Population density of Ocypode gaudichaudii h. Milne Edwards & Lucas, 1843 (Decapoda: Ocypodidae) on sandy beaches of Guayas, Ecuador

Authors

  • Divy Rodrigo-Calderón Facultad de Ciencias Naturales, Universidad de Guayaquil, Av. Raúl Gómez Lince y Av. Juan Tanca Marengo, Guayaquil, Ecuador. https://orcid.org/0009-0007-2573-072X
  • John Ramos Veliz laboratorio de Investigación en Ecosistemas Acuáticos, Centro de Aguas y Desarrollo Sustentable, Escuela Superior Politécnica del Litoral, Campus Gustavo Galindo, Km 30.5 vía perimetral. Guayaquil, Ecuador. - CALAPPA “Investigando invertebrados acuáticos”, Guayaquil, Ecuador https://orcid.org/0000-0002-9325-7256
  • Israel López-Rodríguez Facultad de Ciencias Naturales, Universidad de Guayaquil, Av. Raúl Gómez Lince y Av. Juan Tanca Marengo, Guayaquil, Ecuador. https://orcid.org/0009-0004-5532-2864

DOI:

https://doi.org/10.62430/rtb20262412071

Keywords:

Burrow count, Ghost crabs, Population assessment

Abstract

Sandy beaches provide recreational and tourism services and offer coastal protection, in addition to serving as the habitat of the ghost crab Ocypode gaudichaudii H. Milne Edwards & Lucas, 1843, where its populations may be affected by human activities. In this regard, the population density and structure of O. gaudichaudii were assessed on four beaches in the province of Guayas, Ecuador, during May–June 2025, using the quadrat method to count burrows and measure burrow entrance diameter (BED) as an indirect estimator of the crab’s body size; a total of 832 burrows were evaluated. The results showed that Engabao was the beach with the highest number of organisms and the greatest variability in burrow opening diameter, suggesting a more representative and abundant population structure compared to the others. This study is a first step toward future assessments of the ecological status of the sandy beaches of the Ecuadorian mainland. 

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Author Biography

John Ramos Veliz, laboratorio de Investigación en Ecosistemas Acuáticos, Centro de Aguas y Desarrollo Sustentable, Escuela Superior Politécnica del Litoral, Campus Gustavo Galindo, Km 30.5 vía perimetral. Guayaquil, Ecuador. - CALAPPA “Investigando invertebrados acuáticos”, Guayaquil, Ecuador

Sandy beaches offer recreational, tourism, and coastal protection services, and are also the habitat of the ghost crab Ocypode gaudichaudii, whose populations can be affected by anthropogenic activities. Therefore, a preliminary study of its population density and structure was conducted on four beaches in the Guayas province during March-April 2025. Using the quadrat method, burrows were counted, and the burrow opening diameter (BID) was measured as an estimator of crab size. The results showed that Engabao beach had the most organisms and the greatest variability in opening diameter, suggesting a more representative and abundant population structure compared to the others. This study is a first step toward future assessments of the ecological status of sandy beaches on the Ecuadorian mainland.

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Published

2026-04-27

How to Cite

Rodrigo-Calderón, D., Ramos Veliz, J., & López-Rodríguez, I. (2026). Population density of Ocypode gaudichaudii h. Milne Edwards & Lucas, 1843 (Decapoda: Ocypodidae) on sandy beaches of Guayas, Ecuador . The Biologist, 24(1). https://doi.org/10.62430/rtb20262412071