1,721,083 research outputs found
Primi ritrovamenti di Rapana venosa (Valenciennes, 1846) per alcune lagune costiere italiane.
No full textFirst record of Paguristes streaensis Pastore, 1984 (Decapoda, Anomura, Diogenidae) from the Gulf of Naples (Tyrrhenian Sea).
No full textObservations of the catches carried out in the Gulf of Naples have led to the finding of a specimen of Paguristes streaensis Pastore, 1984. The place of collection is the Nisida Shoal (14'9'N - 40°47'E), Gulf of Pozzuoli (Naples), at a depth between 35 and 45 m; the collection was done in Apri1 2004. The hermit crab occupied a gastropod shell of the species Cerithium vulgatum Bruguière, 1792. This record extends its established distribution to the Tyrrhenian Sea
I Molluschi marini di Punta di Pioppeto (Isola di Procida - Campania).
No full textL’eterogeneità degli ambienti marini dell’area situata tra Punta di Pioppeto ed il molo di Sancio Cattolico (versante nord dell’Isola di Procida, NA) determina un’elevata diversità della malacofauna. Il presente lavoro fornisce una check-list aggiornata basata su materiale raccolto in un ampio arco di tempo, dal 1976 al 2005. Nel complesso sono state rinvenute 419 specie, appartenenti alle classi Polyplacophora (6 specie), Gastropoda (299 specie), Scaphopoda (3 specie), Bivalvia (105 specie) e Cephalopoda (6 specie). I molluschi sono stati prelevati utilizzando varie tecniche di campionamento (prelievi a mano, prelievi di detrito ed alghe, raschiamento su massi, retinate su Posidonia oceanica), a profondità comprese tra 0 e 5 metri. Per ogni specie segnalata viene data un’indicazione di frequenza e, nel caso di specie più rare od interessanti, vengono anche indicate le modalità di ritrovamento e biocenosi in cui sono state rinvenute. Le seguenti specie sono da considerarsi nuove per il Golfo di Napoli: Odostomia nitens Jeffreys, 1870, Peringiella elegans (Locard, 1892), Mathilda gemmulata Semper, 1865 e Lepton squamosum (Montagu, 1803)
Maja goltziana d'Oliveira, 1888 (Decapoda, Brachyura, Majidae) in the southern Tyrrhenian Sea.
No full textMaja goltziana d’Oliveira, 1888 is an oxyrhynch crab occurring in the eastern Atlantic Ocean from Portugal to Congo and the Canary Islands, and in the Mediterranean Sea (d’Udekem d’Acoz, 1999). It is apparently uncommon all across its distributional range, although González Pérez (1995) describes it as a frequent species on the Canary Islands. In the Mediterranean, it is by far the least common of the Maja species, among which it can easily be distinguished by the morphological characteristics of the dorsal part of the carapace and of the walking legs.
The present paper reports about two findings of M. goltziana in the southern Tyrrhenian, and confirms its established presence in the western Mediterranean Sea
Cohabiting with litter: Fish and benthic assemblages in coastal habitats of a heavily urbanized area
No full textAnthropogenic litter negatively impacts the marine environment and threatens biodiversity. At the same time, it represents a suitable substrate for the settlement of sessile species, thus potentially altering composition and structure of soft bottom benthic assemblages. By using a Remotely Operated Vehicle (ROV), we hereby investigated patterns of abundance, distribution, and origin of benthic litter in three subtidal habitats of a heavily urbanized area and tested whether litter distribution related to patterns of fish and mega- and macro-benthic diversity. Litter accumulation mostly occurred on soft bottoms, while rocky substrata were the least affected, albeit being particularly threatened by sea-based pollution. As expected, the highest biodiversity was observed on rocky bottoms, hosting notable biogenic formations (Cladocora caespitosa, Leptogorgia sarmentosa) despite the area is historically affected by anthropogenic activities. No correlation was found between biota and marine litter, suggesting that litter does not apparently influence biodiversity and distribution of the investigated assemblages
Prime segnalazioni di Nodilittorina punctata (Gmelin, 1791) per il Golfo di Salerno, il Golfo di Napoli ed i litorali laziali (Tirreno centro-meridionale).
No full textAn Overview of the Data Envelopment Analysis and Stochastic Frontier Analysis
No full textThis work wants to compare the assumptions that form the basis of the two metods (SFA and DEA) in order to provide points of reflection to those who want to measure efficiency
New parasite records for the sunfish Mola mola in the Mediterranean Sea and their potential use as biological tags for long-distance host migration
Full text linkStudies describing the parasite fauna of sunfish species from the Mediterranean Sea are to date limited, despite information gained through parasitological examination may reveal unknown ecological and biological aspects of both hosts and parasites. Moreover, recent molecular studies on sunfish taxonomy revealed the presence of two species belonging to the genus Mola in the Mediterranean basin, namely M. mola and M. alexandrini. These two fish taxa have long been synonymized or confused among them, which implies that the majority of the studies carried out so far reported the parasites infecting both species under a single host species, generally referred to as M. mola. We hereby investigated the parasite fauna of a 43 cm long M. mola specimen from the Mediterranean Sea, whose identification was confirmed by molecular tool, and provided the first evidence of the occurrence of the nematode Anisakis simplex (s.s.) and of the cestode Gymnorhynchus isuri in Mola species anywhere. The use of helminth species as biological tags for the sunfish is also discussed
Un esemplare teratologico di Rissoa variabilis (Von Muehlfeldt, 1824) (Mollusca, Gastropoda, Rissoidae) con doppio peristoma.
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