Annual shell growth patterns of three venerid bivalve mollusk species in the subtropical northwestern Pacific as revealed by sclerochronological and stable oxygen isotope analyses.
Annual shell growth patterns of three venerid bivalve mollusk species in the subtropical northwestern Pacific as revealed by sclerochronological and stable oxygen isotope analyses.
复制标题
通过硬化年代学和稳定氧同位素分析揭示了亚热带西北太平洋三种双壳类软体动物的年度贝壳生长模式。
DOI：
10.1007/s00227-019-3637-7
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发表时间：
2020
期刊：
影响因子：
2.4
通讯作者：
K.
中科院分区：
文献类型：
--
作者：
Tanabe;K.;Miyaji;T.;Murakami-Sugihara;N.;Shirai;K.;Moriya;K.
根据对琉球群岛南部西表岛潮间带活捕标本的硬度年代学和稳定氧同位素分析结果，研究了三种海贝类（Gafrarium pectinatum、Pitar citrinus和Katelysia japonica）的年度贝壳生长模式。在研究区域，这三个物种暂时停止贝壳沉积，当海表温度（SST）下降到23-26 °C，在前三年。然而，壳生长的停止温度在6年后略微增加到高于26 °C。栉孔扇贝生长期缩短。这些种类的壳日生长的季节变化主要受SST和初级生产力的控制。贝壳δ 18 O衍生的夏季温度记录在每年的增量比栖息地的最高SST记录高3-5 °C。这种数据不匹配可能是由于夏季和秋季台风季节附近河流的淡水流入研究区导致海水δ 18 O值突然下降所致。研究表明，在研究海域，三种贝类的贝壳年生长模式和δ 18 O值受个体发育年龄、SST、盐度和初级生产力的季节变化等生物学和环境因素的共同控制。
Annual shell growth patterns of the three venerid bivalve species,Gafrarium pectinatum,Pitar citrinus, andKatelysia japonicawere investigated based on the results of sclerochronological and stable oxygen isotope analyses of live-caught specimens from the intertidal zone of Iriomote Island, southern Ryukyu Archipelago. In the study area, these three species temporally stopped shell deposition, when sea surface temperature (SST) dropped to 23–26 °C, during the first three years. However, the shutdown temperature for shell growth increased slightly to higher than 26 °C after 6 years old forG. pectinatumcombined with a shortening in the length of shell growing period. Seasonal changes in daily shell growth in these species were controlled mainly by SST and primary production. Shell δ18O-derived summer temperatures recorded in the annual increments were higher by 3–5 °C than the highest SST records of the habitat. This data mismatch might be caused by an abrupt decrease in seawater δ18O values during the summer and fall typhoon seasons because of the influx of fresh water into the study area from nearby rivers. This study suggests that in the study area the annual shell growth patterns and shell δ18O values in the three species examined were controlled by mutually related biological and environmental factors such as ontogenetic age and seasonal changes in SST, salinity and primary production.