Population assessment and monitoring estrategy for Atelopus spurrelli in the Utría National Natural Park, Colombia
DOI:
https://doi.org/10.18636/bioneotropical.v4i2.136Keywords:
Amphibia, Harlequin toad, Population estimation.Abstract
Objectives: Estimate A. spurrelli density by distance sampling and perform a statistical power analysis for an eventual monitoring, based on the sampling and data obtained in the Utría NNP. Methodology: Population density was estimated by distance sampling with the software DISTANCE 6.0 Release 2, using nine transects following the course of the streams with variable length. The statistical power was estimated with the software Monitor 11.0. Results: The estimated density was 0,03 individuals/m2 (CV=12,8%) of A. spurrelli associated to streams. The statistical power showed that implementing a monitoring program for the species would imply two annual samplings for three years, in order to detect exponential changes up to 12% with a power of 85%. Conclusion: In an eventual monitoring program for A. spurrelli, operational and technical capacity from staff in charge must be assessed, in order to determine sampling periodicity and frequency according to the results obtained in this study.
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References
Barry SC, Welsh AH. 2001. Distance sampling methodology. J R Stat Soc. 63 (Part 1): 31-53.
BirdLife International. Important bird areas factsheet: Parque Nacional Natural Ensenada de Utría. (En línea) 2012 (Acceso 24 marzo) URL disponible en: http:// www.birdlife.org
Bolívar W, Lötters S. Atelopus spurrelli. (En línea) 2004 (Acceso 24 marzo) URL disponible en: http://www.iucnredlist.org
Buckland ST, Anderson DR, Burnham KP, Laake JL. 1993. Distance sampling: Estimating abundance of biological populations. London: Chapman and Hall. 446 pp. Buckland ST, Anderson DR, Burnham KP, Laake JL, Borchers D, Thomas L. 2001. Introduction to the distance sampling: estimating abundance of biological popu-lations. Oxford: Oxford University Press.
Burnham KP, Anderson DR. 2002. Model selection and multimodel inference: A practical information-theoretic approach. 2nd ed. New York: Springer-Verlag. 488 pp. Castro-Herrera F, Bolívar-García W. 2010. Libro Rojo de los Anfibios del Valle del Cauca. Cali: casa editorial, no la impreta. 200 pp.
Frost, DR. Amphibian species of the World: an online reference. Version 5.6 (9 January 2013). (En línea) 2013 (Acceso 24 noviembre) URL disponible en: http://research.amnh. org/ herpetology/amphibia/index.html. New York: American Museum of Natural History.
Gardner T. 2001. Declining amphibian populations: a global phenomenon in conservation biology. An Biodivers Conservat. 24 (2): 25-44.
Gibbs JP, Ene E. Program monitor: Estimating the statistical power of ecological monitoring programs. Version 11.0.0 (En línea) 2010 (Acceso 25 mayo). URL disponible en: www.esf.edu/efb/gibbs/monitor/
La Marca E, Lips KR, Lötters S, Puschendorf R, Ibáñez R, Rueda-Almonacid JV, 2005. Catastrophic population declines and extinctions in neotropical harlequin frogs (Bufonidae: Atelopus). Biotropica 37 (2): 190-201.
Lampo M, Celsa SJ, Rodríguez-Contreras A, Rojas-Runjaic F, García CZ. 2012. High turnover rates in remnant popula- tions of the harlequin frog Atelopus cruciger (Bufonidae): Low risk of extinction? Biotropica. 44 (33): 420-6.
Lips KR. 1999. Mass mortality and population declines of anurans at an upland site in Western Panama. Conserv Biol. 13 (1): 117-25.
Lötters S. 1996. The neotropical toad genus Atelopus. Checklist - Biology - Distribution. Köln: M Vences & Glaw Verlags.
Lötters S, La Marca E, Stuart S, Gagliardo R, Veith M. 2004. A new dimension of current biodiversity loss. [Revista en línea]. Herpetotropicos. 1(3): 29-31. (Acceso 20 mayo de 2012). URL disponible en: http://erevistas.saber. ula.ve/index.php/herpetotropicos/article/view/680/634
Lötters S. 2007. The fate of the harlequin toads-help through a synchronous multi-disciplinary approach and the IUCN. Amphibian conservation action plan? Mitt Mus Nat kd Berl Zool Reihe. 83: 69-73.
Luger M, Garner TWJ, Ernst R, Hödl W, Lötters S. 2008. No evidence for precipitous declines of harlequin frogs (Atelopus) in the Guyanas. Stud Neotrop Fauna E. 43 (3): 177-80.
Rivera CM. 2005. Atelopus spurrelli. In: Rueda-Almonacid JV, Rodríguez-Mahecha JV, La Marca E, Lötters S, Kahn T, Angulo A (eds.). Ranas arlequines. Bogotá: Conservación Internacional. 158 pp.
Rueda LA. 2008. Colorful harlequin frog re-discovered in Colombia. [Revista en línea]. Froglog. 86: 1-2. (Acceso 10 de junio de 2010. URL disponible en: https:// www.amphibians.org/wp-content/uploads/2011/08/ Froglog86.pdf
Schwarz CJ. Estimating power/simple size using Program Monitor. (En línea) 2013 (Acceso 20 de noviembre). URL http://people.stat.sfu.ca/~cschwarz/Stat-650/Notes/ PDFbigbook-R/R-part020.pdf
Thomas L, Buckland ST, Rexstad EA, Laake JL, Strindberg S, Hedley SL, et al. 2010. Distance software: design and analysis of distance sampling surveys for estimating population size. J Appl Ecol. 47: 5-14.
UICN (Unión Internacional para la Conservación de la Naturaleza). 2013. The IUCN Red List of Threatened Species. Version 2013.2. (Acceso 15 de diciembre de 2013). En: http://www.iucnredlist.org
Vásquez VH, Serrano MA. 2009. Las áreas naturales protegidas de Colombia. Bogotá: Conservación Interna- cional, Colombia y Fundación Biocolombia.
Young BE, Lips KR, Reaser JK, Ibáñez R, Salas AW, Cedeño JR, et al. 2001. Population declines and priorities for amphibian conservation in Latin America. Conserv Biol. 15 (5): 1213-23.
