1,721,160 research outputs found
The D-1 antagonist SCH 23390 stimulates while the D-1 agonist SKF 38393 fails to affect dopamine release in the dorsal caudate of freely moving rats.
No full textSCH 23390, from doses of 0.012 mg/kg s.c., dose dependently stimulated the release of dopamine (DA) and the output of its metabolites, dihydroxyphenylacetic acid and homovanillic acid, in the dorsal caudate of freely moving rats implanted with transcerebral dialysis fibers. SKF 38393 failed to modify DA release and metabolism at doses of 5, 10 and 25 mg/kg s.c. but at 25 mg/kg s.c. it abolished the effect of 0.025 mg/kg of SCH 23390. Administration of gamma-butyrolactone (700 mg/kg s.c.), which blocks the firing of DA neurons, prevented the effect of 0.050 mg/kg s.c. SCH 23390. The results indicate that D-1 receptors control the release of DA, probably through stimulation of the firing of DA neurons
I percorsi scolastici lavorativi dei diplomati toscani: prime analisi sulla coorte 1996-96
No full textNicotine preferentially stimulates dopamine release in the limbic system of freely moving rats.
No full textOpposite effects of μ and k opiate agonists on dopamine release in the nucleus accumbens of freely moving rats
No full textStatistica Aziendale
No full textIl volume, a carattere didattico, tratta gli argomenti e i metodi statistici più rilevanti per le analisi aziendali: dall'informazione statistica per le imprese ai metodi di campionamento, dal modello di regressione multivariata alle altre tecniche di analisi multidimensionale, all'analisi della produttività e della efficienza aziendale
Drug of abuse preferentially stimulate dopamine release in the mesolimbic system of freely moving rats: a brain dialysis study
No full textIMPACT OF Phalacrocorax carbo sinensis (AVES, PHALACROCORACIDE) ON TRANSITIONAL ENVIRONMENTS IN CENTRAL-WESTERN SARDINIA
No full textIMPACT OF Phalacrocorax carbo sinensis (AVES, PHALACROCORACIDE) ON TRANSITIONAL ENVIRONMENTS IN CENTRAL-WESTERN SARDINIA
1BUTTU S., 1MULAS A., 1PALMAS F.
1Dipartimento di Scienze della Vita e dell’Ambiente – Università degli Studi di Cagliari,
Via T.Fiorelli, 1 – 09126, Cagliari
[email protected]
Sardinia, for its peculiar environmental characteristics, the relative abundance and the quality of its lagoons and ponds, hosts the biggest wintering population of the Cormorant (Phalacrocorax carbo sinensis) on the Italian territory. Since the early ‘80s this species has began to rise considerably, probably due to conservation programs held in North Europe colonies. This fast population growth is cause of major concern among fishermen, afraid for the loss of the fish stocks.
In this work we analyse, through the mucous mixtures method (flock or bolus), the diet composition of the cormorants from the colony located in Cabras lagoon dormitory (ZPS ITB034008), to evaluate which species were more preyed and their impact on fisheries. The study of the diet was conducted during the wintering season 2010/2011, between October and March. A total of 438 pellets were collected. Through morphological analysis of hard body parts, such as otoliths found in the flock, it was possible to evaluate biomass and prey species composition as well as the average daily consumption.
The trophic spectrum was dominated almost exclusively by euryhaline fish species. The most important preys, by frequency of occurrence, belonged to Mugilidae (86%), Moronidae (7%), Atherinidae (4%) and Sparidae (3%) families. Regarding the qualitative composition of the diet, Mugilidae (mainly Liza spp. and Mugil spp. ) showed the highest index of relative importance (%IRI = 97,656). Moronidae (%IRI = 2,185) represented the second most important prey taxon, while Sparidae were the less (%IRI = 0,001). The values of percentage prey biomass of the entire wintering season amounted to 87% for Mugilidae and 10% for Moronidae, while the remaining 3% is represented by other prey taxa. Based on the data collected, it was estimated an average daily consumption (Daily Food Intake) of 478.4 g / day for example.
The Cabras lagoon represents the main Cormorants feeding area in Sardinia, with the highest concentration of specimens of the entire island. This fragile system seems to have reached, for some years, the carrying capacity in terms of presence of ichthyophagous birds, and it appears to have established a situation of balance between the various components of the ecosystem, which still requires constant monitoring
Impact of Phalacrocorax carbo sinensis (Aves, Palacrocoracide) on transitional environments in Central-Western Sardinia
No full textIMPACT OF Phalacrocorax carbo sinensis (AVES, PHALACROCORACIDE) ON TRANSITIONAL ENVIRONMENTS IN CENTRAL-WESTERN SARDINIA
1BUTTU S., 1MULAS A., 1PALMAS F.
1Dipartimento di Scienze della Vita e dell’Ambiente – Università degli Studi di Cagliari,
Via T.Fiorelli, 1 – 09126, Cagliari
[email protected]
Sardinia, for its peculiar environmental characteristics, the relative abundance and the quality of its lagoons and ponds, hosts the biggest wintering population of the Cormorant (Phalacrocorax carbo sinensis) on the Italian territory. Since the early ‘80s this species has began to rise considerably, probably due to conservation programs held in North Europe colonies. This fast population growth is cause of major concern among fishermen, afraid for the loss of the fish stocks.
In this work we analyse, through the mucous mixtures method (flock or bolus), the diet composition of the cormorants from the colony located in Cabras lagoon dormitory (ZPS ITB034008), to evaluate which species were more preyed and their impact on fisheries. The study of the diet was conducted during the wintering season 2010/2011, between October and March. A total of 438 pellets were collected. Through morphological analysis of hard body parts, such as otoliths found in the flock, it was possible to evaluate biomass and prey species composition as well as the average daily consumption.
The trophic spectrum was dominated almost exclusively by euryhaline fish species. The most important preys, by frequency of occurrence, belonged to Mugilidae (86%), Moronidae (7%), Atherinidae (4%) and Sparidae (3%) families. Regarding the qualitative composition of the diet, Mugilidae (mainly Liza spp. and Mugil spp. ) showed the highest index of relative importance (%IRI = 97,656). Moronidae (%IRI = 2,185) represented the second most important prey taxon, while Sparidae were the less (%IRI = 0,001). The values of percentage prey biomass of the entire wintering season amounted to 87% for Mugilidae and 10% for Moronidae, while the remaining 3% is represented by other prey taxa. Based on the data collected, it was estimated an average daily consumption (Daily Food Intake) of 478.4 g / day for example.
The Cabras lagoon represents the main Cormorants feeding area in Sardinia, with the highest concentration of specimens of the entire island. This fragile system seems to have reached, for some years, the carrying capacity in terms of presence of ichthyophagous birds, and it appears to have established a situation of balance between the various components of the ecosystem, which still requires constant monitoring
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