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Authors Kaldy, JE; Shafer, DJ; Ailstock, MS; Magoun, AD
Author Full Name Kaldy, James E.; Shafer, Deborah J.; Ailstock, M. Stephen; Magoun, A. Dale
Title Effects of temperature, salinity and seed age on induction of Zostera japonica germination in North America, USA
Source AQUATIC BOTANY
Language English
Document Type Article
Author Keywords Zostera japonica; Seed germination; Introduced species
Keywords Plus PARENT-OFFSPRING CONFLICT; GENETIC DIVERSITY; CHESAPEAKE BAY; MARINA L.; EELGRASS; PATTERNS; POPULATIONS; PERSISTENCE; SEAGRASSES; DISPERSAL
Abstract Seagrasses can colonize unstructured mudflats either through clonal growth or seed germination and survival. Zostera japonica is an introduced seagrass in North America that has rapidly colonized mudflats along the Pacific Coast, leading to active management of the species. Growth and physiology have been evaluated; however, there is little information about the factors influencing seed germination. We examined the effects of storage and induction temperature (10, 15, 20 degrees C) and salinity (0, 10, 20, 30), and storage period (1.5 and 26 months) on germination of seeds of the seagrass Z. japonica collected from Yaquina Bay, Oregon, USA. Seed germination at 15 and 20 degrees C was 1.24 times higher than at 10 degrees C. Cumulative seed germination at salinity 0 during the first 28 days was 6.5 times greater than at a salinity of 10; similarly, initial seed germination at a salinity of 10 was 7.3 times greater than that observed for salinity 20 and 30. The proportion of germinated seeds collected in 2011 and stored for 26 months was 1.24 times greater than seeds collected in 2013 that were stored for only 6 weeks. Overall average germination rates were 21.6% and 17.1% for 2011 and 2013, respectively. Our experimental results indicate that salinity had a much stronger control over Z. japonica germination than temperature, and the long storage period suggests that Z. japonica is capable of developing a persistent seed bank. We hypothesize that Z. japonica uses seasonal variations in temperature and salinity to avoid competition between generations favoring germination under conditions that are not optimal for the growth of mature plants. Published by Elsevier B.V.
Author Address [Kaldy, James E.] US EPA, Western Ecol Div, Newport, OR 97365 USA; [Shafer, Deborah J.] Engn Res & Dev Ctr, Vicksburg, MS 39180 USA; [Ailstock, M. Stephen] Anne Arundel Community Coll, Arnold, MD 21012 USA; [Magoun, A. Dale] Appl Res & Anal Inc, Tallulah, LA 71284 USA
Reprint Address Kaldy, JE (corresponding author), US EPA, Western Ecol Div, 2111 SE Marine Sci Dr, Newport, OR 97365 USA.
E-mail Address Kaldy.Jim@epa.gov
Times Cited 21
Total Times Cited Count (WoS, BCI, and CSCD) 23
Publisher ELSEVIER
Publisher City AMSTERDAM
Publisher Address RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS
ISSN 0304-3770
29-Character Source Abbreviation AQUAT BOT
ISO Source Abbreviation Aquat. Bot.
Publication Date OCT
Year Published 2015
Volume 126
Beginning Page 73
Ending Page 79
Digital Object Identifier (DOI) 10.1016/j.aquabot.2015.06.006
Page Count 7
Web of Science Category Plant Sciences; Marine & Freshwater Biology
Subject Category Plant Sciences; Marine & Freshwater Biology
Document Delivery Number CR3VM
Unique Article Identifier WOS:000361261200010
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