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Authors Espinar, JL; Thompson, K; Garcia, LV
Author Full Name Espinar, JL; Thompson, K; Garcia, LV
Title Timing of seed dispersal generates a bimodal seed bank depth distribution
Source AMERICAN JOURNAL OF BOTANY
Language English
Document Type Article
Author Keywords Donana; helophytes; Juncus; Mediterranean wetland; Scirpus; seed buoyancy; seed rain; soil cracks
Keywords Plus GERMINATION; SOIL
Abstract The density of soil seed banks is normally highest at the soil surface and declines monotonically with depth. Sometimes. for a variety of reasons, peak density occurs below the surface but, except in severely disturbed soils, it is generally true that deeper seeds are older. In seasonally dry habitats that develop deep soil cracks during the dry season, it is possible that some seeds fall down cracks and rapidly become deeply buried. We investigated this possibility for three dominant clonal perennials (Scirpus maritimus, S. litoralis, and Juncus subulatus) in the Donana salt marsh, it nontidal marsh with a Mediterranean climate located in southwest Spain. Two species, which shed most of their seed during the dry season and have seeds with low buoyancy, had bimodal viable seed depth distributions, with peak densities at the surface and at 16-20 cm. A third species, which shed most seeds after soil cracks had closed and had seeds with high buoyancy, had viable seeds only in surface soil. Bimodal seed bank depth distributions may be relatively common in seasonally dry habitats with fine-textured soils, but their ecological significance has not been investigated.
Author Address CSIC, Dept Geoecol, Inst Recursos Nat & Agrobiol Sevilla, E-41080 Seville, Spain; Univ Sheffield, Dept Anim & Plant Sci, Sheffield S10 2TN, S Yorkshire, England
Reprint Address Espinar, JL (corresponding author), US Geol Survey, Natl Wetlands Res Ctr, 700 Cajundome Blvd, Lafayette, LA 70506 USA.
E-mail Address jespinar@usgs.gov
ResearcherID Number Garcia, Luis V./A-4252-2008; Espinar, Jose L./AAB-5623-2020
ORCID Number Garcia, Luis V./0000-0002-5514-2941; Espinar, Jose L./0000-0001-6650-1690
Times Cited 25
Total Times Cited Count (WoS, BCI, and CSCD) 34
Publisher WILEY
Publisher City HOBOKEN
Publisher Address 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
ISSN 0002-9122
29-Character Source Abbreviation AM J BOT
ISO Source Abbreviation Am. J. Bot.
Publication Date OCT
Year Published 2005
Volume 92
Issue 10
Beginning Page 1759
Ending Page 1763
Digital Object Identifier (DOI) 10.3732/ajb.92.10.1759
Page Count 5
Web of Science Category Plant Sciences
Subject Category Plant Sciences
Document Delivery Number 971BT
Unique Article Identifier WOS:000232356800017
Plants associated with this reference

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