![]() Depth was associated with a significant decrease in Symbiodinium density, and δ 13C values in macroalgae.Ĭonclusions: We attribute these findings to Symbiodinium from S. δ 15N values of Symbiodinium from Stylophora pistillata and macroalgae did not change with depth. However, chlorophyll- a and Symbiodinium density from Montipora stellata had higher concentrations on the southern side of the island. Key results: δ 15N values showed a uniform nutrient profile across primary producers. ![]() δ 15N and δ 13C stable isotope values were assessed for Symbiodinium relative to cell density per surface area. Methods: Coral fragments and macroalgae were collected at depths from the surface to 26 m. This variation causes changes in basal stable isotopes as photosynthetic and nutrient pathways change.Īims: This study provides a preliminary baseline of nitrogen (δ 15N) and carbon (δ 13C) stable isotope profiles in Symbiodinium and macroalgae at a spatial scale and along a depth gradient around an island. Context: Primary production on coral reefs varies under changing conditions such as light and nutrient availability.
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