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Labastida-Estrada E, González-Cortés L, Karam-Martínez SG, Montoya-Márquez JA, Zúñiga-Marroquín T, Becerril-Morales F, Islas-Villanueva V. 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. JOURNAL OF EXPERIMENTAL ZOOLOGY. PART A, ECOLOGICAL AND INTEGRATIVE PHYSIOLOGY 2024; 341:563-577. [PMID: 38470019 DOI: 10.1002/jez.2804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 02/13/2024] [Accepted: 02/15/2024] [Indexed: 03/13/2024]
Abstract
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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Affiliation(s)
- Elizabeth Labastida-Estrada
- División de Estudios de Posgrado, Programa de Maestría en Ciencias: Ecología Marina, Universidad del Mar campus Puerto Ángel. Ciudad Universitaria, San Pedro Pochutla, Oaxaca, México
| | - Liliana González-Cortés
- División de Estudios de Posgrado, Programa de Maestría en Ciencias: Ecología Marina, Universidad del Mar campus Puerto Ángel. Ciudad Universitaria, San Pedro Pochutla, Oaxaca, México
| | - Samantha G Karam-Martínez
- Instituto de Recursos, Universidad del Mar campus Puerto Ángel. Ciudad Universitaria, San Pedro Pochutla, Oaxaca, México
| | - José Alberto Montoya-Márquez
- Instituto de Recursos, Universidad del Mar campus Puerto Ángel. Ciudad Universitaria, San Pedro Pochutla, Oaxaca, México
| | - Tania Zúñiga-Marroquín
- Instituto de Agroingeniería, Universidad del Papaloapan campus Loma Bonita, Avenida Ferrocarril, Ciudad Universitaria, Loma Bonita, Oaxaca, México
| | - Felipe Becerril-Morales
- Instituto de Agroingeniería, Universidad del Papaloapan campus Loma Bonita, Avenida Ferrocarril, Ciudad Universitaria, Loma Bonita, Oaxaca, México
| | - Valentina Islas-Villanueva
- Instituto de Genética, CONAHCYT-Universidad del Mar campus Puerto Ángel. Ciudad Universitaria, San Pedro Pochutla, Oaxaca, México
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Robledo-Avila LA, Phillips-Farfán BV, García-Bucio IY, Montes-Sánchez S, Herrera-Vargas MA, Contreras-Garduño J, Núñez-Anita RE, Martínez-Lendech N, Meléndez-Herrera E. Incubation in shaded hatcheries biases sex-determination but preserves Lepidochelys olivacea hatchling physiology. MARINE ENVIRONMENTAL RESEARCH 2023; 192:106244. [PMID: 37924794 DOI: 10.1016/j.marenvres.2023.106244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 09/29/2023] [Accepted: 10/24/2023] [Indexed: 11/06/2023]
Abstract
Some studies have associated ex situ conservation with cerebral and gonadal developmental delay, as well as decreased motor performance in Lepidochelys olivacea offspring. Ex situ management is also related to a more mature spleen and a differential leukocyte count in newly emerged Lepidochelys olivacea hatchlings. The physiological relevance of a more mature spleen is unknown in sea turtles, but studies in birds suggest an increased immune response. Because egg relocation to hatcheries is a common conservation practice, it is imperative to know its impact on hatchling physiology. Herein, plasma activity of superoxide dismutase, alkaline phosphatase and the alternative complement pathway, as well as total antioxidant capacity and hydrogen peroxide concentrations were quantified in hatchlings from in situ and ex situ nests under basal conditions at nest emergence. Toll-like receptor 4 (tlr4), heat shock proteins (hsp) 70 and hsp90 expression were quantified in the spleen and liver of the hatchlings. Hepatocyte density and nuclear area were quantified in histological sections of the liver and all turtles were sexed by histological sectioning of the gonads. Total antioxidant capacity and hydrogen peroxide concentrations in plasma were lower in turtles from ex situ nests, while tlr4 and hsp70 mRNA expression was higher in the spleen but not in the liver. Ex situ incubation produced 98% male hatchlings, whereas in situ incubation produced 100% females. There were no other differences in the attributes sampled between hatchlings emerging from ex situ and in situ treatments. The results suggest that ex situ relocated turtles may be less prone to oxidative stress than in situ incubated hatchlings and could have more mature splenic function. Together, the data suggest that ex situ relocation to shaded hatcheries biased sex determination but preserved the general physiological condition of sea turtle hatchlings.
