NESTING ECOLOGY OF THE OLIVE RIDLEY SEA TURTLE (Lepidochelys olivacea) (CHELONIIDAE) AT EL VALLE BEACH, NORTHERN PACIFIC, COLOMBIA

Barrientos-Muñoz, Karla G.; Ramírez-Gallego, Cristian; Páez, Vivian P.

doi:10.15446/abc.v19n3.42457

Cited by 15 publications

(14 citation statements)

References 7 publications

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“…The overall hatching success in this study (42%) was low in comparison to that observed for olive ridley sea turtles at a solitary nesting beach (74–81%; [ 4 , 5 ]), yet comparable to previous studies at this and other mass nesting beaches [ 2 , 3 , 6 ]. However, hatching success was higher in all of our treatment plots (42%) in comparison to the area of the beach adjacent to the hatchery (nests not from this study, 27%; R. Valverde, pers.…”

Section: Discussionsupporting

confidence: 74%

“…This species of sea turtle is characterized by a nesting behavioral polymorphism, with some females nesting solitarily and others nesting in mass nesting events called arribadas [ 1 ]. Hatching success at mass nesting beaches is relatively low (0–32% vs. 74–81% at solitary beaches) and is therefore a concern for the sustainability of this natural phenomenon and the international conservation of the species [ 2 – 5 ]. Current data on the isolated effects of nest density (i.e., competition between developing embryos for respiratory gases and other resources) on hatching success suggest that nest density at arribada beaches is not high enough to single-handedly reduce hatching success to the drastically low levels observed [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

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Olive Ridley Sea Turtle Hatching Success as a Function of the Microbial Abundance in Nest Sand at Ostional, Costa Rica

2015

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Several studies have suggested that significant embryo mortality is caused by microbes, while high microbial loads are generated by the decomposition of eggs broken by later nesting turtles. This occurs commonly when nesting density is high, especially during mass nesting events (arribadas). However, no previous research has directly quantified microbial abundance and the associated effects on sea turtle hatching success at a nesting beach. The aim of this study was to test the hypothesis that the microbial abundance in olive ridley sea turtle nest sand affects the hatching success at Ostional, Costa Rica. We applied experimental treatments to alter the microbial abundance within the sand into which nests were relocated. We monitored temperature, oxygen, and organic matter content throughout the incubation period and quantified the microbial abundance within the nest sand using a quantitative polymerase chain reaction (qPCR) molecular analysis. The most successful treatment in increasing hatching success was the removal and replacement of nest sand. We found a negative correlation between hatching success and fungal abundance (fungal 18S rRNA gene copies g-1 nest sand). Of secondary importance in determining hatching success was the abundance of bacteria (bacterial 16S rRNA gene copies g-1 g-1 nest sand). Our data are consistent with the hypothesis that high microbial activity is responsible for the lower hatching success observed at Ostional beach. Furthermore, the underlying mechanism appears to be the deprivation of oxygen and exposure to higher temperatures resulting from microbial decomposition in the nest.

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Section: Discussionsupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Olive Ridley Sea Turtle Hatching Success as a Function of the Microbial Abundance in Nest Sand at Ostional, Costa Rica

2015

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“…The measurements of L. olivacea females found in the PNNG monitoring correspond with those reported on other beaches in the Colombian Pacific (Barrientos-Muñoz & Ramírez- Gallego, 2008;Hinestroza & Páez, 2001;Barrientos-Muñoz et al, 2014). Globally, the CCL of the nesting females of L. olivacea varies between 65.9 and 73.1 cm and those of the populations, between 60.8 and 83 cm, being the smallest marine turtle living species (Varo-Cruz, Monzón-Argüello, Carrillo, Calabuig, & Liriz-Loza, 2015).…”

Section: Discussionsupporting

confidence: 86%

“…In addition to the ETP, this species is distributed in tropical waters of the Indian and South Atlantic Ocean basins (Barrientos-Muñoz, Ramírez-Gallego, & Páez, 2015). In Colombia, it is the most common nesting turtle of the Pacific (Amorocho, Rodríguez-Zuluaga, Payán, Zapata, & Rojas, 2015), despite this, studies on its reproductive biology in Colombia have been reduced, spaced in time and carried out in a few locations (Amorocho, Rubio, & Díaz, 1992;McCormick, 1996;Martinez & Páez, 2000;Hinestroza & Páez, 2001;Pavía, Rodríguez-Zuluaga, & Amorocho, 2006;Barrientos-Muñoz & Ramírez-Gallego, 2008;Barrientos-Muñoz, Ramírez-Gallego, & Páez, 2014;Payán-Perea, Zorrilla-Arroyave, & Chirimía-Gonzáles, 2016). In this context, it is relevant to evaluate the effect that thermal variations associated with ENSO could have on marine turtle species of the Colombian Pacific, particularly on the different attributes related to the nesting process of L. olivacea in the marine protected area of Gorgona island.…”

mentioning

confidence: 99%

Relationship between sea surface temperature and the nesting of the Olive Ridley sea turtle Lepidochelys olivacea (Testudines: Cheloniidae) in Gorgona Island, Colombian Pacific

