In-situ metabolic rates of the coral Platygyra carnosa in Port Island (Hong Kong)


A 2-year monthly survey has been carried out in Port Island (Hon Kong, SAR China) from April 2018 to March 2020 to monitor the water quality conditions and assess the physiological status of coral colonies Platygyra carnosa. Physiological parameters of P. carnosa were measured using the same protocols at each deployment survey to make repeated observations of health status under natural conditions. Respiration (R) and net photosynthesis (Pn) rates were measured at the coral surfaces using an underwater respirometer (CISME Instruments LLC) following measurement and calibration protocols as previously described by Dellisanti et al. (2020; doi:10.1016/j.marpolbul.2020.111005). Daily coral energetics, as holobiont productivity, were quantified as the ratio of oxygen production through gross photosynthesis (Pg) to consumption through respiration (R) and indicated as Pg/R ratio. At the end of each light incubation, a sample of the recirculated chamber water was collected for measurement of total alkalinity (At). Rates of coral calcification (CA) were determined using the alkalinity anomaly technique (Schoepf et al., 2017; doi:10.1007/s00338-016-1507-z) normalized to the coral surface area (24.5 cm2).The photosynthetic capacity of the symbiont was measured as maximum quantum yield (Fv/Fm) using a pulse amplitude modulated (PAM) fluorometer (diving-PAM, Heinz Walz, Effeltrich, Germany) equipped with a standard glass-fiber optic probe (Ralph et al., 1999; doi:10.3354/meps180139). PAM measurements were taken on randomly selected polyps of the same coral spot where CISME was deployed after 15 min dark acclimation. Digital photographs were taken on the same coral spot for colorimetric analysis to quantify the levels of whiteness as a measure of discoloration or quantification of bleaching (Chow et al., 2016; doi:10.1016/j.jembe.2016.03.003). The whiteness value was measured as the dissimilarity percentage in colour composition between treated and control corals using the SIMPER tool of Primer 6.0 software (Primer-E Ltd).The data were used to identify the seasonal influence of water conditions on metabolism, productivity, and calcification of the coral Platygyra carnosa.

Metadata Access
Creator Dellisanti, Walter; Chung, T H Jeffery; Yiu, K F Sam; Tsang, Ryan H L; Ang, Put Jr; Yeung, H Yip; Qiu, Jian-Wen; McIlroy, E Shelby; Wells, Mark L; Wu, Jiajun; Chan, Leo L
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2021
Funding Reference National Natural Science Foundation of China, 41641047; Research Grants Council, University Grants Committee, C7013 19G; Second Institute of Oceanography, State Oceanic Administration, SOEDZZ1702; The Hong Kong University of Science and Technology, SMSEGL20SC02
Rights Creative Commons Attribution 4.0 International;
OpenAccess true
Language English
Resource Type Dataset
Format text/tab-separated-values
Size 742 data points
Discipline Life Sciences; Medicine; Medicine and Health; Physiology
Spatial Coverage (114.356 LON, 22.502 LAT); Chek Chau, Port Island, Hong Kong
Temporal Coverage Begin 2018-04-13T00:00:00Z
Temporal Coverage End 2020-03-20T00:00:00Z