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Effects of competition between two introduced Caulerpa

Piazzi, Luigi and Ceccherelli, Giulia (2002) Effects of competition between two introduced Caulerpa. Marine Ecology Progress Series, Vol. 225 , p. 189-195. eISSN 1616-1599. Article.

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DOI: 10.3354/meps225189


Competitive interactions between 2 introduced algae, Caulerpa taxifolia and C. racemosa, were studied in 2 experiments. The first separately evaluated the interspecific and intraspecific effects on both species by manipulating their abundance. The second investigated the fate of fragments of C. taxifolia transplanted into patches of C. racemosa, in contrast to those established on algal turfs. C. racemosa and C. taxifolia had similar temporal trends in growth but reached different sizes. The overall increase in stolon length at higher densities for both species suggested that positive interactions are very important. However, there was a significant interspecific effect on C. taxifolia stolon length but no effect on C. racemosa. Furthermore, C. taxifolia fragments transplanted into C. racemosa patches showed clear signs of stress with respect to those transplanted into algal turfs: blades became blanched and eroded. Overall, the results of this study suggest that growth increases with density augmentation, therefore suggesting that invasive characteristics of the species may increase with the time of colonisation. Both species tend to spread faster at higher density. Overall, where both species co-occur, we predict that C. racemosa would be the favoured species as regards the outcome of competition.

Item Type:Article
ID Code:640
Uncontrolled Keywords:Caulerpa taxifolia, Caulerpa racemosa, competition, introduced species, positive interaction
Subjects:Area 05 - Scienze biologiche > BIO/07 Ecologia
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze botaniche, ecologiche e geologiche
Publisher Policy:Depositato in conformità con la politica di copyright dell'Editore
Deposited On:18 Aug 2009 10:02

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