Data from long-term study into the effects of temperature and pH stressors on Antarctic sea urchin, Sterechinus neumayeri

This data was gathered to study the effects of combined environmental stressors of lowered pH and increased temperature on the adult metabolism and larval development of the Antarctic sea urchin, S. neumayeri. Specimens were cultured under the combined environmental stressors of lowered pH (-0.3 and -0.5 pH units) and increased temperature (+2 degrees C). The experiment took place over a two-year period, from June 2009, covering two full reproductive cycles of this species.
The dataset is divided into adult and offspring. Data for adult S. neumayeri are given at four-monthly intervals. Values provided include oxygen consumption (umols), whole animal wet and dry mass (g), test diameter and thickness (mm), gonad wet and dry tissue mass (g), AFDM (Ash-Free Dry Mass) (g), CaCO3, and gonad index (GI%).
Mean frequencies are also provided for larval development stages (%) for 25-day-old S. neumayeri offspring. These offspring are derived from larval cultures spawned after 6 and 17 months exposure to altered pH and temperature conditions. Postoral arm length measurements for the most advanced larvae is also provided as a metric of skeletal development.
Two tables relating to seawater chemistry measurements are also provided. Table 1 displays mean water parameters in the adult S. neumayeri microcosm over the course of the experiment. Supplementary Table 1 gives mean seawater parameters of the S. neumayeri larval cultures derived from parents pre-exposed to low temperature and high temperature seawater controls and lowered carbonate conditions.

本数据集旨在探究pH降低与温度升高的复合环境胁迫对南极海胆（S. neumayeri）成体代谢及幼体发育的影响。实验对象在pH降低（-0.3与-0.5 pH单位）、温度升高（+2℃）的复合环境胁迫条件下培养。实验周期长达两年，自2009年6月起实施，覆盖该物种的两个完整生殖周期。
数据集分为成体与子代两部分。成体S. neumayeri的监测数据按每四个月一次的间隔采集，记录指标包括耗氧量（微摩尔，umols）、整体动物湿重与干重（克）、壳径与壳厚（毫米）、生殖腺湿重与干重（克）、无灰分干重（Ash-Free Dry Mass，AFDM，克）、碳酸钙（CaCO3）含量以及生殖腺指数（GI%）。
此外还提供了25日龄S. neumayeri子代的幼体发育阶段平均频率（%）。该批次子代源自亲体分别在暴露于改变的pH与温度条件6个月和17个月后产卵培育的幼体培养体系。同时提供了发育最先进幼体的口后臂长测量数据，作为骨骼发育的衡量指标。
本次数据集还包含两张与海水化学测量相关的表格：表1展示了实验期间成体S. neumayeri微宇宙培养体系（microcosm）内的平均水体参数；补充表1则给出了亲体预暴露于低温、高温海水对照组以及低碳酸盐条件下培育的S. neumayeri幼体培养体系的平均海水参数。