Comparison of climate signals obtained from encrusting and free-living rhodolith coralline algae
Comparison of climate signals obtained from encrusting and free-living rhodolith coralline algae
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从结壳珊瑚藻和自由生活的红榴石珊瑚藻获得的气候信号的比较
DOI：
10.1016/j.chemgeo.2017.11.038
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发表时间：
2018
期刊：
影响因子：
3.9
通讯作者：
Juul-Pedersen
中科院分区：
文献类型：
--
作者：
Williams;Halfar;Hetzinger;Blicher;Juul-Pedersen
在过去的十年里，珊瑚藻类一直被用于菌体年代学研究。这些研究侧重于光合作用珊瑚藻类的两种不同生长形态：在坚硬的底物上形成小结壳的巨大结壳，以及被称为红藻的自由生活的分枝藻类结节。后者通常发现在软基上，在那里它们经常被水运动和底部进食生物倾覆，在任何给定的时间都会留下部分埋藏在沉积物中的红柱石的一侧。在这里，我们测试这两种生长形态中的任何一种更适合于代理重建，通过比较多个重复的石羊草冰川和红柱石中的镁/钙比-温度代理-以及致密红藻的包壳标本。由于这两个物种在温带和北极地区分布广泛，我们选择了格陵兰努克峡湾(亚北极区)和加拿大纽芬兰东南海岸(温带区)的两个北大西洋地点进行本研究。利用激光烧蚀电感耦合质谱仪，对红柱石不同侧面和具有结壳形态的多个样品18年的生长过程中的两到三个镁/钙比断面进行了分析，并与遥感海表面温度(SST)数据进行了比较。用于比较的共同时间跨度的长度受到红柱藻生长中断的限制。此外，我们的比较是基于这样的假设，即红柱石的生长增量是每年的-这一假设最近受到了中观研究的挑战。比较了每个个体内多个横断面的每月镁/钙比值，在努克峡湾的样本中，4个结块C中有4个发现了显著的相关性。致密，4C中的4个。和3升的2株。冰川冰川。在纽芬兰，6例结垢C中有6例有显著相关性。紧凑型比较(平均值：R=0.61，P=0.001)，6个月中有6个。月度分辨时间序列的冰川警报霍多利斯比较(平均值：R=0.43，P<；0.001)。将每个形态的每月镁/钙比(n=1216)与仪器雷诺SST进行比较，得到以下相关性：结壳C。紧凑型(r=0.64，p；t；0.001)、致密型(r=0.62，p；t；0.001)和L.冰川(r=0.58，p；t；0.001)。在纽芬兰，两种形态都表明记录SST的强度相似：结壳C。致密(r=0.85，p；t；0.001)和红柱石形成。冰川(r=0.84，p；t；=0.001)。总而言之，从两种珊瑚藻类生长形式获得的镁/钙比可以获得SST信息，然而，块状结壳形式与SST的相关性通常高于在单个红藻上测量的横断面，后者只允许由于频繁的生长不规则而产生短而不间断的时间序列。
Coralline algae have been used for sclerochronological studies throughout the last decade. These studies have focused on two different growth morphologies of the photosynthetic coralline algae: massive crusts forming small buildups on hard substrate, and free-living branching algal nodules, known as rhodoliths. The latter are generally found on soft-substrate, where they are frequently overturned by water movement and bottom feeding organisms, leaving one side of the rhodolith partially buried in the sediment at any given time. Here we test whether either of these growth morphologies is more suitable for proxy reconstructions by comparing Mg/Ca ratios – a temperature proxy – in multiple replicates of rhodoliths ofLithothamnion glacialeand in rhodoliths as well as encrusting specimens ofClathromorphum compactum. With both species being widespread throughout the Temperate and Arctic regions, we have chosen two North Atlantic localities at Nuuk Fjord, Greenland (Subarctic), and off the southeastern coast of Newfoundland, Canada (Temperate), for this study. Two to three Mg/Ca ratio transects spanning 18 years of growth were analysed on multiple specimens with encrusting morphologies and along different sides of rhodoliths using laser ablation inductively coupled mass spectrometry and compared to remotely sensed sea surface temperature (SST) data. The length of the common time span used for comparison was limited by growth interruptions in rhodoliths. Furthermore, our comparison is based on the assumption that rhodolith growth increments are annual – an assumption that has recently been challenged by mesocosm studies. Monthly Mg/Ca values from multiple transects within each individual were compared and in samples from Nuuk fjord significant correlations were found in 4 of 4 encrustingC. compactum, 4 of 4C. compactumrhodoliths, and 2 of 3L. glacialerhodoliths. In Newfoundland significant correlations were found in 6 of 6 encrustingC. compactumcomparisons (average: r = 0.61, p < 0.001), and in 6 of 6L. glacialerhodolith comparisons (average: r = 0.43, p < 0.001) for monthly resolved time series. The monthly Mg/Ca ratios (n = 216) from each morphology were compared with instrumental Reynolds SST yielding the following correlations: encrustingC. compactum(r = 0.64, p < 0.001),C. compactumrhodolith (r = 0.62, p < 0.001) andL. glaciale(r = 0.58, p < 0.001). In Newfoundland both morphologies indicate a similar strength in recording SST: encrustingC. compactum(r = 0.85, p < 0.001) and rhodolith-formingL. glaciale(r = 0.84, p < 0.001). In summary, Mg/Ca ratios derived from both coralline algal growth forms can yield SST information, however, massive encrusting forms generally yield higher correlations to SST than transects measured on individual rhodoliths, which only allowed for the generation of short uninterrupted time series due to frequent growth irregularities.
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影响因子：
1.7
作者：
Jorgensbye, Helle I. O.;Halfar, Jochen
通讯作者：
Halfar, Jochen
DOI：
10.1016/j.palaeo.2013.05.029
发表时间：
2013-09
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
D. Reynolds;P. Butler;Siobhan Williams;J. Scourse;C. Richardson;A. Wanamaker;W. Austin;A. Cage;M. Sayer
通讯作者：
D. Reynolds;P. Butler;Siobhan Williams;J. Scourse;C. Richardson;A. Wanamaker;W. Austin;A. Cage;M. Sayer
影响因子：
16.6
作者：
Chan P;Halfar J;Adey W;Hetzinger S;Zack T;Moore GWK;Wortmann UG;Williams B;Hou A
通讯作者：
Hou A
影响因子：
5.8
作者：
Halfar, J.;Steneck, R. S.;Wanamaker, A. D., Jr.
通讯作者：
Wanamaker, A. D., Jr.
影响因子：
3.6
作者：
Halfar, J;Zack, T;Zachos, JC
通讯作者：
Zachos, JC