Jeanne A. Mortimer
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View article: Low growth rates at high population densities in sea turtles
Low growth rates at high population densities in sea turtles Open
Over 29 years (1996–2024) in a lagoon environment in the Chagos Archipelago (Indian Ocean) we conducted a mark-recapture growth rate study during which 135 juvenile hawksbill turtles ( Eretmochelys imbricata ) were each caught two or more …
View article: Assessing the impacts of satellite tagging on growth rates of immature hawksbill turtles
Assessing the impacts of satellite tagging on growth rates of immature hawksbill turtles Open
Animal‐borne devices including transmitters, data loggers and identification tags are widely used across taxa to address important biological and ecological questions. Some of these devices may affect fitness, hence studies to assess devic…
View article: Post-nesting migrations of green turtles from Aldabra Atoll, Seychelles: satellite tracking, flipper tag returns and marine protected areas
Post-nesting migrations of green turtles from Aldabra Atoll, Seychelles: satellite tracking, flipper tag returns and marine protected areas Open
To effectively implement protective measures for migratory species such as marine turtles, knowledge of their breeding grounds, foraging areas, migratory pathways and possible threats encountered is required. Aldabra Atoll, a UNESCO World …
View article: Small-scale movements and site fidelity of two sympatric sea turtle species at a remote atoll
Small-scale movements and site fidelity of two sympatric sea turtle species at a remote atoll Open
Understanding natural movement patterns and ecological roles of marine megafauna is a research priority best studied in areas with minimal human impact. The spatial distribution patterns specifically for immature turtles at foraging ground…
View article: Remote submerged banks and mesophotic ecosystems can provide key habitat for endangered marine megafauna
Remote submerged banks and mesophotic ecosystems can provide key habitat for endangered marine megafauna Open
The importance of some ecosystems remains poorly understood. We showed that mesophotic ecosystems (30 to 150 m) are a key habitat for a critically endangered species, with strong evidence that a globally important population of adult hawks…
View article: Intra-species variability in migratory movement of hawksbill turtles in the southwest Indian Ocean
Intra-species variability in migratory movement of hawksbill turtles in the southwest Indian Ocean Open
Implementing effective conservation measures to manage migratory populations is challenging, especially in a relatively inaccessible dynamic environment such as the ocean. With limited financial and human resources, efforts must be intelli…
View article: Mapping the National Seagrass Extent in Seychelles Using PlanetScope NICFI Data
Mapping the National Seagrass Extent in Seychelles Using PlanetScope NICFI Data Open
Seagrasses provide ecosystem services worth USD 2.28 trillion annually. However, their direct threats and our incomplete knowledge hamper our capabilities to protect and manage them. This study aims to evaluate if the NICFI Satellite Data …
View article: Synergistic use of <scp>UAV</scp> surveys, satellite tracking data, and mark‐recapture to estimate abundance of elusive species
Synergistic use of <span>UAV</span> surveys, satellite tracking data, and mark‐recapture to estimate abundance of elusive species Open
Estimating population abundance is central to many ecological studies and important in conservation planning. Yet the elusive nature of many species makes estimating their abundance challenging. Abundance estimates of sea turtles, marine b…
View article: 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
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 Open
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,…
View article: Long-term changes in adult size of green turtles at Aldabra Atoll and implications for clutch size, sexual dimorphism and growth rates
Long-term changes in adult size of green turtles at Aldabra Atoll and implications for clutch size, sexual dimorphism and growth rates Open
Around the world, declines in the mean size of nesting sea turtles have been reported with concerns of a concomitant decrease in the reproductive output of populations. Here, we explore this possibility using long-term observations of gree…
View article: Travel routes to remote ocean targets reveal the map sense resolution for a marine migrant
Travel routes to remote ocean targets reveal the map sense resolution for a marine migrant Open
How animals navigate across the ocean to isolated targets remains perplexing greater than 150 years since this question was considered by Charles Darwin. To help solve this long-standing enigma, we considered the likely resolution of any m…
View article: Marine turtles of the African east coast: current knowledge and priorities for conservation and research
Marine turtles of the African east coast: current knowledge and priorities for conservation and research Open
