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First insights into the diet composition of Madeiran and Monteiro’s storm petrels (Hydrobates castro and H. monteiroi) breeding in the Azores

Carreiro, Ana R., Bried, Joel, Deakin, Zoe, Booth Jones, Katherine, Thomas, Robert J., Symondson, William O.C., Ramos, Jaime A. and Medeiros, Renata 2022. First insights into the diet composition of Madeiran and Monteiro’s storm petrels (Hydrobates castro and H. monteiroi) breeding in the Azores. Waterbirds 44 (3) , pp. 300-307. 10.1675/063.044.0304

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Abstract

Although studying the diet of threatened species is crucial in terms of conservation, the diet of the Madeiran Storm Petrel (Hydrobates castro) and the vulnerable, Azores-endemic Monteiro's Storm Petrel (H. monteiroi) is mostly unknown. The only information available to date comes from anecdotal observations, analysis of mercury levels and stable isotopes. Here is presented the first insights into prey consumption by adults and chicks from the two species breeding in the Azores Archipelago, Portugal, in the mid-Atlantic Ocean. The rapidly developing field of metabarcoding was used to identify dietary items from fecal samples, to species level where possible. A total of thirteen fish, five cephalopod, one crustacean and two oligochaete operational taxonomic units (OTUs) were detected. Results suggest that both petrel species feed mainly on myctophid fish. However, differences were detected between the prey species consumed by (i) H. monteiroi and H. castro, (ii) two distinct H. castro populations (Vila and Praia islets), and (iii) chicks and adults within the same population.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Dentistry
Publisher: Waterbird Society
ISSN: 1524-4695
Date of First Compliant Deposit: 9 May 2022
Date of Acceptance: 4 February 2021
Last Modified: 06 Jul 2022 16:26
URI: https://orca.cardiff.ac.uk/id/eprint/149623

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