1,720,973 research outputs found
Accrescimento in long-line diMytilus galloprovincialisLmk. nello stagno di Calich (Sardegna nord-occidentale) = Growth of long-line culturedMytilus galloprovinciallsLmk. in the Calich Lagoon (North-Western Sardinia)
No full textThe Mediterranean musselMytilus galloprovincialis(Bivalvia, Mytilidae) was long-line cultured in
two different areas of the Calich Lagoon (NW Sardinia, Italy). Several physical and chemical water parameters,
chlorophyllaand sedimentation rate were measured in the two culture stations and in a third considered as a control. Mussel growth rate was similar in the two stations. It was positively affected by the
increase of water temperature and chlorophyllaconcentration and negatively by oxygen depletion
Predation risk of the sea urchin Paracentrotus lividus juveniles in an overfished area reveal system stability mechanisms and restocking challenges
No full textDistribuzione diCaulerpa racemosanel Golfo dell'Asinara (Sardegna settentrionale) = Distribution ofCaulerpa racemosain the Gulf of Asinara (NW Sardinia)
Full text linkCaulerpa racemosa(Chlorophyta), a non indigenous green alga from the Indo-Pacific, has been detected and mapped in the gulf of Asinara (NW Sardinia, Italy), to a depth of 30 m. The total covered area, mostly on "dead matte", is 776 ha and the interested coastline amounts to 13 km (44% of the total coastline investigated)
An Alternative suspended culture method for the Mediterranean carpet clam,Tapes decussatus(L.), in the Calich Lagoon (North Western Sardinia) = Un Metodo alternativo di allevamento in sospensione della vongola verace mediterranea,Tapes decussatus(L.), nello stagno di Calich (Sardegna nord occidentale)
Full text linkTapes decussatusseed was grown in two distinct groups of six suspended modules each placed at two different sites of the Calich lagoon from January to July 2004. Each module was composed of three stacked plastic baskets filled with coarse sand to prevent shell deformities. Statistical analyses showed significant differences in carpet clam survival at the two sites, while no differences in growth were detected
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Morphometric relationships and annual gonad index of the edible Sea urchinParacentrotus lividusfrom North Western Sardinia = Relazioni morfometriche e indice gonadico annuale del riccio di mare commestibileParacentrotus lividusnel nord ovest Sardegna
Full text linkWeight/diameter, weight/height and height/diameter morphometric relationships were calculated for a shallow rockyParacentrotus lividuspopulation sampled monthly near Alghero (Italy) from November 2004 to October 2005. Gonad index (GI) of the sea urchins was also evaluated. Statistical analyses showed significant differences of GI between 2 distinct periods of the year: late fall-winter and spring-late summer
Effetti delle misure di tutela sul riccio di mareParacentrotus lividusnell'area marina protetta di Capo Caccia-Isola Piana (Sardegna nord occidentale) = Protection effects on the sea urchinParacentrotus lividusat Capo Caccia - Isola Piana marine protected area (North Western Sardinia)
Full text linkDensity, test diameter and biomass alParacentrotus lividuswere evaluated in 2 locations within a Sardinian MPA and in 2 adjacent locations impacted by both professional and recreational fisheries.
All the variables considered showed significantly higher values within the MPA than at controls, confirming that this species demonstrates a positive response to protection from fishing inside marine reserves
Suspended culture ofOstrea edulisin the Calich lagoon (North western Sardinia, Italy): preliminary results
Full text linkSuspended culture is a widespread farming method used for many bivalve species such as mussels, oysters and
scallops. In the Mediterranean, this technique is mainly practised in lagoons or in sheltered coastal areas using
floating lines from which molluscs are suspended in several ways. In this study, the European flat oyster (Ostrea
edulisLinné, 1758) was grown in suspended lantern nets in the Calich lagoon (Sardinia, Mediterranean Sea) from
March 2004 to March 2005. Two distinct groups of 6 lanterns each were hung to longline ropes near the mouth (station
1) and in the central portion of the lagoon (station 2). In each lantern (diameter=50cm; height=30cm), 90O.
edulisspecimens were grown and, in order to ensure good water circulation inside the lantern net, fouling organisms
were removed every month. Overall mortality, shell length (anterior-posterior axis), shell width (maximum
distance on the lateral axis, between both valves of the closed shell) and total wet weight of a 180 specimen oyster
sample (30 from each lantern) were recorded every 2 months at each site. In addition, water temperature, salinity,
dissolved oxygen, and pH were monitored monthly by means of a multi-parametric probe at both sites (between
10a.m. and 12p.m.). One-way ANOVA was used to test for differences in oyster final mean morphometric characters
recorded at the 2 growing stations. Chi-square test (with Yates correction for continuity) was performed to compare
survival rates at the end of the trial. From an initial mean shell length of 49.5±4.6mm,O. edulisgrowth rate
showed a similar trend at both the stations. Nevertheless, ANOVA detected significant differences (F=7.10; p<0.01)
in final mean oyster length values (83.7±6.5mm at station 1 vs 81.7±7.6mm at station 2). Significant differences
(F=9.74; p<0.01) were also found in final mean oyster width (28.4±3.1mm at station 1vs27.5±2.8mm at station 2)
and weight (F=4.00; p<0.05) values (91.4±16.7g at station 1vs87.7±18.3g at station 2). Moreover, chi-square test
revealed a significantly different survival rate (χ2=10.04; p<0.01) between the 2 groups (57.4% at station 1 vs 47.6%
at station 2).Water temperature, salinity, dissolved oxygen, and pH monthly values recorded at the 2 growing stations
were almost identical. Thus, the observed differences in oyster growth and survival seemed not to be due to
the hydrological variables considered. Instead, they could probably be related to mechanical and chemical effects of
water renewal by coastal waters, which may have led to different seasonal seston food supplies at the 2 sites. The
suspended culture of the European flat oyster described in this paper can increase the mollusc production of the
Calich lagoon by growing a valuable bivalve species which is naturally scarce in this biotope. In fact, our preliminary
results showed good survival and growth rates ofO. edulisespecially near the mouth of the lagoon.
Furthermore, this farming technique could be a possible source of economic benefits for local fishermen and, above
all, a low impact aquacultural activity compatible with the environment
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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