Life Stages, Anthropogenic Impact, and Temporal Variation of Stranded Sea Turtles in Southern Brazil

Scherer, Angelo Luís; Valls, Fernanda Caminha Leal; Basler, Aparecida Brusamarello; Scherer, Janete de Fátima Martins; Petry, Maria Virgı́nia

doi:10.2744/ccb-1029.1

Cited by 6 publications

(10 citation statements)

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“…It is important that satellite telemetry studies in these rookeries, as well as in Cyprus, should aim to include male turtles. In addition, localized empirical studies using aerial surveys (Cardona et al, 2005), monitoring coastlines for stranded turtles (Scherer et al, 2014) and surveys in fisheries (Carman et al, 2011) could further delimit important foraging habitats and their demographics. Secondly, the value of tracking studies could be amplified using predictive habitat models that incorporate remotely sensed environmental data (Jonsen et al, 2007;Pikesley et al, 2013;Hacohen-Domen e et al, 2015).…”

Section: Prioritizing Researchmentioning

confidence: 99%

“…Secondly, the value of tracking studies could be amplified using predictive habitat models that incorporate remotely sensed environmental data (Jonsen et al, 2007;Pikesley et al, 2013;Hacohen-Domen e et al, 2015). In addition, localized empirical studies using aerial surveys (Cardona et al, 2005), monitoring coastlines for stranded turtles (Scherer et al, 2014) and surveys in fisheries (Carman et al, 2011) could further delimit important foraging habitats and their demographics. Thirdly, more detailed small-scale fisheries characterization studies are required to break down marine turtle bycatch not only by gear type, but also with descriptions of individual deployment characteristics, summarizing temporal and spatial variability in deployments of specific gear-target catch combinations.…”

Section: Prioritizing Researchmentioning

confidence: 99%

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Shelf life: neritic habitat use of a turtle population highly threatened by fisheries

Snape

Broderick

Çiçek

et al. 2016

Diversity and Distributions

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Aim It is difficult to mitigate threats to marine vertebrates until their habitat use is understood. We report on a decade of satellite tracking loggerhead turtles (Caretta caretta) from an important nesting site to determine priority habitats for their protection in a region where they are known to be heavily impacted by fisheries.Location Cyprus, Eastern Mediterranean. Method We tracked 27 adult female loggerheads between 2001 and 2012 from North Cyprus nesting beaches. To eliminate potential biases, we included females nesting on all coasts of our study area, at different periods of the nesting season and from a range of size classes.Results Foraging sites were distributed over the continental shelf of Cyprus, the Levant and North Africa, up to a maximum distance of 2100 km from nesting sites. Foraging sites were clustered in (1) near-shore waters of Cyprus and Syria, (2) offshore waters of Egypt and (3) offshore and near-shore regions of Libya and Tunisia. The North Cyprus and west Egypt/east Libyan coasts are important areas for loggerhead turtles during migration. Movement patterns within foraging sites strongly suggest benthic feeding in discrete areas. Early nesters visited other rookeries in Turkey, Syria and Israel where they likely laid further clutches. Tracking suggests minimum annual mortality of 11%, comparable to other fishery-impacted loggerhead populations.Main conclusions This work further highlights the importance of neritic habitats of Libya and Tunisia as areas likely used by loggerhead turtles from many of the Mediterranean rookeries and where the threat of fisheries bycatch is high. Our tracking data also suggest that anthropogenic mortalities may have occurred in North Cyprus, Syria and Egypt; all within near-shore marine areas where small-scale fisheries operate. Protection of this species across many geopolitical units is a major challenge and documenting their distribution is an important first step.

