Growth rate and projected age at sexual maturity for immature hawksbill turtles and green turtles foraging in the remote marine protected area of Aldabra Atoll, Seychelles

Changes in marine ecosystems from human stressors, and concerns over how species will respond to these changes have emphasized the importance of understanding and monitoring crucial demographic parameters for population models. Long-lived, migratory, marine vertebrates such as sea turtles are partic...

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Vydáno v:Marine biology Ročník 170; číslo 4; s. 49
Hlavní autoři: Sanchez, Cheryl L., Bunbury, Nancy, Mortimer, Jeanne A., A’Bear, Luke, Betts, Michael, von Brandis, Rainer, Burt, April J., Cooke, Lorraine, van de Crommenacker, Janske, Currie, Jock C., Doak, Naomi, Fleischer-Dogley, Frauke, Mederic, Emma, Mels, Bruno, Pistorius, Pierre, Richards, Heather, Casale, Paolo
Médium: Journal Article
Jazyk:angličtina
Vydáno: Berlin/Heidelberg Springer Berlin Heidelberg 01.04.2023
Springer
Springer Nature B.V
Témata:
Aquatic reptiles
Atolls
Biomedical and Life Sciences
Body size
Carapace
Chelonia mydas
data collection
Environmental aspects
Eretmochelys imbricata
Food and nutrition
Foraging
Freshwater & Marine Ecology
Green turtle
Growth rate
Hawksbill turtle
humans
Impact analysis
International organizations
Islands
Life history
Life Sciences
Marine & Freshwater Sciences
Marine biology
Marine ecosystems
Marine parks
Marine parks and reserves
Marine protected areas
mark-recapture studies
Microbiology
migratory behavior
Oceanography
Original Paper
Parameters
Physiological aspects
Population dynamics
Population growth
Protected areas
Reptiles & amphibians
Sea turtles
Sexual maturity
Seychelles
Tracking
Turtles
United Nations Educational, Scientific and Cultural Organization
Vertebrates
World Heritage Areas
Zoology
Seychelles
Developmental habitat
Western Indian Ocean
Capture-mark-recapture
ISSN:0025-3162, 1432-1793
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Shrnutí:Changes in marine ecosystems from human stressors, and concerns over how species will respond to these changes have emphasized the importance of understanding and monitoring crucial demographic parameters for population models. Long-lived, migratory, marine vertebrates such as sea turtles are particularly vulnerable to changes. Life-history parameters like growth-in-body size can be largely influenced by environmental processes which can impact population growth. We analyzed a 40-year (1981–2021) capture-mark-recapture dataset from the protected UNESCO World Heritage Site, Aldabra Atoll, Seychelles, to estimate key population parameters, including body growth, for immature green turtles ( Chelonia mydas ) and hawksbill turtles ( Eretmochelys imbricata ). Curved carapace length (CCL) range was 34.3–110.9 cm (mean ± SD: 51.0 ± 11.4 cm, n = 1191) for green turtles and 28.7–89.4 cm (47.7 ± 14.4 cm, n = 538) for hawksbill turtles. Recapture events, with an 11-month minimum period, revealed a mean annual growth rate of 3.2 ± 1.5 cm year −1 for green turtles (n = 75) and 2.8 ± 1.4 cm year −1 for hawksbill turtles (n = 110). Hawksbill turtles exhibited a non-monotonic growth rate while no significant growth-size relationship was detected for green turtles. Green turtle mean annual growth per 10-cm size class was highest in the larger size classes (50‒69.9 cm). Hawksbill turtle growth rate was highest in the larger size classes (50‒69.9 cm) then declined in the largest size class (70‒79.9 cm). Green turtles and hawksbill turtles may spend > 8 and 18 years, respectively, using Aldabra, Seychelles, as a foraging ground.
Bibliografie:ObjectType-Article-1
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ISSN:0025-3162
1432-1793
DOI:10.1007/s00227-023-04197-1