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Beneath the surface: co-habitation of recruits of the land crab Johngarthia lagostoma and its relevance for conservation on oceanic islands

Published online by Cambridge University Press:  05 November 2024

Marcelo Antonio Amaro Pinheiro Open the ORCID record for Marcelo Antonio Amaro Pinheiro [Opens in a new window] ,
Isabella Dias-Silva Open the ORCID record for Isabella Dias-Silva [Opens in a new window] ,
Nicholas Kriegler Open the ORCID record for Nicholas Kriegler [Opens in a new window] ,
William Santana Open the ORCID record for William Santana [Opens in a new window]  and
Marcio Camargo Araujo João Open the ORCID record for Marcio Camargo Araujo João [Opens in a new window]
Marcelo Antonio Amaro Pinheiro*
Affiliation:
Departamento de Ciências Biológicas e Ambientais, Universidade Estadual Paulista (UNESP), Instituto de Biociências – Campus do Litoral Paulista (IB/CLP), Grupo de Pesquisa em Biologia de Crustáceos (CRUSTA), São Vicente, SP, Brazil Programa de Pós-Graduação em Biodiversidade de Ambientes Costeiros (PPG-BAC), UNESP IB/CLP, São Vicente, SP, Brazil Programa de Pós-Graduação em Ecologia, Evolução e Biodiversidade (PPG-EEB), UNESP Campus de Rio Claro (IB/RC), Rio Claro, SP, Brazil
Isabella Dias-Silva
Affiliation:
Departamento de Ciências Biológicas e Ambientais, Universidade Estadual Paulista (UNESP), Instituto de Biociências – Campus do Litoral Paulista (IB/CLP), Grupo de Pesquisa em Biologia de Crustáceos (CRUSTA), São Vicente, SP, Brazil
Nicholas Kriegler
Affiliation:
Departamento de Ciências Biológicas e Ambientais, Universidade Estadual Paulista (UNESP), Instituto de Biociências – Campus do Litoral Paulista (IB/CLP), Grupo de Pesquisa em Biologia de Crustáceos (CRUSTA), São Vicente, SP, Brazil Programa de Pós-Graduação em Ecologia, Evolução e Biodiversidade (PPG-EEB), UNESP Campus de Rio Claro (IB/RC), Rio Claro, SP, Brazil
William Santana
Affiliation:
Museu de Paleontologia Plácido Cidade Nuvens, Universidade Regional do Cariri (URCA), Crato, CE, Brazil
Marcio Camargo Araujo João
Affiliation:
Departamento de Ciências Biológicas e Ambientais, Universidade Estadual Paulista (UNESP), Instituto de Biociências – Campus do Litoral Paulista (IB/CLP), Grupo de Pesquisa em Biologia de Crustáceos (CRUSTA), São Vicente, SP, Brazil Programa de Pós-Graduação em Ecologia, Evolução e Biodiversidade (PPG-EEB), UNESP Campus de Rio Claro (IB/RC), Rio Claro, SP, Brazil
*
Corresponding author: Marcelo Antonio Amaro Pinheiro; Email: [email protected]
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Abstract

Gecarcinid crabs have their life cycles in antagonistic scenarios, with their larvae developing in the sea and the juvenile/adult phases occurring on land. Adults migrate from land to sea to release their larvae, which return to land upon reaching the megalopa stage. Recruitment and early instar traits in gecarcinids crabs remain unknown, leading to some species lacking age-specific information. Despite massive recruitment observed in some insular gecarcinid species (e.g. Gecarcoidea natalis), recruits are generally expected to be few and exhibit cryptic behaviour, potentially occupying the burrows of conspecifics. We evaluated whether recruits of Johngarthia lagostoma on Trindade Island, Brazil, co-inhabit larger conspecific burrows, analysing this occurrence and examining their growth patterns, density, and body size across different lunar phases. Johngarthia lagostoma recruits inhabit conspecific burrows, either abandoned or occupied by adult crabs, but always with leaves stored in the inner chamber. Recruits in co-inhabiting behaviour reach a maximum carapace width of 7.3 mm, and after that, they are likely detected by the adults and possibly cannibalized or leave burrows naturally. During the full moon, the higher density and smaller size of recruits were recorded, indicating a recruitment lunar phase. It is crucial to ascertain the prevalence of co-inhabitation behaviours in other land crab species to expand the knowledge about recruitment patterns in these key community species.

Keywords

endangered speciesGecarcinidaeinsular crabsrecruitmentreproduction
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 104 , 2024 , e102
Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom

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