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Bedini R.,Istituto di Biologia Ed Ecologia Marina | Pertusati M.,Centro Interuniversitario Of Biologia Marina Ed Ecologia Applicata | Batistini F.,Istituto di Biologia Ed Ecologia Marina | Piazzi L.,Istituto di Biologia Ed Ecologia Marina
Acta Adriatica | Year: 2011

The present study assesses the spatial and temporal distribution of motile invertebrates in Posidonia oceanica meadows located off the coast of Tuscany, in the northwestern Mediterranean Sea. A hierarchical sampling design was used to evaluate changes in composition and abundance of assemblages in relation to depth and to different periods over one year. A total of 136 taxa were determined, among them 34 Mollusca, 94 Arthropoda, 5 Annelida and 1 Echinodermata. Results of both multivariate and univariate analyses showed that the macro-invertebrate assemblage structure varied along a depth gradient but this pattern was not consistent in the two study periods. Results suggest that temporal and spatial differences in the structure of P. oceanica meadows are key drivers in determining the structure of associated macro-invertebrate assemblages, as values of richness and abundance decreased with a decrease in leaf length and shoot density. Source


Bedini R.,Istituto di Biologia Ed Ecologia Marina | Bedini M.,Istituto di Biologia Ed Ecologia Marina | Bonechi L.,Istituto di Biologia Ed Ecologia Marina | Piazzi L.,University of Sassari
Marine Biology Research | Year: 2015

Abstract: The study compared mobile macro-invertebrate assemblages invaded by the two turf-forming invasive macroalgae Womersleyella setacea and Lophocladia lallemandii with non-invaded assemblages. The study was carried out at Pianosa Island, in the Tuscan Archipelago National Park, within the depth ranges where the two invasive species showed high abundance: 35 m depth for Womersleyella setacea and 10 m depth for Lophocladia lallemandii. Results showed significant differences between invaded sites and non-invaded ones for the two turf-forming Rhodophyta. Invaded assemblages showed a lower species richness and a reduction of decapods and molluscs and an increase of polychaetes compared with non-invaded ones. Amphipods showed a drastic reduction in abundance in sites invaded by W. setacea, while they appeared less influenced by the presence of L. lallemandii. Womersleyella setacea showed more severe effects than L. lallemandii, causing deep changes in the structure of assemblages and a reduction of beta diversity of the system. © 2014, © 2014 Taylor & Francis. Source


Bedini R.,Istituto di Biologia Ed Ecologia Marina | Bonechi L.,Istituto di Biologia Ed Ecologia Marina | Piazzi L.,Istituto di Biologia Ed Ecologia Marina
Cryptogamie, Algologie | Year: 2011

This paper describes the distribution and patterns of spread of the red alga Lophocladia lallemandii in the Tuscan Archipelago (NW Mediterranean Sea). Lophocladia lallemandii is recorded from three islands of the archipelago. Invasive traits were only detected at Pianosa Island where the affected stretch of coast has increased from 1.2 km in 2008 to 10.7 km in 2010. The abundance of the alga was found to increase with depth and strong differences among habitats were found in shallow stands. The presence of populations of Cystoseira spp. seemed to facilitate the spread of the alga. In Cystoseira assemblages, the biomass of L. lallemandii could represent up to 44 % of the biomass of Cystoseira spp. and epiphytes. The ability of L. lallemandii to colonize canopy species exposes habitats ecologically important to be invaded, and contradicts the classic concept of ecosystem resistance to biological invasions. © 2011 Adac. Source


Bedini R.,Istituto di Biologia Ed Ecologia Marina | Bonechi L.,Istituto di Biologia Ed Ecologia Marina | Piazzi L.,Istituto di Biologia Ed Ecologia Marina
Mediterranean Marine Science | Year: 2014

The study aimed to investigate patterns of spatial and temporal variability of mobile macroinvertebrate assemblages associated to coralligenous habitat. A multi-factorial sampling design was used to test the hypotheses that the structure of assemblages and their spatial and temporal variability changed in relation to substrate inclination. Moreover, macroalgae and sessile macro-invertebrates were also investigated in order to detect eventual relationships between sessile and mobile assemblages. A total of 236 mobile macro-invertebrate taxa were identified, among them 2 Platyhelminthes, 4 Sipuncula, 6 Nemertea, 27 Mollusca, 86 Annelida, 103 Arthropoda, 8 Echinodermata. The results of the study show that mobile macro-invertebrate assemblages of coralligenous habitat were little influenced by the inclination of substrate and by the morphology of sessile organisms, as patterns of variation were different between the two assemblages. Mobile macro-invertebrate assemblages changed among sampling dates within a one-year period and showed high variability at the spatial scale examined. Source


The study compared the structure of mobile epifaunal assemblages associated with Mediterranean Cystoseira beds between areas invaded and not invaded by Lophocladia lallemandii. A total of 150 taxa were identified: 42 Polychaeta, 78 Arthropoda, 26 Mollusca and 4 Echinodermata. Epifaunal assemblages differed between areas invaded and not invaded by Lophocladia lallemandii when the invasive species reached maximum values of cover and biomass, while differences between conditions were not significant in other periods of the year. The main differences were the greater abundance of amphipods, isopods and polychaetes in invaded areas and the greater abundance of molluscs and decapods in non-invaded areas, while richness and total abundance of organisms were not significantly different between conditions. The effects of Lophocladia lallemandii invasion on Cystoseira-associated assemblages seem to be limited to the period of vegetative growth of the alga and reversible during the period of its vegetative rest. © 2014 CSIC. Source

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