Evidence of migratory movements of olive ridley turtles (Lepidochelys olivacea) along the Brazilian coast

Reis, Estéfane Cardinot; Moura, Jailson Fulgêncio de; Lima, Luciano Moreira; Rennó, Bruno; Siciliano, Salvatore

doi:10.1590/s1679-87592010000300009

Cited by 13 publications

(13 citation statements)

References 21 publications

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“…This contrasts with the long-distance movements suggested from tag recovery for the above-mentioned single female observed from northern Brazil (Reis et al 2010). Our results also contrast with most studies conducted on other olive ridley populations where females display exclusively long-distance movements, traveling up to several thousands of kilometers away from the nesting beach, either in the oceanic (Plotkin 2003, 2010, Polovina et al 2004, Pikesley et al 2013 or in the mixed neritic−oceanic domain (McMahon et al 2007).…”

Section: Migration Dispersalcontrasting

confidence: 99%

“…As far as the western Atlantic Ocean is concerned, only 1 occurrence of post-nesting migration movements has been documented for olive ridley turtles through flipper tag returns of a single female nesting in Brazil (Reis et al 2010). In the present study, we investigated the post-nesting migration of 7 satellitetracked olive ridley females from French Guiana and described their dispersal and diving behavior in relation to the environment they exploited.…”

Section: Discussionmentioning

confidence: 94%

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Dispersal and dive patterns during the post-nesting migration of olive ridley turtles from French Guiana

Plot¹,

Thoisy²,

Georges³

2015

Endang. Species. Res.

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Behavioral plasticity allows migrating animals to adjust their migration patterns in relation to the environmental conditions they encounter during their movements. Sea turtles display long post-nesting migrations which vary considerably between species and populations. To date, there has been no description of migratory patterns of the large population of olive ridley turtles Lepidochelys olivacea in the west Atlantic. Here, we investigated dispersal and dive patterns in relation to environmental conditions of 7 satellite-tracked olive ridley females from French Guiana during their post-nesting migration. After they left the nesting beach, turtles followed a consistent northwestward direction and then remained in the restricted yet productive neritic domain of the continental shelf of French Guiana and Suriname. Despite this restricted dispersal range, turtles demonstrated variability in the habitats they exploited, i.e. the coastline, the continental shelf, and the continental slope, illustrating some plasticity. Moreover, turtles showed 2 different foraging strategies, either directly reaching a specific foraging area off river mouths, or meandering over the neritic area exploiting several foraging areas. In addition, turtles showed different dive patterns related to their habitat, although mostly exploiting the seabed by routinely performing U-shaped benthic dives. Overall, turtles vertically exploited non-stratified water masses characterized by warm surface temperatures consistent with their preferential thermal habitat. The migration strategy used by olive ridleys from French Guiana raises conservation concerns, since turtles may be exposed to coastal human-induced activities that must be considered in the implementation of accurate management measures for this still poorly studied population.

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Section: Migration Dispersalcontrasting

confidence: 99%

Section: Discussionmentioning

confidence: 94%

Dispersal and dive patterns during the post-nesting migration of olive ridley turtles from French Guiana

Plot¹,

Thoisy²,

Georges³

2015

Endang. Species. Res.

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“…Relatively high numbers of strandings of L. olivacea were recorded, mainly subadults/adults, corroborating other studies on the north coast of Rio de Janeiro (Reis, Silveira, et al, ; Reis et al, ; Reis, Moura, Lima, et al, ). The main feeding and nesting sites of L. olivacea in the south‐west Atlantic are concentrated in the north and north‐east regions of Brazil (Castilhos et al, ; Marcovaldi, ; Silva et al, ).…”

Section: Discussionsupporting

confidence: 89%

“…However, there are also bycatch records of this species in the south‐south‐east regions (Guimarães, Tavares, & Monteiro‐Neto, ; Pinedo & Polacheck, ; Sales, Giffoni, & Barata, ), as well as stranding records along much of the Brazilian coast, from Ceará (Lima et al, ) to the southernmost part of the country, where they are less frequent (Monteiro et al, ). Reis, Moura, Lima, et al () also reported a female L. olivacea in the region of Quissamã that had been tagged during nesting in Sergipe. Thus, based on the evidence, some adult L. olivacea migrate from the north‐north‐east of Brazil to the coast of Rio de Janeiro, using the region as a feeding area, as suggested previously by Reis, Moura, Lima, et al ().…”

Section: Discussionmentioning

confidence: 95%

Spatio‐temporal distribution of sea turtle strandings and factors contributing to their mortality in south‐eastern Brazil

