000K  utf8
1100  $c2023
1500  eng
2050  urn:nbn:de:gbv:8:3-2023-00338-9
2051  10.3389/fmars.2023.1151592
3000  Hetzinger, Steffen
3010  Ballesteros, Enric
3010  Grohganz, Madleen
3010  Halfar, Jochen
3010  Hathorne, Ed
3010  Kersting, Diego K.
4000  Elemental cycles in the coralline alga Neogoniolithon hauckii as a recorder of temperature variability in the Mediterranean Sea  [Hetzinger, Steffen]
4209  Coralline algae play important ecological roles throughout the photic zone of the world’s oceans. Recent studies have shown that attached-living coralline algae can contain records of past climate variability. So far, algal-based paleo-reconstructions are mainly available from mid- to high-latitudes, while in low latitude and temperate regions only few examples exist. Here, we investigate samples from the attached-living encrusting coralline algal species Neogoniolithon hauckii (Rothpletz) R.A Townsend & Huisman [= Neogoniolithon mamillosum (Hauck) Setchell & L.R. Mason, nom illeg.] from a temperate site in the Mediterranean Sea to assess its potential as an environmental recorder. The specimens were collected at different water depths (20 and 40 m) in the Columbretes Islands (Spain). Sclerochronological analysis of sectioned samples revealed seasonal growth patterns. Mg/Ca, Li/Ca, and Ba/Ca ratios were measured in the algal skeletons using laser ablation inductively coupled mass spectrometry (LA-ICP-MS) in ultra-high resolution. We report a mean vertical extension rate of 1.1 to 1.2 mm/year (based on analysis of Mg/Ca cycles in 40 m and 20 m samples), representing the first growth rate measurement for this species. In addition, subannual banding patterns were mapped, measured, and could be linked to high frequency variability in laser-analyzed Mg/Ca ratios. Elemental ratios analyzed in Neogoniolithon hauckii were compared to in situ water temperatures measured at the water depth of sample collection. Our results show significant positive relationships between algal Mg/Ca (R=0.55) as well as Li/Ca ratios (R=0.46) and in situ measured temperature data (40 m specimen). Further calibration studies are needed to test the element-temperature relationships on samples with longer growth records and in different settings and water depths.
4950  https://doi.org/10.3389/fmars.2023.1151592$xR$3Volltext$534
4950  https://nbn-resolving.org/urn:nbn:de:gbv:8:3-2023-00338-9$xR$3Volltext$534
4961  https://macau.uni-kiel.de/receive/macau_mods_00003659
5051  333.7
5550  archive
5550  climate
5550  coralline algae
5550  LA-ICP-MS,
5550  Li/Ca
5550  Mg/Ca
5550  sclerochronology
5550  subannual banding
5550  temperate