PoplarV1, Main, Exploration, bibRecord, 000D20

Priming of leaf litter decomposition by algae seems of minor importance in natural streams during autumn.

Identifieur interne : 000D20 ( Main/Exploration ); précédent : 000D19; suivant : 000D21

Priming of leaf litter decomposition by algae seems of minor importance in natural streams during autumn.

Auteurs : Arturo Elosegi [Espagne] ; Angie Nicolás [Canada] ; John S. Richardson [Canada]

Source :

PloS one [ 1932-6203 ] ; 2018.

RBID : pubmed:30192753

Descripteurs français

KwdFr :
- Dosage biologique (MeSH), Rhodophyta (MeSH), Rivières (MeSH), Saisons (MeSH).
MESH :
- Dosage biologique, Rhodophyta, Rivières, Saisons.

English descriptors

KwdEn :
- Biological Assay (MeSH), Rhodophyta (MeSH), Rivers (MeSH), Seasons (MeSH).
MESH :
- Biological Assay, Rhodophyta, Rivers, Seasons.

Abstract

Allochthonous detritus of terrestrial origin is one of the main energy sources in forested headwater streams, but its poor nutritional quality makes it difficult to use by heterotrophs. It has been suggested that algae growing on this detritus can enhance its nutritional quality and promote decomposition. So far, most evidence of this "priming effect" is derived from laboratory or mesocosm experiments, and its importance under natural conditions is unclear. We measured accrual of algae, phosphorus uptake capacity, and decomposition of poplar leaves in autumn in open- and closed-canopy reaches in 3 forest and 3 agricultural streams. Chlorophyll a abundance did not change significantly with stream type or with canopy cover, although in some agricultural streams it was higher in open than in closed canopy reaches. Canopy cover did not affect either phosphate uptake capacity or microbial decomposition. On the other hand, although there was no effect of canopy cover on invertebrate fragmentation rate, a significant interaction between canopy cover and stream suggests priming occurs at least in some streams. Overall, the results point to a weak or no priming effect of algae on litter decomposition in natural streams during autumn.

DOI: 10.1371/journal.pone.0200180
PubMed: 30192753
PubMed Central: PMC6128472

Affiliations:

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Le document en format XML

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<author><name sortKey="Richardson, John S" sort="Richardson, John S" uniqKey="Richardson J" first="John S" last="Richardson">John S. Richardson</name>
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<front><div type="abstract" xml:lang="en">Allochthonous detritus of terrestrial origin is one of the main energy sources in forested headwater streams, but its poor nutritional quality makes it difficult to use by heterotrophs. It has been suggested that algae growing on this detritus can enhance its nutritional quality and promote decomposition. So far, most evidence of this "priming effect" is derived from laboratory or mesocosm experiments, and its importance under natural conditions is unclear. We measured accrual of algae, phosphorus uptake capacity, and decomposition of poplar leaves in autumn in open- and closed-canopy reaches in 3 forest and 3 agricultural streams. Chlorophyll a abundance did not change significantly with stream type or with canopy cover, although in some agricultural streams it was higher in open than in closed canopy reaches. Canopy cover did not affect either phosphate uptake capacity or microbial decomposition. On the other hand, although there was no effect of canopy cover on invertebrate fragmentation rate, a significant interaction between canopy cover and stream suggests priming occurs at least in some streams. Overall, the results point to a weak or no priming effect of algae on litter decomposition in natural streams during autumn.</div>
</front>
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Priming of leaf litter decomposition by algae seems of minor importance in natural streams during autumn.

Priming of leaf litter decomposition by algae seems of minor importance in natural streams during autumn.

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

Pour générer des pages wiki