Unlikely Nomads: Settlement, Establishment, and Dislodgement Processes of Vegetative Seagrass Fragments

Frontiers in Plant Science
Samantha LaiPeter A Todd

Abstract

The dispersal of seagrasses is important to promoting the resilience and long-term survival of populations. Most of the research on long-distance dispersal to date has focused on sexual propagules while the dispersal of vegetative fragments has been largely overlooked, despite the important role this mechanism might play. In this study, we proposed a conceptual model that categorizes vegetative fragment dispersal into seven fundamental steps: i.e., (i) fragment formation, (ii) transport, (iii) decay, (iv) substrate contact, (v) settlement, (vi) establishment, and (vii) dislodgement. We present two experiments focusing on the final steps of the model from substrate contact to dislodgement in four tropical seagrass species (Cymodocea rotundata, Halophila ovalis, Halodule uninervis, andThalassia hemprichii), which are critical for dispersed vegetative fragments to colonize new areas. We first conducted a mesocosm experiment to investigate the effect of fragment age and species on settlement (i.e., remains on the substrate in a rising tide) and subsequently establishment (i.e., rooting in substrate) rates. To determine dislodgement resistance of settled fragments, we also subjected fragments under different burial treatments to wav...Continue Reading

References

Feb 16, 2005·Proceedings of the National Academy of Sciences of the United States of America·Thorsten B H ReuschBoris Worm
Nov 3, 2006·Marine Pollution Bulletin·Paul L A Erftemeijer, Roy R Robin Lewis
Feb 11, 2014·Marine Pollution Bulletin·Siti Maryam YaakubPeter A Todd
Oct 10, 2014·Proceedings. Biological Sciences·Kathryn McMahonCarlos Duarte

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Citations

Nov 16, 2020·The Science of the Total Environment·R D EvansA Vikrant
Jul 18, 2021·Proceedings of the National Academy of Sciences of the United States of America·Jay T OsvaticBenedict Yuen

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