Symbiont transmission in marine sponges: reproduction, development, and metamorphosis
2022
Tyler J. Carrier | Manuel Maldonado | Lara Schmittmann | Lucía Pita | Thomas C. G. Bosch | Ute Hentschel
Abstract Marine sponges (phylum Porifera) form symbioses with diverse microbial communities that can be transmitted between generations through their developmental stages. Here, we integrate embryology and microbiology to review how symbiotic microorganisms are transmitted in this early-diverging lineage. We describe that vertical transmission is widespread but not universal, that microbes are vertically transmitted during a select developmental window, and that properties of the developmental microbiome depends on whether a species is a high or low microbial abundance sponge. Reproduction, development, and symbiosis are thus deeply rooted, but why these partnerships form remains the central and elusive tenet of these developmental symbioses.
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