Carbon and nutrient limitation of soil microorganisms and microbial grazers in a tropical montane rain forest
2010; Wiley; Volume: 119; Issue: 6 Linguagem: Inglês
10.1111/j.1600-0706.2009.18169.x
ISSN1600-0706
AutoresValentyna Krashevska, Mark Maraun, Liliane Rueß, Stefan Scheu,
Tópico(s)Biocrusts and Microbial Ecology
ResumoOikosVolume 119, Issue 6 p. 1020-1028 Carbon and nutrient limitation of soil microorganisms and microbial grazers in a tropical montane rain forest Valentyna Krashevska, Valentyna Krashevska J. F. Blumenbach Inst. of Zoology and Anthropology, Animal Ecology, Georg-August-Univ. of Goettingen, Berliner Str. 28, DE–37073 Goettingen, GermanySearch for more papers by this authorMark Maraun, Mark Maraun J. F. Blumenbach Inst. of Zoology and Anthropology, Animal Ecology, Georg-August-Univ. of Goettingen, Berliner Str. 28, DE–37073 Goettingen, GermanySearch for more papers by this authorLiliane Ruess, Liliane Ruess J. F. Blumenbach Inst. of Zoology and Anthropology, Animal Ecology, Georg-August-Univ. of Goettingen, Berliner Str. 28, DE–37073 Goettingen, GermanySearch for more papers by this authorStefan Scheu, Stefan Scheu J. F. Blumenbach Inst. of Zoology and Anthropology, Animal Ecology, Georg-August-Univ. of Goettingen, Berliner Str. 28, DE–37073 Goettingen, GermanySearch for more papers by this author Valentyna Krashevska, Valentyna Krashevska J. F. Blumenbach Inst. of Zoology and Anthropology, Animal Ecology, Georg-August-Univ. of Goettingen, Berliner Str. 28, DE–37073 Goettingen, GermanySearch for more papers by this authorMark Maraun, Mark Maraun J. F. Blumenbach Inst. of Zoology and Anthropology, Animal Ecology, Georg-August-Univ. of Goettingen, Berliner Str. 28, DE–37073 Goettingen, GermanySearch for more papers by this authorLiliane Ruess, Liliane Ruess J. F. Blumenbach Inst. of Zoology and Anthropology, Animal Ecology, Georg-August-Univ. of Goettingen, Berliner Str. 28, DE–37073 Goettingen, GermanySearch for more papers by this authorStefan Scheu, Stefan Scheu J. F. Blumenbach Inst. of Zoology and Anthropology, Animal Ecology, Georg-August-Univ. of Goettingen, Berliner Str. 28, DE–37073 Goettingen, GermanySearch for more papers by this author First published: 24 May 2010 https://doi.org/10.1111/j.1600-0706.2009.18169.xCitations: 49 V. Krashevska, J. F. Blumenbach Inst. of Zoology and Anthropology, Animal Ecology, Georg-August-Univ. of Goettingen, Berliner Str. 28, DE–37073 Goettingen, Germany. E-mail: [email protected] Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract We investigated the role of carbon, nitrogen and phosphorus as limiting factors of microorganisms and microbial grazers (testate amoebae) in a montane tropical rain forest in southern Ecuador. Carbon (as glucose), nitrogen (as NH4NO3) and phosphorus (as NaH2PO4) were added separately and in combination bimonthly to experimental plots for 20 months. By adding glucose and nutrients we expected to increase the growth of microorganisms as the major food resource of testate amoebae. The response of microorganisms to experimental treatments was determined by analysing microbial biomass (SIR), fungal biomass and microbial community composition as measured by phospholipid fatty acids (PLFAs). We hypothesized that the response of testate amoebae is closely linked to that of microorganisms. Carbon addition strongly increased ergosterol concentration and, less pronounced, the amount of linoleic acid as fungal biomarker, suggesting that saprotrophic fungi are limited by carbon. Microbial biomass and ergosterol concentrations reached a maximum in the combined treatment with C, N and P indicating that both N and P also were in short supply. In contrast to saprotrophic fungi and microorganisms in total, testate amoebae suffered from the addition of C and reached maximum density by the addition of N. The results indicate that saprotrophic fungi in tropical montane rain forests are mainly limited by carbon whereas gram positive and negative bacteria benefit from increased availability of P. Testate amoebae suffered from increased dominance of saprotrophic fungi in glucose treatments but benefited from increased supply of N. 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