The growth and autoecology of two alien invasive species: Sargassum muticum and Undaria pinnatiﬁda spreading in the Venice Lagoon were studied monthly, during one year, in two sites of different depth. S. muticum was present year-round and reached its largest size (485 cm) and maximum growth (8.33 cm/ d) at the deepest station. U. pinnatiﬁda was present only from November to May, reaching the highest size (130 cm) in March - April in the shallow station with growth peaks of 2.32 cm/ d. The growth of both species was mainly regulated by water temperature, nutrient concentration, especially nitrogen, and water turbidity. The study highlights the different ecological role already observed for the two species: U. pinnatiﬁda prefers eutrophic areas and is not present along the sea-coastline. Its total standing crop does no texceed 0.2 ktonnes fwt for all the Venice Lagoon. Conversely, S. muticum colonizes areas with a lower eutrophication level, such as the lagooninlets, reaching a total lagoon standing crop of 4-6 ktonnes fwt.
|Titolo:||Annual growth and environmental relationships of the invasive species Sargassum muticum and Undaria pinnatifida in the lagoon of Venice|
|Data di pubblicazione:||2013|
|Appare nelle tipologie:||2.1 Articolo su rivista |
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