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.

Data and Resources

Additional Info

Field Value
Last Updated August 6, 2019, 05:59
Created October 23, 2018, 05:18
access_constraints ["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
contact-email Jefferson.Hinke@noaa.gov
coupled-resource []
dataset-reference-date [{"type": "creation", "value": "2005"}, {"type": "publication", "value": ""}]
frequency-of-update asNeeded
guid gov.noaa.nmfs.inport:37066
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."]
metadata-date 2019-07-22T16:15:23
metadata-language eng
progress completed
resource-type dataset
responsible-party [{"name": "", "roles": ["pointOfContact", "custodian"]}]
spatial {"type": "Polygon", "coordinates": [[[-64.0, -65.0], [-43.0, -65.0], [-43.0, -58.0], [-64.0, -58.0], [-64.0, -65.0]]]}
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temporal-extent-begin 2005
temporal-extent-end 2008