Feeding Behavior and Estimated Energy Budget of the Forster's Tern

Metadata Updated: December 11, 2019

Foraging behavior and success of the Forster's tern (Sterna forsteri) were studied at Tulelake National Wildlife Refuge, California. Three methods of feeding were observed, contact dipping and hawking for insects, and surface plunging for fish. Feeding activity was bimodal with peaks between 0700-0900 and 1700-1900. Success rates and frequencies of hawking were highest (100%, 660 attempts/hour) followed by contact dipping (83%, 354 attempts/hour) and plunging (32%, 20/hour). Success rate and frequency of contact dipping were greatest at mid-day. Estimated cost for daily energy expenditure was 185.8 kcal/ day. Daily caloric intake was estimated at 208.85 kcal/day. Activity was initiated at .64 lux and terminated at 67 lux. Foraging of dipping and plunging birds was directed against the wind. Intra- and inter-specific aggressive encounters were seen most often during fishing activity and appeared to detract from rate of plunging. Foraging behavior of juveniles observed was markedly different from that of adults.

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Public: This dataset is intended for public access and use. 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.

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Metadata Created Date December 11, 2019
Metadata Updated Date December 11, 2019

Metadata Source

Harvested from DOI CKAN Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Created Date December 11, 2019
Metadata Updated Date December 11, 2019
Publisher Fish and Wildlife Service
Unique Identifier FWS_ServCat_60214
Brent Frakes
Maintainer Email
Public Access Level public
Bureau Code 010:18
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID C:\Program Files (x86)\FWS\DataStore\Application\OpenData\FWS_ServCat_v1_1.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id e6e63352-90d0-474f-a443-bb4e652e4c16
Harvest Source Id 34ce571b-cb98-4e0b-979f-30f9ecc452c5
Harvest Source Title DOI CKAN Harvest Source
Data First Published 1978-01-01
Homepage URL https://ecos.fws.gov/ServCat/Reference/Profile/60214
Data Last Modified 1978-01-01
Program Code 010:094, 010:028
Related Documents "https://ecos.fws.gov/ServCat/Reference/Profile/60214"
Source Datajson Identifier true
Source Hash bf99fff8ef4bb28543bb3c1c052eb7bfc4d9a2f1
Source Schema Version 1.1
Spatial -122.096222,41.793705,-121.0586,43.0671844
Temporal 1978-01-01/1978-01-01
Category "Unpublished Report"

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