Abstract
In ecology, interaction networks allow the investigation of how interactions among species affect community structure and functioning. The structure of interaction networks can be nested and/or modular. Ecologically, the nested structure minimizes competition and increases the number of coexisting species, creating high diversity, while the modular structure occurs when there are non-overlapping groups of highly interacting consumer-resource species. Despite the importance of gastropod shells to hermit crabs, currently, few studies explored the structure of hermit crabs communities through a resource-usage perspective. Therefore, network analyses appear as an important tool to unveil how the use of empty shell as a resource rules hermit crabs communities through competition among species and rules hermit crabs populations through competition among distinct ontogenetic groups. This study investigated the resource usage pattern of empty gastropod shells by distinct ontogenetic stages of the hermit crab Calcinus tibicen from two different locations, using a network approach and the “Shell Adequacy Index” (SAI) analysis. The present results show that the interaction network between ontogenetic groups and gastropod shells was non-nested and modular and the SAI reflected the differences between males and ovigerous females in both locations, regarding shell size adequacy. We suggest that the modular structure may be a result of resource partitioning, which, in turn, is favored in habitats with a high degree of heterogeneity. The modular network structure may indicate habitat heterogeneity and resource partitioning. Future studies including other hermit crab species from the same areas should help determine how shells are partitioned interspecifically.
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We would like to thank “Universidade Estadual do Sudoeste da Bahia (UESB), Vitória da Conquista campus” for their technical and logistic support for this research. We also thank the undergraduate students Jaqueline de Oliveira, Anne F. Alves and Suzane Moreira for their field and laboratory assistance. The sampling of specimens conducted herein was performed in compliance with current applicable Brazilian state and federal laws concerning wild animals.
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All authors contributed to the study conception and design. MPS, GFBR, VR and MLN-F carried out the material preparation, data collection and analysis. MPS and GFBR elaborated the first draft of the manuscript. After that, all authors commented and suggested alterations or adaptations on previous versions of the manuscript. All authors have read and approved the final version of the manuscript.
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Santos, M.P., Rodrigues, G.F.B., Negreiros-Fransozo, M.L. et al. Resource partitioning and adequacy among ontogenetic groups in a hermit crab and gastropod shell network. Aquat Ecol 55, 253–264 (2021). https://doi.org/10.1007/s10452-020-09827-0
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DOI: https://doi.org/10.1007/s10452-020-09827-0