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Updated: May 17, 2026

The Barnacle Balanus improvisus as a Marine Model - Culturing and Gene Expression
Published on: August 8, 2018
Host-driven adaptive radiation and host usage in sponge-associated barnacles
Meng-Chen Yu1,2,3, Hsiu-Chin Lin4,5,6, Gregory A Kolbasov7
1Computational Biology Institute, Department of Biostatistics and Bioinformatics, Milken Institute School of Public Health, George Washington University, Washington, DC, 20052, USA.
Background:
Adaptive radiation often involves ecological and morphological diversification, influenced by environmental opportunities, such as symbiotic interactions. Sponge-associated barnacles have evolved specialized traits, such as modified shells, to thrive within sponge hosts. However, the evolutionary mechanisms driving their diversification and host specificity remain unclear.
Results:
We integrate molecular phylogenetics (12S, 16S, 18S, COI, H3), detailed morphology, and ecological assessment to examine how host usage influences sponge-associated barnacle diversification. Our findings reveal two primary barnacle clades: Membranous-Base (M-Base) and Calcareous-Base (C-Base), each exhibiting distinct morphological adaptations. Most of the species exhibit strong host specificity being specialists within particular sponges. However, there is no significant correlation between morphology and host specificity, nor a clear co-evolutionary pattern with sponge hosts. These results challenge the assumption that host-driven specialization alone explains diversification.
Conclusions:
Our findings suggest that sponge-associated barnacles show a pattern of host-associated divergence, with generalist species occupying basal positions and specialization evolving from ancestrally broader host-use states. The last common ancestor of sponge barnacles appears to have been associated with Clionaida sponges, which may serve as permissive hosts due to their lower biochemical diversity.
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