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Zostera marina seagrass beds enhance the attachment of the invasive alga Sargassum muticum in soft sediments
Journal article   Open access   Peer reviewed

Zostera marina seagrass beds enhance the attachment of the invasive alga Sargassum muticum in soft sediments

J. Tweedley, E.L. Jackson and M.J. Attrill
Marine Ecology Progress Series, Vol.354, pp.305-309
2008
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Abstract

The first reports of Sargassum muticum occurring in British waters coincided with a warning that this invasive alga may replace seagrass beds, particularly those of Zostera marina. Initial fears were allayed when subsequent research suggested that both species required different attachment substrata, and, therefore, S. muticum would be unable to replace Zostera beds on soft sediments. Here, however, we present evidence supporting the original warning: contrary to previous research we found that S. muticum is able to successfully colonise soft sediments and, furthermore, that the presence of Z. marina may aid attachment. The majority of S. muticum plants within Zostera beds studied at Salcombe, SW England, were found attached within the soft sediment; outside of the seagrass bed, however, this occurred in greatly reduced numbers. Therefore, we suggest that the presence of Z. marina may actually enhance S. muticum colonization of soft sediments, trapping drifting fragments and allowing viable algae to settle on the seagrass matrix in an otherwise unfavorable environment. The consequences for the invasion of seagrass beds by S. muticum may therefore be more severe than previously thought.

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Citation topics
3 Agriculture, Environment & Ecology
3.2 Marine Biology
3.2.509 Marine Algae
Web Of Science research areas
Ecology
Marine & Freshwater Biology
Oceanography
ESI research areas
Environment/Ecology
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