Fishery strategy affects the loggerhead sea turtle mortality trend due to the longline bycatch

Báez, José C.; García-Barcelona, Salvador; Camiñas, Juan Antonio; Macías, David

doi:10.1016/j.fishres.2018.11.032

Cited by 14 publications

(12 citation statements)

References 18 publications

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“…This species is still experiencing the heaviest mortality record. On the western Mediterranean Sea, the situation continues to be worrying, despite efforts to modernize fishing on the Spanish coast to reduce interaction with sea turtles during the last 10 years (Báez et al 2019). In Algeria, the situation is still unclear as there is no study on this interaction, and most of the fishing gear is still artisanal, while most of C. caretta, which had interaction with fisheries in this study, were caught by set or drift net.…”

Section: Caretta Carettamentioning

confidence: 76%

First study of sea turtle strandings in Algeria (western Mediterranean) and associated threats: 2016–2017

Belmahi¹,

Belmahi²,

Benabdi³

et al. 2020

Herpetozoa

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Between December 2015 and December 2017 a total of 63 sea turtles were recorded as being stranded along the Algerian coast. The loggerhead sea turtle Caretta caretta was the most commonly stranded species (n = 44) (69.8%), followed by the leatherback Dermochelys coriacea (n = 18) (28.6%) and the green turtle Chelonia mydas (n = 1). There was a slight dominance of the adult size class for stranded loggerhead turtles, while, for the leatherback, late juveniles and adults prevailed. Most loggerhead turtles stranded during the summer months (July and August), whereas most leatherbacks stranded during winter. The breakdown of the strandings by region shows a slight dominance along the western and central shores for C. caretta and a clear dominance in the west for D. coriacea. The primary cause of death was determined in 50.8% of the stranded turtles. Regarding the evidence of interactions with humans the major cause of stranding in loggerhead turtles was incidental catch by artisanal fisheries, followed by boats’ collisions. The main causes of leatherback strandings were boats’ collisions. Algerian data show that human activities affect loggerhead turtles and also prove a significant presence of the leatherback turtle on this coast.

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Section: Caretta Carettamentioning

confidence: 76%

First study of sea turtle strandings in Algeria (western Mediterranean) and associated threats: 2016–2017

Belmahi¹,

Belmahi²,

Benabdi³

et al. 2020

Herpetozoa

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“…As explained in Canary Islands, Spain, fishing is associated with net entanglement and hook and monofilament line ingestion which lead to death [ 52 ]. Implementing changes in fishing strategies, operations and technologies have shown to reduce the mortality rates associated with fishing worldwide [ 103 , 104 ]. An example is using turtle exclusion devices (TED) to be able to release sea turtles from trawls [ 103 ].…”

Section: Resultsmentioning

confidence: 99%

Disease risk analysis in sea turtles: A baseline study to inform conservation efforts

et al. 2020

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The impact of a range of different threats has resulted in the listing of six out of seven sea turtle species on the IUCN Red List of endangered species. Disease risk analysis (DRA) tools are designed to provide objective, repeatable and documented assessment of the disease risks for a population and measures to reduce these risks through management options. To the best of our knowledge, DRAs have not previously been published for sea turtles, although disease is reported to contribute to sea turtle population decline. Here, a comprehensive list of health hazards is provided for all seven species of sea turtles. The possible risk these hazards pose to the health of sea turtles were assessed and “One Health” aspects of interacting with sea turtles were also investigated. The risk assessment was undertaken in collaboration with more than 30 experts in the field including veterinarians, microbiologists, social scientists, epidemiologists and stakeholders, in the form of two international workshops and one local workshop. The general finding of the DRA was the distinct lack of knowledge regarding a link between the presence of pathogens and diseases manifestation in sea turtles. A higher rate of disease in immunocompromised individuals was repeatedly reported and a possible link between immunosuppression and environmental contaminants as a result of anthropogenic influences was suggested. Society based conservation initiatives and as a result the cultural and social aspect of interacting with sea turtles appeared to need more attention and research. A risk management workshop was carried out to acquire the insights of local policy makers about management options for the risks relevant to Queensland and the options were evaluated considering their feasibility and effectiveness. The sea turtle DRA presented here, is a structured guide for future risk assessments to be used in specific scenarios such as translocation and head-starting programs.

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“…Notably large numbers of capture events (~20,000) have been also recorded in Spain, at the Western Mediterranean and at the Aegean Sea, at the Eastern part of the basin [12]. Recent studies revealed an extensive effect of fishing activities on sea turtles that are located at Spanish waters [31] while increased frequency of interactions between fishermen and sea turtles have been observed both in Greece [32] and Turkey [33], with all of the above-mentioned regions being identified as the most exposed to risk due to fisheries. The ecoregions of Tunisian Plateau/Gulf of Sidra and Levantine Sea were found to be under lower risk due to fisheries; still, poor data coverage for countries at northern African coasts and Western Asia [24] could have resulted in downgrading the problem at these regions and thus, we recommend that these results should be interpreted with caution.…”

Section: Discussionmentioning

confidence: 99%

Investigating the Distribution of Foraging Habitat for Loggerhead Sea Turtles, Caretta caretta, in the Mediterranean Sea

Almpanidou

Chatzimentor

Tsapalou

et al. 2021

The 1st International Electronic Conference on Biological Diversity, Ecology and Evolution

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A better understanding on the distribution of highly migratory marine megafauna and the potential exposure of their habitats to anthropogenic activities is essential for their effective protection. Here, we deliver a comprehensive view on the distribution of foraging grounds for the representatives of marine megafauna, loggerheads, Caretta caretta, in the Mediterranean Sea, along with an assessment on their exposure to fisheries. Using the available published satellite tracking information on the adult Mediterranean foraging loggerheads, we built a series of distribution models to develop a map of the foraging grounds across the basin. We also assessed the exposure of the delineated foraging grounds to the cumulative risk due to different types of fisheries. Our findings revealed that the foraging grounds of adult loggerheads extended over the 9% of the Mediterranean Sea. We identified well-established areas in the central Mediterranean Sea but also sites, at the western part, for which the current knowledge was restricted. The exposure of the foraging grounds to fisheries differed across the basin, with the Adriatic Sea being under the highest level of risk. The developed approach, combining modeling techniques and risk assessment, allowed to reveal critical sites for loggerheads on which conservation actions should focus.

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Fishery strategy affects the loggerhead sea turtle mortality trend due to the longline bycatch

Cited by 14 publications

References 18 publications

First study of sea turtle strandings in Algeria (western Mediterranean) and associated threats: 2016–2017

First study of sea turtle strandings in Algeria (western Mediterranean) and associated threats: 2016–2017

Disease risk analysis in sea turtles: A baseline study to inform conservation efforts

Investigating the Distribution of Foraging Habitat for Loggerhead Sea Turtles, Caretta caretta, in the Mediterranean Sea

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