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Affiliation(s)
- Liliana Areli Robledo-Avila
- Instituto de Investigaciones sobre Recursos Naturales, Universidad Michoacana de San Nicolás de Hidalgo, Av. San Juanito Itzícuaro s/n, Colonia Nueva Esperanza, C.P. 58337, Morelia, Michoacán, Mexico.
| | - Bryan Víctor Phillips-Farfán
- Laboratorio de Nutrición Experimental, Instituto Nacional de Pediatría, Insurgentes Sur 3700, Letra C, Alcaldía Coyoacán, C.P. 04530, Cd. de México, Mexico.
| | - Irma Yunuen García-Bucio
- Instituto de Investigaciones sobre Recursos Naturales, Universidad Michoacana de San Nicolás de Hidalgo, Av. San Juanito Itzícuaro s/n, Colonia Nueva Esperanza, C.P. 58337, Morelia, Michoacán, Mexico.
| | - Shannen Montes-Sánchez
- Instituto de Investigaciones sobre Recursos Naturales, Universidad Michoacana de San Nicolás de Hidalgo, Av. San Juanito Itzícuaro s/n, Colonia Nueva Esperanza, C.P. 58337, Morelia, Michoacán, Mexico.
| | - Ma Antonia Herrera-Vargas
- Instituto de Investigaciones sobre Recursos Naturales, Universidad Michoacana de San Nicolás de Hidalgo, Av. San Juanito Itzícuaro s/n, Colonia Nueva Esperanza, C.P. 58337, Morelia, Michoacán, Mexico.
| | - Jorge Contreras-Garduño
- Escuela Nacional de Estudios Superiores, Unidad Morelia, Universidad Nacional Autónoma de México, Antigua Carretera a Pátzcuaro 8701, Ex-Hacienda de San José de la Huerta, 58190, Morelia, Michoacán, Mexico.
| | - Rosa Elvira Núñez-Anita
- Facultad de Medicina Veterinaria y Zootecnia, Universidad Michoacana de San Nicolás de Hidalgo, 58130, Morelia, Michoacán, Mexico.
| | - Norma Martínez-Lendech
- Escuela Nacional de Estudios Superiores, Unidad Morelia, Universidad Nacional Autónoma de México, Antigua Carretera a Pátzcuaro 8701, Ex-Hacienda de San José de la Huerta, 58190, Morelia, Michoacán, Mexico.
| | - Esperanza Meléndez-Herrera
- Instituto de Investigaciones sobre Recursos Naturales, Universidad Michoacana de San Nicolás de Hidalgo, Av. San Juanito Itzícuaro s/n, Colonia Nueva Esperanza, C.P. 58337, Morelia, Michoacán, Mexico.
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Unda-Díaz NM, Phillips-Farfán BV, Nava H, Lopez-Toledo L, Murata C, Lajud N, Herrera-Vargas MA, Arreola Camacho CA, Torner L, Fuentes-Farías AL, Meléndez-Herrera E. Negative Effects on Neurogenesis, Ovariogenesis, and Fitness in Sea Turtle Hatchlings Associated to ex situ Incubation Management. Front Ecol Evol 2022. [DOI: 10.3389/fevo.2022.850612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Sea turtle egg relocation and hatchery incubation (hereafter termed ex situ incubation) is an effective strategy to protect clutches when in situ egg incubation is not viable. Nevertheless, it negatively affects the ontogenesis of male gonads and brain areas homologous to the mammalian hippocampus, as well as body size and fitness. Thus, it is imperative to analyze the effects of ex situ incubation on other developmental aspects and extend these observations to females. This work evaluated the effect of ex situ management on neurogenesis (cell proliferation in the dorsal and medial ventricular zones, neuronal integration in the dorsomedial and medial cortices), ovary cell proliferation, body size (mass and length) and self-righting ability. Additionally, this study examined if the incubation microenvironment is different between in situ and ex situ nests and whether it could contribute to explain the biological traits. An analysis of principal components showed differences in biological variables of hatchlings between in situ and ex situ clutches, driven by contrasting temperatures and silt composition. Each biological variable was also analyzed with linear mixed models using in situ vs. ex situ clutches, abiotic variables and their interaction. Turtles from ex situ clutches showed: (1) fewer proliferating cells in the dorsal and medial ventricular zones; (2) less mature neurons in the dorsomedial and medial cortices; (3) ovaries with a lesser number of proliferating cells; (4) lower body mass and length at emergence; and (5) slower self-righting time. Together, the results suggest that ex situ incubation in hatcheries is related to a slowing down of neurogenesis, ovariogenesis, body size and self-righting ability in hatchlings. Future studies should evaluate the effect of ex situ incubation on cognitive and reproductive performance to understand the long-term consequences of altered organogenesis. These studies should also disentangle the differential contribution of egg movement, reburial, nesting environment and parental origin to development. This information would likely result in better conservation strategies for sea turtles.
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