Tagliolatto

Goldberg

Godfrey

et al. 2019

Aquatic Conservation

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Data on stranded sea turtles were examined between 2010 and 2016 along the northern region of Rio de Janeiro state and between 2016 and 2017 in the southern region, looking for spatio‐temporal patterns and determining which factors contributed to their mortality. A total of 12,162 strandings of all five species that occur in Brazil were recorded, with Chelonia mydas being the most common (89.9%). Sea turtles use the Rio de Janeiro coast as a feeding and/or migration area. The intense upwelling (October to April) may be an important factor for the sea turtles feeding in this region, mainly for Eretmochelys imbricata and Dermochelys coriacea, which had a higher number of strandings during this period. Areas further north of the study area include an important nesting site for Caretta caretta in Brazil, which explains the higher concentration of strandings of subadults/adults of this species in this region and during its nesting season. Many anthropogenic threats to sea turtles were documented, mainly incidental capture in fisheries and marine debris, indicating possible hotspots for these threats in the regions of Sepetiba and Guanabara Bays, Cabo Frio, and São Francisco de Itabapoana. Among the natural causes of strandings, the primary factors were chronic illness, endoparasites, and fibropapillomatosis. However, pollution may also be an indirect threat, which negatively affects these animals through reduced health and immunosuppression, leaving them more susceptible to opportunistic diseases. These data are valuable for directing and implementing specific and local mitigation measures along the Rio de Janeiro state coast, such as avoiding bycatch hotspots through fleet communication programmes and/or area and seasonal closures, enforceable legislation, effective penalties and proper waste management.

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“…Telemetry studies for olive ridley turtles in Brazil highlight that there is a displacement from the Espírito Santo coast to Pará State (Castilhos et al, 2011). Beyond telemetry studies, analysis of strandings along the Brazilian coast indicates that turtles could be migrating to more southern feeding areas, such as in the study of Reis et al (2010a), which suggests that feeding areas for olive ridley turtles are found on the Rio de Janeiro coast. Considering this large home range, and all the natural and anthropogenic risks to which these animals are exposed, it is very plausible that they were stranded during migration from their nesting area to different foraging grounds.…”

Section: Discussionmentioning

confidence: 99%

Patterns and inferred processes associated with sea turtle strandings in Paraíba State, Northeast Brazil

et al. 2014

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This study analysed sea turtle strandings on the coast of Paraíba State, Northeastern Brazil, from August 2009 to July 2010. A total of 124 strandings were recorded in this period: green turtle Chelonia mydas (n = 106), hawksbill Eretmochelys imbricata (n = 15), olive ridley Lepidochelys olivacea (n = 2) and loggerhead Caretta caretta (n = 1). Of all turtles for which the Curved Carapace Length (CCL) was measured (n = 122), only 12 individuals (9.7%) were adults. Twenty individuals had synthetic anthropogenic debris in the gastrointestinal tract. Other traces of human interactions were observed in 43 individuals, such as injuries caused by entanglement in fishing lines or nets, collisions with vessels, direct contact with oil spills and lesions caused by sharp or spiked objects. Moreover, in 28.5% of the stranded turtles, the presence of external tumors was noticed, suggestive of fibropapillomatosis and in 9.7%, shark bite marks were observed. Of the 107 individuals that were sexed, 76 were females and 31 were males. Most turtles (72.6%) became stranded during the spring/summer (between October and March). We found evidence of human interactions (injuries) in half of the strandings, but in most cases it was not possible to determine if such interactions were the cause of death. A logistic regression found a significant relationship between CCL, ingestion of debris and lesions caused by sharks or spiked objects. Systematic data collection from stranded sea turtles can provide useful biological information, such as seasonal and spatial patterns in their occurrence and mortality, age structure, sex ratio and diet, as well as possible mortality causes.Keywords: threatened species, human impact, beach strandings, green sea turtle. Padrões e inferências associadas com encalhes de tartarugas marinhas no Estado da Paraíba, Nordeste do Brasil ResumoEste estudo analisou encalhes de tartarugas marinhas na costa do Estado da Paraíba, Nordeste do Brasil, de agosto de 2009 a julho de 2010. Neste período, 124 encalhes foram registrados: tartaruga-verde Chelonia mydas (n = 106), tartaruga-de-pente Eretmochelys imbricata (n = 15), tartaruga-oliva Lepidochelys olivacea (n = 2) e cabeçuda Caretta caretta (n = 1). Dentre todas as tartarugas que tiveram o Comprimento Curvilíneo da Carapaça (CCC) medido (n = 122), apenas 12 indivíduos (9,7%) foram considerados adultos. Vinte indivíduos tinham detritos antropogênicos sintéticos no trato gastrointestinal. Em 43 indivíduos, outros vestígios de interações humanas foram observados, tais como lesões causadas por emaranhamento em linhas ou redes de pesca, colisões com embarcações, contato direto com derramamentos de óleo e lesões causadas por objetos perfurocortantes. Além disso, em 28,5% das tartarugas encalhadas, foi observada a presença de tumores externos sugestivos de fibropapilomatose e em 9,7%, foram observadas marcas de mordidas de tubarão. Dos 107 indivíduos sexados, 76 eram fêmeas e 31 eram machos. A maioria das tartarugas (72,6%) encalhou durante a primavera/verão (entre ...

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Evidence of migratory movements of olive ridley turtles (Lepidochelys olivacea) along the Brazilian coast

Cited by 13 publications

References 21 publications

Dispersal and dive patterns during the post-nesting migration of olive ridley turtles from French Guiana

Dispersal and dive patterns during the post-nesting migration of olive ridley turtles from French Guiana

Spatio‐temporal distribution of sea turtle strandings and factors contributing to their mortality in south‐eastern Brazil

Patterns and inferred processes associated with sea turtle strandings in Paraíba State, Northeast Brazil

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