Although published literature regarding the 5 species of marine turtle found along the continental African east coast has grown substantially over the last decades, a comprehensive synthesis of their status and ecology is lacking. Using a …
View article: Table S1. The raw Fastloc-GPS tracking data for hawksbill turtles. from Travel routes to remote ocean targets reveal the map sense resolution for a marine migrant
Table S1. The raw Fastloc-GPS tracking data for hawksbill turtles. from Travel routes to remote ocean targets reveal the map sense resolution for a marine migrant Open
How animals navigate across the ocean to isolated targets remains perplexing greater than 150 years since this question was considered by Charles Darwin. To help solve this long-standing enigma, we considered the likely resolution of any m…
View article: Reef benthos of Seychelles - A field guide
Reef benthos of Seychelles - A field guide Open
During the 2019 First Descent: Seychelles Expedition, shallow and deep reef ecosystems of the Seychelles Outer Islands were studied by deploying a variety of underwater technologies to survey their benthic flora and fauna. Submersibles, re…
View article: Data from: High accuracy tracking reveals how small conservation areas can protect marine megafauna
Data from: High accuracy tracking reveals how small conservation areas can protect marine megafauna Open
Space use estimates can inform conservation management but relaying high-accuracy locations is often not straightforward. We used Fastloc-GPS Argos satellite tags with the innovation of additional data relay via a ground station (termed a …
View article: A global review of green turtle diet: sea surface temperature as a potential driver of omnivory levels
A global review of green turtle diet: sea surface temperature as a potential driver of omnivory levels Open
To better understand dietary requirements, trophic shifts, and trophic interactions of the threatened green turtle ( Chelonia mydas ), we conducted a comprehensive global review and literature tabulation (177 studies) reporting diets of in…
View article: Seascape Genetics and the Spatial Ecology of Juvenile Green Turtles
Seascape Genetics and the Spatial Ecology of Juvenile Green Turtles Open
Understanding how ocean currents impact the distribution and connectivity of marine species, provides vital information for the effective conservation management of migratory marine animals. Here, we used a combination of molecular genetic…
View article: Estimates of marine turtle nesting populations in the south-west Indian Ocean indicate the importance of the Chagos Archipelago
Estimates of marine turtle nesting populations in the south-west Indian Ocean indicate the importance of the Chagos Archipelago Open
Global marine turtle population assessments highlight the importance of the south-west Indian Ocean region, despite data gaps for the Chagos Archipelago. The archipelago hosts nesting hawksbill Eretmochelys imbricata and green turtles Chel…
View article: Green turtle diet is dominated by seagrass in the Western Indian Ocean except amongst gravid females
Green turtle diet is dominated by seagrass in the Western Indian Ocean except amongst gravid females Open
Green turtles ( Chelonia mydas ) are key herbivores of tropical and subtropical neritic habitats and play a major role in structuring seagrass meadows. We present the first detailed assessment of green turtle diet in the Western Indian Oce…
View article: A Field Key to the Developmental Stages of Marine Turtles (Cheloniidae) with Notes on the Development of<i>Dermochelys</i>
A Field Key to the Developmental Stages of Marine Turtles (Cheloniidae) with Notes on the Development of<i>Dermochelys</i> Open
Descriptions of the developmental stages of embryonic marine turtles are presented in the form of a dichotomous key supported by drawings to facilitate identifying stages of development in the field. The key emphasizes the sequential appea…
View article: How numbers of nesting sea turtles can be overestimated by nearly a factor of two
How numbers of nesting sea turtles can be overestimated by nearly a factor of two Open
Estimating the absolute number of individuals in populations and their fecundity is central to understanding the ecosystem role of species and their population dynamics as well as allowing informed conservation management for endangered sp…
View article: Supplementary material from "How numbers of nesting sea turtles can be overestimated by nearly a factor of two"
Supplementary material from "How numbers of nesting sea turtles can be overestimated by nearly a factor of two" Open
Estimating the absolute number of individuals in populations and their fecundity is central to understanding the ecosystem role of species and their population dynamics as well as allowing informed conservation management for endangered sp…
View article: Are we working towards global research priorities for management and conservation of sea turtles?
Are we working towards global research priorities for management and conservation of sea turtles? Open
In 2010, an international group of 35 sea turtle researchers refined an initial list of more than 200 research questions into 20 metaquestions that were considered key for management and conservation of sea turtles. These were classified u…