1,721,548 research outputs found
Macrophytes and ecological status in the northern basin of the lagoon of Venice.
No full textMacrophytes and ecological status in the northern basin of the lagoon of Venic
Microcalcareous seaweeds to assess trophic changes in transitional waters.
No full textThe analysis of a wide dataset of macrophytes and the most common water parameters shows that the presence/absence and the density of microcalcareous seaweeds can be an useful tool to monitor the trophic status of the environment. These seaweeds are affected by pH changes that in turn are related to nutrient concentrations and macroalgal growth and decomposition that regulate the trophic status of the environment
Macroalgae growth rates and biomass production in eutrophic areas of the Venice Lagoon
No full textFour seaweeds (Ulva rigida, Gracilaria gracilis, Gracilariopsis longissima and Gracilaria vermiculophylla) were monitored from May to October to assess the growth rates and
the biomass production in two eutrophic areas of the Venice lagoon. The growth patterns of the four species displayed a similar behaviour during the year: Ulva grew fastest (up to 17% day -1 ), followed by Gracilariopsis and G. gracilis in the early summer, while G. vermiculophylla, grew slower, mainly in spring
Macroalgal response to the lagoon recovery and aquatic plant transplantation in the Venice Lagoon.
No full textInvasion of alien macroalgae in the venice lagoon, a pest or a resource?
No full textAlien macroalgae, mostly invasive species, are a constant concern for coastal areas, especially in the northern Adriatic Sea where several taxa have colonized the main transitional environments. A revision of the alien macroalgae in the Venice Lagoon shows that, currently, the number of valid non-indigenous species (NIS) is 29, and this number is growing steadily. On the basis of numerous surveys carried out in the last decade the total alien standing crop (SC) was estimated to be ca. 146,534 tonnes fresh weight (fw), i.e. 32% of the total species SC (ca. 456,000 tonnes fw) measured in May–June 2014 in the whole lagoon. The most abundant species were the invasive Agarophyton vermiculophyllum (approx. 66,383 tonnes fw), Agardhiella subulata and Hypnea cervicornis (approx. 36,714 and 28,305 tonnes fw, respectively). These species grow mainly free-floating and usually colonize the soft substrata of the lagoon. Two other invasive species, Sargassum muticum and Undaria pinnatifida, grow mainly on the docks of Venice historical centre, therefore their distribution is significantly more limited. Recent studies have shown that A. vermiculophyllum in protected, eutrophic areas produced a biomass of approx. 24 kg fw m-2 y-1. This species can replace Ulvaceae with positive effects on the environment and the presence of macrofaunal taxa. Indeed, historical data analysis shows that, despite the high presence of NIS, biodiversity is increasing. In addition, A. vermiculophyllum, S. muticum, U. pinnatifida, A. subulata and Solieria filiformis may be promising species for phycocolloid and antioxidant or cosmetic productions
Macroalghe o fanerogame acquatiche, una scelta ambientale per uno sviluppo sostenibile degli ambienti di transizione italiani.
No full textMacroalghe o fanerogame acquatiche, una scelta ambientale per uno sviluppo sostenibile degli ambienti di transizione italiani
Impact of driving factors on macrophyte dominance in the Italian transitional environments.
No full textEvoluzione dello stato trofico della laguna di Venezia negli ultimi 40 anni
Full text linkIn the Venice lagoon nutrient concentrations increased significantly up to the end of the 1990s both in surface sediments and water column. Consequently, abnormal biomasses of thionitrophilic macroalgae colonised the lagoon contributing to their further increase. In the successive years, both macroalgal biomass and nutrient concentrations declined and the ecological status of the lagoon increased. These trophic changes are presented by analysing their variation both in the central lagoon since the 1980 and in the whole lagoon from the early 2000s
Updating of non-indigenous macroalgae In the Italian coasts: new introductions and cryptic species.
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