134 research outputs found
Citizen education by involvement in marine biodiversity monitoring.
No full textCITIZEN EDUCATION BY INVOLVEMENT IN MARINE BIODIVERSITY MONITORING
S. Goffredo, P. Neri, A. Orlandi, F. Pensa, M. Scola Gagliardi, A. Velardi, C. Piccinetti, F.
Zaccant
Preliminary biological data on the northeast Mediterranean conger eel Conger conger L., 1758
No full textLos ejemplares de congrio Conger conger L., 1758 provenientes de las campañas de primavera Medits (Mediterranean International Trawl Survey, primavera de 2002) y de otoño Grund (National Group for Demersal Resource Evaluation, otoño de 2001 y 2002) en el mar Adriático (Mediterráneo nororiental), entre 0 y 400 m de profundidad, tienen una longitud que oscila entre 21 y 130 cm y, con mayor frecuencia, entre 30 y 50 cm. La edad, determinada mediante la cuenta de los anillos y la medición del eje mayor de los estatolitos, se estima entre 3 y 8 años, con predominio de ejemplares de 4 y 5 años. El análisis histológico de las gónadas ha permitido identificar solo óvulos inmaduros. La dieta, más abundante en otoño, se constituye principalmente a base de Osteichthyes, Crustacea y Mollusca.Specimens of conger eel Conger conger L., 1758 from spring Medits (Mediterranean International Trawl Survey, spring 2002) and autumn Grund (National Group for Demersal Resource Evaluation, autumn 2001 and 2002) trawl surveys in the Adriatic (northeast Mediterranean) at depths of between 0 and 400 m, were found to measure in length from 21 to 130 cm, with greater frequency in the 30 to 50 cm range. Age determined on the basis of ring count and the length of the greater otolith axis was found to be between 3 and 8 years, with the majority of specimens in the 4- to 5-year range. Histological gonad analysis only revealed immature ovaries. The specimens were found to feed chiefly on Osteichthyes, Crustacea and Mollusca, which are most abundant in autumn.Instituto Español de Oceanografí
AGE, GROWTH, AND GONAD ORGANIZATION IN RED BANDFISH (CEPOLA MACROPHTHALMA L., 1758) FROM THE ADRIATIC SEA.
No full textThe red bandfish Cepola macrophthalma (L.) is characterized by a gonochoristic sexual organization. Age was estimated from otolith readings. Males were found to reach a greater length than females. During the reproductive period the males prevail in comparison to the females
Feeding habits of Trisopterus minutus capelanus (Lacepede, 1800) (Osteichthyes, Gadidae) in the North Adriatic Sea
No full textThe paper examines the diet's composition of Trisopterus minutus capelanus A total of. 303 specimens have been captured in the north Adriatic sea all year long. This is a nekto-benthic species and it prefers Crustacea and Teleostea. There are some less important diet constituent like Polichaeta, Bivalvia and Cephalopoda. Crustacea are prevalent always, but decrease in winter and reproductive period, conversely to Teleostea
Observations on the growth of whiting, Merlangius merlangus L., in the North Adriatic Sea.
No full textThe growth of whiting, Merlangius merlangus (Osteichthyes, Gadidae), has been studied in the northern Adriatic Sea by otolith biometrics (length and weight) and reading evaluations. Females show a faster growth than males
Il potenziamento dell’attività di pompa venosa del tricipite surale in ortopedia e traumatologia mediante l’utilizzo di una nuova apparecchiatura di ginnastica vascolare.
