Olive ridley (Lepidochelys olivacea) laying eggs habitat mapping in Penimbangan Beach, Bali Island

Penimbangan beach is one of the tourist destinations located in Buleleng Regency, Bali Province, Indonesia. This beach is also a nesting place for one of the sea turtle species in Indonesia, which is olive ridley (Lepidochelys olivacea). The problem that exists on the island of Bali today is most of the land in coastal areas were experienced land degradation. This land degradation occurs due to human activities or natural factors, it harms the turtle nesting habitat around the coastal area of Bali Island. Conservation of nesting turtle habitat is needed through spatial analysis using Geographic Information Systems (GIS). This study uses the parameters of sand particle, beach slope, width beach, humidity, and temperature parameter to determine the suitability of the turtle nesting habitat. Penimbangan beach area which is very suitable for turtle nesting locations has an area of 163,45 m2, suitable for laying eggs 4.886,44 m2, and not suitable for laying eggs 10.201,64 m2. The map of the suitability for laying turtle eggs is dominated by areas that are not suitable because the width of the beach is not too long and the humidity is still relatively high.

Plesiochorus cymbiformis (Rudolphi, 1819) Looss, 1901 (Digenea: Gorgoderidae) in Olive Ridley Sea turtles Lepidochelys olivacea (Eschscholtz, 1829) (Testudines: Chelonidae) from the Brazilian coast: New geographic occurrence and associated injuries

Summary The present study reports the first occurrence of Plesiochorus cymbiformis (Digenea: Gorgoderidae), in two Olive Ridley Sea turtles Lepidochelys olivacea (Testudines: Chelonidae), from the states of São Paulo and Sergipe in Brazilian coast. Concerning the Neotropical region, P. cymbiformis has been previously reported in green sea turtles (Chelonia mydas) from Panama and Brazil, in loggerhead sea turtles (Caretta caretta) from Brazil, in hawksbill sea turtles (Eretmochelys imbricata) from Puerto Rico, and in Olive Ridley Sea turtles only in Costa Rica. Lesions resulting from the presence of parasites in the hosts’ urinary bladders are also presented. This is the second report on endoparasites in Olive Ridley sea turtles from Brazil.

Occurrence and diet analysis of sea turtles in Korean shore

Background Sea turtles, which are globally endangered species, have been stranded and found as bycatch on the Korean shore recently. More studies on sea turtles in Korea are necessary to aid their conservation. To investigate the spatio-temporal occurrence patterns of sea turtles on the Korean shore, we recorded sampling locations and dates, identified species and sexes and measured sizes (maximum curved carapace length; CCL) of collected sea turtles from the year 2014 to 2020. For an analysis of diets through stomach contents, we identified the morphology of the remaining food and extracted DNA, followed by amplification, cloning, and sequencing. Results A total of 62 stranded or bycaught sea turtle samples were collected from the Korean shores during the study period. There were 36 loggerhead turtles, which were the dominant species, followed by 19 green turtles, three hawksbill turtles, two olive ridley turtles, and two leatherback turtles. The highest numbers were collected in the year 2017 and during summer among the seasons. In terms of locations, most sea turtles were collected from the East Sea, especially from Pohang. Comparing the sizes of collected sea turtles according to species, the average CCL of loggerhead turtles was 79.8 cm, of green turtles was 73.5 cm, and of the relatively large leatherback turtle species was 126.2 cm. In most species, the proportion of females was higher than that of males and juveniles, and was more than 70% across all the species. Food remains were morphologically identified from 19 stomachs, mainly at class level. Seaweeds were abundant in stomachs of green turtles, and Bivalvia was the most detected food item in loggerhead turtles. Based on DNA analysis, food items from a total of 26 stomachs were identified to the species or genus level. The gulfweed, Sargassum thunbergii, and the kelp species, Saccharina japonica, were frequently detected from the stomachs of green turtles and the jellyfish, Cyanea nozakii, the swimming crab, Portunus trituberculatus, and kelps had high frequencies of occurrences in loggerhead turtles. Conclusions Our findings support those of previous studies suggesting that sea turtles are steadily appearing in the Korean sea. In addition, we verified that fish and seaweed, which inhabit the Korean sea, are frequently detected in the stomach of sea turtles. Accordingly, there is a possibility that sea turtles use the Korean sea as feeding grounds and habitats. These results can serve as basic data for the conservation of globally endangered sea turtles.

