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Biological Invasions

, Volume 17, Issue 4, pp 1123–1136 | Cite as

Roles of dispersal mode, recipient environment and disturbance in the secondary spread of the invasive seaweed Codium fragile

  • Karine Gagnon
  • Christopher W. McKindsey
  • Ladd E. Johnson
Original Paper

Abstract

Secondary spread largely determines the distribution and success of invasive species and depends ultimately on the capacity of the invader to disperse and colonise over multiple scales. Spread of the invasive seaweed Codium fragile ssp. fragile (Codium) can occur through the dispersal of vegetative fragments, which can be buoyant or non-buoyant depending on environmental conditions. This study examined the factors influencing the dispersal, settlement, and establishment of these two types of propagules in eelgrass (Zostera marina) meadows of îles de la Madeleine, Canada, where Codium lives epiphytically on eelgrass rhizomes. To measure dispersal, ~1,400 Codium fragments were marked, released, and tracked under different hydrodynamic conditions in areas of high and low eelgrass density. Under all conditions, buoyant fragments dispersed one to two orders of magnitude further than non-buoyant fragments. Dispersal distance was positively correlated with wind speed (a proxy for surface currents in this system) for buoyant fragments and with current speed for non-buoyant fragments. For the latter, dispersal distance was also negatively correlated with eelgrass height and density. Natural deposition of drifting fragments in experimentally-manipulated eelgrass meadows was variable in space and time, but was not affected by eelgrass shoot density. Experimental disturbance of eelgrass meadows enhanced the density, biomass, and percent cover of Codium, suggesting that the exposure of eelgrass rhizomes by natural or anthropogenic disturbance promotes invasion by Codium. Our results highlight the importance of small-scale field experiments in determining the local factors affecting the spread of invasive species.

Keywords

Biological invasions  Codium fragile Dispersal Disturbance Secondary spread Zostera marina 

Notes

Acknowledgments

This study was funded by the Canadian Aquatic Invasive Species Network (CAISN) of the Natural Sciences and Engineering Research Council (NSERC) of Canada, Québec-Océan, the Fondation Communautaire Gaspésie-les-Îles, and an NSERC Discovery Grant (LEJ). We greatly appreciate the logistical support of the Ministère de l’Agriculture, des Pêcheries et de l’Alimentation du Québec (MAPAQ) in Îles-de-la-Madeleine, especially M. Nadeau, B. Myrand, and F. Gallien. Finally we thank C. Chevrier-Turbide and O.Rhoades for assistance in the field, and V. Jormalainen for advice on statistical methods. We are also grateful for the comments of J. Ruesink and two anonymous reviewers which greatly improved the quality of this manuscript.

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Karine Gagnon
    • 1
    • 3
  • Christopher W. McKindsey
    • 2
  • Ladd E. Johnson
    • 1
  1. 1.Département de biologieUniversité LavalQuébecCanada
  2. 2.Maurice Lamontagne InstituteFisheries and Oceans CanadaMont-JoliCanada
  3. 3.Section of Ecology, Department of BiologyUniversity of TurkuTurkuFinland

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