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Recruitment of the endangered limpet Patella ferruginea in the Chafarinas Islands (SW Mediterranean)

Published online by Cambridge University Press:  21 November 2022

Javier Guallart Open the ORCID record for Javier Guallart [Opens in a new window] ,
José Templado  and
Ángel A. Luque Open the ORCID record for Ángel A. Luque [Opens in a new window]
Javier Guallart
Affiliation:
Laboratorio de Biología Marina, Departamento de Zoología, Universitat de València, E-46100 Burjassot (Valencia), Spain
José Templado
Affiliation:
Museo Natural de Ciencias Naturales (MNCN-CSIC), José Gutiérrez Abascal, 2., 28006 Madrid, Spain
Ángel A. Luque*
Affiliation:
Centro de Investigación en Biodiversidad y Cambio Global (CIBC-UAM), Universidad Autónoma de Madrid, C/Darwin, 2, 28049 Madrid, Spain
*
Author for correspondence: Ángel A. Luque, E-mail: angel.luque@inv.uam.es
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Abstract

The recruitment of the endangered limpet Patella ferruginea in the Chafarinas Islands (SW Mediterranean) was studied over a 17-year period (1999‒2015). A total of 8115 recruits <20 mm in maximum diameter were counted in 95 transect censuses sampled during the study period. The presence of recruits began at the end of winter or beginning of spring (March‒April), when they reached a maximum shell diameter (MD) of at least 4 mm, with a peak in abundance occurring in spring. Smaller recruits were found on the lower midlittoral on the fringe of the vermetid gastropod Dendropoma lebeche and the crustose coralline algae Neogoniolithon brassica-florida, which suggests that settlement occurs at this shore level. Recruits reach 12‒27 mm at the end of their first year of life. A regular recruitment was detected for all studied years, with an average of 11.71 recruits m−1 across the study period. However, recruitment exhibited high interannual variability and did not occur evenly along the coastline of the islands. Higher recruitment was observed in 2001, 2011 and 2012, with a maximum density of 69.07 recruits m−1 in one transect in 2012. The density of recruits decreased in summer. No significant correlation was found between the density of recruits and adults. Between 1999‒2010, 29.29% of recruits were ‘phoretic’ on the shell of adults (1.81 recruits per host on average). Recruits climbed on to adults sometime after settlement, thus we suggest that ‘phoresy’ could favour the survival of young limpets instead of being due to selective settlement on adults. To improve and standardize recruitment monitoring in future studies, we propose that recruits are considered as those specimens <20 mm in MD and that recruitment censuses are carried out in spring, with additional censuses after summer to detect juvenile mortality. Additionally, we propose that 1 mm interval size classes are used for growth studies based on size‒frequency analyses.

Keywords

Alboran SeaconservationmonitoringPatellidaePatellogastropodaphoresy
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 102 , Issue 8 , December 2022 , pp. 580 - 595
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom

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Footnotes

The online version of this article has been updated since original publication. A notice detailing the change has also been published

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