Nest relocation of Leatherback turtles (Dermochelys coriacea) decrease the rate of non-developed eggs https://doi.org/10.12982/VIS.2022.022
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Abstract
Female leatherback sea turtles (Dermochelys coriacea) often oviposit in locations with high risk of predation, human activity, flooding, or erosion; thus, influencing hatching rates. It has been hypothesized that the relocation of these nests would significantly increase hatching success. In this study, we measured various nest traits to determine whether nest relocation has any influence on hatching success. Ten parameters of relocated nests (n=8) and nonrelocated nests (n=8) were compared. These parameters included incubation period (days), number of hatched eggs, number of survival hatchlings, number of healthy hatchlings, number of hatchlings in critical care unit (CCU) box, number of stillborn hatchlings, number of non-hatched eggs, number of non-developed eggs, number of embryonic dead hatchlings, and number of eggs without yolks. Poisson distribution, a generalized linear model employing the log link function, was used to compare differences in the rate values of the parameters between relocated and nonrelocated groups. It was found that the rate of non-developed eggs in the relocated nests was significantly lower than in the nonrelocated nests (P < 0.001). In conclusion, nest relocation was not detrimental to hatching success and decrease rate of non-developed eggs. Based on these findings, nest relocation may be an effective conservation method for leatherback turtles.
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References
Abella, E., García-Cerdá, R.M., Marco, A., 2017. Estimating the fertilization rate of sea turtle nests: comparison of two techniques. Basic Appl. Herpetol. 31, 33-44.
Bell, B. A., Spotila, J. R., Paladino, F. V., Reina, R. D., 2004. Low reproductive success of leatherback turtles, Dermochelys coriacea, is due to high embryonic mortality. Biol. Conserv. 115, 131-138.
Bilinski, J. J., Reina, R. D., Spotila, J. R., Paladino, F. V., 2001. The effects of nest environment on calcium mobilization by leatherback turtle embryos (Dermochelys coriacea) during development. Comp. Biochem. Physiol. A. Mol. Integr. Physiol. 130, 151-162.
Booth, D., Burgess, E., McCosker, J., Lanyon, J., 2004. The influence of incubation temperature on posthatching fitness characteristics of turtles. Int. Congr. Ser. 1275, 226–233.
Campbell, S., 2019. Beach composition preferences for nesting populations of leatherback sea turtles (Dermochelys coriacea), Armila Beach, Guna Yala Comarca. Independent Study Project (ISP) Collection. 3112.
Conrad, J., Wyneken, J., Garner, J., Garner, S., 2011. Experimental study of dune vegetation impact and control on leatherback sea turtle Dermochelys coriacea nests. Endanger. Species Res. 15, 13-27.
Department of Marine and Coastal Resources, 2020. Infographic 2010 (Leatherback turtle). Available at https://km.dmcr.go.th/c_1/s_441/d_19210.
Dobson, A. J., Barnett, A. G., 2018. An Introduction to Generalized Linear Models. CRC press, Florida.
Dutton, D. L., Dutton, P. H., Chaloupka, M., Boulon, R. H., 2005. Increase of a Caribbean leatherback turtle Dermochelys coriacea nesting population linked to long-term nest protection. Biol. Conserv. 126, 186-194.
Eckert, K. L., Bjorndal, K. A., Abreu-Grobois, F. A., Donnelly, M., 1999. Research and Management Techniques for the Conservation of Sea Turtles. SSC/IUCN Marine Turtle Specialist Group. Consolidated Graphic Communications, Pennsylvania.
Foley, A., 1998. The nesting ecology of the loggerhead turtle (Caretta caretta) in the Ten Thousand Islands, Florida. Ph.D. Dissertation, University of South Florida, Tampa, Florida, USA.
Furler, S. 2005. Hatching success of the leatherback sea turtle, Dermochelys coriacea, in natural and relocated nests on Gandoca beach, Costa Rica. M.Sc. Thesis, University of Basel, Basel, Switzerland.
García–Grajales, J., Meraz Hernando, J. F., Arcos García, J. L., Ramírez Fuentes, E., 2019. Incubation temperatures, sex ratio and hatching success of leatherback turtles (Dermochelys coriacea) in two protected hatcheries on the central Mexican coast of the Eastern Tropical Pacific Ocean. Anim. Biodivers. Conserv. 42.1, 143-152.
Hendrickson, J. R., 1980. The ecological strategies of sea turtles. Am. Zool. 20, 597-608.
Hirth, H. F., Kasu, J., Mala, T., 1993. Observations on a leatherback turtle Dermochelys coriacea nesting population near Piguwa, Papua New Guinea. Biol. Conserv. 65, 77-82.
Irvine, L., Fletcher, P., McCoy, W., 2015. WCS Hawksbill Conservation Project 2014 Annual Report - Pearl Cays, Nicaragua.
Kamel, S. J., Mrosovsky, N., 2004. Nest site selection in leatherbacks, Dermochelys coriacea: individual patterns and their consequences. Anim. Behav. 68, 357-366.
