Search results for "Rifo"
showing 10 items of 480 documents
Recuperación y reintroducción de Marsilea quadrifolia en los arrozales del delta del Ebro (Tarragona, España).
2001
ESTRELLES, E., IBARS, A. M., IRANZO, J. & MORALES, F. 2001. Recuperation and reintroduction of Marsilea quadrifolia in the rice fields of the Ebro's Delta (Tarragona, Spain). Bot. Complutensis 25: 251-259. Marsilea quadrifolia has got to be a extincted species in the Ebro's Delta. In this work the process of recovery of the species is described by sporocarps localization in the soil, germination of the same ones in the laboratory and cultivation in pots of the obtained sporelings, from which we proceeded to the reintroduction of Marsilea quadrifolia in old rice fields inside the land of the Natural Park, as well as the conservation measures ex situ applied on this species that tradition…
Does plant growth phase determine the response of plants and soil organisms to defoliation?
2005
Abstract To test a hypothesis that the effects of defoliation on plant ecophysiology and soil organisms depend on the timing of defoliation within a growing season, we established a greenhouse experiment using replicated grassland microcosms. Each microcosms was composed of three plant species, Trifolium repens , Plantago lanceolata and Phleum pratense , growing in grassland soil with a diverse soil community. The experiment consisted of two treatment factors—defoliation and plant growth phase (PGP)—in a fully factorial design. Defoliation had two categories, i.e. no trimming or trimming a total of four times at 2 week intervals. The PGP treatment had four categories, i.e. 1, 3, 7 or 13 wee…
La crisi economica e identitaria delle amministrazioni locali e l'abolizione delle province
2014
Enti religiosi/ecclesiastici e riforma del Terzo settore
2018
“La recente riforma del Terzo settore con cui è stata legislativamente ristrutturata tutta la materia del non profit italiano, presenta diversi aspetti critici legati alla sua attuazione che necessitano di essere chiariti. In particolare, si pongono particolari problemi applicativi con riferimento alla categoria degli “enti religiosi civilmente riconosciuti” individuata dal legislatore. A parte i dubbi ermeneutici creati dalla terminologia adottata, vi sono anche delle difficoltà connesse alle potenziali incompatibilità della nuova disciplina del Terzo settore con le caratteristiche strutturali degli enti di matrice religiosa. Il volume, in attesa che giungano chiarimenti dalla giurispruden…
The use of blue tit eggs as a biomonitoring tool for organohalogenated pollutants in the European environment
2010
In the present study, large scale geographical variation in the occurrence of organohalogenated pollutants (OHPs) was investigated throughout Europe using eggs of a terrestrial resident passerine species, the blue tit (Cyanistes caeruleus). Blue tit eggs from 10 sampling locations, involving suburban, rural and remote areas, in 7 European countries were collected and analysed. Sum polychlorinated biphenyl (PCB) levels ranged from 150 ng/g lipid weight (lw) to 2003 ng/g lw. Sum polybrominated diphenyl ethers (PBDEs) ranged from 3.95 ng/g lw to 114 ng/g lw. As expected, PCB and PBDE concentrations were significantly higher in the sampled suburban locations compared to the rural and remote loc…
Ecological risk assessment of pesticides in urban streams of the Brazilian Amazon
2022
Abstract The use of pesticides in households and peri-urban areas of the Amazon has increased notably during the last years. Yet, the presence of these contaminants in Amazonian freshwater ecosystems remains unexplored. Here, we assessed the exposure to 18 pesticides and 5 transformation products in the Amazon River and in the urban streams of Manaus, Santarem, Macapa, and Belem (Brazil). Pesticide concentrations were analyzed by liquid and gas chromatography methods. Ecological risks were assessed following a two-tiered approach. First, hazard quotients and an overall hazard index were calculated using toxicity data for standard test species of primary producers, invertebrates, and fish. S…
<p><strong>Lectotypification of six names of species of <em>Scabiosa</em> s.l. (Caprifoliaceae) endemic to North Africa and r…
2020
As part of an ongoing project for the investigation of the Algerian-Tunisian flora, six names of species of Caprifoliaceae subfam. Dipsacaceae, endemic to central and western North Africa, described in the 19th and 20th Centuries under the genus Scabiosa, are here lectotypified. They are: Scabiosa camelorum Cosson & Durieu, Scabiosa cartenniana Pons & Quézel, Scabiosa daucoides Desf., Scabiosa farinosa Cosson, Scabiosa parielii Maire, and Scabiosa robertii Barratte. Taxonomic notes, distributisson and new unpublished data about plant phenology of these taxa are given.
Empirical evidence of non-linearity in bottom-up effect in a marine predator-prey system
2022
Strength of species interaction may have profound effects on population dynamics. Empirical estimates of interaction strength is often based on the assumption that the interaction strengths are constant. Barents Sea cod and capelin are two fish populations for which such interaction has been acknowledged and used, under the assumption of constant interaction strength, when studying their population dynamics. However, species interaction can often be non-linear in marine ecosystems and might profoundly change our understanding of food chains. Analysing 37 years long survey time series in the Arcto-Boreal Barents Sea with a state-space modelling framework, we demonstrate that the effect of ca…
Assessment of the efficacy of Artemia sp (Crustacea) cysts chorion as barrier to chlorpyrifos (organophosphorus pesticide) exposure. Effect on hatchi…
2005
In order to reveal the efficacy of the Artemia cysts chorion as barrier to the organophosphorus pesticide chlorpyrifos, whole and decapsulated cysts have been exposed to 10 mg L(-1) chlorpyrifos in sea water during hydration and hatching phase, separately. The concentration of chlorpyrifos in capsulated and decapsulated cysts after exposure has been determined in order to elucidate the efficacy of chorion as protection to the embryo. The results obtained demonstrate the ability of the cysts chorion to obstruct the pass of chlorpyrifos molecules through this protection structure. Thus, the concentration of chlorpyrifos in exposed decapsulated cysts is higher than in exposed whole cysts. More…
Francesco Crispi le riforme amministrative. Il primo intervento di riforma strutturale dello Stato unitario
2023
Questo contributo analizza il rapporto tra le riforme propugnate dai Governi guidati da Francesco Crispi (ben quattro, tra il 1887 ed il 1891 e tra il 1894 ed 1896) ed il loro artefice, con uno sguardo d’insieme sul complesso processo di modernizzazione dell’Italia che si affacciava al “secolo breve” con un’organizzazione amministrativa arcaica. Partendo dalla formazione giuridica dello statista siciliano, dagli scritti giovanili, dall’attività professionale, dalla cultura risorgimentale e costituzionale che ne forgiarono la personalità e poi dall’attività rivoluzionaria e parlamentare, lo studio perlustra il variegato contesto nel quale proruppe quell’“impeto riformatore dell’amministrazio…