Oceanographic control on shell growth of Arctica islandica (Bivalvia) in surface waters of Northeast Iceland - Implications for paleoclimate reconstructions
Oceanographic control on shell growth of Arctica islandica (Bivalvia) in surface waters of Northeast Iceland - Implications for paleoclimate reconstructions
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DOI：
10.1016/j.palaeo.2014.12.016
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发表时间：
2015-02-15
影响因子：
3
通讯作者：
Schoene, Bernd R.
中科院分区：
文献类型：
--
作者：
Marali, Soraya;Schoene, Bernd R.
从中纬度到高纬度地区，覆盖很长时间间隔的绝对日期的、每年分辨的海表温度记录对于更好地了解气候系统至关重要。这些数据可以从长寿命的双壳类（如Arctica islandica）的壳生长变化中获得。这项研究提出了第一个统计上可靠的178年长的复合年表（涵盖1835-2012年），基于16个活采集的A。产于冰岛东北部未受污染的浅沃茨。在1875年和1996年之间，高达43%的年度壳生长的变化是由SST在2月至9月。当温度升高和食物供应增加时，生长速度会更快。然而，相关性受到强烈的时间变化。同样，序列间的相关性（时间序列间的同步性）也时强时弱。如果更均匀的环境条件在一个较长的时间间隔内占上风，栖息地只受该地区的主要电流之一-温暖，营养丰富的Irminger电流或寒冷，营养贫乏的东冰岛电流-同期标本的生长记录之间的协议打破，壳生长和SST之间的相关性是最低的。当两种海流交替作用时，贝壳生长的年际变异性最大，各样品间的生长同步性最强，SST与贝壳生长的相关性增强。结果表明，A.岛屿和环境变量非常复杂，取决于海洋学参数。这些研究结果应考虑在随后的研究，以可靠地重建SST和其他环境变量从这个物种的外壳。(C)2014爱思唯尔有限公司版权所有。
Absolutely dated, annually resolved sea surface temperature records from middle to higher latitudes covering long time intervals are crucial to better understand the climate system. Such data can potentially be obtained from variations in shell growth of long-lived bivalves such as Arctica islandica. This study presents the first statistically robust 178-yr long composite chronology (covering 1835-2012) based on sixteen live-collected and subfossil specimens of A. islandica from unpolluted, shallow waters of Northeast Iceland. Between 1875 and 1996, up to 43% of the variation in annual shell growth was explained by SST during February to September. Faster growth occurred when temperatures were warmer and food supply was elevated. However, the correlation was subject to strong temporal variations. Likewise, the inter-series correlation (synchrony among time series) was intermittently stronger and weaker. If more uniform environmental conditions prevailed over a longer time interval and the habitat was solely influenced by one of the major currents in this region - the warm, nutrient-rich Irminger Current or the cold, nutrient-poor East Iceland Current - the agreement between growth records of contemporaneous specimens broke down and the correlation between shell growth and SST was at minimum. However, when the habitat was under the alternating influence of both currents, the inter-annual variability of shell growth and synchrony in growth among the specimens were at maximum, and the correlation between SST and shell growth strengthened. As demonstrated here, the relationship between shell growth of A. islandica and environmental variables is highly complex and depends on oceanographic parameters. These findings should be taken into account in subsequent studies in order to reliably reconstruct SST and other environmental variables from shells of this species. (C) 2014 Elsevier B.V. All rights reserved.