Seasonal ecophysiology of Fucus vesiculosus (Phaeophyceae) in the Northern Baltic Sea

This dataset contains ecophysiological measurements of brown algae Fucus vesiculosus and environmental variables, measured in different seasons in 2017 in the Northern Baltic Sea, SW Finland. More specifically, the measured parameters include in situ chlorophyll a fluorescence: Fv/Fm, maximum relative electron transport rate, and quantum yield of photochemistry. Carbon and nitrogen content, carbon:nitrogen ratio and chlorophyll a and c content were determined in the laboratory. Environmental parameters monitored include in situ irradiance, temperature, salinity, alkalinity, DIC, pCO2, HCO3-, CO32-, CO2, seawater nitrogen (NO2- and NO3-) and phosphorus (PO43-). Measurements were conducted in February, May, July, September and November in two sites, with additional three sites sampled in July. Irradiance was measured with 1 meter depth intervals from the surface. Irradiance values in the data are irradiances at F. vesiculosus sampling depths in each site, estimated with linear regression from the irradiance and depth data. Fv/Fm values for sites Spikarna, Ekö and Björnholmen in July were imputed from other variables using R package "Amelia".本数据集收录了2017年于芬兰西南部波罗的海北部不同季节采集的褐藻囊链藻（Fucus vesiculosus）生理生态实测数据与环境变量数据。具体而言，实测参数包含两类：其一为原位（in situ）叶绿素a荧光相关指标，包括最大光化学量子产量Fv/Fm、最大相对电子传递速率以及光化学量子产额；其二为实验室测定的碳氮含量、碳氮比以及叶绿素a、叶绿素c的含量。监测得到的环境参数涵盖原位辐照度、水温、盐度、碱度、溶解无机碳（DIC）、二氧化碳分压（pCO2）、碳酸氢根离子（HCO3-）、碳酸根离子（CO32-）、溶解态二氧化碳（CO2）、海水中的氮类（以NO2-与NO3-计）以及磷酸盐（以PO43-计）。本次测量于2017年2月、5月、7月、9月及11月开展，共设置2个常规采样点，7月额外新增3个采样点进行补充采样。辐照度采用从表层开始以1米深度间隔的方式进行测定，数据中收录的辐照度值为各采样点囊链藻采样深度处的实际辐照度，通过结合辐照度与深度数据经线性回归估算得到。7月采样期间，Spikarna、Ekö及Björnholmen三个采样点的Fv/Fm值采用R语言包"Amelia"，基于其余变量完成插补。