No full textEUROPEAN HAKE DIET IN THE ADRIATIC SEA: A METABARCODING APPROACH
No full textEuropean hake (Merluccius merluccius), is a demersal fish distributed from the North Sea and Atlantic to the Levantine Sea in the Mediterranean. It is an important predator of deep Mediterranean upper shelf slope communities currently characterised by growth overexploitation. M. merluccius adults feed mainly on fish and squids whereas the juveniles (<16 cm) feed on crustaceans. All current European hake diet studies relied on the morphological identification of prey remains in stomach content, however this method is labour intensive and it precludes the identification of strongly digested food. In this study we applied High-Throughput Sequencing (HTS) approaches that allow the simultaneous detection of many consumed species (DNA metabarcoding). Our approach is based on COI (cytochrome oxydase I) PCR amplification of stomach content remains and sequencing by using the Miseq Illumina paired-end technology. We sequenced 95 stomach remains of M. merluccius (representing all the size classes) and one pooled DNA sample of European hake preys used to assess the efficiency of the technique. Classic microscopic morphological analyses on stomach content remains have been carried out contextually to compare the results of the two methods. The molecular approach clearly outperformed the morphological prey analysis both in sensitivity and specificity. Statistical analysis of diet composition revealed a lack of differentiation among the size classes, suggesting an opportunistic feeding behaviour also supported by the homogenous bathymetry and, therefore, relatively homogeneous biocenosis of the sampling sites. Moreover the results of the artificially pooled sample allowed to confirm the semi-quantitative nature of this analysis
Reproductive cycle of the common sole Sole vulgaris Quensel, 1806, in the northern Adriatic Sea
No full textAnatomical and cytotogical modifications of the ovary of Solea vulgaris Quensel from the northern Adriatic Sea were studied over a one-year period. Seven stages of ovarian development were observed. The gonadosomatic index increased rapidly during the reproductive season from December to March, when the majority of oocyte growth (>20010-6m in diameter) occurred. Hydrated oocytes immediately before spawning reach 136010-6m. During spring, summer and autumn (from April to November) previtellogenic oocytes (<20010-6m) occurred
ETÀ, ACCRESCIMENTO, MATURITÀ SESSUALE ED ECOLOGIA TROFICA DI TRE SPECIE ITTICHE ‘BERSAGLIO’ (SCORPAENIFORMES: TRIGLIDAE) DEL MARE ADRIATICO
No full textLo studio dei triglidi assume particolare importanza nella gestione delle
risorse demersali perché poco noti, come evidenziato dal protocollo
d’intesa tra Commissione europea e ICES. Scopo del lavoro è la valutazione della bio-ecologia delle popolazioni adriatiche, al fine di analizzarne i rapporti intra ed interspecifici in relazione alla rete trofica.
530 esemplari di Aspitrigla cuculus, 1444 di Chelidonichthys lucerna, 679 di Eutrigla gurnardus sono stati campionati stagionalmente mediante campagne oceanografiche tra il 2005-2009 registrandone i parametri biometrici standardizzati e lo stadio di maturità sessuale. Sono stati utilizzati subcampioni di stomaci per comparazioni trofiche e di otoliti per determinare l’età. Il passaggio giovanile-adulto avviene intorno al primo anno di età, la maturità sessuale al secondo con differenze di taglia correlate a sesso e specie. Prede preferite sono i crostacei con differenze relative a taglia e specie. Gli adulti pur evidenziando uno spettro trofico maggiore rispetto ai giovanili mostrano specializzazioni individuali.I triglidi analizzati raggiungono una ‘taglia critica’ alla fine del primo anno in concomitanza con:passaggio stadio giovanile - stadio adulto, inizio dicotomia tra sessi, allontanamento dalla costa, colonizzazione di nicchie trofiche differenti. Si segnala l’importanza della relazione tagliaprofondità
e l’ampiezza di nicchia dei triglidi nella distribuzione delle risorse trofiche
Accrescimento del merlano, MERLANGIUS MERLANGUS (Linneo, 1758), nel nord Adriatico.
No full textE' stato studiato l'accrescimento del merlano, Merlangius merlangus (Osteichthyes, Gadidae) nel Nord Adriatico mediante biometria degli otoliti (lunghezza e peso) e lettura degli annuli. Le femmine crescono più velocemente dei maschi
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