1,721,021 research outputs found
Aspetti della biologia di Lepidorhombus boscii (Risso, 1810) (Osteichthyes, Scophthalmidae) nel Mar Ionio
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Catture ricorrenti di Epinephelus aeneus (Geoffroy St.-Hilaire, 1809) nel Mar Ionio: un ulteriore elemento per individuare una possibile ZTB?
No full textSize evaluation of Delectopecten vitreus (Mollusca, Bivalvia) from Santa Maria di Leuca deep-water coral site (Ionian Sea).
No full textThe size of a Mediterranean population of the deep sea pectinid Delectopecten vitreus (Mollusca, Bivalvia) is discussed with respect to Atlantic counterparts. The Mediterranean specimens collected in the Ionian Sea at the Santa Maria di Leuca deep water coral site are characterized by a size smaller than Atlantic stocks
Accrescimento, longevità ed effetti della senescenza in Aristeus antennatus nel Mar Ionio
No full textDistribution and life strategy of the deep-sea crab Paromola cuvieri (Risso, 1816) (Brachyura, Homolidae) in the central Mediterranean Sea over twenty-five years over twenty-five years
No full textThe present study represents a new contribution to the knowledge on the distribution and life strategy of P. cuvieri in the central Mediterranean. During 71 experimental bottom trawl surveys carried out in the Northern Ionian Sea from October 1994 to July 2019 a total of 457 specimens was sampled from 91 to 1118 m in depth. The highest frequency of occurrence and density was observed in the 600–800 m depth range. The relationship between carapace length and depth was statistically significant showing a significant decrease in size with depth. The length-frequency distribution was unimodal for both sexes and there was a low number of small individuals. The most represented size classes for both sexes were between 50 and 130 mm Carapace Length (CL), with males significantly larger than females. The sex ratio by size showed an increase of males with increasing length. Of the sampled females, 50 were in ovigerous condition and 92 females were non ovigerous. P. cuvieri appears to have continuous reproduction throughout the year, with ovigerous females observed in all seasons, with the highest abundance in spring and winter and between 400 and 800 m of depth. The fecundity ranged between 138165 and 374453 eggs with a mean value of 217237 eggs. The eggs show a spherical shape and their mean size increased with maturity stage. Egg development appears to not be completely synchronous, and two patterns can be observed simultaneously. The relationships between CL/brood size and weight/brood size were highly sig- nificant. The relationships between width and hand-length of both chelae and Carapace Width (CW) for both sexes were highly significant. Time-series data showed a scanty abundance of P. cuvieri in the studied area with no trend over the period 1995–2019 with no significant trend over. Its preferential distribution on the middle slope was confirmed. Time-series data (1995-2019) showed a scanty abundance of P. cuvieri in the studied area with no signficant trend. Its preferential distribution on the middle slope was confirmed
Osservazioni sulla riproduzione di Aristeus antennatus e Aristaeomorpha foliacea (Crustacea, Decapoda) nel compartimento marittimo di Gallipoli (Mar Ionio)
No full textFeeding behaviour of deep-water scavengers in the central Mediterranean: in situ observations using a baited lander
No full textUsing a baited lander in Vulnerable Marine Ecosystems (VMEs) along Apulian coast between 476 and 792 m in depth, information on feeding behaviour of scavenger specie were recorded. Lander MEMO was deployed in 3 VMEs characterized by the presence of CWC species and habitat: Bari Canyon (BC) province, off Monopoli (Mn) and Santa Maria di Leuca (SML) province. A total of 28 species were recorded and 11 of them showed feeding behaviour on bait. In BC the highest mean scavenging rate of 10219 g/day was recorded and in all areas Conger conger was the most active scavenger on the bait
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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