ECONOMIC EFFECTS OF FISHERIES EXCLUSION ZONES: A SICILIAN CASE STUDY

Spatial approaches to fisheries management in the form of total or partial exclusion zones have attracted much interest in recent years, though relatively little is known in practice about how such measures impact fishermen or other groups of stakeholders. The present paper hopes to shed light on this issue by reporting the results of a recently completed EU project investigating the effects of a trawl ban introduced in the Gulf of Castellammare, NW Sicily, in 1990. The results indicate that the prohibition on trawling led to stock recovery and improved financial returns for the artisanal fishermen who have been permitted to operate within the restricted area. There is evidence, however, that the displacement of trawlers to the outer periphery of the exclusion zone has impacted adversely on artisanal operators located immediately outside the trawl ban area.Resource /Energy Economics and Policy,

Prvi nalaz plavog raka Callinectes sapidus (Crustacea, Decapoda, Portunidae) u središnjem i južnom Tirenskom moru

Four individuals of the non-indigenous blue crab, Callinectes sapidus Rathbun, 1896 (Crustacea, Decapoda, Portunidae) were collected during commercial trammel net operations in fall 2019 and winter 2020 along the coast of NW Sicily. The crabs were collected in very shallow waters on a sandy bottom close to the coast. Although blue crabs are now widespread along most eastern, western and northern Mediterranean coasts, this is the first record of this species from the central and southern Tyrrhenian Sea.Četiri jedinke authtonog plavog raka, Callinectes sapidus Rathbun, 1896, (Crustacea, Decapoda, Portunidae) prikupljena su tijekom komercijalnog ulova u jesen 2019. i zimu 2020. uz obalu sjevernozapadne Sicilije. Jedinke su sakupljane u vrlo plitkim vodama, na pješčanom dnu, te u blizini obale. Iako su plavi rakovi danas rašireni duž većine istočne, zapadne i sjeverne obale Sredozemlja, ovo je prvi nalaz ove vrste iz središnjeg i južnog Tirenskog mora

Aspetti dell'alimentazione di alcune specie ittiche batiali del Canale di Sicilia: Aristaeomorpha foliacea, Nezumia sclerorhynchus, Coelorhynchus coelorhynchus e Hymenocephalus italicus

Il gruppo dei Crostacei Decapodi comprende specie molto eterogenee per quanto riguarda la posizione occupata nei livelli trofici: vi sono rappresentate infatti specie necrofaghe, detritivore, nonchè attive predatrici, cosicchè ci sembra di grande interesse indagare il ruolo svolto da una specie di ingente valore commerciale - l'Aristaeomorpha foliacea - nell'ambito delle reti trofiche batiali. Esistono alcuni studi analoghi, riguardanti però Aristeus antennatus, effettuati in diverse aree mediterranee (acque spagnole, Mar Ligure); si è pensato dunque di condurre, parallelamente ad una ricerca sull'alimentazione di alcuni Selaci che è stata avviata a partire dal IX TRAWL survey (ved. ID/W.PR/CP-GB-MG-GD-FB/1/0690/DRAFT), lo studio dei contenuti stomacali di A. foliacea catturata durante le campagne di pesca organizzate dall'ITPP, a partire dal X survey. Per conoscere meglio anche i rapporti preda - predatore e/o di competizione tra questa specie ed altre presenti nello stesso ambiente, oltre ad usufruire delle informazioni provenienti dal parallelo programma sui Selaci, si è pensato di studiare la dieta di tre Teleostei Macruridi comunemente presenti sugli stessi fondi di pesca degli Aristeidi: Nezumia sclerorhynchus, Coelorhynchus coelorhynchus e Hymenocephalus italicus

Movement ecology of the white seabream Diplodus sargus across its life cycle: a review

The white seabream Diplodus sargus (L., 1758) (Osteichthyes, Sparidae) is a littoral species living mainly in rocky habitats and distributed in the eastern Atlantic and the Mediterranean. This species is targeted by artisanal and recreational fisheries and presents a high commercial importance. Although classified by IUCN as a "least concern" species, it has been the object of marine ranching and restocking initiatives to counteract locally intense exploitation. Here, we review the current knowledge on the movement ecology of white seabream given the relevance of animal movement in ecological and behavioral studies and their potential application in management and conservation. The literature on this topic was analyzed in order to summarize the results of past research and to identify the gaps that still exist on the matter. We reviewed a total of 27 papers focusing on the movement ecology of white seabream, where acoustic telemetry (n = 12), underwater visual observation and traditional tagging (n = 6), genetic analysis (n = 6), and otolith microchemistry (n = 3) were used. While the first three methods were applied to juvenile and adult fish, the last one was also used with larvae, which have been the object of experimental trials to ascertain their swimming abilities. The largest amount of information on activity rhythms (diurnal with a few exceptions), movement patterns (short distances), homing (ability to come back to the capture site), site fidelity (high), and home range (< 200 ha on average and highly related with seabed morphology) were obtained through acoustic telemetry, whose main limitation is the minimum body size required for its application. The environmental variables found to affect movement patterns in this species are water temperature (which triggers spawning-based vertical movements), local sea conditions (which affect short-scale movements in juveniles), and the main seabed features (orientation and habitat type). The main gaps identified, which need more extensive research and some technological improvements, include the study of the effects of environmental variables on fish movements and further investigations on the movement patterns of juveniles.info:eu-repo/semantics/publishedVersio

