The use of fresh and saline water sources by the mangrove Avicennia marina

Santini, Nadia S., Reef, Ruth, Lockington, David A. and Lovelock, Catherine E. (2015) The use of fresh and saline water sources by the mangrove Avicennia marina. Hydrobiologia, 745 1: 59-68. doi:10.1007/s10750-014-2091-2


Author Santini, Nadia S.
Reef, Ruth
Lockington, David A.
Lovelock, Catherine E.
Title The use of fresh and saline water sources by the mangrove Avicennia marina
Formatted title
The use of fresh and saline water sources by the mangrove Avicennia marina
Journal name Hydrobiologia   Check publisher's open access policy
ISSN 1573-5117
0018-8158
Publication date 2015-02
Year available 2014
Sub-type Article (original research)
DOI 10.1007/s10750-014-2091-2
Open Access Status
Volume 745
Issue 1
Start page 59
End page 68
Total pages 10
Place of publication Dordrecht, Netherlands
Publisher Springer Netherlands
Collection year 2015
Language eng
Formatted abstract
Mangroves are distributed along tropical and subtropical riverine and coastal shores. Although mangroves are highly adapted to saline environments, maintaining water uptake under saline conditions is energetically expensive. Therefore, salinity is a limiting factor for mangrove growth and productivity, and access to fresh water sources, such as rainwater and groundwater, which reduce water salinity, increase mangrove ecosystem productivity. Here, we investigated the extent of fresh water utilization by mangroves to better predict current and future mangrove productivity. We used the abundance of 18O isotope in stem water to assess: (1) the extent of fresh water utilization by Avicennia marina (Forssk.) Vierh across hydrological settings; and (2) whether growth, measured as increments in stem circumference, is sensitive to variation in rainfall availability. The δ18O isotopic composition of stem water indicated mangroves use both fresh and saline water sources for metabolic processes. However, our results suggest that the proportion of fresh water used by mangroves increases with the availability of fresh water. Growth of the main stems of trees was correlated with rainfall (r2 = 0.34 and r2 = 0.37, P = 0.001). Our results indicate that access to fresh water is important for mangrove productivity because it enhances their growth rates.
Keyword Isotopes
Salinity
Exmouth Gulf
Queensland
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online ahead of print 5 Nov 2014

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Biological Sciences Publications
 
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