Spatial variations in the stable isotope composition of the green algae, Halimeda tuna, on Conch Reef, Florida Keys, USA and implications for paleothermometry

Date 2020-07-24
Temporal extent 1997 -2006
Author(s) Stokes DaleORCID1
Affiliation(s) 1 : Scripps Institution of Oceanography, USA
DOI 10.17882/61374
Publisher SEANOE
Note Support data for PLOS ONE: Spatial variations in the stable isotope composition of the green algae, Halimeda tuna, on Conch Reef, Florida Keys, USA and implications for paleothermometry
Keyword(s) Halimeda, paleothermometry, stable isotope
Abstract

On Conch Reef, Florida Keys, USA we examine the interaction of local hydrography and the complex reef topography on the pattern of stable isotope (δ18O and δ13C) signatures in the benthic green algae, Halimeda tuna.  During the summer months, benthic temperatures show high-frequency fluctuations associated with the arrival of internal waves that advect cool, nutrient rich water across the reef slope. The nutrient and temperature regime available for H. tuna growth across the reef is modified by the interaction between local water flow and reef morphology and results in a highly heterogenous growth environment even within isobaths. This environmental heterogeneity in then reflected in the large variability in isotopic signatures even among closely located individuals. Comparing the temperature measured across the reef front with that predicted by the δ18O isotopic thermometer suggests complex interactions between the environment and Halimeda carbonate formation at temporal and spatial scales not normally considered in mixed or averaged sediment samples. The divergence in estimated temperature range between measured and predicted temperatures emphasizes species and location specific temperature relationships. The relatively light δ18O signatures, compared to other model measurements, may also indicate freshwater input at Conch Reef. These observations illustrate the need to consider this spatial heterogeneity in contemporary as well as ancient reef settings that are influenced by a similar, highly variable physical environment.

Licence CC-BY-ND
Data
File Size Format Processing Access
CRZ show coordinates 22 KB TEXTE Processed data Open access
CR Y data coordinate file 748 bytes TEXTE Processed data Open access
CR X coordinates 529 bytes TEXTE Processed data Open access
CR sigma temperatures on grid 22 KB TEXTE Processed data Open access
CR isotope data part 1 9 KB TEXTE Processed data Open access
CR isotope data part 2 3 KB TEXTE Processed data Open access
Benthic water temperature at 10, 20, 30 m on Conch Reef, Florida from 1996 to 2007 19 MB CSV Quality controlled data Open access
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How to cite 

Stokes Dale (2020). Spatial variations in the stable isotope composition of the green algae, Halimeda tuna, on Conch Reef, Florida Keys, USA and implications for paleothermometry. SEANOE. https://doi.org/10.17882/61374


In addition to properly cite this dataset, it would be appreciated that the following work(s) be cited too, when using this dataset in a publication :


Stokes M. Dale, Leichter James J., Wing Stephen R. (2020). Spatial variations in the stable isotope composition of the benthic algae, Halimeda tuna, and implications for paleothermometry. Scientific Reports, 10(1), -. https://doi.org/10.1038/s41598-020-73283-x