Corozalito: a nascent arribada nesting beach in Costa Rica

Rojas-Cañizales, Daniela; Mejías-Balsalobre, Carmen; Espinoza-Rodríguez, Nínive; Bézy, Vanessa S.; Naranjo, Isabel; Arauz, Rándall; Valverde, Roldán A.

doi:10.1007/s00227-022-04039-6

Cited by 7 publications

(8 citation statements)

References 36 publications

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“…To this point, no one has ever documented the natural evolution of an arribada rookery. Interestingly, Corozalito, a small arribada beach recently discovered just south of Ostional beach (Rojas‐Cañizales et al, 2022; Viejobueno et al, 2011), is relatively rapidly becoming established as a sizeable arribada rookery. A key aspect revealed by research conducted at that rookery is that arribada populations in Costa Rica are not closed systems and that there exists significant movement of nesting females up and down the coast (Rojas‐Cañizales et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

“…Interestingly, Corozalito, a small arribada beach recently discovered just south of Ostional beach (Rojas‐Cañizales et al, 2022; Viejobueno et al, 2011), is relatively rapidly becoming established as a sizeable arribada rookery. A key aspect revealed by research conducted at that rookery is that arribada populations in Costa Rica are not closed systems and that there exists significant movement of nesting females up and down the coast (Rojas‐Cañizales et al, 2022). Thus, it may be that females born at Nancite in the previous five decades are now nesting at Corozalito and Ostional, and elsewhere in the region.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…Vertical dashed lines represent breaks in the time line. Means with non-overlapping confidence intervals are significantly different.there exists significant movement of nesting females up and down the coast(Rojas-Cañizales et al, 2022). Thus, it may be that females born at Nancite in the previous five decades are now nesting at Corozalito and Ostional, and elsewhere in the region.…”

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confidence: 97%

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Reassessment of the olive ridley sea turtle Lepidochelys olivacea nesting population at Nancite Beach, Costa Rica

Fonseca,

Villachica,

Rangel

et al. 2023

Marine Ecology

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Nancite is a fully protected beach within the Guanacaste Conservation Area, Costa Rica where olive ridley (Lepidochelys olivacea) sea turtles nest in synchronous mass‐nesting events known as arribadas. Arribadas decreased in magnitude at this beach by approximately 90% during the period 1971–2007 due to unknown causes. The total count estimate of females nesting in a year also decreased over these decades. In the present study, from August 2009 to February 2021, the trend of arribada nesting female abundance and estimated annual production of hatchlings were assessed and compared with previous trend analyses. A total of 62 mass‐nesting events were quantified in the period 2009–2021, with an estimated annual average of 64,694 nesting females. Trend analysis indicated that during our recent study period, the number of females per arribada event increased by an estimated 14% (8%, 20% CI95%). During this period, a mean hatching rate of 33.4% was estimated, corresponding to an overall estimated production average of 2,165,597 per season, which represented an increase of 82.7% compared with a previous estimate for the period 1980–1984, when the arribadas were larger. We suggest that the growth in hatchling production over the past four decades is at least in part responsible for the slight increase in the estimated size of arribadas since 2009/2010. However, because maximal hatching success did not increase above 60%, the beach may be close to reaching carrying capacity, and it seems that high hatchling production may soon level off or begin to decrease. Thus, it is not clear whether current hatchling production will lead to the recovery of the Nancite population to the historical levels documented in the 1970s and early 1980s.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 97%

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Reassessment of the olive ridley sea turtle Lepidochelys olivacea nesting population at Nancite Beach, Costa Rica