Assessing Tolerance to the Hydrodynamic Exposure of Posidonia oceanica Seedlings Anchored to Rocky Substrates

Among a suite of abiotic and biotic factors, the hydrodynamic regime strongly influences the success of seagrass recruitment through sexual propagules. Uprooting of propagules by drag forces exerted by currents and waves is one of the main causes for the failed establishment and the consequent recruitment. Substrate type and stability play a key role in determining the success of colonization through sexual propagules, as seedling establishment probabilities proved to be significantly higher on rocky bottoms than on unstable unconsolidated substrates. In this research, the current and wave flow intensity that Posidonia oceanica seedlings anchored to rocky substrates can withstand before uprooting were evaluated and the influence of substrate complexity on seedling anchorage success and anchorage strength was investigated. P. oceanica seedlings withstood the current velocity of 70 cm s–1 and increased orbital flow velocities up to 25 cm s–1. Seedling adhesion strength ranged from 3.92 to 29.42 N. Results of the present study corroborate the hypothesis that substrate complexity at scales relevant to the size of propagules is a crucial feature for P. oceanica seedling establishment. The intensity of unidirectional and oscillatory flow that seedlings can withstand without being dislodged assessed in this study support the hypothesis that P. oceanica sexual propagules, once adhered to a consolidated substrate, are able to tolerate high hydrodynamic stress. The results of the present study contribute to re-evaluation of the habitat requirements of P. oceanica, assessing the range of hydrodynamic conditions that this species can tolerate during the early stages of its life history

Root Hair Adhesion in Posidonia oceanica (L.) Delile Seedlings: A Numerical Modelling Approach

Animals and plants use adhesion to move, to anchor to a substrate, or to disperse seeds and fruits. Some plants developed a root pad as a common strategy to adhere to consolidated substrates. In the marine environment, the seagrass Posidonia oceanica attaches fi rmly to consolidated substrates via adhesive root hairs, forming a pad structure. We used novel morphological and ultrastructural data to develop a numerical model to study the dynamics of root hair adhesion during contact formation on rough consolidated substrates for this species. Morphological analysis, conducted using Scanning Electron Microscope, highlighted the role of root hair branching in pad formation. Transmission Electron Microscope microscopy allowed us to identify a glue-like substance at the pad/ substrate interface. The numerical model highlighted the role played by the cell wall ’ s elasticity in pad formation and its importance in guaranteeing a fi rm adhesion. Furthermore, the effectiveness of these mechanisms was assessed at different simulated roughness levels. Increasing knowledge on the adhesion mechanism of seagrass to consolidated substrates could be pivotal in developing advanced seedling-based restoration protocols. The fi ndings of this study could contribute to restoration activities planned to contrast seagrass regression. Transplanting initiatives using seedlings can now better address the search for suitable and low-impact ways to fi x germinated plants to the substrate

New body metrics to determine asteroid size and weight directly in the field

Asteroids are an important group of predators in many marine ecosystems. The measure of body size is crucial in studying asteroid biology as this variable affects both prey selection and predation impact. Current field techniques for estimating asteroid size (i.e. total length TL, total weight TW) include the measure of correlated variables, such us the central disk (CD) and arm length (AL). However, these variables are often time-consuming and require a direct handling of the organism. We tested the accuracy of new asteroid body metrics, the arm height (AH) or arm width (AW), to rapidly estimate body size in asteroids. AH and AW were measured in three of the most common Mediterranean asteroids (Marthasterias glacialis, Ophidiaster ophidianus and Coscinasterias tenuispina), sampled from April to August 2008, along the coasts of Ustica Island off the northern coast of Sicily. We used both linear and exponential regression analyses to compare the performance of AH, AL, AW and CD in estimat- ing size for the three species studied. Results suggest that, in M. glacialis and C. tenuispina, AH is strongly correlated (p<0.001) with both TL and TW, whereas in O. ophidianus it gives a good correlation (p<0.001) with TW only. AW was poorly correlated with both TL and TW in M. glacialis and C. tenuispina, but not in O. ophidianus, where it showed the highest correlation with TW. Thus, only the novel AH measure constitutes a convenient and reliable way of measuring asteroid body size in the field.peer-reviewe

Lenograstim in preventing chemotherapy-induced febrile neutropenia in patients with soft tissue sarcoma

Background: Neutropenia and its complications represent one of the principal dose-limiting toxicity issues in chemotherapeutic regimens for soft tissue sarcoma. Prophylactic granulocyte colony-stimulating factor (G-CSF) reduces the risk of febrile neutropenia (FN). The correct timing of G-CSF administration should be considered in order to optimize the prophylactic treatment. Patients and Methods: Patients (≥18 years old) affected by soft tissue sarcoma and treated with epirubicin and ifosfamide, underwent prophylactic treatment with G-CSF (lenograstim at 263 μg) from day 5 to day 9. The proportion of patients experiencing FN and G4 neutropenia was considered. Results: A total of 36 patients receiving three cycles of chemotherapy with epirubicin plus ifosfamide were treated. None developed FN; G4 neutropenia was reported in 17% of patients. No treatment delay or dose reduction was required, no antibiotic therapy was administered and no hospitalization occurred. Conclusion: Five-day lenograstim treatment is efficient as prophylaxis of FN for soft tissue sarcoma chemotherapy regimens and allows maintenance of chemotherapy dose intensity