Temperature, salinity, and fluorescence of seawater collected from Alamitos Bay, Long Beach, CA during 2017-2019

<p><strong>Study summary:</strong><br /> In this study of food limitation in the sand dollar&nbsp;<em>Dendraster excentricus</em>, we attempted to constrain estimates of the chl a boundary between food-limited and food-unlimited growth by carrying out experiments in nearshore coastal waters of southern California, which frequently have chl a levels &gt;2 ugL-1. We reared larvae in the laboratory in natural seawater collected from the field, as well as in reduced and supplemented food treatments created from this natural seawater. To supplement this investigator-generated variation in food level, we repeated this experiment six times over the course of two years to take advantage of temporal variation in chl a. Within experiments, we assessed whether larvae were food limited by looking both for evidence of food-level induced phenotypic plasticity, and by generating population-level estimates of time to metamorphic competence.</p> <p>This dataset contains temperature, salinity, and fluorescence of the seawater collected for experiments.</p><p><strong>研究概述：</strong><br /> 本研究针对偏心砂盾海胆（<em>Dendraster excentricus</em>）的食物限制效应展开实验，旨在限定食物限制生长与非食物限制生长之间的叶绿素a（chl a）浓度阈值。实验在南加州近岸海域开展，该海域的叶绿素a浓度通常高于2 μg·L⁻¹。本研究采用野外采集的天然海水在实验室中培养幼虫，同时基于该天然海水设置了食物浓度降低组与食物浓度添加组。为丰富食物浓度的梯度变量，我们在两年内重复开展了6次实验，以利用叶绿素a浓度的时间变异特征。在每次实验中，我们通过两种方式评估幼虫是否受食物限制：一是观测食物浓度诱导的表型可塑性证据，二是估算种群达到变态准备态的时间。</p> <p>本数据集包含实验所用海水的温度、盐度与荧光强度数据。</p>