Foraging Responses of Black-Legged Kittiwakes to Prolonged Food-Shortages around Colonies on the Bering Sea Shelf Public Deposited

http://ir.library.oregonstate.edu/concern/articles/rf55z927z

This is the publisher’s final pdf. The article was published by the Public Library of Science and is in the public domain. The published article can be found at:  http://www.plosone.org/.

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • We hypothesized that changes in southeastern Bering Sea foraging conditions for black-legged kittiwakes (Rissa tridactyla) have caused shifts in habitat use with direct implications for population trends. To test this, we compared at-sea distribution, breeding performance, and nutritional stress of kittiwakes in three years (2008–2010) at two sites in the Pribilof Islands, where the population has either declined (St. Paul) or remained stable (St. George). Foraging conditions were assessed from changes in (1) bird diets, (2) the biomass and distribution of juvenile pollock (Theragra chalcogramma) in 2008 and 2009, and (3) eddy kinetic energy (EKE; considered to be a proxy for oceanic prey availability). In years when biomass of juvenile pollock was low and patchily distributed in shelf regions, kittiwake diets included little or no neritic prey and a much higher occurrence of oceanic prey (e.g. myctophids). Birds from both islands foraged on the nearby shelves, or made substantially longer-distance trips overnight to the basin. Here, feeding was more nocturnal and crepuscular than on the shelf, and often occurred near anticyclonic, or inside cyclonic eddies. As expected from colony location, birds from St. Paul used neritic waters more frequently, whereas birds from St. George typically foraged in oceanic waters. Despite these distinctive foraging patterns, there were no significant differences between colonies in chick feeding rates or fledging success. High EKE in 2010 coincided with a 63% increase in use of the basin by birds from St. Paul compared with 2008 when EKE was low. Nonetheless, adult nutritional stress, which was relatively high across years at both colonies, peaked in birds from St. Paul in 2010. Diminishing food resources in nearby shelf habitats may have contributed to kittiwake population declines at St Paul, possibly driven by increased adult mortality or breeding desertion due to high foraging effort and nutritional stress.
Resource Type
DOI
Date Available
Date Issued
Citation
  • Paredes R, Orben RA, Suryan RM, Irons DB, Roby DD, et al. (2014) Foraging Responses of Black-Legged Kittiwakes to Prolonged Food-Shortages around Colonies on the Bering Sea Shelf. PLoS ONE 9(3): e92520. doi:10.1371/journal.pone.0092520
Series
Rights Statement
Funding Statement (additional comments about funding)
Publisher
Peer Reviewed
Language
Replaces
Additional Information
  • description.provenance : Made available in DSpace on 2014-05-19T19:47:25Z (GMT). No. of bitstreams: 3 license_rdf: 1089 bytes, checksum: 0a703d871bf062c5fdc7850b1496693b (MD5) RobyDanielFisheriesWildlifeForagingResponsesBlack-Legged.pdf: 2194473 bytes, checksum: 37bf79ea7feff3a719e5b927a4222513 (MD5) RobyDanielFisheriesWildlifeForagingResponsesBlack-Legged_AppendixS1.pdf: 78811 bytes, checksum: 90d762deebf7865daec5df1eba25f7b9 (MD5) Previous issue date: 2014-03-26
  • description.provenance : Approved for entry into archive by Erin Clark(erin.clark@oregonstate.edu) on 2014-05-19T19:47:25Z (GMT) No. of bitstreams: 3 license_rdf: 1089 bytes, checksum: 0a703d871bf062c5fdc7850b1496693b (MD5) RobyDanielFisheriesWildlifeForagingResponsesBlack-Legged.pdf: 2194473 bytes, checksum: 37bf79ea7feff3a719e5b927a4222513 (MD5) RobyDanielFisheriesWildlifeForagingResponsesBlack-Legged_AppendixS1.pdf: 78811 bytes, checksum: 90d762deebf7865daec5df1eba25f7b9 (MD5)
  • description.provenance : Submitted by Erin Clark (erin.clark@oregonstate.edu) on 2014-05-19T19:47:04Z No. of bitstreams: 3 license_rdf: 1089 bytes, checksum: 0a703d871bf062c5fdc7850b1496693b (MD5) RobyDanielFisheriesWildlifeForagingResponsesBlack-Legged.pdf: 2194473 bytes, checksum: 37bf79ea7feff3a719e5b927a4222513 (MD5) RobyDanielFisheriesWildlifeForagingResponsesBlack-Legged_AppendixS1.pdf: 78811 bytes, checksum: 90d762deebf7865daec5df1eba25f7b9 (MD5)

Relationships

In Administrative Set:
Last modified: 07/26/2017 Default
Citations:

EndNote | Zotero | Mendeley

Items