Rosenheim, B.E.; Swart, P.K.; Thorrold, S.R.; Willenz, P.; Berry, L.; Latkoczy, C. (2004). High-resolution Sr/Ca records in sclerosponges calibrated to temperature in situ. Geology. 32(2): 145-148.

450881

10.1130/g20117.1 [view]

Rosenheim, B.E.; Swart, P.K.; Thorrold, S.R.; Willenz, P.; Berry, L.; Latkoczy, C.

2004

32(2): 145-148

Publication

Available for editors   [request]

Ratios of strontium to calcium have been analyzed by laserablation inductively coupled plasma–mass spectrometry (LA-ICPMS) in a skeletal section of the sclerosponge Ceratoporella nicholsoni. The growth period, representative of 3 yr, was stained in the skeleton with a fluorochrome (calcein). Temperatures were recorded at 2 h intervals within the shallow, cryptic reef enclosure that the sclerosponge inhabited on the northern coast of Jamaica, allowing the formulation of a direct empirical relationship between Sr/Ca and temperature. To verify this calibration, Sr/Ca ratios of two sclerosponges of the same species from depths of 67 m and 136 m in Exuma Sound, Bahamas, were analyzed by LA-ICP-MS and compared to the temperatures from these depths over a decade prior to collection. The result is an independently verified, highresolution empirical calibration for the temperature sensitivity of Sr/Ca ratios in the aragonite skeletons of sclerosponges from Jamaica and the Bahamas. The calibration is a first for C. nicholsoni and indicates that sclerosponges are more sensitive temperature recorders than zooxanthellate corals. It represents an important step in establishing skeletal geochemistry of sclerosponges as a proxy of temperature in the upper 250 m of the ocean.

Caribbean region

Porifera

RIS (EndNote, Reference Manager, ProCite, RefWorks)
BibTex (BibDesk, LaTeX)

[Back to search]