Dataset |
|---|---|
| accessLevel | non-public |
| contactPoint |
{
"fn": "Hinke, Jefferson",
"@type": "vcard:Contact",
"hasEmail": "mailto:jefferson.hinke@noaa.gov"
}
|
| describedByType | application/octet-steam |
| description | 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. |
| distribution |
[
{
"@type": "dcat:Distribution",
"title": "162405.1.1.tar.gz",
"mediaType": "placeholder/value",
"downloadURL": "https://doi.org/10.7289/V50G3H6Z",
"describedByType": "application/octet-steam"
},
{
"@type": "dcat:Distribution",
"title": "NOAA Data Management Plan (DMP)",
"mediaType": "placeholder/value",
"description": "NOAA Data Management Plan for this record on InPort.",
"downloadURL": "https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/swfsc/dmp/pdf/37066.pdf",
"describedByType": "application/octet-steam"
},
{
"@type": "dcat:Distribution",
"title": "GCMD Keyword Forum Page",
"mediaType": "placeholder/value",
"description": "Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords",
"downloadURL": "https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords",
"describedByType": "application/octet-steam"
},
{
"@type": "dcat:Distribution",
"title": "Full Metadata Record",
"mediaType": "placeholder/value",
"description": "View the complete metadata record on InPort for more information about this dataset.",
"downloadURL": "https://www.fisheries.noaa.gov/inport/item/37066",
"describedByType": "application/octet-steam"
}
]
|
| identifier | gov.noaa.nmfs.inport:37066 |
| issued | 2005-01-01T00:00:00.000+00:00 |
| keyword |
[
"AMLR",
"Euphausia superba",
"Pygoscelis",
"archival tag",
"ecosystem",
"environmental",
"gentoo",
"krill",
"penguins",
"seasonality",
"temperature",
"winter consumption",
"Admiralty Bay",
"Antarctic",
"Antarctica",
"Bransfield Strait",
"Cape Shirreff",
"Copacabana",
"King George Island",
"Livingston Island",
"South Shetlands",
"DOC/NOAA/NMFS/SWFSC > Southwest Fisheries Science Center, National Marine Fisheries Service, NOAA. U.S. Department of Commerce",
"AMLR Temperature Recording Archival Tags Gentoos 2005-2008 v1.2"
]
|
| landingPage | https://www.fisheries.noaa.gov/inport/item/37066 |
| language |
[]
|
| license | https://creativecommons.org/publicdomain/zero/1.0/ |
| modified | 2005-01-01T00:00:00.000+00:00 |
| publisher |
{
"name": "Southwest Fisheries Science Center",
"@type": "org:Organization"
}
|
| references |
[
"https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/swfsc/dmp/pdf/37066.pdf"
]
|
| rights | otherRestrictions, unclassified |
| spatial | -43.0,-65.0,-64.0,-58.0 |
| temporal | 2005-01-01T00:00:00+00:00/2008-01-01T00:00:00+00:00 |
| title | AMLR Temperature Recording Archival Tags Gentoos 2005-2008 v1.2 |
