Abstract
The fundamental ecological niche is determined by individuals’ ability to cope with abiotic conditions; however, biotic interactions (e.g., competition) can also influence species’ distribution ranges, reducing the fundamental niche to the realized niche. Several species of the genera Clibanarius and Calcinus overlap in their distributions. The agonistically dominant Calcinus species inhabits mostly lower intertidal levels, while Clibanarius is more abundant in the abiotically demanding upper strata. Additionally, evidence of microhabitat competitive exclusion shows that the superior competitor, Ca. californiensis, causes the vertical displacement of Cl. albidigitus. However, it is unknown whether competitive exclusion between species of these genera has influenced their distributions at the macroecological scale. We used ecological niche models to compare the distribution and the habitat suitability of species of these genera. We used databases of species occurrences and bioclimatic and geophysical variables to model and map the species’ niches. Species of the two hermit crab genera showed strong overlap in their habitat suitability. Calcinus and Clibanarius species occur in broad sympatry at the regional scale without regions of partial overlap that would indicate competitive exclusion. Therefore, competitive exclusion among species of these genera seems to act only on a microhabitat scale in the most dynamic shoreline areas.
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Acknowledgements
This research was funded by UNAM-PAPIIT-IN218321. We thank Posgrado en Ciencias del Mar y Limnologia. We thank Consejo Nacional de Ciencia y Tecnologia (CONACyT) for scholarships CVU-828535 to EEGC and CVU-475263 to LEAG. We especially thank Dr. Lynna Kiere for reviewing this article and for helping with the English editing.
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Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México, UNAM-PAPIIT IN-218321, Guillermina Alcaraz
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Garcia-Cardenas, E.E., Angeles-Gonzalez, L.E. & Alcaraz, G. Hermit crabs of the genera Calcinus and Clibanarius show no evidence of competitive exclusion at a geographic scale. Hydrobiologia (2024). https://doi.org/10.1007/s10750-024-05501-w
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DOI: https://doi.org/10.1007/s10750-024-05501-w