Search results for "Cystoseira"

Seasonal variation in total phenolic content of Dictyopteris polypodioides (Dictyotaceae) and Cystoseira amentacea (Sargassaceae) from the Sicilian c…

2014

This study focuses on the differences in total phenolic content and its seasonal variations in two temperate brown algae, Cystoseira amentacea (C. Agardh) Bory and Dictyopteris polypodioides (A.P. De Candolle) J.V. Lamouroux, inhabiting respectively the infralittoral fringe and the upper infralittoral zone. Phenolic compounds are secondary metabolites, found in almost all brown algal orders, that function as defense against grazers, epiphytes and UV radiation. Total phenolic content was determined colorimetrically with the Folin-Ciocalteu reagent. Results showed significant differences in total phenol content between D. polypodioides and C. amentacea with higher values observed in the first…

ANTIPROLIFERATIVE ACTIVITY OF CYSTOSEIRA FOENICULACEA SFE EXTRACT ON HEPG2 CELL LINE.

2008

Role of two co-occurring Mediterranean sea urchins in the formation of barren from Cystoseira canopy

2015

Abstract In the Mediterranean Sea the co-occurring sea urchins Paracentrotus lividus and Arbacia lixula are usually considered to share the same ecological role in the formation of barren from Cystoseira canopy. However, their foraging ability may vary due to feeding behavior and species-specific morphological traits. The relative effects of P. lividus and A. lixula on Cystoseira canopy was tested experimentally both in the laboratory, at a density of about 20 ind./m 2 , and in the field by gut content analysis. Field and laboratory results show that A. lixula is unable to affect Cystoseira spp. Furthermore, these results confirmed the great ability of P. lividus to consume Cystoseira canop…

Status of vulnerable Cystoseira populations along the Italian infralittoral fringe, and relationships with environmental and anthropogenic variables

2018

We analyzed the occurrence and status of infralittoral fringe populations of Cystoseira spp. (Fucales) at thirteen rocky sites around the Italian coastline, and explored the relationships with relevant environmental and anthropogenic variables. We found Cystoseira populations at 11 sites: most were scattered and comprised monospecific stands of C. compressa, and only 6 sites also supported sparse specimens of either C. amentacea var. stricta or C. brachycarpa. Coastal human population density, Chlorophyll a seawater concentrations, sea surface temperature, annual range of sea surface temperature and wave fetch explained most of the variation of the status of C. compressa. We hypothesize a g…

Study of the community of Cystoseira brachycarpa J. Agardh emend. Giaccone of a shallow hydrothermal vent area of the Aeolian Islands (Tyrrhenian sea…

2011

Efficacia delle AMP nella conservazione della biodiversità: i popolamenti a Cystoseira nell’AMP “Capo Gallo-Isola delle Femmine” (Pa)

2008

Scopo dello studio è quello di i) valutare lo stato di salute e di conservazione delle comunità a Cystoseira presenti nell’A.M.P. “Capo Gallo-Isola delle Femmine” ii) confrontarlo con i dati storici, iii) confrontarlo con quello di siti di controllo al di fuori dell’A.M.P. e quindi iv) verificare il successo/efficacia dell’A.M.P nel proteggere e mantenere queste comunità e quindi la biodiversità di questi ecosistemi dalla sempre più intensa pressione antropica. Lo studio viene condotto, in particolare, sui popolamenti a Cystoseira dell’infralitorale di siti chiave all’interno della Riserva (Zone A, B e C) e di due siti di controllo: Punta Priola (PA) e Monte Cofano (TP). Lo stato di conserv…

Analisi del DNA genomico nucleare di popolamenti a Cystoseira spp. nell’Area Marina Protetta di Capo Gallo-Isola delle Femmine (Sicilia nord-occident…

2008

In this preliminary study we report the first observations on nuclear DNA analysis of Cystoseira populations at Capo Gallo - Isola delle Femmine MPA (north-western Sicily). Some specific bands resulted from the DNA extraction of 2 species even though aspecific bands, probably due to polysaccarides and microendophytes were also highlighted.

Effect of algal architecture on associated fauna: some evidence from phytal molluscs

2002

In the southern Mediterranean Sea, replicate samples of six common upper-infralittoral algae (Cystoseira barbatula, Cystoseira spinosa, Sargassum vulgare, Halopteris scoparia, Dictyota fasciola, and Dictyota dichotoma) were collected with the major goal of investigating the composition and structure of molluscan assemblages between the algal species. In order to measure the habitat architecture of the six algal species and relate this to the molluscan assemblages, several structural attributes were calculated on each individual plant. There were differences in architectural attributes between the six algal species, with data recorded for S. vulgare and H. scoparia more similar to data for C…

Molluscan assemblages associated with photophilic algae in the Marine Reserve of Ustica Island (Lower Tyrrhenian Sea, Italy)

2000

Abstract Very few studies have addressed the effect of protection on macrozoobenthos in marine protected areas, and particularly for sites in the Mediterranean Sea. In the present study, the molluscan assemblages associated with photophilic algal communities of the Marine Reserve of Ustica Island, were investigated. A survey was carried out along transects from 1 to 15 m in depth, during the spring of 1996 at three different sites, subjected to different levels of reserve protection. Species richness and number of individuals reflected the level of protection, and both variables were significantly higher in the integral (most heavily protected) part of the reserve compared with the less wel…

Bi- and three-dimensional fractal analysis of the brown seaweed Gongolaria montagnei and their relationship with gastropod molluscs assemblage

2022

Habitat complexity is one of the main influences on biodiversity in marine environments, particularly in coastal areas where foundation seaweeds provide substrate for highly diverse communities. We studied the 2D and 3D fractal dimensions of Gongolaria montagnei (Fucales) over the vegetative season and examine their relationship with the abundance, species richness and morpho-functional groups of the gastropod associated. Overall, the 3D fractal analysis method used here better describes seaweeds structural complexity compared to the traditional 2D fractal analysis, as highlighted by the higher relationship with gastropod assemblage associated to the alga in terms of abundance, number of sp…