Causal hypotheses accounting for correlations between decomposition rates of different mass fractions of leaf litter.
Identifieur interne : 000170 ( Main/Exploration ); précédent : 000169; suivant : 000171Causal hypotheses accounting for correlations between decomposition rates of different mass fractions of leaf litter.
Auteurs : Bill Shipley [Canada] ; Antoine Tardif [Canada]Source :
- Ecology [ 1939-9170 ] ; 2020.
Abstract
Whole-leaf decomposition rates are the sum of the decomposition rates of each chemical fraction (water-soluble, cellulose, hemicellulose, lignin), but the decomposition rates of each fraction show complicated patterns of covariation. What explains these patterns of covariation? After measuring the k values of each fraction in 42 different mixtures of tree leaf litters from five species, we tested three alternative causal hypotheses that have been proposed in the literature concerning these mixture interactions using structura equations modeling. All three hypotheses were rejected by the data. We then proposed a new hypothesis, in which rapid decomposition of the labile (water-soluble) fraction stimulates the decomposition of lignin by white-rot fungi and the decomposition of hemicellulose by brown-rot fungi. A more rapid decomposition of hemicellulose then stimulates the decomposition of cellulose. This hypothesis is both consistent with known biology and with our data and is proposed as the most viable current hypothesis.
DOI: 10.1002/ecy.3196
PubMed: 32954494
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What explains these patterns of covariation? After measuring the k values of each fraction in 42 different mixtures of tree leaf litters from five species, we tested three alternative causal hypotheses that have been proposed in the literature concerning these mixture interactions using structura equations modeling. All three hypotheses were rejected by the data. We then proposed a new hypothesis, in which rapid decomposition of the labile (water-soluble) fraction stimulates the decomposition of lignin by white-rot fungi and the decomposition of hemicellulose by brown-rot fungi. A more rapid decomposition of hemicellulose then stimulates the decomposition of cellulose. This hypothesis is both consistent with known biology and with our data and is proposed as the most viable current hypothesis.</div></front></TEI><pubmed><MedlineCitation Status="Publisher" Owner="NLM"><PMID Version="1">32954494</PMID><DateRevised><Year>2020</Year><Month>11</Month><Day>03</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1939-9170</ISSN><JournalIssue CitedMedium="Internet"><PubDate><Year>2020</Year><Month>Sep</Month><Day>20</Day></PubDate></JournalIssue><Title>Ecology</Title><ISOAbbreviation>Ecology</ISOAbbreviation></Journal><ArticleTitle>Causal hypotheses accounting for correlations between decomposition rates of different mass fractions of leaf litter.</ArticleTitle><Pagination><MedlinePgn>e03196</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1002/ecy.3196</ELocationID><Abstract><AbstractText>Whole-leaf decomposition rates are the sum of the decomposition rates of each chemical fraction (water-soluble, cellulose, hemicellulose, lignin), but the decomposition rates of each fraction show complicated patterns of covariation. What explains these patterns of covariation? After measuring the k values of each fraction in 42 different mixtures of tree leaf litters from five species, we tested three alternative causal hypotheses that have been proposed in the literature concerning these mixture interactions using structura equations modeling. All three hypotheses were rejected by the data. We then proposed a new hypothesis, in which rapid decomposition of the labile (water-soluble) fraction stimulates the decomposition of lignin by white-rot fungi and the decomposition of hemicellulose by brown-rot fungi. A more rapid decomposition of hemicellulose then stimulates the decomposition of cellulose. This hypothesis is both consistent with known biology and with our data and is proposed as the most viable current hypothesis.</AbstractText><CopyrightInformation>© 2020 by the Ecological Society of America.</CopyrightInformation></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Shipley</LastName><ForeName>Bill</ForeName><Initials>B</Initials><Identifier Source="ORCID">https://orcid.org/0000-0002-7026-3880</Identifier><AffiliationInfo><Affiliation>Département de biologie, Université de Sherbrooke, Sherbrooke, Quebec, J1K 2R1, Canada.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Tardif</LastName><ForeName>Antoine</ForeName><Initials>A</Initials><AffiliationInfo><Affiliation>Département de biologie, Université de Sherbrooke, Sherbrooke, Quebec, J1K 2R1, Canada.</Affiliation></AffiliationInfo></Author></AuthorList><Language>eng</Language><GrantList CompleteYN="Y"><Grant><Agency>Natural Sciences and Engineering Research Council of Canada</Agency><Country></Country></Grant></GrantList><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2020</Year><Month>09</Month><Day>20</Day></ArticleDate></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Ecology</MedlineTA><NlmUniqueID>0043541</NlmUniqueID><ISSNLinking>0012-9658</ISSNLinking></MedlineJournalInfo><CitationSubset>IM</CitationSubset><KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="N">cellulose</Keyword><Keyword MajorTopicYN="N">hemicellulose</Keyword><Keyword MajorTopicYN="N">lignin</Keyword><Keyword MajorTopicYN="N">litter decomposition</Keyword><Keyword MajorTopicYN="N">path analyses</Keyword><Keyword MajorTopicYN="N">proximate tissue analysis</Keyword><Keyword MajorTopicYN="N">water soluble</Keyword></KeywordList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2020</Year><Month>03</Month><Day>17</Day></PubMedPubDate><PubMedPubDate PubStatus="revised"><Year>2020</Year><Month>06</Month><Day>15</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>2020</Year><Month>08</Month><Day>06</Day></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2020</Year><Month>9</Month><Day>22</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2020</Year><Month>9</Month><Day>22</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2020</Year><Month>9</Month><Day>21</Day><Hour>6</Hour><Minute>27</Minute></PubMedPubDate></History><PublicationStatus>aheadofprint</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">32954494</ArticleId><ArticleId IdType="doi">10.1002/ecy.3196</ArticleId></ArticleIdList><ReferenceList><Title>Literature Cited</Title><Reference><Citation>Aber, J. 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Global Ecology and Biogeography 28:1469-1486.</Citation></Reference></ReferenceList></PubmedData></pubmed><affiliations><list><country><li>Canada</li></country></list><tree><country name="Canada"><noRegion><name sortKey="Shipley, Bill" sort="Shipley, Bill" uniqKey="Shipley B" first="Bill" last="Shipley">Bill Shipley</name></noRegion><name sortKey="Tardif, Antoine" sort="Tardif, Antoine" uniqKey="Tardif A" first="Antoine" last="Tardif">Antoine Tardif</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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