Annual shell growth pattern of the Stimpson's hard clam Mercenaria stimpsoni as revealed by sclerochronological and oxygen stable isotope measurements
Annual shell growth pattern of the Stimpson's hard clam Mercenaria stimpsoni as revealed by sclerochronological and oxygen stable isotope measurements
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DOI：
10.1016/j.palaeo.2016.05.016
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发表时间：
2017-01-01
影响因子：
3
通讯作者：
Tanabe, Kazushige
中科院分区：
文献类型：
--
作者：
Kubota, Kaoru;Shirai, Kotaro;Tanabe, Kazushige
斯丁普森蛤（Mercenaria stimpsoni）是受俄亥俄寒流影响的西北太平洋中高纬度沿岸沿着分布的一种浅水双壳类。由于这种动物可以活几十年，其外壳的氧同位素可能会提供长期的海水温度和盐度数据。然而，对该虫的生活史特征知之甚少。stimpsoni，这阻碍了它们在古气候学中的应用。因此，我们调查了三个活捕的M。stimpsoni个体从船越湾，特别是专注于少年个体发育阶段。硬年代学和高分辨率氧同位素分析表明，该物种的年轻（10岁以下）标本主要在春季和秋季之间生长，但在海洋表面温度降至约10摄氏度以下的寒冷季节停止生长。研究结果还表明，个体发育年龄较大（>10岁）的标本几乎只在夏季生长壳材料。在个体发育较年轻的贝壳部分的氧同位素是过去夏季温度的一个很好的指标。(C)2016爱思唯尔B.V.保留所有权利。
Mercenaria stimpsoni (Stimpson's hard clam) is a shallow-water bivalve species distributed along mid- to high latitude coasts of the Northwest Pacific influenced by the Oyashio cold current. As this animal can live for decades, oxygen isotopes of its shell can potentially provide long-term seawater temperature and salinity data. However, little is known about the life history traits of M. stimpsoni, which hampers their use in paleoclimatology. Thus, we investigated the growth patterns of three live-caught M. stimpsoni individuals from Funakoshi Bay, especially focusing on juvenile ontogenetic stages. Sclerochronological and high-resolution oxygen isotope analyses suggest that young (below age 10) specimens of this species grow predominantly between spring and fall, but ceased growing during the cold season when sea surface temperature drops below approximately 10 degrees C. The results also show that ontogenetically older (>10 yr) specimens grow shell material almost exclusively during summer. Oxygen isotopes in ontogenetically younger portions of the shells are a good indicator of past summer temperatures. (C) 2016 Elsevier B.V. All rights reserved.