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Abstract
ESR Endangered Species Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials ESR 35:23-37 (2018) - DOI: https://doi.org/10.3354/esr00864 Theme Section: Biologging in conservation Ontogenetic changes in at-sea distributions of immature short-tailed albatrosses Phoebastria albatrus Rachael A. Orben1,*, Amelia J. O’Connor2, Robert M. Suryan1,3, Kiyoaki Ozaki4, Fumio Sato4, Tomohiro Deguchi4 1Department of Fisheries and Wildlife, Oregon State University, Hatfield Marine Science Center, 2030 SE Marine Science Drive, Newport, Oregon 97365, USA 2College of Earth, Ocean, and Atmospheric Science, Oregon State University, 104 CEOAS Administration Building, Corvallis, Oregon 97331, USA 3NOAA Fisheries, Alaska Fisheries Science Center, Auke Bay Laboratories, Ted Steven's Marine Research Institute, 17109 Pt. Lena Loop Rd., Juneau, Alaska 99801, USA 4Division of Avian Conservation, Yamashina Institute for Ornithology, 115 Konoyama, Abiko, Chiba 270-11, Japan *Corresponding author: raorben@gmail.com ABSTRACT: The ability of juveniles of wide-ranging species to locate distant foraging regions can rely on innate or learned information. Reliance on innate cues could be problematic when conservation actions facilitate reintroduction. In the North Pacific, the short-tailed albatross Phoebastria albatrus is recovering from extensive harvesting, and has recently benefited from translocation efforts. Yet little is known about how naïve juveniles disperse or about individual distributions of immature short-tailed albatrosses. The primary goals of this study were to quantify the ontogeny of movement patterns and spatial distributions and compare these between naturally reared and translocated short-tailed albatrosses. We tracked 51 albatrosses for up to 5 years post-fledging: naturally reared chicks from their natal colony on Torishima, Japan, and chicks that were translocated 350 km to the southeast to Mukojima, Japan. Initial, more northerly dispersal of translocated fledglings suggests the ability to adjust to a new departure location. Fledglings’ departure paths differed from previously tracked adults departing Torishima, yet like adults, the majority of fledglings (81%) reached the Bering Sea that first summer, further supporting large-scale innate orientation abilities. Juveniles showed strong seasonal changes in distributions, traveling more in winter and occupying regions not typically used by adults (e.g. California Current, Sea of Okhotsk). As they aged, juveniles began to exhibit habitat fidelity to shelf-break regions, as anticipated from prior studies, yet continued to explore new regions with low levels of spatial fidelity. Juvenile short-tailed albatrosses explored almost the entire species range, highlighting the impressive capacity of individuals to transverse the North Pacific. KEY WORDS: Post-fledging migration · Juvenile distribution · Dispersal · Year-round tracking · Seabird · Home range · Albatross · GPS tracking Full text in pdf format Supplementary material PreviousNextCite this article as: Orben RA, O’Connor AJ, Suryan RM, Ozaki K, Sato F, Deguchi T (2018) Ontogenetic changes in at-sea distributions of immature short-tailed albatrosses Phoebastria albatrus. Endang Species Res 35:23-37. https://doi.org/10.3354/esr00864 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in ESR Vol. 35. Online publication date: January 15, 2018 Print ISSN: 1863-5407; Online ISSN: 1613-4796 Copyright © 2018 Inter-Research.
Highlights
Juveniles of highly mobile species must successfully navigate migration routes and travel to distant foraging grounds in order to survive
Some seabirds, fledge by themselves or in the company of other naïve individuals, and are initially reliant on innate compass directions and responses to environmental cues (Weimerskirch et al 2006, de Grissac et al 2016). Over time they develop foraging strategies that are similar to adults (Riotte-Lambert & Weimerskirch 2013, de Grissac et al 2017)
We qualitatively compare and discuss migratory routes and distributions of fledglings and previously tracked adults to better understand the potential for innate orientation and habitat preferences of juvenile birds. These analyses provide new insight into movement patterns of an understudied life history stage (Hazen et al 2012b) of a species recovering from near extinction, but still less than 1% of its historical population size
Summary
Juveniles of highly mobile species must successfully navigate migration routes and travel to distant foraging grounds in order to survive. Some seabirds, fledge by themselves or in the company of other naïve individuals, and are initially reliant on innate compass directions and responses to environmental cues (Weimerskirch et al 2006, de Grissac et al 2016). Over time they develop foraging strategies that are similar to adults (Riotte-Lambert & Weimerskirch 2013, de Grissac et al 2017). The importance of learning migration behavior and foraging area selection are likely key components of how marine predators will cope with climate-driven changes to ecosystems (Hazen et al 2012a). Flexibility may hinge on the capacity of juvenile individuals to explore new regions, in contrast to adults that exhibit restricted ranges and high fidelity to specific foraging areas (Baylis et al 2012, Costa et al 2012, Votier et al 2017)
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