USGS Western Ecological Research Center

Home Who We Are Where We Are What We Do Products Search Outreach Jobs Contacts

FORAGING ECOLOGY AND SPATIAL OVERLAP AT SEA AMONG THREE PELECANIFORM SEABIRD SPECIES BREEDING ON LEHUA ISLET, HAWAII

Released: 2015
Citation:
Felis, J, J Adams, S Judge, B Henry, DM Pereksta. 2015. FORAGING ECOLOGY AND SPATIAL OVERLAP AT SEA AMONG THREE PELECANIFORM SEABIRD SPECIES BREEDING ON LEHUA ISLET, HAWAII. Pacific Seabird Group, 42nd Annual Meeting, 18-21 February 2015, San Jose, CA. [Poster Presentation]

In 2013, we initiated at-sea tracking studies of main Hawaiian island seabirds to help assess potential risks of proposed offshore energy developments. As part of a larger multispecies and multicolony study, we equipped nesting Red-footed Boobies (Sula sula), Brown Boobies (S. leucogaster), and Red-tailed Tropicbirds (Phaethon rubricauda) with global positioning unit (GPS) tracking devices and time-depth recorders (TDRs) on Lehua Islet (32 km west of Kaua’i). Herein, we present preliminary results that quantify several foraging parameters for each species (e.g. mean trip duration, time spent on water, dive depth/location). Additionally, we evaluated intra-seasonal parameter variation and the degree of inter-specific spatial overlap at sea. In 2014, deployments ranged from 2 to 7 days during three breeding-season sessions (May, June, and July). The sympatric boobies primarily conducted single day foraging trips during daylight hours. Brown Boobies generally foraged closer to Lehua (≤55 km maximum range) and often utilized nearshore habitat, whereas Red-footed Boobies ranged farther offshore (≤240 km maximum range) and foraged in pelagic waters. Red-tailed Tropicbird trip durations were more variable and lasted from a few hours to 7 days, ranging up to 475 km from the colony. Novel tracking data will support management directives to delineate spatially and temporally important marine areas for seabirds and commensal predators (pelagic fishes and cetaceans) in waters surrounding the main Hawaiian islands.



This product is associated with the following project:
Main Hawaiian Islands Seabird Tracking Study

Bookmark and Share

Share


Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: webmaster@werc.usgs.gov

References to non-U.S. Department of Interior (DOI) products do not constitute an endorsement by the DOI.

* DOI and USGS link policies apply.