Fonseca,

Villachica,

Rangel

et al. 2023

Marine Ecology

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“…Hackradt (2005) also reported the predation of nests and hatchlings by Cerdocyon thous (Canidae) and C. l. familiaris on beaches of the state of Sergipe in northeast Brazil. In other countries, the impact of domestic and wild animals has also been reported on sea turtles (Margaritoulis et al ., 2019; Rojas-Cañizales et al ., 2022), considering various land predators such as jackals (Peters et al ., 1994), jaguars (Alfaro et al ., 2016; Escobar-Lasso et al ., 2017), and coyotes (Drake et al ., 2003). Considering the scarcity of information on this topic, the aim of the present study was to report events of canid attacks on sea turtles in northeastern Brazil to assist in the establishment of possible prevention and emergency measures for the conservation of chelonians.…”

Section: Introductionmentioning

confidence: 99%

Canid attacks on sea turtles along the Northeastern Brazilian Coast

Almeida,

Messenger,

Gomes

et al. 2024

J. Mar. Biol. Ass.

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The aim of the present study was to report canid attacks on sea turtles in northeastern Brazil. The study was conducted on the Sergipe-Alagoas Basin coastline between March 2010 and October 2019. Injured-stranded sea turtles or carcasses were recorded through systematic beach monitoring. The specimens were submitted for clinical or postmortem assessments, providing evidence for the identification of injuries caused by canids. In the study period, 9841 stranded sea turtles were recorded, with the diagnosis of canid attacks in 55 (0.55%) events. Lepidochelys olivacea was the species with the largest number of events (90.90%), followed by Chelonia mydas (7.27%), and Caretta caretta (1.81%). The attacked sea turtles were clinically healthy, with a good body score and no apparent diseases; most were in the reproductive stage. The injuries were mainly found on the front flippers, with considerable loss of musculature affecting the brachial plexus, with the rupture of large blood vessels, and in some cases, exposure of the humerus or oesophagus. Thus, these events hampered the reproductive cycle, limiting the egg-laying process and preventing the hatching of hundreds of new turtles. Therefore, mitigating measures should be implemented, addressing the consequences of abandoning pets and their unsupervised presence on beaches.

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Influence of incubation temperature, maternal effects, and paternity on quality of olive ridley hatchlings (Lepidochelys olivacea) from a mass‐nesting beach in the Mexican Pacific

Labastida‐Estrada,

González‐Cortés,

Karam‐Martínez

et al. 2024

J Exp Zool Pt A

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Future climate change scenarios project that the increase in surface temperatures will affect ocean temperatures, inducing shifts in marine biodiversity. Sea turtles are species that are particularly vulnerable to the effects of climate change because temperature is a factor that influences embryonic development. We collected clutches of olive ridley turtles from a mass‐nesting beach in the Mexican Pacific, which were incubated in ex situ conditions. When the hatchlings emerged, we measured the body condition index—which evaluates the weight‐length relationship—and swim thrust, both were considered traits associated with fitness, termed “fitness proxies,” and evaluated the effects of incubation temperature, maternal effects, and paternity on these fitness proxies. The body condition index was correlated positively and significantly with the arribada month and temperature during the last third of the incubation period but showed an inverse relationship with the maternal effect. While swim thrust was positively correlated with the maternal effect and the arribada month, there was an inverse relationship with incubation temperature during the first third of the period. Paternity, whether single or multiple, did not have a significant effect on either fitness proxies; however, it may have effects on the average fitness of a population of hatchlings. These results underscore the need to expand research on the sublethal effects of high incubation temperatures on the adaptation and survival of sea turtles, particularly in scenarios of rapid climate change.

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Corozalito: a nascent arribada nesting beach in Costa Rica

Cited by 7 publications

References 36 publications

Reassessment of the olive ridley sea turtle Lepidochelys olivacea nesting population at Nancite Beach, Costa Rica

Reassessment of the olive ridley sea turtle Lepidochelys olivacea nesting population at Nancite Beach, Costa Rica

Canid attacks on sea turtles along the Northeastern Brazilian Coast

Influence of incubation temperature, maternal effects, and paternity on quality of olive ridley hatchlings (Lepidochelys olivacea) from a mass‐nesting beach in the Mexican Pacific

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