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Remote hideaways: first insights into the population sizes, habitat use and residency of manta rays at aggregation areas in Seychelles
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Remote hideaways: first insights into the population sizes, habitat use and residency of manta rays at aggregation areas in Seychelles
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Journal Article
Remote hideaways: first insights into the population sizes, habitat use and residency of manta rays at aggregation areas in Seychelles
2024
Overview
Understanding the aggregation and habitat use patterns of a species can aid the formulation and improved design of management strategies aiming to conserve vulnerable populations. We used photo-identification techniques and a novel remote underwater camera system to examine the population sizes, patterns of residency and habitat use of oceanic (
Mobula birostris
) and reef (
Mobula alfredi
) manta rays in Seychelles (5.42°S; 53.30°E) between July 2006 and December 2018. Sightings of
M. birostris
were infrequent (
n
= 5), suggesting that if aggregation areas for this species exist, they occur outside of the boundary of our study. A total of 236 individual
M. alfredi
were identified across all surveys, 66.5% of which were sighted at D’Arros Island (Amirante Group) and 22.5% at St. François Atoll (Alphonse Group). Males and females were evenly represented within the identified population.
M. alfredi
visited a cleaning station at D’Arros Island less frequently during dawn and dusk than at midday, likely due to the adoption of a crepuscular foraging strategy. The remote and isolated nature of the Amirante and Alphonse Group aggregation areas, coupled with the lack of a targeted mobulid fishery in Seychelles, suggests that with appropriate regulations and monitoring, the marine protected areas gazetted within these two groups will benefit the conservation of
M. alfredi
in Seychelles.
Publisher
Springer Berlin Heidelberg,Springer,Springer Nature B.V
Subject
