Search results for "RITU"

Decomposition rate and invertebrate colonization of seagrass detritus along a hydrodynamic gradient in a Mediterranean coastal basin: The Stagnone di…

2019

International audience; Seagrass leaf litter decomposition is a key component of marine carbon flow driven by both biotic and abiotic factors, including water movement. In this study, we analyse Posidonia oceanica litter decomposition and invertebrate colonization in three sites with different hydrodynamics in a coastal basin. Litterbags were put on the sea bed along a gradient of distance from the open sea, implying a different level of water exchange. Leaf litter mass loss and carbon and nitrogen concentration were analysed, and density and biomass of benthic invertebrates colonizing litterbags were recorded after 3, 7, 14, 47, 101, 152 and 221 days. Results showed that in the most shelte…

The role and contribution of the seagrass Posidonia oceanica (L.) Delile organic matter for secondary consumers as revealed by carbon and nitrogen st…

2002

The δ13C and δ15N values of primary producers and consumers were studied to obtain information on the trophic role of Posidonia oceanica L. Delile, the dominant primary producer, in a Mediterranean shallow environment (the Stagnone di Marsala, western Sicily). δ13C strongly discriminated between pelagic and benthic pathways, with the former based on phytoplankton and the latter on a mixed pool of seagrass detritus, epiphytes and benthic algae as carbon sources. A particularly important trophic role appears to be performed by the vegetal epiphytic community on seagrass leaves (δ13C = -14.9 ± 0.1‰), which supports most of the faunal seagrass community (i.e. Amphipoda, Isopoda, Tanaidacea; δ13…

3D-Reconstruction of a Giant Posidonia oceanica Beach Wrack (Banquette): Sizing Biomass, Carbon and Nutrient Stocks by Combining Field Data With High…

2022

Beach wracks are temporary accumulations of vegetal detritus that can be found along coastlines all over the world. Although beach wracks are often perceived as a nuisance for beach users, they play a crucial ecological role in carbon and nutrient connectivity across ecosystem boundaries, especially when they reach a relevant size, as in the case of the wedge-shaped seagrass accumulations called banquette. In this study, three-dimensional mapping of a giant Posidonia oceanica banquette was carried out for the first time using high-resolution UAV photogrammetry combined with field sampling and compositional and chemical analysis. The combined approach allowed a reliable estimation of the amo…

Sedimentary and particulate organic matter: mixed sources for cockleCerastoderma glaucumin a shallow pond, Western Mediterranean

2007

Seasonal changes in feeding habits and diet of the cockle Cerastoderma glaucum (Mollusca, Bivalvia) were analysed using carbon (δ 13 C) and nitrogen (δ 15 N) stable isotopes. I aimed to investigate the role of benthic and pelagic sources in the diet of this dominant infaunal bivalve on a western Mediterranean sandy bottomed pond. Adult C. glaucum and all potential organic sources (particulate and sedimentary organic matter, seagrass, macroalgae, het- erotrophic detritus) were collected and analysed for δ 13 Ca ndδ 15 N. In total 5 dominant organic sources were found, ranging between -21.0 and -8.0%� for δ 13 C and from 3.0 to about 7.0%� for δ 15 N. C. glaucum assimilated fraction ranged be…

Caulerpa racemosa var. cylindracea as a potential source of organic matter for benthic consumers: evidences from a stable isotope analysis.

2008

Caulerpa racemosa var. cylindracea has been invading various types of substrates in wide areas throughout the Mediterranean Sea. However, the effects of the distribution of this alga on zoobenthos are scanty. The aim of this study was to evaluate the effects of C. racemosa invasion on the feeding habits of some zoobenthic taxa inhabiting the upper infralittoral rocky shores. This was done by identifying the isotopic N and C ratios of several potential food sources and testing differences in isotope composition among the taxa collected from areas invaded and not-invaded areas by C. racemosa. Results suggest that C. racemosa detritus was a significant food source for the polychaete Syllis pro…

Seagrass litter decomposition in a semi-enclosed coastal ecosystem: a litterbag experiment

2009

Slow/Fast. Piccoli oggetti al di là dell'interno

2020

Contemporary behavioural scenarios change quickly, linked to habits aimed at continuous displacements, with variable panoramas and places of reference. Human activities, traditionally related with the domestic interior, are located outside. New paces and frenetic ways of life reduce to a minimum the time dedicated to primary needs, primarily the need for eating. Lunch breaks are quick and optimised, the rituals of "eating together around the table" have changed profoundly, often relegated to a few small occasions. The result is an essential relapse into the world of objects, ready to condense the ritual of solitary consumption of the meal, in a simple and immediate, rapid gesture. At the sa…

Il c.d. arbitrato irrituale previsto dall'art. 803-ter c.p.c.

2009

Uomini e alberi. Tre indagini storico-religiose. Nota introduttiva

2021

In this introductory note I present three essays on the relationship between trees and rituals in ancient Mediterranean civilisations and in Vedic India.

Aspetti della storiografia moderna su ethne e religioni nella Sicilia antica

2013

Obiettivo del testo è tentare di indicare alcuni aspetti del dibattito storiografico moderno sul rapporto tra etnicità e culti nella Sicilia antica, partendo dal presupposto, credo ampiamente condiviso, che ogni ricostruzione storica del passato è anche un terreno di scontro sul presente dello storico. Vi è insomma un rapporto fondamentale tra presente e passato, rapporto che si inscrive dialetticamente nella tensione comprendere il presente mediante il passato e comprendere il passato mediante il presente. In questa prospettiva orientare la questione delle origini in una direzione piuttosto che in un’altra diventa funzionale a opzioni ideologiche e a strategie di legittimazione politica, c…