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