1,720,971 research outputs found
Nursery function of coastal lagoons: implications of habitat connectivity for the management of lagoon habitats
No full textCoastal lagoons and their habitats perform an important nursery function for marine migrant (MM) fish species, which enter in these ecosystems to exploit the abundant trophic resources and the best biotic and abiotic conditions. The aim of this work is to study the nursery function carried out by shallow water habitats of the Venice lagoon, i) studying the sea-lagoon connectivity, ii) studying and characterizing the habitat preferences, iii) studying the trophic ecology of a target species (Sparus aurata).
In this work: i) analyzing the distribution of eggs, larvae and juveniles, collected with a bongo net and a seine net in the whole Venice lagoon, it was possible to observe that the north sub-basin is the one where MM are more concentrated, ii) developing predictive models on distribution of juveniles MM in different habitats of the north sub-basin, it was possible to observe how preferences towards environmental parameters and habitats change with ontogeny but in general saltmarshes were positively selected iii) analyzing diet, head morphology and stable isotope of S. aurata during ontogeny it was possible to observe the importance of tidal creek for the trophic ecology of this MM species.
Only through the integration of these methods it is possible to evaluate the complex nursery function of the lagoons, to direct the actions of restoration and management
IMPLEMENTATION OF THE HABITAT FISH BIO-INDICATOR IN TWO WATER BODIES OF THE VENICE LAGOON: THE ROLE OF SEASONAL AND ENVIRONMENTAL VARIABILITY IN THE ASSESSMENT OF ECOLOGICAL STATUS OF FISH FAUNA
Full text linkUnder the Water Framework Directive (WFD; Dir. 2000/60/EC), fish are one of the Biological Quality Elements that need to be taken into account when evaluating the Ecological Status of transitional water bodies. The Habitat Fish Bio-Indicator (HFBI), a multi-metric index composed of six descriptors based on functional traits of fish assemblages, was recently developed to assess Italian transitional waters. In this study, HFBI was applied, following the national application protocol, to two water bodies in the Venice lagoon featuring different water and sediment physco-chemical properties and habitat distribution. The analysis highlighted that, in addition to seasonality, environmental variability along confinement gradients and presence and extent of seagrass meadows strongly influence the six metrics, the HFBI score and the subsequent assessment outcome. The selection of number and location of sampling sites must then be based on environmental characteristic and variability found within each water body, and is therefore a crucial step in the evaluation of Ecological Status in transitional water ecosystems
Popolamenti microalgali in habitat a barene e loro contributo alla dieta del necton
No full textMicroalgae small-scale distribution was investigated to quantify their trophic role in the complexity of saltmarsh habitats. Sampling surveys were carried out in 2019 in the Venice lagoon (Italy), in three areas, inside the saltmarsh creek (ghebo) and outside. The nekton community was estimated by seine net and water and surface sediment samples were collected to determine microalgae taxonomic composition and biomass. Mean phythoplankton biomass increased from the more to the less confined areas and it was more abundant during summer and outside the ghebo. Microphytobenthos biomass, on the contrary, did non follow the confinement gradient and was more abudant in spring and inside the ghebo. Fish biomass had more density outside the ghebo. However, the juvenile belonging to the genus Chelon (30% of the nekton community biomass) was found to be more abundant inside the ghebo than outside and their stomachs contained numerous diatoms
FISH FAUNA IN THE VENICE LAGOON: UPDATING THE SPECIES LIST AND REVIEWING THE FUNCTIONAL CLASSIFICATION
Full text linkThis work aims at reviewing the existing ecological classification of fish fauna in the Venice lagoon, and updating the list of species found during 15+ years of research in this ecosystem. The checklist encompass all fish life stages including ichthyoplankton, and contains 94 taxa, with 14 recorded only after 2010. The new functional classification, made of eight guilds including two guilds of lagoon residents and two of marine migrants, highlights the differences
in species’ use of lagoon habitats in different seasons
Ingresso e distribuzione di uova, larve e giovanili di teleostei marini in laguna di Venezia: connettività mare-laguna e funzione di nursery
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