{"refrec":{"BRefID":69185,"RR":"<b>Runcie, J.W.; Durako, M.J.</b> (2004). Among-shoot variability and leaf-specific absorptance characteristics affect diel estimates of in situ electron transport of <i>Posidonia australis</i>. <i>Aquat. Bot. 80(3)</i>: 209-220. <a href=\"https://dx.doi.org/10.1016/j.aquabot.2004.08.001\" target=\"_blank\">https://dx.doi.org/10.1016/j.aquabot.2004.08.001</a>","BEntID":65341,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Aquat. Bot. 80(3)</i>: 209-220. <a href=\"https://dx.doi.org/10.1016/j.aquabot.2004.08.001\" target=\"_blank\">https://dx.doi.org/10.1016/j.aquabot.2004.08.001</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Runcie, J.W.; Durako, M.J.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Runcie, J.W.; Durako, M.J.","Englishabstract":"Electron transport rate (ETR) calculations require values of irradiance, effective quantum yield of chlorophyll fluorescence (ΔF/F′<sub>m</sub>), the distribution of energy between PSII and PSI and leaf-specific photosynthetic absorptance. We conducted virtually simultaneous replicated measurements of diel changes in ΔF/F′<sub>m</sub> of <i>Posidonia australis</i> in situ, and determined leaf-specific photosynthetic absorptance in vivo using integrating spheres. Leaf-specific non-photosynthetic and photosynthetic absorptance, corrected for spectral reflectance, comprised 16 and 68% of total spectral absorptance (84%); about 7% of photosynthetically active radiation incident on the leaves was reflected. Virtually simultaneous quantum-yield measurements of eight short shoots provided an estimate of among-sample variability in ΔF/F′<sub>m</sub>: generally the standard deviation was ~10% of the mean except for a few hours around midday when the variability rose to ~25% of the mean. Our results indicate that leaf-specific non-photosynthetic absorptance, spectral reflectance and shoot-to-shoot variability need to be taken into account when estimating ETR in the field","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Among-shoot variability and leaf-specific absorptance characteristics affect diel estimates of in situ electron transport of <i>Posidonia australis</i>","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-18 01:31:19.641122","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"absorptance; chlorophyll fluorescence; electron transport rate;Posidonia australis","OtherDescriptors":"Absorptance; Chlorophyll fluorescence; Electron transport rate; Posidonia australis","Notes":null,"AnaPub":2004,"MonPub":null,"DateUpdate":"2020-10-06","DateCreate":"2005-01-04","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000225983300004","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.aquabot.2004.08.001"},"refs":null,"anarec":{"AnaID":69185,"PubliDate":2004,"Pagination":"209-220","XtraPublOfAnaID":null,"ISBN":null,"Volume":"80","Issue":"3","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42195,"SerRR":"Aquatic Botany. 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