Exposure to sediment enhances primary acquisition of Symbiodinium by asymbiotic coral larvae

摘要: Many symbiotic marine invertebrates acquire free-living Symbiodinium from the envi- ronment. Abundance and diversity of could influence recovery bleaching, resilience, long-term adaptation host organisms. Although Symbio- dinium have been detected in water column substrates coral reefs, their availability to hosts are poorly understood. Tank experiments were conducted test whether asymbiotic larvae Acropora monticulosa acquired or sediment become symbiotic. Treatments included filtered (0.22 µm) seawater (FSW), unfiltered (SW), FSW sediment, SW sediment. Our results showed that greater proportions sediment-containing treatments earlier had hospite densities when compared seawater-only treatments. Addition- ally, clade A was only recovered treat- ments, whereas clades B C all Differences distribution, abun- dance, replication motility patterns Symbiodinium, as well larval behavior, may contributed observed differences between uptake column. However, our suggest represent an important source available for during primary acquisition by larvae.