{"refrec":{"BRefID":57435,"RR":"<b>Gilpin, L.C.; Davidson, K.; Roberts, E.</b> (2004). The influence of changes in nitrogen: silicon ratios on diatom growth dynamics. <i>J. Sea Res. 51(1)</i>: 21-35. <a href=\"http://dx.doi.org/10.1016/j.seares.2003.05.005\" target=\"_blank\">http://dx.doi.org/10.1016/j.seares.2003.05.005</a>","BEntID":55022,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>J. Sea Res. 51(1)</i>: 21-35. <a href=\"https://dx.doi.org/10.1016/j.seares.2003.05.005\" target=\"_blank\">https://dx.doi.org/10.1016/j.seares.2003.05.005</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Gilpin, L.C.; Davidson, K.; Roberts, E.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Gilpin, L.C. <i>et al.</i>","Englishabstract":"Nitrate loading to coastal waters has increased over recent decades while silicon loading has remained relatively constant or decreased. As the N:Si ratio in coastal waters shifts due to these anthropogenic influences, silicate limitation of diatom biomass may become a feature of the biogeochemistry in coastal waters especially in regions of reduced exchange. Two sets of nutrient enrichment mesocosm experiments were conducted in successive years using a natural planktonic assemblage obtained from the Trondheimsfjord, Norway. The inorganic nutrient concentrations at the start of the experiments were manipulated to give a variety of N:Si concentrations at ratios representative of current and possible future values, should N loading continue. In June 1999 experiments were conducted with a gradient of inorganic N:Si ratios (1:2, 1:1, 2:1, 4:1) to investigate the influence of low and high N:Si ratio conditions and to determine the conditions that would generate Si limitation of diatom growth. In June 2000, based on 1999 data, highly replicated experiments were conducted at N:Si ratios of 1:1 and 4:1 which were expected to result in N and Si limitation of diatom growth, respectively; statistical differences in cellular composition were recorded. N limitation of diatom biomass increase was observed under the three lowest N:Si ratios: particulate carbon (C) accumulation continued to occur following N exhaustion resulting in an increase in the organic C:N ratio. Silicate limitation of diatom biomass increase only occurred at the highest N:Si ratio of 4:1. Silicate exhaustion was followed by continued nitrate uptake for several days, at a slower rate than previously. The resulting increase in organic N was accompanied by an increase in organic C such that the C:N ratio of the organic material at the highest N:Si ratio failed to increase to the extent observed under the N limited conditions. Statistically significant differences in chlorophyll-a yield per unit nitrate, C:chlorophyll-a ratios, C:N ratio and diatom cell yield per unit nitrate or Si were observed in Si compared to N limited conditions. All mesocosms became dominated numerically and in terms of biomass by the diatom Skeletonema costatum. The potential implications of changing N and Si regimes in coastal waters are discussed.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"The influence of changes in nitrogen: silicon ratios on diatom growth dynamics","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"nitrate : silicon ratios; N : Si; diatorns; C : N; nutrient limitation","OtherDescriptors":null,"Notes":null,"AnaPub":2004,"MonPub":null,"DateUpdate":"2018-05-17","DateCreate":"2004-02-13","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000189213900003","VABBcode":null,"OpenAcc":1,"DOI":"10.1016/j.seares.2003.05.005"},"refs":null,"anarec":{"AnaID":57435,"PubliDate":2004,"Pagination":"21-35","XtraPublOfAnaID":null,"ISBN":null,"Volume":"51","Issue":"1","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43261,"SerRR":"Journal of Sea Research. 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