Universität zu Köln

Milcu, Alexandru ORCID: 0000-0002-2889-1234, Bonkowski, Michael ORCID: 0000-0003-2656-1183, Collins, C. Matilda and Crawley, Michael J. (2015). Aphid honeydew-induced changes in soil biota can cascade up to tree crown architecture. Pedobiologia, 58 (4). S. 119 - 128. MUNICH: ELSEVIER GMBH. ISSN 0031-4056

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Abstract

It has been hypothesised that aphid honeydew could alleviate the feeding damage by aphids via changes in soil biota leading to increased nutrient cycling and plant nutrient availability. However, to date, the evidence is equivocal. We used a field experiment with willow saplings to investigate the effect of aphid honeydew on trees with and without simulated honeydew deposition. Specifically, here we tested whether: (I) honeydew deposition can trigger changes in soil biota community composition, and (2) honeydew-induced changes in soil biota cascade up to affect plant performance and resource allocation. Honeydew deposition significantly increased microbial biomass and respiration, microfauna densities, earthworm biomass and litter mineralisation kinetics, while having detrimental effects on Collembola and mites. Honeydew deposition also increased the tree shoot to root biomass ratio and altered the crown canopy architecture and flowering phenology. However, no effects on leaf nitrogen content and tree shoot or root biomass were found. This was likely due to increased microbial nutrient immobilisation under the honeydew treatment. Path analyses present supporting evidence that the honeydew-induced changes in soil biota (notably via a pathway from microbial biomass to endogenic earthworms), can cascade up to affect tree resource allocation and crown architecture. (C) 2015 Elsevier GmbH. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Milcu, Alexandru UNSPECIFIED orcid.org/0000-0002-2889-1234 UNSPECIFIED Bonkowski, Michael UNSPECIFIED orcid.org/0000-0003-2656-1183 UNSPECIFIED Collins, C. Matilda UNSPECIFIED UNSPECIFIED UNSPECIFIED Crawley, Michael J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-415973
DOI:	10.1016/j.pedobi.2015.07.002
Journal or Publication Title:	Pedobiologia
Volume:	58
Number:	4
Page Range:	S. 119 - 128
Date:	2015
Publisher:	ELSEVIER GMBH
Place of Publication:	MUNICH
ISSN:	0031-4056
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TUBEROLACHNUS-SALIGNUS GMELIN; SCALE INSECT HONEYDEW; MICROBIAL BIOMASS; LITTER DECOMPOSITION; HOST-PLANT; NITROGEN; EARTHWORMS; COLLEMBOLA; CARBON; OWEN Multiple languages Ecology; Soil Science Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/41597