102,366 research outputs found
Especies de Chone Kroyer, 1856 (Polychaeta: Sabellidae) del Atlántico Oriental Central y Mar Mediterráneo
No full textA neotype specimen is designated for Chone acustica (Claparède, 1870) with a full description. The original descriptions of Chone arenicola Langerhans, 1880 and Chone collaris Langerhans, 1880, both from Madeira, did not include some details and incomplete or misleading information was provided, so both species are redescribed. Amendments to the description of Chone longiseta Giangrande, 1992 are also given together with the methyl green staining pattern of Chone usticensis Giangrande et al. 2006. Two new species are described: Chone gambiae sp. nov., from the Gulf of Naples and Chone dunerificta sp. nov., from the Gulf of Salerno. This study shows the distribution of Chone duneri Krøyer, 1856, and Chone filicaudata Southern, 1914, to be restricted to the Arctic seas and North Atlantic Ocean, respectively. Records from the Mediterranean Sea are found to be erroneous.Se designó el neotipo de Chone acustica (Claparède, 1870). Las descripciones originales de Chone arenicola Langerhans, 1880 y Chone collaris Langerhans, 1880, ambas de Madeira, no incluyen carácteres diagnósticos y la información proporcionada en otras contribuciones es incompleta, en este estudio ambas especies fueron redescritas. Se adicionaron carácteres diagnósticos a la descripción de Chone longiseta Giangrande, 1992, y se describió el patrón de tinción con verde de metilo de Chone usticensis Giangrande et al. 2006. Se describieron dos nuevas especies: Chone gambiae sp. nov., del Golfo de Nápoles y Chone dunerificta sp. nov., del Golfo de Salerno. Se restringió la distribución de Chone duneri Krøyer, 1856 para los mares del Ártico y Chone filicaudata Southern, 1914 para el Océano Atlántico Norte. Los registros de ambas especies para el Mar Mediterráneo son erróneos
Z Andromedae
No full textZ ANDROMEDAE G. Baratta, Rome Observatory; A. Altamore, Rome University; A. Cassatella, European Space Agency, Madrid; and A. Giangrande, O. Ricciardi and R. Viotti, Laboratorio di Astrofisica Spaziale, Frascati, report that new ultraviolet spectra of Z And obtained with the International Ultraviolet Explorer on Feb. 17 showed no significant change in the emission lines. The minimum electron density in the emitting region was 10**9 cm**-3. The optical spectrum, obtained at Campo Imperatore, and the luminosity are still those of the quiescent phase
On Moschus' Megara
No full textGiangrande G. On Moschus' Megara. In: L'antiquité classique, Tome 66, 1997. pp. 261-269
ANTAGONISMO, COOPERAZIONE E BIODIVERSITÁ
No full textDirect and indirect biotic interactions driving community structure, can be positive,
increasing the fitness of both partners, or negative, often increasing the fitness of only one of the
participant to the interaction. Moreover, partner interaction may produce an integration among them,
thus giving rise to an association defined as symbiosis, with parasitism and mutualism as the two extremes
of a symbiotic continuum. In the past, negative interactions have been considered more widespread within
communities and responsible for most of their structures. They have also been studied by an experimental
approach. By contrast, cooperative interactions have mainly approached with a descriptive aspect.
Negative interactions are more abundant in benign environments, whilst positive ones develop according
to the environmental harshness with different organisms cooperating to cope environmental stress.
