Cetaceans from low-latitude oceanic waters rely on mesopelagic prey
- 1Institute of Marine Sciences - OKEANOS and Institute of Marine Research - IMAR, University of the Azores
- 2Møreforsking AS
- 3Observatoire Pelagis, UAR 3462, La Rochelle Université – CNRS
Abstract
The mesopelagic zone increasingly attracts the interest of commercial fisheries due to its large fish abundance and the growing worldwide demand for food. Many mesopelagic species serve as an important food source for many top predators but the extent to which these predators rely on mesopelagic prey remain poorly understood, especially in oligotrophic open ocean ecosystems. The Azores archipelago is surrounded by numerous seamounts and is subject to a dynamic oceanography, creating particularly attractive conditions for many top predators, including cetaceans. Using stable isotope mixing models (MixSIAR), we estimated diet proportions of seven species of cetaceans belonging to various trophic guilds. Overall, mesopelagic prey are key contributors to the diet of cetaceans. We find that Balaenoptera borealis, B. musculus and B. physalus consume mostly (> 70%) mesopelagic zooplankton (including copepods and krill). Mesopelagic fish and cephalopods contribute 20–35% to the diet of Delphinus delphis, Stenella frontalis and Tursiops truncatus, along with epipelagic and demersal fish. The diet of Physeter macrocephalus almost exclusively consists of mesopelagic cephalopods (> 94%). This study identifies mesopelagic fauna as a critical food resource for cetaceans in tropical and sub-tropical oceanic ecosystems, emphasizing the need for a precautionary approach and strict governance measures before developing commercial fisheries in the mesopelagic zone.
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BibTeX
@article{lebon2026cetaceans,
title = {{Cetaceans from low-latitude oceanic waters rely on mesopelagic prey}},
author = {Myriam Lebon and Eva García-Seoane and Ana Colaço and Gui Menezes and Jérôme Spitz and Mónica A. Silva},
journal = {Scientific Reports},
year = {2026},
month = jul,
doi = {10.1038/s41598-026-57624-w},
url = {https://doi.org/10.1038/s41598-026-57624-w},
note = {CC BY},
}
RIS
TY - JOUR
TI - Cetaceans from low-latitude oceanic waters rely on mesopelagic prey
AU - Myriam Lebon
AU - Eva García-Seoane
AU - Ana Colaço
AU - Gui Menezes
AU - Jérôme Spitz
AU - Mónica A. Silva
PY - 2026
DA - 2026/07/01
JO - Scientific Reports
DO - 10.1038/s41598-026-57624-w
UR - https://doi.org/10.1038/s41598-026-57624-w
AB - The mesopelagic zone increasingly attracts the interest of commercial fisheries due to its large fish abundance and the growing worldwide demand for food. Many mesopelagic species serve as an important food source for many top predators but the extent to which these predators rely on mesopelagic prey remain poorly understood, especially in oligotrophic open ocean ecosystems. The Azores archipelago is surrounded by numerous seamounts and is subject to a dynamic oceanography, creating particularly attractive conditions for many top predators, including cetaceans. Using stable isotope mixing models (MixSIAR), we estimated diet proportions of seven species of cetaceans belonging to various trophic guilds. Overall, mesopelagic prey are key contributors to the diet of cetaceans. We find that Balaenoptera borealis, B. musculus and B. physalus consume mostly (> 70%) mesopelagic zooplankton (including copepods and krill). Mesopelagic fish and cephalopods contribute 20–35% to the diet of Delphinus delphis, Stenella frontalis and Tursiops truncatus, along with epipelagic and demersal fish. The diet of Physeter macrocephalus almost exclusively consists of mesopelagic cephalopods (> 94%). This study identifies mesopelagic fauna as a critical food resource for cetaceans in tropical and sub-tropical oceanic ecosystems, emphasizing the need for a precautionary approach and strict governance measures before developing commercial fisheries in the mesopelagic zone.
SN - 2045-2322
ER -