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Plant function and evolutionary biology
RESEARCH ARTICLE

Nitrogen sharing and water source partitioning co-occur in estuarine wetlands

Lili Wei A B C D , David A. Lockington B D E , Shen Yu A and Catherine E. Lovelock B C
+ Author Affiliations
- Author Affiliations

A Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.

B National Centre for Groundwater Research and Training, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia.

C School of Biological Sciences, The University of Queensland, Brisbane, St Lucia, Qld 4072, Australia.

D School of Civil Engineering, The University of Queensland, Brisbane, St Lucia, Qld 4072, Australia.

E Corresponding author. Email: d.lockington@uq.edu.au

Functional Plant Biology 42(4) 410-417 https://doi.org/10.1071/FP14141
Submitted: 17 May 2014  Accepted: 23 December 2014   Published: 12 February 2015

Abstract

Plant–plant interactions are particularly complex in multi-resource limited environments. The aim of this study was to assess species interactions in estuarine wetlands where both N and fresh water are limited. We combined stable isotope methods and dissimilarity analyses to compare interspecific interactions in N source use and water source use. Both Melaleuca quinquenervia (Cav.) S. T Blake and Avicennia marina (Forssk.) Vierh. had a lower leaf δ15N when they were growing together with the N-fixer Casuarina glauca Sieb. ex Spreng. compared with those trees growing in monospecific stands, but their water isotopes, δ18O and δD, were different from C. glauca. Our results indicate that the N-fixer C. glauca shared their N with co-existing neighbours, either indirectly or directly, but that water sources were partitioned among them. Further analyses showed that M. quinquenervia and C. glauca had lower dissimilarity in N source use but higher dissimilarity in water source use than the C. glaucaA. marina pair, implying that the co-existence between M. quinquenervia and C. glauca is relatively stable. Our results suggest that facilitative interaction and resource partitioning can co-occur in estuarine wetlands, and which could be important in maintaining diversity across resource gradients.

Additional keywords: actinorhizal plant, mangroves, paper-bark tea tree, resource partitioning, resource sharing, swamp oak.


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