Institute of Oceanography and Fisheries, Split, Croatia.
Institute of Geosciences, University of Mainz, Germany.
Mar Environ Res. 2019 Sep;150:104759. doi: 10.1016/j.marenvres.2019.104759. Epub 2019 Jul 13.
Due to its outstanding longevity (decades), the shallow-water bivalve Glycmeris pilosa represents a prime target for sclerochronological research in the Mediterranean Sea. In the present study, we analyzed the microgrowth patterns and the stable carbon (δC) and oxygen (δO) isotopes of the outer shell layer of live-collected G. pilosa specimens from four different sites along the Croatian coast, middle Adriatic Sea. Combined analysis of shell growth patterns and temporally aligned δO data indicated that the main growing season lasts from April to December, with fastest growth rates occurring during July and August when seawater temperatures exceeded 22 °C. Slow growth in the cold season (<12 °C) coincided with the formation of winter growth lines on the outer shell surface. The growth cessation occurred in winter, but on the outer shell surface the brown summer bands are more pronounced than the winter lines. Mutvei-staining of cross-sections facilitated the recognition of the growth lines. δC values reflect ontogenetic changes in physiology as well as seasonal changes in primary production and salinity.
由于其出色的长寿（数十年），浅海水生双壳类贻贝 Glycmeris pilosa 是地中海骨骼年代学研究的主要目标。本研究分析了来自克罗地亚沿海四个不同地点采集的活体 G. pilosa 标本的外壳外层的微生长模式以及稳定的碳 (δC) 和氧 (δO) 同位素。外壳生长模式和时间对齐的 δO 数据的综合分析表明，主要生长季节从 4 月持续到 12 月，当海水温度超过 22°C 时，生长速度最快。在寒冷季节（<12°C）生长缓慢，与外壳表面冬季生长线的形成相对应。冬季生长停止，但在外壳表面，棕色夏季条带比冬季线更明显。横截面上的 Mutvei 染色有助于识别生长线。δC 值反映了生理学的个体发育变化以及初级生产力和盐度的季节性变化。
