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ID 117397
Title Alternative
Habitat use of rhinoceros auklets
Author
Sato, Takahiro Tokushima University
Yabuhara, Yuki Tokushima University
Okado, Jumpei Hokkaido University
Watanuki, Yutaka Hokkaido University
Yamauchi, Akihiro Tokushima University
Keywords
Cerorhinca monocerata
marine habitat
movement
GPS logger
conservation
Content Type
Journal Article
Description
At-sea habitat use of breeding seabirds is strongly influenced by marine environmental features that vary over space and time. The use of bio-loggers allows researchers to track fine-scale movements of seabirds and provides opportunities to identify the primary factors affecting their area use for foraging. Using GPS loggers, we tracked chick-rearing rhinoceros auklets (Cerorhinca monocerata), which are wing-propelled divers, at Daikoku Island, eastern Hokkaido, Japan. The central phase for foraging activity on birds' trips was determined using a multiple change points model. To examine environmental factors explaining the distribution of the foraging phase, a generalized additive model was used where sea surface temperature, chlorophyll a concentration, bathymetry, and distance from the colony were explanatory variables. To obtain information supporting the behavioral tracking, prey items in the bill-loads of adult auklets were collected. We found that auklets foraged over the continental shelf shallower than the 200-m isobath and that distance from the colony was related to the area use. Adult auklets predominately brought back age-0 chum salmon (Oncorhynchus keta), which was abundant in coastal waters along southeast Hokkaido during the study period. Our findings indicate that rhinoceros auklets rearing chicks, hence visiting nests frequently, on Daikoku Island can find suitable feeding grounds nearby.
Journal Title
Zoological Science
ISSN
02890003
NCID
AA10545874
AA11510015
Publisher
Zoological Society of Japan|BioOne
Volume
39
Issue
3
Start Page
261
End Page
269
Published Date
2022-02-17
EDB ID
DOI (Published Version)
URL ( Publisher's Version )
FullText File
language
eng
TextVersion
Publisher
departments
Science and Technology