1,721,077 research outputs found
Feeding strategy of the sacoglossan opisthobranch Oxynoe olivacea on the tropical green alga Caulerpa taxifolia.
No full textThe feeding behaviour of the shelled sacoglossan Oxynoe olivacea was investigated to better understand the role and importance of this species in influencing encroachments of the alien alga Caulerpa taxifolia in the Mediterranean sea. We tested whether this slug preferred, as preliminary field observations suggested, an aggregative feeding behaviour and which part of the algal thallus, phylloid vs rhizoid, it preferred. Results showed that O. olivacea fed in groups and actively selected phylloid. This outcome poses important questions regarding the possibility that this species, fragmenting the alga thallus, could enhance dispersion and regeneration of C. taxifolia
Approccio multidisciplinare per lo sviluppo di un modello di pesca responsabile nella Sicilia Nord orientale: il ruolo della piccola pesca artigianale
No full textRehabilitation, using prosthetic implants, in patients with cancer of the oral cavity [Riabilitazione implanto protesica in pazienti trattati per neoplasia del cavo orale.]
No full textBACKGROUND: The number of patients treated for neoplasms of the oral cavity (by surgery and/or radiotherapy) requiring prosthesis rehabilitation using osteointegrated implants is increasing greatly. The objective of this research is to examine the correlation between prosthesis rehabilitation using osteointegrated implants, radiotherapy and the use of hyperbaric oxygen treatment in order to reduce the risk of osteoradionecrosis. METHODS: Research was carried out on 13 patients with 58 implants. The patients were divided into three sample groups: group A patients underwent radiotherapy (10 implants), group B patients did not undergo radiotherapy (29 implants) and group C patients first underwent radiotherapy and then hyperbaric oxygen treatment (19 implants). The group C patients first underwent hyperbaric oxygen treatment at 2.5 atmospheres. The osteointegrated implants were then applied and hyperbaric oxygen treatment was carried out again over 20-30 postoperative sittings without any other treatment between the sittings. The whole test period lasted 24 months. RESULTS: Only two implants were lost out of the 58 implants and they were in the group that had undergone radiotherapy. CONCLUSIONS: The results show how pre and postoperative hyperbaric oxygen treatment improves the success rate of osteointegrated implants in mandibular areas that had previously undergone radiotherapy. Moreover, the stability of the prostheses that are fixed to the implants is greatly improved compared to conventional methods
Genetic population structure of Epinephelus marginatus (Pisces, Serranidae) revealed by two molecular markers
No full textIn this paper, data are presented regarding the population structure of dusky grouper (Epinephelus marginatus) which was sampled in the Mediterranean Sea and Atlantic Ocean using two different molecular markers, ND2 RFLP and cytochrome b (cyt b) sequence analysis. The main objective of the study is to analyse the genetic variability of E. marginatus in the Mediterranean Sea to define how the biological characteristics of the species, such as the dispersal capability of pelagic larvae and the benthonic-sedentary life style, can affect the genetic population structure or maintaining the gene flow or determining genetic differences. Furthermore, we considered an Atlantic sample to establish the presence of genetic differences between the two biogeographical areas under consideration. Analysis of variation based on ND2 RFLP analysis revealed a genetic difference between the Atlantic and Mediterranean samples, whilst cyt b sequence analysis did not. There exists evidence for genetic differentiation for both molecular markers in the Mediterranean region. The majority of the variation was due to the Ustica Island sample and this could be due to differences in fisheries effort since the island is a protected area where recreational and professional fisheries are almost completely forbidden. The pattern of genetic diversity, haplotype networks and mismatch distribution suggest a historical influence on the genetic structure of E. marginatus and recent population expansion. An analysis of the genetic structure of the dusky grouper will be the prerequisite for decisions regarding conservation and fisheries management
Infestazione da plerocercoidi di Pterobothrium sp. (Cestoda, Pterobothriidae) in Xyrichthys novacula
No full textFish diversity associated with gas platforms: Evaluation of two underwater visual census techniques
Full text linkFish assemblages associated with offshore platforms were surveyed using two underwater visual census techniques: strip
transects and mobile point counts. Data were collected from four depth ranges at three platforms off Crotone, Italy (Ionian Sea).
A total of 25 fish species belonging to 12 families were recorded for the three platforms. Significant differences between
sampling methods and depth were observed in the fish assemblage structure, species richness and fish abundance. The mean
number of species recorded with the strip transect method was always greater than that obtained with mobile point counts, whilst
the opposite pattern was observed for mean abundances. Gregarious species such as Boops boops, Chromis chromis, Anthias
anthias and Oblada melanura were responsible for most of the differences in the assemblage structure. According to our results,
both methods allowed us to observe species that are not usually caught by means of fishing gear. When both census techniques
are used, they provide complementary information about the fish assemblages strictly associated with the platform structures
Factors affecting fish assemblages associated with gas platforms in the Mediterranean Sea
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Finding of a living population of Panopea glycimeris (Von Born, 1778) (Bivalvia; Hiatellidae) in Eastern Sicily (Mediterranean Sea)
Full text linkA consistent living population of Panopea glycimeris (von Born, 1778) was documented underwater along the eastern coast of Sicily. Twenty specimens were counted over an area of 1000 m(2), with an estimated total population of less than 300 individuals. The morphometric measurements of an adult specimen captured are provided. Proposals to adopt protection measures for this species are discussed
Resource partitioning among early colonizing Siganus luridus and native herbivorous fish in the Mediterranean: An integrated study based on gut-content analysis and stable isotope signatures
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