1,720,994 research outputs found
Distribuzione del novellame di Mugilidi (Pisces, Mugilidae) e di spigola (Pisces, Moronidae) in habitat costieri italiani a differente tipologia
No full textVariazioni della dieta di Zosterisessor ophiocephalus in relazione ad età e tipologia di habitat in laguna di Venezia
No full textFish assemblage response to environmental pressures in the Venice lagoon
No full text1 - Venice lagoon (Italy), being a transitional water environment, is subjected to several environmental pressures of anthropogenic origin, with a likely impact on the overall ecological status of the system.
2 - Following the Water Framework Directive (WFD, Directive 2000/60/CE), water bodies are to be characterised by the pressures acting on them, and fish assemblages can be used as biological quality element of their ecological status. The Venice lagoon basin has been divided into 14 water bodies, belonging to 5 types, according to the national classification.
3 – With the aim of comparing the role of anthropogenic pressures and environmental background in affecting the lagoon fish assemblages, human pressures have been identified and their magnitude quantified in each lagoon water body, with particular reference to 3 pressure categories: pollution (including nutrient enrichment), direct pressures on the habitat and the living organisms (with particular regard to fishes), and indirect pressures deriving from ground occupation (adjacent land uses).
4 – Fish assemblage attributes (both taxonomical and functional), in sites located within 4 lagoon water bodies (fish samples were collected in 2001-2002 by using fyke nets), were related to the respective pressures acting on these water bodies, by taking into account also the contribution of natural environmental variability among the studied areas, including habitat diversity.
5 - Results showed similar significant effects of environmental variables and anthropogenic pressures on the lagoon fish assemblages. This highlights the importance of controlling for environmental variability to allow the detection of the signal of human impact on biological assemblages when attempting at the evaluation of lagoon ecological status
Occurrence and intensity of intercohort cannibalism of post-hatching stages in the broad-nosed pipefish, Syngnathus typhle
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Variazione della comunità ittica lungo un gradiente ambientale sui bassi fondali della Laguna di Venezia
No full textPubblicazione online edited by Claudio Comoglio, Elena Comino, e Francesca Bona http://www.xvcongresso.societaitalianaecologia.org/articles/Franco-41.pd
Dietary differences in three pipefish species (Osteichthyes, Syngnathidae) related to the snout morphology
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Far from home. Genetic variability of Knipowitschia sp. from Italy revealed unexpected species in coastal lagoons of the Tyrrhenian coast
No full textCoastal lagoons are resilient and productive ecosystems that support high biological and habitat diversity, but are increasingly affected by several threats due to human exploitation. Many resident species of these environments show a restricted geographical range and a strict association with specific habitats, thus they could represent ecological indicators of these ecosystems. Data on the genetic variability distribution in populations of these species are crucial to identify the presence of different evolutionary units across their geographical distribution ranges and to plan actions for their management and conservation. In this context, the assessment of the genetic variability and structure of Italian specimens of the Adriatic dwarf goby Knipowitschia panizzae, a brackish species endemic in the Adriatic Sea, and included among the species of Community interest in Annex II of Habitats Directive, was carried out. To this purpose, goby samples were collected both from Italian sites where the species is native (Adriatic) and non-native (Tyrrhenian), probably introduced due to the practice of stocking lakes and coastal lagoons with juvenile of euryhaline species to sustain local fisheries. Results show the presence of high values of haplotype diversity, and no shared haplotypes between fish from sites where the species is native or introduced. Moreover, in Tyrrhenian Italian lagoons we identified an allochthonous species of Knipowitschia, previously undetected in Italy: the Corfu dwarf goby K. goerneri. This species was originally described as endemic to the Korission Lagoon catchment on Corfu Island, but recently found also in Butrinti lagoon in Albania. The presence of this species, that almost totally replaced Adriatic dwarf goby in the Tyrrhenian lagoons under study, can be ascribed to the stockings of wild fry of commercially important species originating from Balkan countries
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