St. Vincent-Bequia Channel IMMA
Size in Square Kilometres
257 km2
Qualifying Species and Criteria
Dwarf Sperm Whale – Kogia sima
Criterion B (2)
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Summary
The IMMA is located on the south-western coast of the island of St. Vincent in the Eastern Caribbean. It encompasses part of the east coast of St. Vincent and Bequia and the channel between these islands. The main island of St. Vincent is of volcanic origin and is surrounded by a steep insular slope. This IMMA hosts important concentrations of dwarf sperm whales (Kogia sima). Encounter rates of dwarf sperm whales are the highest recorded at the global scale. Twelve other cetacean species have been recorded in the area and are featured in more detail in a wider Eastern Caribbean IMMA.
Description of Qualifying Criteria
Criterion B: Distribution and Abundance
Sub-criterion B2: Aggregations
Data from boat-based surveys in the region indicate that encounter rates of dwarf sperm whales (Kogia sima) in this IMMA are the highest ever recorded on a global scale (MacLeod et al., 2004, Kiszka et al. 2024, Baird et al., 2021). Indeed, encounter rates off St. Vincent are almost 20 times higher than off the Big Island of Hawaiʻi (Baird et al., 2021) and about four times higher than off Abaco in the Bahamas (MacLeod et al., 2004). Data also suggest that the cetacean community of St. Vincent has a unique composition as 37% of all cetacean sightings are dwarf sperm whales, whereas this proportion is 3.5% off the main island of Hawaiʻi (Baird et al., 2021), for example. Site fidelity is unknown, and the full extent of the population using this area’s home range remains unknown (Kiszka et al. 2024). A photo-identification catalogue was initiated in 2022, resulting in the identification of 22 individuals (including two females accompanied by a calf). No re-sightings have been recorded, neither within field seasons nor between years, which suggests that only a small proportion of the population was identified, or that the range of the population is much larger that the area of study within the IMMA. Future dedicated field efforts will attempt to investigate site fidelity and the abundance of dwarf sperm whales off St. Vincent.
Supporting Information
Baird, R.W., Mahaffy, S.D., Lerma, J.K., 2021. Site fidelity, spatial use, and behavior of dwarf sperm whales in Hawaiian waters: using small‐boat surveys, photo‐identification, and unmanned aerial systems to study a difficult‐to‐study species. Marine Mammal Science, 38: 326-348.
Caldwell, D.K., Caldwell, M.C. & Arrindell, G., 1973. Dwarf sperm whales, Kogia simus, from the Lesser Antillean island of St. Vincent. Journal of Mammalogy, 54: 515-517.
Fielding, R. & Kiszka, J., 2021. Artisanal and aboriginal subsistence whaling in St. Vincent and the Grenadines (Eastern Caribbean): history, catch characteristics and needs for research and management. Frontiers in Marine Science, 8: 668597.
Hemsi, S., Caputo, M., Heithaus, M.R. & Kiszka, J., 2024. Variability in community structure, occurrence and group dynamics of odontocete cetaceans in the eastern Caribbean. Unpublished report to the National Science Foundation, Florida International University. 25pp.
Kiszka, J., Maricato, G. & Caputo, M., 2024. Habitat suitability, occurrence, and behavior of dwarf sperm whales (Kogia sima) off St. Vincent and the Grenadines, Eastern Caribbean. Advances in Marine Biology (in review).
Marin, D., Kiszka, J. & Caballero, S. (submitted). Genetic population structure of the pantropical spotted dolphin in the Caribbean region.
Restrepo Garzon, N., Kiszka, J., Martínez, J.G., Mignucci, A., Castelblanco-Martínez, N., Niño-Torres, C.A., Fielding, R., Bergfelt, D. & Caballero, S., 2024. Population genomics of the short-finned pilot whale (Globicephala macrorhynchus) in the Caribbean: implications for the management of artisanal whaling. Unpublished report.
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