Growth of Western Australian corals in the Anthropocene

Twenty-seven long cores were collected between October 2008 and September 2010 from massive Porites sp. colonies at six locations covering approximately 1000 km of the coast of Western Australia. The sampling locations included two reefs in the Rowley Shoals: Clerke Reef and Imperieuse Reef; three locations within the Ningaloo Reef Tract: Bundegi, Tantabiddi and Coral Bay; and the Houtman Abrolhos Islands.All sampled colonies were While some cores extended back to the 18th century, focus was on the period 1900-2010, which was common to the majority (70%) of cores, and provided sufficient replication at each location and overlap with instrumental SST observations. Average monthly SST were obtained from the HadISST 1.1 database, available from the British Atmospheric Data Centre.Calcification anomalies were calculated for each core as the percent difference between the annual calcification rate and the long-term average for the period 1900-2010. Calcification anomalies were then averaged for each six locations and for all 27 cores. Linear regression (Generalized Linear Model (GLM) and non-linear regression (Generalized Additive models were used to examine the influence of time, SST and location on the calcification average and anomaly data. All models were analysed using the statistical package R. This research was undertaken to:1. determine if there have been significant changes in calcification rates in coral reefs in Western Australia over time2. determine if there is any relationship between any changes calcification rates and observed changes in sea surface temperature (SST).

2008年10月至2010年9月期间，研究人员于澳大利亚西部沿岸约1000公里范围内的6个采样点，从块状微孔珊瑚（Massive Porites sp.）群落中采集了27根长岩心。采样点涵盖罗利沙洲（Rowley Shoals）的两座礁体：克拉克礁（Clerke Reef）与因佩里厄斯礁（Imperieuse Reef）；宁格鲁礁海域（Ningaloo Reef Tract）内的3处点位：邦德吉（Bundegi）、坦塔比迪（Tantabiddi）与珊瑚湾（Coral Bay）；以及豪特曼阿博罗霍斯群岛（Houtman Abrolhos Islands）。所有采样的珊瑚群落均为健康个体，部分岩心的沉积记录可追溯至18世纪，但研究重点聚焦于1900-2010年时段：该时段覆盖了70%的岩心样本，且各采样点均具备足够的重复样本量，同时与仪器观测的海表温度（Sea Surface Temperature, SST）数据集存在完整的时间重叠。

平均月尺度海表温度数据取自HadISST 1.1数据库，该数据集可从英国大气数据中心（British Atmospheric Data Centre）获取。

以1900-2010年的长期平均钙化率为基准，计算每根岩心的钙化异常值，即年钙化率与该长期平均值的百分比差值。随后分别对6个采样点及全部27根岩心的钙化异常值求取平均值。

采用线性回归（广义线性模型（Generalized Linear Model, GLM））与非线性回归（广义可加模型（Generalized Additive Models, GAM）），分析时间、海表温度与采样点位对钙化平均值及异常值数据集的影响。所有模型均通过统计软件R完成分析。

本研究旨在达成以下两项目标：
1. 探明澳大利亚西部珊瑚礁的钙化率是否随时间发生了显著变化；
2. 探明钙化率的变化与观测到的海表温度变化之间是否存在关联。

搜集汇总

背景与挑战

背景概述

该数据集由澳大利亚海洋科学研究所（AIMS）创建，包含2008年至2010年间从西澳大利亚六个地点采集的27个珊瑚岩芯数据，重点关注1900-2010年期间的钙化率变化。研究旨在分析珊瑚钙化率随时间的变化趋势，并探讨其与海表温度（SST）的关系，使用线性回归和非线性回归模型进行统计检验。