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Publication Type J
Authors Statton, J; Sellers, R; Dixon, KW; Kilminster, K; Merritt, DJ; Kendrick, GA
Author Full Name Statton, John; Sellers, Robert; Dixon, Kingsley W.; Kilminster, Kieryn; Merritt, David J.; Kendrick, Gary A.
Title Seed dormancy and germination of Halophila ovalis mediated by simulated seasonal temperature changes
Source ESTUARINE COASTAL AND SHELF SCIENCE
Language English
Document Type Article
Keywords Plus DECIPIENS OSTENFELD HYDROCHARITACEAE; ENVIRONMENTAL-FACTORS; SEAGRASS; AUSTRALIA; RESTORATION; RECOVERY; PANAMA; BAY; QUEENSLAND; ETHYLENE
Abstract The seagrass, Halophila ovalis plays an important ecological and sediment stability role in estuarine systems in Australia with the species in decline in many sites. Halophila ovalis is a facultative annual, relying mainly on recruitment from the sediment seed bank for the annual regeneration of meadows. Despite this, there is little understanding of seed dormancy releasing mechanisms and germination cues. Using H. ovalis seed from the warm temperate Swan River Estuary in Western Australia, the germination ecology of H. ovalis was investigated by simulating the natural seasonal variation in water temperatures. The proportion of germinating seeds was found to be significantly different among temperature treatments (p < 0.001). The treatment with the longest period of cold exposure at 15 degrees C followed by an increase in temperature to 20-25 degrees C (i.e. cold stratification) had the highest final mean germination of 32% and the fastest, germination rate. Seeds exposed to constant mean winter temperatures of 15 degrees C had the slowest germination rate with less than two seeds germinating over 118 days. Thus temperature is a key germination cue for H. ovalis seeds and these data infer that cold stratification is an important dormancy releasing mechanism. This finding has implications for recruitment in facultative annual species like H. ovalis under global warming since the trend for increasing water temperatures in the region may limit seed -based recruitment in the future. (C) 2017 Elsevier Ltd. All rights reserved.
Author Address [Statton, John; Sellers, Robert; Dixon, Kingsley W.; Kilminster, Kieryn; Merritt, David J.; Kendrick, Gary A.] Univ Western Australia, Fac Sci, Sch Biol Sci, Crawley, WA 6009, Australia; [Statton, John; Sellers, Robert; Dixon, Kingsley W.; Kilminster, Kieryn; Merritt, David J.; Kendrick, Gary A.] Univ Western Australia, Fac Sci, UWA Oceans Inst, Crawley, WA 6009, Australia; [Dixon, Kingsley W.] Curtin Univ, Dept Environm & Agr, Perth, WA, Australia; [Kilminster, Kieryn] Govt Western Australia, Dept Water & Environm Regulat, Locked Bay 33,Cloisters Sq, Perth, WA 6850, Australia; [Dixon, Kingsley W.; Merritt, David J.] Kings Pk & Bot Gardens, Kings Pk, Kings Pk, WA 6005, Australia
Reprint Address Statton, J (reprint author), Univ Western Australia, Fac Sci, Sch Biol Sci, Crawley, WA 6009, Australia.; Statton, J (reprint author), Univ Western Australia, Fac Sci, UWA Oceans Inst, Crawley, WA 6009, Australia.
E-mail Address john.statton@uwa.edu.au
ResearcherID Number dixon, kingsley/A-8133-2016
ORCID Number dixon, kingsley/0000-0001-5989-2929; Merritt, David/0000-0002-3250-6861; Kendrick, Gary/0000-0002-0276-6064
Funding Agency and Grant Number ARC [LP130100155, LP160101011]; BMT Oceanica Environmental Consultants; Shark Bay Resources; Rottnest Island Authority; University of Western Australia; Virginia Institute of Marine Sciences; Botanic Gardens and Parks Authority of Western Australia
Funding Text This project was funded through two ARC Linkage grants (LP130100155, LP160101011) with industry partners BMT Oceanica Environmental Consultants, Shark Bay Resources, Rottnest Island Authority, the University of Western Australia, Virginia Institute of Marine Sciences and the Botanic Gardens and Parks Authority of Western Australia.
Cited Reference Count 45
Publisher ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Publisher City LONDON
Publisher Address 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND
ISSN 0272-7714
29-Character Source Abbreviation ESTUAR COAST SHELF S
ISO Source Abbreviation Estuar. Coast. Shelf Sci.
Publication Date NOV 5
Year Published 2017
Volume 198
Part Number A
Beginning Page 156
Ending Page 162
Digital Object Identifier (DOI) 10.1016/j.ecss.2017.08.045
Page Count 7
Web of Science Category Marine & Freshwater Biology; Oceanography
Subject Category Marine & Freshwater Biology; Oceanography
Document Delivery Number FN1WD
Unique Article Identifier WOS:000415781000014
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