1,721,042 research outputs found
Studio preliminare delle associazioni di macroalghe e fanerogame marine per la valutazione dello stato ecologico delle lagune di Grado e Marano.
No full textMacrofite marine e applicazione di indici fitobentonici per la valutazione dello stato ecologico delle lagune di Grado e Marano.
No full textStudy of the macrophyte assemblages and application of phytobenthic indices to assess the ecological status of the Marano-Grado lagoon (Italy)
No full textCARATTERIZZAZIONE DELLO STATO DI QUALITÀ DELLE LAGUNE DI GRADO E MARANO MEDIANTE INDICI FITOBENTONICI.
No full textPreliminary macrophyte assemblage results to assess the ecological status of the Marano and Grado lagoons.
No full textFramework underpinning procedures of canopy-forming brown algae restoration in Mediterranean ecosystems in a global change scenario
No full textThe restoration of canopy-forming brown algae is a new, rather unexplored, discipline in Mediterranean coastal ecosystems (6 documented studies). In this biogeographic region the genus Cystoseira plays, as marine kelp forests, a key role as an ecosystem engineer. Rapid environmental changes and extreme climatic events are causing unpredictable phenological shifts in these foundation species, leading to their regression or loss. The
natural recovery is hampered by their limited egg and zygote dispersal. To implement large-scale actions, regulatory frameworks and practice standards are urgently required. Three restoration techniques have been implemented for Cystoseira species so far: i) transplanting juveniles or adults, ii) positioning fertile receptacles in the target area, iii) outplanting along the shore juveniles cultured in the nurseries. We propose an operational work-flow for optimizing: i) prioritization of restoration sites, ii) selection of donor sites and fertile material collection, iii) embryo culturing in the nurseries, iv) juvenile transport to the receiving sites and attachment on the rocky shore, according to bottom features and water depth, v) monitoring the restoration success. The aim is to maximize beneficial outcomes while minimizing costs in terms of time and resource allocation. Financial investments and stakeholder and community engagement, to change the awareness towards macroalgae and their role, are mandatory to achieve substantial restoration goals in marine ecosystems
BIODIVERSITY OF FUCALES IN THE USTICA ISLAND MARINE PROTECTED AREAS (TYRRHENIAN SEA, ITALY)
No full textFucales (Phaeophyceae) are ecosystem engineers and forest-forming macroalgae that are among the most productive and valuable carbon-rich marine benthic communities. In the Mediterranean, the predominant species belong to the genera Cystoseira sensu lato (s.l.) (i.e., Cystoseira sensu stricto, Ericaria, and Gongolaria) and Sargassum C. Agardh, which provide a number of important ecosystem functions and services. Increasing human threats and warming are affecting the species distribution, genetic diversity, functional responses and interactions of these valuable and vulnerable communities. In recent decades, populations of Cystoseira s.l. have significantly reduced their range. Therefore, there is an urgent need to assess the current distribution of the species, especially in MPAs, which play a fundamental role in valorization and conservation of these communities.
We present here an assessment of the occurrence and distribution of Fucales in the Ustica Island MPA (Tyrrhenian Sea, Italy), inferred from literature data. A high diversity was found, with 21 taxa of the complex Cystoseira sensu lato and 4 taxa of the genus Sargassum. The data presented here provide a necessary basis for the MPA to plan future monitoring activities and to record changes (expansion, regression and/or loss) in these valuable communities
Deep coralligenous outcrops of the Apulian continental shelf: Biodiversity and spatial variability of sediment-regulated assemblages
No full textStructure and spatial variability of coralligenous assemblages of the Apulian continental shelf in the southern Adriatic Sea were investigated. The area consists of small coralligenous outcrops distributed between 30 and 100 m of depth on coarse detritic or muddy bottom. Photographic samples, obtained through a Remotely Operated Vehicle, were analyzed to evaluate the abundance of the main taxa or morphological groups of macroalgae and sessile invertebrates, and the deposited sediment. A multifactorial sampling design was used to compare assemblages at two depth ranges, the shallow outcrops (between 35 and 45 m) and the deep outcrops (between 60 and 70 m), and to determine the main scales of spatial variation. Assemblages were dominated by encrusting and erect sponges, encrusting and filamentous algae, scleractinians, encrusting and erect bryozoans and the Zoantharia Parazoanthus axinellae. Deep assemblages were characterized by lower alpha and beta diversity, and by the decrease or disappearance of sensitive organisms, such as coralline macroalgae, scleractinians and erect bryozoans, and by the dominance of encrusting sponges, P. axinellae and hydrozoans. Sedimentation was higher on deep outcrops and was suggested to be the main driver of differences between shallow and deep assemblages. The peculiar composition of assemblages found in the Apulian continental shelf provides evidence that these outcrops represent an uncommon coralligenous habitat
First finding of a new encrusting coralline alga in the Adriatic Sea (Mediterranean)
No full textFirst finding of a new encrusting coralline alga in the Adriatic Sea (Mediterranean)
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