Bottom-up and top-down regulation of decomposition in a tropical forest.
Identifieur interne : 000265 ( Main/Corpus ); précédent : 000264; suivant : 000266Bottom-up and top-down regulation of decomposition in a tropical forest.
Auteurs : Ysabel Milton ; Michael KaspariSource :
- Oecologia [ 0029-8549 ] ; 2007.
English descriptors
- KwdEn :
- MESH :
- geographic : Panama.
- physiology : Arthropods, Feeding Behavior, Trees.
- Animals, Ecosystem, Tropical Climate.
Abstract
The soil nutrients, microbes, and arthropods of tropical forests are patchy at multiple scales. We asked how these three factors interact to generate patterns of decomposition in 450 100 cm(2 )litterbags arrayed along a 50 m ridge top in a Panama rainforest. We tested top-down (via grazing by microbivores like collembola and diplopods) and bottom-up (via added N and P) effects on the decomposition of cellulose. By using a 1,000-fold gradient in mesh size we generated a two-fold gradient in arthropod grazing. Microbivore grazing first retarded then ultimately enhanced decomposition rates. Micropulses of N and P (simulating concentrated urine) enhanced neither decomposition rates nor microbivores but increased the abundance of predacious ants. Decomposition rates also varied across the ridge, and were lowest in a plot with the deepest litter and highest soil moisture. These data generate the working hypothesis that N and P cascade upward at grains of 100 cm(2) to enhance a major predator in the litter; predators then absorb any increases in microbivores attracted to the extra fungal growth. These population interactions are in turn embedded in mesoscale variability generated by individual tree canopies that drive changes in litter quality and soil moisture.
DOI: 10.1007/s00442-007-0710-6
PubMed: 17375326
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pubmed:17375326Le document en format XML
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We asked how these three factors interact to generate patterns of decomposition in 450 100 cm(2 )litterbags arrayed along a 50 m ridge top in a Panama rainforest. We tested top-down (via grazing by microbivores like collembola and diplopods) and bottom-up (via added N and P) effects on the decomposition of cellulose. By using a 1,000-fold gradient in mesh size we generated a two-fold gradient in arthropod grazing. Microbivore grazing first retarded then ultimately enhanced decomposition rates. Micropulses of N and P (simulating concentrated urine) enhanced neither decomposition rates nor microbivores but increased the abundance of predacious ants. Decomposition rates also varied across the ridge, and were lowest in a plot with the deepest litter and highest soil moisture. These data generate the working hypothesis that N and P cascade upward at grains of 100 cm(2) to enhance a major predator in the litter; predators then absorb any increases in microbivores attracted to the extra fungal growth. These population interactions are in turn embedded in mesoscale variability generated by individual tree canopies that drive changes in litter quality and soil moisture.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">17375326</PMID><DateCompleted><Year>2007</Year><Month>09</Month><Day>05</Day></DateCompleted><DateRevised><Year>2018</Year><Month>11</Month><Day>13</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Print">0029-8549</ISSN><JournalIssue CitedMedium="Print"><Volume>153</Volume><Issue>1</Issue><PubDate><Year>2007</Year><Month>Aug</Month></PubDate></JournalIssue><Title>Oecologia</Title><ISOAbbreviation>Oecologia</ISOAbbreviation></Journal><ArticleTitle>Bottom-up and top-down regulation of decomposition in a tropical forest.</ArticleTitle><Pagination><MedlinePgn>163-72</MedlinePgn></Pagination><Abstract><AbstractText>The soil nutrients, microbes, and arthropods of tropical forests are patchy at multiple scales. We asked how these three factors interact to generate patterns of decomposition in 450 100 cm(2 )litterbags arrayed along a 50 m ridge top in a Panama rainforest. We tested top-down (via grazing by microbivores like collembola and diplopods) and bottom-up (via added N and P) effects on the decomposition of cellulose. By using a 1,000-fold gradient in mesh size we generated a two-fold gradient in arthropod grazing. Microbivore grazing first retarded then ultimately enhanced decomposition rates. Micropulses of N and P (simulating concentrated urine) enhanced neither decomposition rates nor microbivores but increased the abundance of predacious ants. Decomposition rates also varied across the ridge, and were lowest in a plot with the deepest litter and highest soil moisture. These data generate the working hypothesis that N and P cascade upward at grains of 100 cm(2) to enhance a major predator in the litter; predators then absorb any increases in microbivores attracted to the extra fungal growth. These population interactions are in turn embedded in mesoscale variability generated by individual tree canopies that drive changes in litter quality and soil moisture.