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• W2022156589 abstract "AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials AME 49:71-85 (2007) - DOI: https://doi.org/10.3354/ame01129 Relationship of variable chlorophyll fluorescence indices to photosynthetic rates in microphytobenthos João Serôdio*, Sónia Vieira, Filipe Barroso Departamento de Biologia & CESAM—Centro de Estudos do Ambiente e do Mar, Universidade de Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal *Email: jserodio@ua.pt ABSTRACT: The present study investigated the use of indices based on variable chlorophyll fluorescence for the estimation of rates of photosynthesis by microphytobenthos. The relationship between fluorescence indices and photosynthesis, as measured on intact sediment samples, was studied (1) theoretically, using a simulation model to analyse the effects of light attenuation, biomass profile and depth integration, and (2) experimentally, by obtaining a comprehensive dataset of paired measurements of photosynthesis (oxygen microsensors) and fluorescence (PAM fluorometry) along hourly, 14 d and seasonal time scales, at 2 estuarine intertidal sites with distinctive sediment characteristics. Depth-integrated photosynthesis (P) was compared to EFY, an index based on depth-integrated fluorescence parameters estimating the productive biomass (minimum fluorescence, F0) and the Photosystem II effective quantum yield (ΔF/Fm’). Whilst numerical simulations have indicated that the relationship between EFY and P can be conditioned by the vertical distribution of biomass, the experimental data showed EFY to closely trace variations in P in a wide range of light conditions, vertical distribution of productivity, sediment characteristics, and taxonomic composition of the microalgal community. A linear relationship between EFY and P was generally found, both when considering each day separately (significant correlations in 94.3% of the days) and when different days within each sampling period were pooled together (significant correlations in all cases). The slopes of the regression equations of EFY on P were found to vary throughout the year, indicating that the practical use of the index may require the frequent determination of conversion factors. Nevertheless, the use of this fluorescence index was confirmed to represent a valid methodology for the rapid and non-destructive estimation of photosynthetic rates in microphytobenthos. KEY WORDS: Microphytobenthos · Photosynthesis · PAM fluorescence · Depth integration · Primary production · PSII electron transport · Benthic microalgae · Biofilms Full text in pdf format PreviousNextCite this article as: Serôdio J, Vieira S, Barroso F (2007) Relationship of variable chlorophyll fluorescence indices to photosynthetic rates in microphytobenthos. Aquat Microb Ecol 49:71-85. https://doi.org/10.3354/ame01129 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AME Vol. 49, No. 1. Online publication date: October 16, 2007 Print ISSN: 0948-3055; Online ISSN: 1616-1564 Copyright © 2007 Inter-Research." @default.
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• W2022156589 date "2007-10-16" @default.
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• W2022156589 title "Relationship of variable chlorophyll fluorescence indices to photosynthetic rates in microphytobenthos" @default.
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