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• W2793312546 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 595:89-103 (2018) - DOI: https://doi.org/10.3354/meps12550 A sediment bioturbator bottleneck to seedling recruitment for the seagrass Posidonia australis A. J. Johnson1,*, J. Statton2, R. J. Orth1, G. A. Kendrick2 1Department of Biological Sciences, Virginia Institute of Marine Science, College of William & Mary, Gloucester Point, VA 23062, USA 2School of Biological Sciences and Oceans Institute, The University of Western Australia, Crawley, WA 6009, Australia *Corresponding author: ajjohnson@vims.edu ABSTRACT: Bioturbating animals have the potential to influence the distribution and survival of seagrass seeds and seedlings within unvegetated substrates. Such disturbances could act as demographic bottlenecks, or restrictions, to seedling recruitment and impede population recovery in degraded systems. This study evaluated the influence of sediment bioturbators on seed settlement and seedling establishment for the seagrass Posidonia australis in temperate and subtropical areas of Western Australia (Cockburn Sound and Shark Bay). Initial benthic surveys recorded the density of sediment bioturbators as well as P. australis seeds and seedlings. The abundant bioturbators observed were the sand dollar Peronella lesueuri and the sea star Archaster angulatus in Cockburn Sound, and the heart urchin Breynia desori in Shark Bay. Surveys demonstrated an overlap in habitat use among bioturbators, seeds, and seedlings, and suggested potential negative seed-fauna interactions in areas where bioturbators were present and abundant. To test this relationship, field manipulative experiments measured the rate at which these bioturbators dislodged and moved both P. australis seeds (unburied and buried) and 1 yr old seedlings. Although all bioturbators dislodged and moved seeds on the sediment surface, only sand dollars and heart urchins dislodged and moved seeds (on average ~4 cm) buried within the sediment. Where high densities of bioturbators, such as sand dollars and heart urchins, exist, considerable impact on P. australis seeds would be expected. No animals dislodged 1 yr old seedlings. Sediment bioturbators act as an important, but often overlooked, bottleneck to seedling recruitment and recovery of degraded seagrass communities. KEY WORDS: Bioturbators · Seeds · Seedling recruitment · Restoration · Seagrass · Posidonia australis Full text in pdf format Supplementary material PreviousNextCite this article as: Johnson AJ, Statton J, Orth RJ, Kendrick GA (2018) A sediment bioturbator bottleneck to seedling recruitment for the seagrass Posidonia australis. Mar Ecol Prog Ser 595:89-103. https://doi.org/10.3354/meps12550 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 595. Online publication date: May 14, 2018 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2018 Inter-Research." @default.
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• W2793312546 date "2018-05-14" @default.
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• W2793312546 title "A sediment bioturbator bottleneck to seedling recruitment for the seagrass Posidonia australis" @default.
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• W2793312546 doi "https://doi.org/10.3354/meps12550" @default.
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