{"refrec":{"BRefID":8753,"RR":"<b>Neely, M.B.</b> (2000). Somatic, respiratory, and photosynthetic responses of the seagrass <i>Halodule wrightii</i> to light reduction in Tampa Bay, Florida including a whole plant carbon budget, <b><i>in</i></b>: Bortone, S.A. (Ed.) <i>Seagrasses: monitoring, ecology, physiology, and management.</i> pp. 33-48","BEntID":8753,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":", <b><i>in</i></b>: Bortone, S.A. (Ed.) <i>Seagrasses: monitoring, ecology, physiology, and management. CRC Marine Science Series,</i> 16: pp. 33-48","DocTypID":17,"DocType":"Book chapters","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Neely, M.B.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Neely, M.B.","Englishabstract":"Treatment plots (1.5 m<sup>2</sup>) within a shallow, monospecific seagrass bed of <i>Halodule wrightii</i> (Aschers.) located off Mullet Key (Fort DeSoto Park), Pinellas County, Florida, were subjected to <i>in situ</i> light reductions of 43, 60, and 86% from September 1994 to early March 1995 and compared with control plots for changes in morphology and photosynthesis vs. irradiance (PE) response. Winter die-back caused a 50% reduction in biomass and shoot density in control plots between September and February/March. A further reduction in total and non-photosynthetic biomass of 50% compared to control occurred as a result of treatment effect regardless of the amount of light reduction. However, reduction in photosynthetic biomass was related to the amount of light reduction (r<sup>2</sup> = 0.89). There was an inverse relationship between light reduction and shoot number (r<sup>2</sup> = 0.98). Leaves on shoots within the 43% light reduction plots were longer than leaves on shoots in either control or other light reduction treatment plots after the second month of the experiment. This is probably a morphological response to light reduction, as reported for other species. Respiration and PE responses (alpha, P<sub>MAX</sub>, I<sub>C</sub>, and I<sub>K</sub>) and leaf chlorophyll content in <i>H. wrightii</i> were variabIe and did not exhibit trends related to light reduction. The I<sub>CPLANT</sub> values ranged from 30 to 100 µEm<sup>-2</sup>s<sup>-l</sup>, and averaged 39 to 62 µEm<sup>-2</sup>s<sup>-l</sup>. This corresponds to approximately 4.5-7% of surface irradiance (SI) in September and February/March, respectively, in Tampa Bay. Carbon budget calculations, using the H<sub>SAT</sub> model and accounting for water column attenuation and shade in the treatments, indicate net areal productivity by <i>H. wrightii</i> in control plots was 0.25 g C m<sup>-2</sup>d<sup>-l</sup>, and in 43% light reduction plots was 0.025 g C m<sup>-2</sup>d<sup>-l</sup>, in September. Other light reduction treatments were at a carbon deficit in September, and all treatments and controls were at a carbon deficit in February/March. These deficits explain the loss of biomass as a result of winter die-back and with a > 60% reduction in light. The discrepancy between the morphological changes that occurred in <i>H. wrightii</i> as a result of a 43% light reduction and a calculated positive carbon budget suggest that other somces of light attenuation (epiphytes, surface scattering, etc.) must be accounted for, or it may reflect carbon budget precision or assumptions.","AbstractOtherLang":null,"BibLvlCode":"AMS","StandardTitle":"Somatic, respiratory, and photosynthetic responses of the seagrass <i>Halodule wrightii</i> to light reduction in Tampa Bay, Florida including a whole plant carbon budget","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2025-07-08 01:30:37.361719","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2000,"MonPub":null,"DateUpdate":"2001-05-18","DateCreate":"2001-05-10","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":8753,"PubliDate":2000,"Pagination":"33-48","XtraPublOfAnaID":null,"ISBN":"0-8493-2045-3","Volume":"16","Issue":null,"BRefMon":8750,"BRefMonRR":"<b>Bortone, S.A. (Ed.)</b> (2000). Seagrasses: monitoring, ecology, physiology, and management. <i>CRC Marine Science Series</i>, 16. CRC Press: Boca Raton. ISBN 0-8493-2045-3. 318 pp.","BRefXtra":null,"BRefXtraRR":null,"SerBRefID":8195,"SerRR":"<b>Kennish, M.J.; Lutz, P.L. (Ed.)</b> CRC Marine Science Series.","StandardTitleSer":"CRC Marine Science Series","ISSN":null,"AbbrevSer":null,"StandardTitleMon":"Seagrasses: monitoring, ecology, physiology, and management","StartPage":33,"Pages":16,"ToPubliDate":null,"BRefBibLvlCode":"MS","SerNotes":null,"AutString":"Bortone, S.A. 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