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Authors Sim, LL; Chambers, JM; Davis, JA
Author Full Name Sim, Lien L.; Chambers, Jane M.; Davis, Jenny A.
Title Ecological regime shifts in salinised wetland systems. I. Salinity thresholds for the loss of submerged macrophytes
Source HYDROBIOLOGIA
Language English
Document Type Article
Author Keywords Ruppia polycarpa; Lamprothamnium macropogon; Lamprothamnium cf. succinctum; charophyte; seed bank; wetland restoration; Western Australia
Keywords Plus GENUS RUPPIA L; SOUTH-AUSTRALIA; WESTERN-AUSTRALIA; STABLE STATES; LAKES; COMMUNITIES; BIOLOGY; RANGE; FLORA; SALT
Abstract This paper is the first in a pair investigating potential mechanisms for ecological regime change in salinising wetlands. In this first paper, we investigated some of the factors responsible for the formation and maintenance of a macrophyte-dominated ecological regime by studying the germination and flowering of four submerged macrophyte species common in saline Western Australian wetlands; Ruppia polycarpa R. Mason, Ruppia megacarpa R. Mason, Lamprothamnium macropogon (A. Braun) Ophel and L. cf. succinctum (A. Braun in Ascherson) Wood, and by following the survival of adult R. polycarpa as salinities were increased to a range of endpoints (6, 15, 45, 70 and 100 ppt). Increased salinity led to a decrease in the number of germinating plants, an increase in the time to emergence of germinating plants and a decrease in the number of inflorescences (or fertile plants) produced by R. polycarpa, L. macropogon and L. cf. succinctum. Germination of R. megacarpa was low, providing limited information with regard to salinity response. The survival of adult plants also decreased as salinity increased and was negatively affected by faster rates of salinity increase. The upper salinity limits for germination, within the 70 day experiment, were 40-50 ppt for R. polycarpa and L. cf. succinctum, and 30-40 ppt for L. macropogon. Survival of adult R. polycarpa also declined markedly at above 45 ppt.
Author Address Murdoch Univ, Sch Environm Sci, Aquat Ecosyst Res Grp, Murdoch, WA 6150, Australia
Reprint Address Sim, LL (corresponding author), Murdoch Univ, Sch Environm Sci, Aquat Ecosyst Res Grp, South St, Murdoch, WA 6150, Australia.
E-mail Address L.Sim@murdoch.edu.au
ResearcherID Number Davis, Jenny/C-4045-2009
Times Cited 34
Total Times Cited Count (WoS, BCI, and CSCD) 38
Publisher SPRINGER
Publisher City DORDRECHT
Publisher Address VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
ISSN 0018-8158
29-Character Source Abbreviation HYDROBIOLOGIA
ISO Source Abbreviation Hydrobiologia
Publication Date DEC
Year Published 2006
Volume 573
Beginning Page 89
Ending Page 107
Digital Object Identifier (DOI) 10.1007/s10750-006-0267-0
Page Count 19
Web of Science Category Marine & Freshwater Biology
Subject Category Marine & Freshwater Biology
Document Delivery Number 102FK
Unique Article Identifier WOS:000241796200007
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