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Section: Prioritizing Researchmentioning

confidence: 99%

Section: Prioritizing Researchmentioning

confidence: 99%

Shelf life: neritic habitat use of a turtle population highly threatened by fisheries

Snape

Broderick

Çiçek

et al. 2016

Diversity and Distributions

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“…However it has been shown that the analysis of stranding data over wide spatio-temporal ranges can provide insight into disease, geographic ranges, seasonal distribution and life history of both the local and larger population (Balazs, 1991;Herbst, 1994;Scherer et al, 2014).…”

Section: Diseasesmentioning

confidence: 99%

“…The long-term study of stranded animals can provide important information about potential trends for at-sea threats (anthropogenic and natural), diseases (Balazs, 1991;Herbst, 1994;Lloyd and Ross, 2015;Scherer et al, 2014), geographic ranges, seasonal distribution and life history (McFee et al, 2006;Scherer et al, 2014). Long term stranding monitoring programs assess the impact of implemented management actions (Scherer et al, 2014).…”

Section: Flood Plumesmentioning

confidence: 99%

“…Long term stranding monitoring programs assess the impact of implemented management actions (Scherer et al, 2014). Due to the fact that the monitoring of marine vertebrates including turtles at sea can be expensive, the use of strandings can be an effective ancillary tool to provide minimum counts of at sea mortality and threats (Peltier et al, 2012).…”

Section: Flood Plumesmentioning

confidence: 99%

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The effectiveness of rehabilitation post catastrophic environmental events as a conservation strategy for marine turtles

Flint¹

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School of Veterinary Science 2In-water monitoring of the health and well-being of marine vertebrates is usually expensive and therefore may not be undertaken by management agencies with financial constraints.However, the use of stranding data can provide a cost-effective alternative estimation of disease and mortality. Strandings for marine turtles in Queensland are recorded in a web based database (StrandNet) managed by the Queensland Government's Department of Environment and Heritage Protection (EHP). Data recorded in StrandNet for marine turtles stranded from the entire east coast of Queensland between 1996 and 2013 were investigated for patterns of stranding in an attempt to identify which factors, such as extreme weather events, may cause stranding of marine turtle species and, further, use these patterns to predict stranding and the required responses to mitigate the negative impact mass mortalities have on endangered species such as marine turtles.Significant stranding trends in Queensland between 1996-2013 were: (i) an increase in the number of animals reported stranded within the study site; (ii) a species (loggerhead and green marine turtles) prevalence for stranding; (iii) a seasonal effect on different age classes stranding with most overall strandings occurring between August and November; and (iv) stranding hotspots (Moreton Bay, Hervey Bay, Rockhampton region and Cleveland Bay) persisting throughout the study timeframe.One strategy to mitigate the negative effects of marine turtle stranding is to provide medical care to those that strand alive in the hopes they can return to the functional population. Rehabilitation of marine turtles in Queensland is multifaceted. It treats individual animals, serves to educate the public, and contributes to conservation. Of 13854 marine turtles reported as stranded during the 18-year period of investigation, 5022 of these turtles stranded alive with the remainder verified as dead or of unknown condition. A total of 2970 (59%) of these live strandings were transported to a rehabilitation facility.The original cause of stranding has an impact on the success of rehabilitation and this may influence where treatment efforts are directed. For example, of the turtles admitted to rehabilitation exhibiting signs of disease (natural cause of illness) (18% of all animals admitted to rehabilitation), 88% of them died either unassisted or by euthanasia. Sixty-six percent of turtles admitted for unknown causes of stranding died either unassisted or by 3 euthanasia. By contrast, all turtles recorded as having a buoyancy disorder with no other presenting problem or disorder recorded, were released alive.One hundred and one of the turtles released from rehabilitation were reencountered: 77 reported as restrandings (20 dead, 13 alive subsequently died, 11 alive subsequently euthanized, 33 alive) and 24 recaptured during normal marine turtle population monitoring or fishing activities. Considering the high mortality rate and low successful recapture rate, rehabilitation may not be...

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Validating the use of stereo‐video cameras to conduct remote measurements of sea turtles

Siegfried

Fuentes

Ware

et al. 2021

Ecology and Evolution

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Life Stages, Anthropogenic Impact, and Temporal Variation of Stranded Sea Turtles in Southern Brazil

Cited by 6 publications

References 13 publications

Shelf life: neritic habitat use of a turtle population highly threatened by fisheries

Shelf life: neritic habitat use of a turtle population highly threatened by fisheries

The effectiveness of rehabilitation post catastrophic environmental events as a conservation strategy for marine turtles

Validating the use of stereo‐video cameras to conduct remote measurements of sea turtles

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