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Milton</LastName><ForeName>Ysabel</ForeName><Initials>Y</Initials><AffiliationInfo><Affiliation>Department of Zoology, Graduate Program in Ecology and Evolutionary Biology, University of Oklahoma, 730 Van Vleet Oval, Rm 314, Norman, OK 73019-0235, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Kaspari</LastName><ForeName>Michael</ForeName><Initials>M</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType><PublicationType UI="D013485">Research Support, Non-U.S. Gov't</PublicationType><PublicationType UI="D013486">Research Support, U.S. Gov't, Non-P.H.S.</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2007</Year><Month>03</Month><Day>21</Day></ArticleDate></Article><MedlineJournalInfo><Country>Germany</Country><MedlineTA>Oecologia</MedlineTA><NlmUniqueID>0150372</NlmUniqueID><ISSNLinking>0029-8549</ISSNLinking></MedlineJournalInfo><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName UI="D000818" MajorTopicYN="N">Animals</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D001181" MajorTopicYN="N">Arthropods</DescriptorName><QualifierName UI="Q000502" MajorTopicYN="Y">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D017753" MajorTopicYN="Y">Ecosystem</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D005247" MajorTopicYN="N">Feeding Behavior</DescriptorName><QualifierName UI="Q000502" MajorTopicYN="Y">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D010176" MajorTopicYN="N" Type="Geographic">Panama</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D014197" MajorTopicYN="N">Trees</DescriptorName><QualifierName UI="Q000502" MajorTopicYN="Y">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D014329" MajorTopicYN="Y">Tropical Climate</DescriptorName></MeshHeading></MeshHeadingList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2005</Year><Month>11</Month><Day>30</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>2007</Year><Month>02</Month><Day>26</Day></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2007</Year><Month>3</Month><Day>22</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2007</Year><Month>9</Month><Day>6</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2007</Year><Month>3</Month><Day>22</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">17375326</ArticleId><ArticleId IdType="doi">10.1007/s00442-007-0710-6</ArticleId></ArticleIdList><ReferenceList><Reference><Citation>Oecologia. 2004 May;139(4):641-6</Citation><ArticleIdList><ArticleId IdType="pubmed">15069634</ArticleId></ArticleIdList></Reference><Reference><Citation>Oecologia. 1993 Mar;93(2):303-306</Citation><ArticleIdList><ArticleId IdType="pubmed">28313621</ArticleId></ArticleIdList></Reference><Reference><Citation>Am Nat. 2000 Feb;155(2):141-153</Citation><ArticleIdList><ArticleId IdType="pubmed">10686157</ArticleId></ArticleIdList></Reference><Reference><Citation>Science. 2000 Dec 1;290(5497):1758-61</Citation><ArticleIdList><ArticleId IdType="pubmed">11099413</ArticleId></ArticleIdList></Reference><Reference><Citation>Oecologia. 1993 Jul;94(4):457-471</Citation><ArticleIdList><ArticleId IdType="pubmed">28313985</ArticleId></ArticleIdList></Reference><Reference><Citation>Science. 1966 Jul 1;153(3731):67-9</Citation><ArticleIdList><ArticleId IdType="pubmed">17730610</ArticleId></ArticleIdList></Reference><Reference><Citation>Annu Rev Microbiol. 1987;41:465-505</Citation><ArticleIdList><ArticleId IdType="pubmed">3318677</ArticleId></ArticleIdList></Reference><Reference><Citation>Science. 2004 Jul 23;305(5683):509-13</Citation><ArticleIdList><ArticleId IdType="pubmed">15205475</ArticleId></ArticleIdList></Reference><Reference><Citation>Proc Biol Sci. 2000 Mar 7;267(1442):485-9</Citation><ArticleIdList><ArticleId IdType="pubmed">10737406</ArticleId></ArticleIdList></Reference><Reference><Citation>Oecologia. 1996 Jul;107(2):265-273</Citation><ArticleIdList><ArticleId IdType="pubmed">28307313</ArticleId></ArticleIdList></Reference></ReferenceList></PubmedData></pubmed></record>Pour manipuler ce document sous Unix (Dilib)
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