Gallego

Carmona

Payán³

et al. 2020

RBT

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Introduction: Lepidochelys olivacea is the most abundant sea turtle in the Colombian Pacific and oceanographic conditions at the Eastern Tropical Pacific may have an effect on its reproductive behavior Objective: To assess the relationship between reproductive aspects of L. olivacea nesting at Gorgona island and sea surface temperature at local and regional scales. Methods: Monthly mean data of reproductive attributes associated with nesting females, nests, eggs and hatchlings were established using records from Gorgona’s National Natural Park nesting monitoring and were correlated (cross-correlations) with SST of Gorgona island and Panama Bight, and with the temperature variability of the El Niño 1+2, El Niño 3, El Niño 3.4 and El Niño 4 regions, their thermal anomalies, and the ONI and SOI indexes. Significant correlations were included in a Generalized Additive Model. Results: Highest inverse correlation since maximum correlation is 1 was established between visits to the beach, number of nesting females, number of nests, clutch size, incubation days and hatching success and Niño 1+2 region with a lag of 12 months, whereas egg diameter, egg weight, straight carapace length and width and weight of hatchlings were correlated with Niño 4 anomaly, SOI and ONI indexes. It was also found that there is a non-linear tendency to decrease number of nesting females, number of nests, clutch size, egg diameter and egg weight with regional positive anomalies. Conclusions: Nesting attributes of L. olivacea in Gorgona correlate mainly with variations in regional SST, being low at high sea surface temperatures the year prior to nesting (12-month lag).

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“…Finally, individuals of L. olivacea, with a CCL ≤59.2 cm were considered as juveniles, individuals with 59.2 ≤CCL < 64.9 cm. were considered as sub-adult and individuals with a CCL  64.9 cm were considered as adults (Barrientos-Muñoz et al, 2014).…”

Section: Study Area and Data Collectionmentioning

confidence: 99%

Incidental capture of sea turtles in the artisanal gillnet fishery in Sechura Bay, northern Peru

Pingo¹,

Jiménez²,

Alfaro‐Shigueto³

et al. 2017

lajar

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ABSTRACT. Gillnets are recognized globally as one of the fishing gears with the highest levels of bycatch and mortality of sea turtles. Through onboard observer monitoring from July 2013 to June 2014 we assessed the bycatch of sea turtles by an artisanal gillnet fishery operating from Sechura Bay, Peru. One hundred and four sea turtles were incidentally caught in 53 observed fishing sets. The observed species composition of bycatch was green turtle Chelonia mydas (n = 100), hawksbill Eretmochelys imbricata (n = 3) and olive ridley Lepidochelys olivacea (n = 1). Bycatch occurred in 62.3% of monitored sets, with an average of 1.96 turtles caught per set. For all sea turtles combined, 28.8% of individuals were dead and 71.2% were alive at the time of retrieval. The majority of individuals caught were classified as juveniles and sub-adults, with an average carapace length (CCL) of 57.3 ± 0.9 cm for green turtles and 40.2 ± 2.4 cm for hawksbills. The mean annual catch per unit effort (CPUE) of sea turtles was 1.11 ± 0.31 turtles km -1 12 h -1), but varied by seasons. These results suggest that Sechura Bay is an important developmental habitat for juvenile and sub-adult green turtles and hawksbill turtles, but one subject to intense fishing interaction pressure. The development of monitoring programs, local awareness-raising activities, and enhanced management and protection of this critical foraging area and developmental habitat is recommended.

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NESTING ECOLOGY OF THE OLIVE RIDLEY SEA TURTLE (Lepidochelys olivacea) (CHELONIIDAE) AT EL VALLE BEACH, NORTHERN PACIFIC, COLOMBIA

Cited by 15 publications

References 7 publications

Olive Ridley Sea Turtle Hatching Success as a Function of the Microbial Abundance in Nest Sand at Ostional, Costa Rica

Olive Ridley Sea Turtle Hatching Success as a Function of the Microbial Abundance in Nest Sand at Ostional, Costa Rica

Relationship between sea surface temperature and the nesting of the Olive Ridley sea turtle Lepidochelys olivacea (Testudines: Cheloniidae) in Gorgona Island, Colombian Pacific

Incidental capture of sea turtles in the artisanal gillnet fishery in Sechura Bay, northern Peru

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