Response of a Benthic <i>Sargassum</i> Population to Increased Temperatures: Decline in Non-Photochemical Quenching of Chlorophyll a Fluorescence (NPQ) Precedes That of Maximum Quantum Yield of PSII.

ABSTRACT: Sargassum is an important primary producer of rocky bottom communities in coastal ecosystems. Like other parts of the planet, benthic populations of S. natans from Ilha Grande Bay (IGB), southeastern Brazil, have been suffering from different forms of natural and anthropogenic disturbances, in particular increasing seawater temperatures. The aim of this study was to understand the effects of temperature on the photosynthetic performance of S. natans using the pulse amplitude modulated (PAM) fluorometry. In the field experiments, the occurrence of photoprotection resulted in a difference between the effective and maximum quantum yields [(ΔF (F'_m - F_s)/F'_m and F_v/F_m, respectively) that was maximized at

SUBMITTER: Chaloub RM 

PROVIDER: S-EPMC11901439 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature