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dc.contributor.authorPatil, J.S.
dc.contributor.authorAnil, A.C.
dc.date.accessioned2008-02-22T04:45:43Z
dc.date.available2008-02-22T04:45:43Z
dc.date.issued2005
dc.identifier.citationMarine ecology progress series, Vol.301; 231-245p.
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/885
dc.description.abstractNatural biofilms constitute a complex network of microorganisms (bacteria, diatoms, protozoa, fungi) and their extracellular polymeric substances (EPS), which influence settlement inbenthic invertebrates. The influence of diatom (Bacillariophyceae) films and EPS(greater than 1000 molecular weight) on metamorphosis in the acorn barnacle Balanus amphitrite Darwin, a dominant fouling organism, using axenic and non-axenic films, and free and biofilm EPS, of 5 species of pennate diatoms: Amphora coffeaeformis and A. rostrata, and Navicula transitans var. derasa f. delicatula, N. crucicula and N. subinflata are investigated. Fourier-transformed infrared spectroscopy (FTIR) spectrarevealed that the EPS produced by diatoms are of similar nature; however, the proportion of monosaccharides varies with species, indicating a potential role for influencing larval metamorphosis. Free EPS of axenic diatoms had no effect, whereas biofilm EPS induced larvae to metamorphose. Amphora spp. produced more biofilm EPS, but had relatively weaker effects than Navicula spp. Axenic diatom films also facilitated larval metamorphosis (depending on species and cell density) in some cases, suggesting that the cues provided by the diatoms themselves can also mediate invertebrate larval metamorphosis in the absence of microbial films. Non-axenic diatom films (which had higher cell densities) and biofilm EPS promoted metamorphosis to a greater degree than those of axenic diatoms. Enhancement of metamorphosis depended on diatom species and on their density in the films, as well as on the composition of their EPS. Differential responses of barnacle larvae to different diatom species and their EPS indicate that each diatom species provides a different set of physico-chemical signals to settling larvae.
dc.language.isoen
dc.publisherInter Research
dc.rightsCopyright [2005]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice by copyright holder that the rights are voilated then the item would be withdrawn.
dc.subjectbiofilms
dc.subjectmicroorganisms
dc.subjectfouling organisms
dc.subjectlarval development
dc.subjectmetamorphosis
dc.subjectbiological settlement
dc.subjectmarine crustaceans
dc.subjectBalanus amphitrite
dc.titleInfluence of diatom exopolymers and biofilms on metamorphosis in the barnacle Balanus amphitrite
dc.typeJournal Article


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