Spatial variation in the structure of mangrove forests with respect to seawalls

C. Heatherington, M. J. Bishop

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Artificial structures, such as seawalls, are increasingly disrupting the transition zones between terrestrial and marine systems. They can impede the transport of resources across habitat boundaries and impact adjacent sedimentary ecosystems by modifying hydrodynamics which, in turn, influence sedimentology and erosion. We assessed how structural elements of Avicennia marina mangrove forests along the Parramatta River estuary, Sydney, Australia, differ in the presence or absence of a seawall on the landward side of the forest. These forests are of importance to resident and transient fauna. Sampling of paired mangrove forests, with and without seawalls, supported our hypotheses of structural differences between them. Mangrove forests with seawalls were in some instances less than a third of the width of unconstrained mangrove forests, and had up to twice the pneumatophore density. They often contained less leaf litter and had fewer saplings than forests without seawalls. These results suggest that as shoreline armouring continues, urban mangrove forests and their important ecosystem functions may be negatively impacted. Studies are now needed to ascertain the mechanisms by which seawalls modify these systems.

LanguageEnglish
Pages926-933
Number of pages8
JournalMarine and Freshwater Research
Volume63
Issue number10
DOIs
Publication statusPublished - 2012

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mangrove forests
mangrove
spatial variation
Avicennia marina
ecosystems
saplings
plant litter
hydrodynamics
estuaries
fauna
sapling
ecosystem function
marina
sedimentology
leaf litter
rivers
transition zone
shoreline
habitats
estuary

Cite this

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Spatial variation in the structure of mangrove forests with respect to seawalls. / Heatherington, C.; Bishop, M. J.

In: Marine and Freshwater Research, Vol. 63, No. 10, 2012, p. 926-933.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Bishop, M. J.

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