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Multidecadal comparison of Red-footed Booby Sula sula diet at Ulupa'u Crater, O'ahu, Hawai'i
Citation
DONAHUE, S.E., ADAMS J. & HYRENBACH, K.D. 2021. Multidecadal comparison of Red-footed Booby Sula sula diet at Ulupa'u Crater, O'ahu, Hawai'i.
Marine Ornithology 49: 51
- 55
http://doi.org/10.5038/2074-1235.49.1.1398
Received 24 June 2020, accepted 22 September 2020
Date Published: 2021/04/15
Date Online: 2021/02/20
Key words: Red-footed Booby, Sula sula, regurgitation, diet, Hawai'i, Purpleback Flying Squid, Sthenoteuthis oualaniensis
Abstract
We describe the diet of Red-footed Boobies Sula sula nesting at Ulupaʻu Crater, Oʻahu, Hawaiʻi based on 106 regurgitations collected during 2014 and 2015. We also compare our results to a diet study at this colony five decades earlier. Both studies indicate that flying squid (Ommastrephidae) and flyingfish (Exocoetidae) are important prey for this population while provisioning chicks. In particular, Purpleback Flying Squid Sthenoteuthis oualaniensis occurred in the majority (> 70%) of the recent regurgitation samples, and their size (mantle length < 11 cm) indicates that they were mostly juveniles. Moreover, the size distribution of the squid prey varied by year, indicating inter-annual variability in the phenology of spawning and larval development. This study highlights the reliance of Red-footed Boobies on juveniles of this poorly-studied squid and underscores their value as biological samplers of epipelagic fish and squid within their foraging ranges.
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