Both parasitism and mutualism can evolve from a commensal interaction depending from the
ecological context and have a different role in promoting evolution. In turn commensalism can evolve from
epibiosis, a widespread phenomenon in marine benthic environment where the high spatial competition
promotes the overgrowth of organisms. Therefore epibiosis is the starting point for further evolution
of different kind of interactions. We describe some examples of mutualisms in marine environment,
underlining how such interactions can lead to the increase of biodiversity
Experimental co-culture of low food-chain organisms, Sabella spallanzanii (Polychaeta, Sabellidae) and Cladophora prolifera (Chlorophyta, Cladophorales), in Porto Cesareo area (Mediterranean Sea)
No full textThe filter feeder polychaete Sabella spallanzanii (Gmelin) was co-cultured with the green seaweed Cladophora prolifera (Roth.) Kunz, in an off-shore experimental system. Both species have previously been experimented as bioremediator organisms for waste treatment deriving from aquaculture farms and can have a high economic value as a byproduct of polyculture. The present experiment has been conducted in an area 2 miles off the coast of Porto Cesareo (Ionian sea, Southern Italy). The growth was followed in some modules anchored to the bottom at two different depths (15 and 25 m depth). The results indicate differences among replicates located at different depths. Both organisms show a faster growth at the shallower levels. Within this level, polychaetes reached a mean biomass of 860 +/- 74 mg dw (average +/- SE) per worm, 30 times larger than that of the starting point, after a standstill in the first period, probably due to the manipulation activities. The major growth has been recorded during the winter. Algae have shown an increase of 34 g ww month(-1) (average +/- SE) in the shallower levels vs. only 11 g ww month(-1) (average +/- SE) in the deeper levels. The RGR calculated after 60 days was 115% in the shallower levels vs. about 60% in the deeper ones. A considerable decrease in growth rate was observed during the last period; this was probably due to the presence of increasing fouling community on the rearing cages surely affecting the light intensit
Flynn-MIMIC
No full textThis project includes supplementary information related to the 2025 preprint by Giangrande et al. entitled "To g or not to g? A Cross-Domain, Subtest-Level Investigation of the Flynn Effect Across Ages 7-15 Years." The Supplementary Materials can be found under the Files tab. Code is available at https://github.com/egiangrande/Flynn-MIMI
Experimental co-culture of low food-chain organisms, Sabella spallanzanii (Polychaeta, Sabellidae) and Cladophora prolifera (Chlorophyta, Cladophorales), in Porto Cesareo area (Mediterranean Sea)
No full textThe filter feeder polychaete Sabella spallanzanii (Gmelin) was co-cultured with the green seaweed Cladophora prolifera (Roth.) Kunz, in an off-shore experimental system. Both species have previously been experimented as bioremediator organisms for waste treatment deriving from aquaculture farms and can have a high economic value as a byproduct of polyculture. The present experiment has been conducted in an area 2 miles off the coast of Porto Cesareo (Ionian sea, Southern Italy). The growth was followed in some modules anchored to the bottom at two different depths (15 and 25 m depth). The results indicate differences among replicates located at different depths. Both organisms show a faster growth at the shallower levels. Within this level, polychaetes reached a mean biomass of 860 ± 74 mg dw (average ± SE) per worm, 30 times larger than that of the starting point, after a standstill in the first period, probably due to the manipulation activities. The major growth has been recorded during the winter. Algae have shown an increase of 34 g ww month-1 (average ± SE) in the shallower levels vs. only 11 g ww month -1 (average ± SE) in the deeper levels. The RGR calculated after 60 days was 115% in the shallower levels vs. about 60% in the deeper ones. A considerable decrease in growth rate was observed during the last period; this was probably due to the presence of increasing fouling community on the rearing cages surely affecting the light intensity. © 2006 The Authors
Redescription and systematics position of Pseudofabricia aberrans (Polychaeta, Sabellidae)
No full textClearance rates of Sabella spallanzanii and Branchiomma luctuosum (Annelida : Polychaeta) on a pure culture of Vibrio alginolyticus
No full textThe influence exerted by filter-feeding activity on bacterial density by two sabellid species from the Mediterranean Sea (Ionian Sea, Italy), Branchiomma lucluosum Grube and Sabella spallanzanii Gmelin (Annelida: Polychaeta) was investigated. Clearance rates and retention efficiencies were estimated utilizing the species Vibrio alginolyticus selected on account of previous field studies and its importance in fish Culture pathogenicity. The C-max was 43.2 +/- 2.63 L h(-1) g(-1) DW for B. luctuosum and 12.4 +/- 2.22 L h(-1) g(-1) DW for S. spallanzanii. The Retention efficiency was 98% corresponding to a removed bacterial biomass of 44.8 + 7.88 mu gC L-1 g(-1) DW for B. luctuosum and 70% corresponding to a bacterial biomass of 23.8 + 2.95 mu gC L-1 g(-1) DW for S. spallanzanii. Maximum retention was recorded after 20 min for the first species and after 30 min for the second one. Present laboratory experiments represent a contribution to the knowledge of the filtration activity of the two polychaetes, characterizing the filtration process on bacterioplankton. Both species resulted extremely efficient in removing V. alginolyticus from seawater in experimental tanks, thus confirming the previous data from the field studies and suggesting their employment as biofilters of microbially contaminated waters in intensive aquacultur
Plutarco, Narrazioni d'amore, intr., trad., e commento a cura di G. Giangrande, Napoli, M. D'Auria Editore, 1991, 89 pp. ISBN 88-7092-079-8
No full textReseña de Plutarco, Narrazioni d'amore, intr., trad., e commento a cura di G. Giangrande, Napoli, M. D'Auria Editore, 1991, 89 pp. ISBN 88-7092-079-
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