Amoebocytes facilitate efficient carbon and nitrogen assimilation in the Cassiopea Symbiodiniaceae symbiosis

Niclas Heidelberg Lyndby, Nils Rädecker, Sandrine Bessette, Louise Jensen, Stéphane Escrig, Erik Trampe, Michael Kühl & Anders Meibom
The upside-down jellyfish Cassiopea engages in symbiosis with photosynthetic microalgae that facilitate uptake and recycling of inorganic nutrients. In contrast to most other symbiotic cnidarians, algal endosymbionts in Cassiopea are not restricted to the gastroderm but are found in amoebocyte cells within the mesoglea. While symbiont-bearing amoebocytes are highly abundant, their role in nutrient uptake and cycling in Cassiopea remains unknown. By combining isotopic labelling experiments with correlated SEM and NanoSIMS imaging, we quantified the...
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