Role of physical fragmentation and invertebrate activity in the breakdown rate of leaves
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/98728 https://doi.org/10.1127/0003-9136/2006/0165-0493 |
Resumo: | We evaluated the relative importance of current velocity and invertebrate activities in the breakdown rate of alder [Alnus glutinosa (L.) Gaertner] leaves. Decomposition experiments were carried out in artificial channels, where current velocity and shredder presence were manipulated, and in a 4th order stream, in both summer and autumn, where litter bags were incubated in several reaches differing in both depth and current velocity. Alder leaves incubated in artificial channels decomposed significantly faster in the presence of shredders than in their absence (k = 0.0368/d vs. k = 0.0210/d in low current and k = 0.0472/d vs. k = 0.0219/d in high current). However, current (up to 2.35 m/s) had no significant effect on decomposition rates. In channels without invertebrates, no significant differences in k values were found between coarse and fine mesh bags in high (0.20 m/s) and low (0.05 m/s) current. Leaves incubated in the stream during summer, in reaches with current velocity ranging from 0.003 to 1.185m/s, did not differ in their decomposition rates (k = 0.0489/d to k = 0.0645/d). In autumn, leaves exposed to high current (1.228 m/s) had faster decomposition rate (k = 0.0417/d vs. k = 0.0136/d), which may be related to sediment transport during this time of the year or to the tendency for higher number of shredders in high current-shallow reaches. |
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Role of physical fragmentation and invertebrate activity in the breakdown rate of leavesalder leavesshredderscurrent velocitydecompositionstreamWe evaluated the relative importance of current velocity and invertebrate activities in the breakdown rate of alder [Alnus glutinosa (L.) Gaertner] leaves. Decomposition experiments were carried out in artificial channels, where current velocity and shredder presence were manipulated, and in a 4th order stream, in both summer and autumn, where litter bags were incubated in several reaches differing in both depth and current velocity. Alder leaves incubated in artificial channels decomposed significantly faster in the presence of shredders than in their absence (k = 0.0368/d vs. k = 0.0210/d in low current and k = 0.0472/d vs. k = 0.0219/d in high current). However, current (up to 2.35 m/s) had no significant effect on decomposition rates. In channels without invertebrates, no significant differences in k values were found between coarse and fine mesh bags in high (0.20 m/s) and low (0.05 m/s) current. Leaves incubated in the stream during summer, in reaches with current velocity ranging from 0.003 to 1.185m/s, did not differ in their decomposition rates (k = 0.0489/d to k = 0.0645/d). In autumn, leaves exposed to high current (1.228 m/s) had faster decomposition rate (k = 0.0417/d vs. k = 0.0136/d), which may be related to sediment transport during this time of the year or to the tendency for higher number of shredders in high current-shallow reaches.3F10-AC72-52D0 | Verónica Ferreirainfo:eu-repo/semantics/publishedVersion2006info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/98728http://hdl.handle.net/10316/98728https://doi.org/10.1127/0003-9136/2006/0165-0493eng2-s2.0-33744792461cv-prod-702534Ferreira, VerónicaGraça, Manuel A.S.Lima, João L. M. P. deGomes, Ricardoinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2022-02-08T10:11:20Zoai:estudogeral.uc.pt:10316/98728Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:16:28.291492Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Role of physical fragmentation and invertebrate activity in the breakdown rate of leaves |
title |
Role of physical fragmentation and invertebrate activity in the breakdown rate of leaves |
spellingShingle |
Role of physical fragmentation and invertebrate activity in the breakdown rate of leaves Ferreira, Verónica alder leaves shredders current velocity decomposition stream |
title_short |
Role of physical fragmentation and invertebrate activity in the breakdown rate of leaves |
title_full |
Role of physical fragmentation and invertebrate activity in the breakdown rate of leaves |
title_fullStr |
Role of physical fragmentation and invertebrate activity in the breakdown rate of leaves |
title_full_unstemmed |
Role of physical fragmentation and invertebrate activity in the breakdown rate of leaves |
title_sort |
Role of physical fragmentation and invertebrate activity in the breakdown rate of leaves |
author |
Ferreira, Verónica |
author_facet |
Ferreira, Verónica Graça, Manuel A.S. Lima, João L. M. P. de Gomes, Ricardo |
author_role |
author |
author2 |
Graça, Manuel A.S. Lima, João L. M. P. de Gomes, Ricardo |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Ferreira, Verónica Graça, Manuel A.S. Lima, João L. M. P. de Gomes, Ricardo |
dc.subject.por.fl_str_mv |
alder leaves shredders current velocity decomposition stream |
topic |
alder leaves shredders current velocity decomposition stream |
description |
We evaluated the relative importance of current velocity and invertebrate activities in the breakdown rate of alder [Alnus glutinosa (L.) Gaertner] leaves. Decomposition experiments were carried out in artificial channels, where current velocity and shredder presence were manipulated, and in a 4th order stream, in both summer and autumn, where litter bags were incubated in several reaches differing in both depth and current velocity. Alder leaves incubated in artificial channels decomposed significantly faster in the presence of shredders than in their absence (k = 0.0368/d vs. k = 0.0210/d in low current and k = 0.0472/d vs. k = 0.0219/d in high current). However, current (up to 2.35 m/s) had no significant effect on decomposition rates. In channels without invertebrates, no significant differences in k values were found between coarse and fine mesh bags in high (0.20 m/s) and low (0.05 m/s) current. Leaves incubated in the stream during summer, in reaches with current velocity ranging from 0.003 to 1.185m/s, did not differ in their decomposition rates (k = 0.0489/d to k = 0.0645/d). In autumn, leaves exposed to high current (1.228 m/s) had faster decomposition rate (k = 0.0417/d vs. k = 0.0136/d), which may be related to sediment transport during this time of the year or to the tendency for higher number of shredders in high current-shallow reaches. |
publishDate |
2006 |
dc.date.none.fl_str_mv |
2006 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10316/98728 http://hdl.handle.net/10316/98728 https://doi.org/10.1127/0003-9136/2006/0165-0493 |
url |
http://hdl.handle.net/10316/98728 https://doi.org/10.1127/0003-9136/2006/0165-0493 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
2-s2.0-33744792461 cv-prod-702534 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799134060745850880 |