Litter microbial responses to climate change: How do inland or coastal context and litter type matter across the Mediterranean?

Warmer and drier climates are expected in the Mediterranean basin which is considered as a climate-change hotspot. Here we used climate contrasts across the Mediterranean to mimic climate change effects on litter microbial communities. Litterbags of monospecific (Pinus halepensis and Pistacia lentis...

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Autores principales:	Maya Kheir, Thomas Z. Lerch, Amine Habib Borsali, Philip Roche, Fabio Ziarelli, Mohamed Zouidi, Anne Marie Farnet Da Silva
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Aridity Climate contrasts Microbial decomposers In natura approach Litterbag transfer Mediterranean basin Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/dc84b7500d6e4de2b631a42eece28a42
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spelling	oai:doaj.org-article:dc84b7500d6e4de2b631a42eece28a422021-12-01T04:47:31ZLitter microbial responses to climate change: How do inland or coastal context and litter type matter across the Mediterranean?1470-160X10.1016/j.ecolind.2021.107505https://doaj.org/article/dc84b7500d6e4de2b631a42eece28a422021-06-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21001709https://doaj.org/toc/1470-160XWarmer and drier climates are expected in the Mediterranean basin which is considered as a climate-change hotspot. Here we used climate contrasts across the Mediterranean to mimic climate change effects on litter microbial communities. Litterbags of monospecific (Pinus halepensis and Pistacia lentiscus) and of binary mixtures of litter (Pinus/Pistacia, 50/50) were transferred across contrasted climates between France and Algeria (from a sub-humid to a semi-arid climate). We tested the effect of litter type (species identity, litter-mixing) and of environmental context (coast/inland) on microbial responses to more constraining climate conditions. After 12-months of field incubation, litter chemical properties (C/N and solid-state 13C NMR) and microbial markers (active microbial biomass (MB), basal respiration (BR), bacterial catabolic and genetic structures (BIOLOG and T-RFLP) were characterized. After transfer, catabolic and genetic structures were different from those of both French and Algerian control and responses depended on the context and on litter type: stronger modifications were observed in inland context, except for microbial communities of Pistacia lentiscus litter (weak variations). However, MB and BR decreased in response to transfer for this litter type. On the other hand, and for either inland or coastal context, MB of Pinus halepensis litter did not vary in response to transfer and BR decreased reflecting microbial performance in sustaining biomass and limiting C losses through respiration. Here, litter mixture did not mitigate the effect of climate stress on microbial communities neither in inland nor in coastal context: lower MB and BR were detected after transfer in inland context whereas lower MB was accompanied by a higher BR in coastal context, reflecting an increase in CO2 release for a weaker amount of microbial biomass. This study shows that microbial responses to climate change vary with litter type and also with the environmental context.Maya KheirThomas Z. LerchAmine Habib BorsaliPhilip RocheFabio ZiarelliMohamed ZouidiAnne Marie Farnet Da SilvaElsevierarticleAridityClimate contrastsMicrobial decomposersIn natura approachLitterbag transferMediterranean basinEcologyQH540-549.5ENEcological Indicators, Vol 125, Iss , Pp 107505- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Aridity Climate contrasts Microbial decomposers In natura approach Litterbag transfer Mediterranean basin Ecology QH540-549.5
spellingShingle	Aridity Climate contrasts Microbial decomposers In natura approach Litterbag transfer Mediterranean basin Ecology QH540-549.5 Maya Kheir Thomas Z. Lerch Amine Habib Borsali Philip Roche Fabio Ziarelli Mohamed Zouidi Anne Marie Farnet Da Silva Litter microbial responses to climate change: How do inland or coastal context and litter type matter across the Mediterranean?
description	Warmer and drier climates are expected in the Mediterranean basin which is considered as a climate-change hotspot. Here we used climate contrasts across the Mediterranean to mimic climate change effects on litter microbial communities. Litterbags of monospecific (Pinus halepensis and Pistacia lentiscus) and of binary mixtures of litter (Pinus/Pistacia, 50/50) were transferred across contrasted climates between France and Algeria (from a sub-humid to a semi-arid climate). We tested the effect of litter type (species identity, litter-mixing) and of environmental context (coast/inland) on microbial responses to more constraining climate conditions. After 12-months of field incubation, litter chemical properties (C/N and solid-state 13C NMR) and microbial markers (active microbial biomass (MB), basal respiration (BR), bacterial catabolic and genetic structures (BIOLOG and T-RFLP) were characterized. After transfer, catabolic and genetic structures were different from those of both French and Algerian control and responses depended on the context and on litter type: stronger modifications were observed in inland context, except for microbial communities of Pistacia lentiscus litter (weak variations). However, MB and BR decreased in response to transfer for this litter type. On the other hand, and for either inland or coastal context, MB of Pinus halepensis litter did not vary in response to transfer and BR decreased reflecting microbial performance in sustaining biomass and limiting C losses through respiration. Here, litter mixture did not mitigate the effect of climate stress on microbial communities neither in inland nor in coastal context: lower MB and BR were detected after transfer in inland context whereas lower MB was accompanied by a higher BR in coastal context, reflecting an increase in CO2 release for a weaker amount of microbial biomass. This study shows that microbial responses to climate change vary with litter type and also with the environmental context.
format	article
author	Maya Kheir Thomas Z. Lerch Amine Habib Borsali Philip Roche Fabio Ziarelli Mohamed Zouidi Anne Marie Farnet Da Silva
author_facet	Maya Kheir Thomas Z. Lerch Amine Habib Borsali Philip Roche Fabio Ziarelli Mohamed Zouidi Anne Marie Farnet Da Silva
author_sort	Maya Kheir
title	Litter microbial responses to climate change: How do inland or coastal context and litter type matter across the Mediterranean?
title_short	Litter microbial responses to climate change: How do inland or coastal context and litter type matter across the Mediterranean?
title_full	Litter microbial responses to climate change: How do inland or coastal context and litter type matter across the Mediterranean?
title_fullStr	Litter microbial responses to climate change: How do inland or coastal context and litter type matter across the Mediterranean?
title_full_unstemmed	Litter microbial responses to climate change: How do inland or coastal context and litter type matter across the Mediterranean?
title_sort	litter microbial responses to climate change: how do inland or coastal context and litter type matter across the mediterranean?
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/dc84b7500d6e4de2b631a42eece28a42
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Litter microbial responses to climate change: How do inland or coastal context and litter type matter across the Mediterranean?

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