Miller, J. D., Mortimer, J. A., Limpus, C. J., 2017. A field key to the developmental stages of marine turtles (Cheloniidae) with notes on the development of Dermochelys. Chelonian Conserv. Biol.16, 111–122.
Miller, J.D., 1997. Reproduction in sea turtles. In: Lutz, P.L., Musick, J.A. (Eds.), The Biology of Sea Turtles. CRC Press, Florida, pp. 51–82.
Phillott, A. D., Godfrey, M. H., 2020. Assessing the evidence of ‘infertile’sea turtle eggs. Can. J. Zool. 41, 329-338.
Reboul, I., Booth, D., Rusli, U., 2021. Artificial and natural shade: implications for green turtle (Chelonia mydas) rookery management. Ocean Coast. Manag. 204, 105521.
Reece, S., Broderick, A., Godley, B., West, S., 2002. The effects of incubation environment, sex and pedigree on the hatchling phenotype in a natural population of loggerhead turtles. Evol. Ecol. Res. 4, 737-748.
Reina, R. D., Mayor, P. A., Spotila, J. R., Piedra, R., Paladino, F. V., 2002. Nesting ecology of the leatherback turtle, Dermochelys coriacea, at Parque Nacional Marino las Baulas, Costa Rica: 1988–1989 to 1999–2000. Copeia 3, 653-664.
Roe, J. H., Clune, P. R., Paladino, F. V., 2013. Characteristics of a leatherback nesting beach and implications for coastal development. Chelonian Conserv. Biol. 12, 34-43.
Sieg, A. E., Binckley, C. A., Wallace, B. P., Tomillo, P. S., Reina, R., Paladino, F. V., Spotila, J. R., 2011. Sex ratios of leatherback turtles: hatchery translocation decreases metabolic heating and female bias. Endanger. Species Res. 15, 195-204.
Tiwari, M., Dutton D.L., Garner J.A., 2011. Nest relocation. In Dutton, P. H., Squires, D., & Ahmed, M. (Eds). Conservation of Pacific Sea Turtles (pp.87-96). Hoholulu, Hawaii: University of Hawaiʻi Press.
Tomillo, P. S., Suss, J. S., Wallace, B. P., Magrini, K. D., Blanco, G., Paladino, F. V., Spotila, J. R., 2009. Influence of emergence success on the annual reproductive output of leatherback turtles. Mar. Biol. 156, 2021-2031.
Türkozan, O., Yılmaz, C., 2007. Nest relocation as a conservation strategy: looking from a different perspective. Mar. Turt. Newsl., 118, 6-8.
Valenzuela, N., Literman, R., Neuwald, J. L., Mizoguchi, B., Iverson, J. B., Riley, J. L., Litzgus, J. D., 2019. Extreme thermal fluctuations from climate change unexpectedly accelerate demographic collapse of vertebrates with temperature-dependent sex determination. Sci. Rep. 9, 4254.
Wallace, B.P., DiMatteo, A.D., Bolten, A.B., Chaloupka, M.Y., Hutchinson, B.J., Abreu-Grobois, F.A., Mortimer, J.A., Seminoff, J.A., Amorocho, D., Bjorndal, K.A., Bourjea, J., Bowen, B.W., Briseño Dueñas, R., Casale, P., Choudhury, B.C., Costa, A., Dutton, P.H., Fallabrino, A., Finkbeiner, E.M., Girard, A., Girondot, M., Hamann, M., Hurley, B.J., López-Mendilaharsu, M., Marcovaldi, M.A., Musick, J.A., Nel, R., Pilcher, N.J., Troëng, S., Witherington, B., Mast, R.B., 2011. Global conservation priorities for marine turtles. PLoS One, 6, e24510.
Wallace, B.P., DiMatteo, A.D., Hurley, B.J., Finkbeiner, E.M., Bolten, A.B., Chaloupka, M.Y., Hutchinson, B.J., Abreu-Grobois, F.A., Amorocho, D., Bjorndal, K.A., Bourjea, J., Bowen, B.W., Dueñas, R.B., Casale, P., Choudhury, B.C., Costa, A., Dutton, P.H., Fallabrino, A., Girard, A., Girondot, M., Godfrey, M.H., Hamann, M., López-Mendilaharsu, M., Marcovaldi, M.A., Mortimer, J.A., Musick, J.A., Nel, R., Pilcher, N.J., Seminoff, J.A., Troëng, S., Witherington, B., Mast, R.B., 2010. Regional management units for marine turtles: a novel framework for prioritizing conservation and research across multiple scales. PLoS One, 5, e15465.
Wallace, B.P., Tiwari, M., Girondot, M., 2013. Dermochelys coriacea. The IUCN Red List of Threatened Species 2013: e.T6494A43526147. Available at http://dx.doi.org/10.2305/IUCN.UK.2013-2.RLTS.T6494A43526147.en.