Mesophotic corals in Hawaii maintain autotrophy to survive low-light conditions: Stable isotope dataset

In mesophotic coral ecosystems, reef-building corals and their photosynthetic symbionts can survive with less than 1% of surface irradiance. How depth-specialist corals rely upon autotrophically and heterotrophically-derived energy sources across the mesophotic zone remains unclear. We analyzed the stable carbon (δ13C) and nitrogen (δ15N) isotope values of a Leptoseris community from the Ê»AuÊ»au Channel, Maui, HawaiÊ»i (65-125 m) including four coral host species living symbiotically with three algal haplotypes. We characterized the isotope values of hosts and symbionts across species and depth to compare trophic strategies. Symbiont δ13C was consistently 0.5‰ higher than host δ13C at all depths. Mean colony host and symbiont δ15N differed by up to 3.7‰ at shallow depths and converged at deeper depths. These results suggest that both heterotrophy and autotrophy remained integral to colony survival across depth. The increasing similarity between host and symbiont δ15N at deeper depths sugg..., , , # Mesophotic corals in HawaiÊ»i maintain autotrophy to survive low-light conditions: Stable Isotope Dataset The complete collection of files used by Backstrom *et al.* (2024) to organize and analyze all stable isotope data presented in this research article. ## Description of the data and file structure The data are organized into three separate files, accompanied by an R script for processing/analyzing all biplot data: 1. A Microsoft Excel document (titled \"ProcB Manuscript Data CHB 1.15.24\") provides a metadata sheet outlining the organized data on all subsequent sheets. These sheets were used to process/analyze all regression data via JMP Pro 14. Outliers as defined and listed in the sheet (and tabulated in Supplementary Table 1) were excluded for analyses pertaining to those data. 2. A .csv file titled \"leptoseris.all.csv,\" reorganizing the stable isotope data for the whole sample set only by colony fraction (i.e., host vs. symbiont) to plot and run SIBER analyses. 3. Anot...# 夏威夷中光珊瑚通过维持自养以适应弱光环境：稳定同位素数据集 在中光珊瑚生态系统（mesophotic coral ecosystems）中，造礁珊瑚与其光合共生体仅需不足表层1%的辐照度即可存活。目前，深度特化珊瑚在中光带如何依赖自养与异养来源的能量仍未明确。本研究对采自夏威夷毛伊岛奥奥水道（ʻAuʻau Channel，65~125米水深）的柔珊瑚属（Leptoseris）群落的稳定碳（δ¹³C）与氮（δ¹⁵N）同位素值进行了分析，该群落包含4种与3种藻类单倍型共生的珊瑚宿主物种。研究对不同物种与不同深度下的宿主及共生体的同位素值进行了表征，以对比其营养策略。结果显示，所有深度下共生体的δ¹³C值始终比宿主高0.5‰；浅水区宿主与共生体的平均δ¹⁵N值最大相差3.7‰，而深水区两者数值趋于一致。上述结果表明，异养与自养均为各深度水层中珊瑚群落存活的必要途径。深水区宿主与共生体δ¹⁵N值的相似度随深度增加而升高，这表明…… 本数据集为Backstrom等人（2024）用于整理、分析本文中所有稳定同位素数据的完整文件集合。 ## 数据与文件结构说明 本数据集包含三个独立文件，并附带用于处理、分析所有双标图数据的R脚本： 1. 一份名为"ProcB Manuscript Data CHB 1.15.24"的Microsoft Excel（微软Excel）文档，内含一份元数据表，用于概述后续所有工作表中的整理后数据。该工作表组通过JMP Pro 14处理并分析所有回归数据。本研究针对相关数据开展分析时，已剔除文档中定义并列出的异常值（详见补充表1）。 2. 一份名为"leptoseris.all.csv"的逗号分隔值（.csv）文件，仅按珊瑚组分（即宿主与共生体）对全样本集的稳定同位素数据进行重新整理，用于绘图及开展SIBER分析。 3. 一份未完整展示的文件（原文此处截断）。