Regional Ranking of Marine Turtle Nesting in Remote Western Australia by Integrating Traditional Ecological Knowledge and Remote Sensing

Western Australia’s remote Kimberley coastline spans multiple Traditional Owner estates. Marine turtle nesting distribution and abundance in Indigenous Protected Areas and newly declared Marine Parks were assessed by aerial photogrammetry surveys for the Austral summer and winter nesting seasons. Images of nesting tracks were quantified in the lab and verified by ad hoc ground patrols. The rankings of log-scaled plots of track abundance and density give guidance to regional co-management planning. Spatial and temporal differences were detected in that remoter islands had higher nesting usage and few terrestrial predators. The surveys found year-round green turtle nesting peaking in summer, as well as spatial boundaries to the summer and winter flatback stocks. Summer surveys recorded 126.2 island activities per km and 17.7 mainland activities per km. Winter surveys recorded 65.3 island activities per km and quantified a known winter mainland rookery with 888 tracks/km. The three highest density rookeries were found to be winter flatback turtles at Cape Domett, summer green turtles at the Lacepede Islands and summer flatback turtles at Eighty Mile Beach. Moderate to lesser density nesting by summer green turtles and winter flatback turtles occurred in the North Kimberley offshore islands. Traditional Ecological Knowledge and ground-based surveys verified the harder-to-detect species (olive ridley or hawksbill turtles) with irregular nesting, low track persistence and non-aggregated nesting. Higher-density rookeries may provide locations for long-term monitoring using repeated aerial or ground surveys; however, the sparse or infrequently nesting species require insights gleaned by Tradition Ecological Knowledge. Common and conspicuous nesters are easily detected and ranked, but better-informed co-management requires additional ground surveys or surveys timed with the reproductive peaks of rarer species.

Sustainable Community-run Development: Experiences from the ADIO Project in Ostional, Costa Rica

<p>In the face of the current global sustainability challenge, seeking out and strengthening sustainable alternative methods for community development has become an urgent task for development professionals and academics. In order to explore one of such alternatives, in this thesis I draw on research conducted with the Associación de Desarollo Integral de Ostional (ADIO). Located on Costa Rica’s rural Pacific coast, ADIO was initiated by the local community of Ostional and resulted in the Project of Sustainable Use, Conservation and Management of the Olive Ridley Sea Turtle in 1987. Co-managed by the University of Costa Rica (UCR) and the Ministry of Natural Resources (MINAE), ADIO practices conservation and scientifically monitors the management of the Olive Ridley sea turtle species. Surplus eggs from the turtle arribadas (the mass nesting’s of sea turtles) at the optional beach are being legally harvested and marketed by ADIO. This project has successfully contributed to the protection of the Olive Ridley turtle population whilst returning socio-economic benefits into the community. The aim of this research is to gain a better understanding of ADIO’s work and the significance of ADIO to the local community. My research draws on the experiences of community members to identify their perception of the benefits of ADIO to their own community, and unpack areas in need of improvement. Qualitative data were collected from community members through: semi structured interviews, participant observation, a reflective workshop, a questionnaire and field notes. The findings of this research identify key elements for the success of ADIO, and demonstrate the benefit of this Project toward the sustainability of the local community. This research demonstrates that socio-economic benefits can be gained through appropriate community participation in sustainable conservation projects, which can further enhance the desire of the local community to be better stewards of natural resources. This thesis seeks to contribute in some small way to an existing body of knowledge on the topics of sustainability, community-run conservation, and development.</p>

Sustainable Community-run Development: Experiences from the ADIO Project in Ostional, Costa Rica

<p>In the face of the current global sustainability challenge, seeking out and strengthening sustainable alternative methods for community development has become an urgent task for development professionals and academics. In order to explore one of such alternatives, in this thesis I draw on research conducted with the Associación de Desarollo Integral de Ostional (ADIO). Located on Costa Rica’s rural Pacific coast, ADIO was initiated by the local community of Ostional and resulted in the Project of Sustainable Use, Conservation and Management of the Olive Ridley Sea Turtle in 1987. Co-managed by the University of Costa Rica (UCR) and the Ministry of Natural Resources (MINAE), ADIO practices conservation and scientifically monitors the management of the Olive Ridley sea turtle species. Surplus eggs from the turtle arribadas (the mass nesting’s of sea turtles) at the optional beach are being legally harvested and marketed by ADIO. This project has successfully contributed to the protection of the Olive Ridley turtle population whilst returning socio-economic benefits into the community. The aim of this research is to gain a better understanding of ADIO’s work and the significance of ADIO to the local community. My research draws on the experiences of community members to identify their perception of the benefits of ADIO to their own community, and unpack areas in need of improvement. Qualitative data were collected from community members through: semi structured interviews, participant observation, a reflective workshop, a questionnaire and field notes. The findings of this research identify key elements for the success of ADIO, and demonstrate the benefit of this Project toward the sustainability of the local community. This research demonstrates that socio-economic benefits can be gained through appropriate community participation in sustainable conservation projects, which can further enhance the desire of the local community to be better stewards of natural resources. This thesis seeks to contribute in some small way to an existing body of knowledge on the topics of sustainability, community-run conservation, and development.</p>