Search results for "benthos"
showing 10 items of 126 documents
Algal assemblages response to fish-farm biodeposition in a Southern Mediterranean area (Gulf of Castellammare, Sicily): preliminary data
2005
This study, carried out in the Gulf of Castellammare (northern coast of Sicily), concerns the effects of fish-farm nutrient enrichment on the algal assemblage growing on artificial substrata of cages. A total of 51 taxa were identified (3 Cyanophyceae, 3 Phaeophyceae, 5 Bacillariophyceae, 3 Chlorophyceae, 6 Ulvophyceae and 31 Rhodophyceae). A dominance of opportunistic species was highlighted, following a gradient from impact areas to controls.
Ruolo dell’interazione tra impatto antropico e inclinazione del substrato nella struttura delle comunità bentoniche di fouling
2006
I substrati duri artificiali sono idonei per verificare la risposta ecologica degli organismi del benthos a differenti livelli di variabilità dell’interazione tra fattori antropici, abiotici e biotici. La combinazione tra impatto umano e inclinazione del substrato può influenzare la struttura di comunità. Lo studio è stato condotto nella primavera 2006 nel Golfo di Palermo, nel quale sono state individuate due località a diverso grado di impatto antropico derivante da attività industriali e da reflui urbani. In ogni località, sono stati scelti siti a differente complessità geometrica (inclinazione orizzontale vs verticale). I campionamenti sono stati effettuati sulla fascia mesolitorale di …
Impatto di Caulerpa Taxifolia var. Distichophylla su macro- e meiofauna associate a Posidonia oceanica
2015
Macro- and meiofauna associated with Posidonia oceanica meadows colonized by the invasive alga Caulerpa taxifolia var. distichophylla (Caulerpales) in southern Sicily were analyzed and compared with assemblages of control meadows from the same area. Independently from the degree of invasion (severe or partial), the affected macrofaunal assemblages significantly differed from the controls with the former ones characterized by an increase of molluscs and polychaetes and the decrease of crustaceans. Meiofaunal assemblages showed contrasting results being affected by severe algal invasion but not significantly differing from control assemblages under partial invasion conditions, suggesting some…
The effect of seagrass loss on macrozoobenthos community in a Mediterranean semi-enclosed coastal system
2009
Posidonia oceanica loss in a Mediterranean semi-enclosed coastal system: response of polychaete assemblage
2012
Studio delle tanatocenosi a foraminiferi bentonici nel Golfo di Gela
2009
Sustainable Exploitation and Conservation of the Endemic Lake Baikal Sponge (Lubomirskia baicalensis) for Application in Nanobiotechnology
2009
The large sub-continent of Siberia is one of the richest mineral and oil resources on Earth. In its center, one region has gained prominence: Lake Baikal. It is one of the oldest, the deepest, and the lake with the greatest volume on Earth and is inhabited by more than 1,500 endemic species. It was Pallas (1771) who discovered in the lake a sponge species, Lubomirskia baicalensis (Porifera: Demospongiae), which dominates Lake Baikal's littoral-zone benthos. This sponge species has a distinguished, pronounced body plan which is composed of modules. The application of molecular biological and cell biological techniques has allowed an insight into the richness of the genomic regulatory systems…
Role of terrestrial carbon in aquatic UV exposure and photoprotective pigmentation of meiofauna in subarctic lakes
2015
Summary Aquatic organisms are adversely influenced by ultraviolet radiation (UV) and utilise photoprotective strategies, including pigmentation. We examined UV-protective melanin pigmentation of aquatic meiofauna (Cladocera) in relation to the UV exposure across 25 tree line lakes in Finland to address the potential effects of increased UV and altered input of UV-screening terrestrial dissolved organic carbon (DOC) on aquatic organisms. Bio-optical parameters, including concentration of DOC, the coloured dissolved organic matter (CDOM) fraction, a suite of carbon quality indices and chlorophyll a, were analysed from lake water, and their role in controlling underwater UV environment (measur…
Influence of artificial reefs on the surrounding infauna: Analysis of meiofauna
2002
We adopted a bottom-up approach in studying the effect of two artificial reefs in contrasting environmental conditions (sandy-mud and meso-eutrophic in the Adriatic Sea versus coarse sands and oligotrophic in the Tyrrhenian Sea) on the surrounding environment by assessing changes in the meiofauna. The spatial distribution of meiofaunal assemblages was established along a transect running from within each reef to well outside its direct sphere of influence, along with information on the trophic conditions of sediments (chloropigments, proteins, carbohydrates and total organic matter). Although total densities were significantly higher in the Adriatic than in the Tyrrhenian, the meiofauna dis…
Distribution and sources of bulk organic matter (OM) on a tropical intertidal mud bank in French Guiana from elemental and isotopic proxies
2014
International audience; The mobile French Guiana coast is a shoreface region downdrift of the Amazon River, where enormous quantities of inorganic and organic materials are exchanged with the Atlantic Ocean. The rapid accumulation of these materials forms highly unstable shore-attached mud banks, which can be temporally emerged and then rapidly colonized and stabilized by microphytobenthos and opportunistic mangroves (i.e. Avicennia germinans). Mud banks are preferential sites for the accumulation and significant remineralization of organic matter (OM) due to intense erosion/deposition cycles and potential biological colonization. The distribution and sources of bulk sedimentary OM were cha…