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Title: Spatiotemporal distribution and sexual segregation in the Critically Endangered angelshark Squatina squatina in Spain’s largest marine reserve
Authors: Mead, Lucy R.
Jiménez Alvarado, David 
Meyers, Eva
Barker, Joanna
Sealey, Michael
Caro, Maria Belén
Toledo, Hector
Pike, Charlotte
Gollock, Matthew
Piper, Adam
Schofield, Gail
Herraiz, Edy
Jacoby, David M.P.
UNESCO Clasification: 310503 Localización de peces
310504 Protección de los peces
Keywords: Acoustic Telemetry
Sexual Segregation, et al
Issue Date: 2023
Journal: Endangered Species Research 
Abstract: Establishing how threatened wildlife are distributed spatially and temporally is essential for effective conservation and management planning. While many shark species are threatened globally, knowledge on sex-specific differences in behaviour and fine-scale habitat use remains limited, hindering the implementation of appropriate conservation actions. Here, acoustic telemetry was used to investigate sexspecific space use in the Critically Endangered angelshark Squatina squatina in the Canary Islands (Atlantic Ocean), a key stronghold for the species. We collected data on space use, residency and movement of adult males (n = 32) and females (n = 72) in Spain’s largest marine reserve (La Graciosa Marine Reserve) over 4 yr (2018−2022). Presence in offshore sites (>80 m depth) indicated long-term utilisation of deep-water habitat, not previously observed in this species. Males were more likely to be detected in deep water and displayed significantly greater levels of activity and roaming behaviour than females. Patterns of behaviour in shallow waters indicated both social and habitat sexual segregation. Diel variability was also recorded, with greater activity occurring nocturnally. This study demonstrates the importance of considering the spatiotemporal distribution of both sexes, horizontally and vertically, when designing effective conservation measures.
ISSN: 1863-5407
DOI: 10.3354/esr01255
Source: Endangered Species Researc h[ISSN 1863-5407], v. 51, p. 233-248, (Enero 2023)
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