1,721,175 research outputs found
Editorial for Special Issue “Meiofauna Biodiversity and Ecology”
Full text linkMeiofauna are a component of aquatic environments from polar to tropical regions.
They may colonize all types of habitats and include very enigmatic and exclusive taxa. The biodiversity
of this component in marine ecosystems is far from being accurately estimated, but this would be
a new challenge given the importance that meiofaunal components may play in marine ecosystem
functioning and processes. This Special Issue collects many interesting topics in research on meiofauna
contributing to plugging a gap on several key issues in their biodiversity, distribution, and ecology,
from numerous regions that include the USA, Brazil, French Guiana, Costa Rica, Mexico, Cuba, Italy,
Kuwait, Vietnam, Madagascar, the Maldives, and South Korea
Applicazione delle Tecniche Affidabilistiche alla Durability Analysis in Campo Aeronautico
No full textContribution to the knowledge of meiobenthic Copepoda (Crustacea) from the Sardinian coast, Italy
No full textContribution to the knowledge of meiobenthic Copepoda (Crustacea) from the Sardinian
coast, Italy. Data available on the Italian species of Copepoda Canuelloida Khodami, Vaun
MacArthur, Blanco–Bercial and Martínez Arbizu, 2017 and Harpacticoida Sars, 1903 report
overall 210 species, but their diversity and biogeography are still poorly investigated. We
carried out a faunistic survey along the eastern coast of Sardinia (Ogliastra region) in order
to document these taxa in the area. A total of 41 species in 36 genera and 18 families
were found. Although many species were identified as putative, the current Italian checklist
was updated with 12 new records of genera and 4 of species. Longipedia coronata Claus,
1862 (Canuelloida), Diosaccus tenuicornis (Claus, 1863), Asellopsis hispida Brady and
Robertson, 1873, Wellsopsyllus (intermediopsyllus) intermedius (Scott and Scott, 1895) (all
Harpacticoida) are reported for the first time from Sardinia coasts. The copepod community
was particularly rich at Ogliastra Island, a small rocky island with natural reefs, rocky shoals
and Posidonia oceanica meadows. Species found there were mainly related to coarse sands
and macrophytal detritus
Taxonomic and functional biodiversity variations of meiobenthic and nematode assemblages across an extreme environment: a study case in a Blue Hole cave.
No full textIn this paper we have explored for the first time the biodiversity pattern of the meiobenthic assemblage in a Blue Hole of the
Maldivian Archipelago. The cave is characterised by a marked change of the chemical water parameters below 50 m of
depth, with a relevant increase in hydrogen sulfide, carbon dioxide, and sulfates (H2S, CO2 and SO4
2–). Thus, three stations
were selected above and two below the chemo-thermocline in order to test the possible effects of the chemical variations on
the meiobenthos. The difficulty of adaptation to these environmental conditions is clearly suggested by the presence of only
a few dominant meiobenthic taxa in the bottom of the cave. However, meiobenthic organisms seemed more resistant than
macrobenthos, which disappeared completely below this depth. The nematode assemblage was mainly represented by
Xyalidae, Desmodoridae, Comesomatidae and Linhomoeidae. A high level of confinement of nematode genera at the
different depths has been documented. In the upper part, their structure and biodiversity were comparable to those of the
Maldivian subtidal habitats characterised by fine coralline sediments, while a notable dominance was detected in the bottom.
The Blue Hole features also influenced the functional traits of the nematode assemblage with a documented increasing
number of general opportunists and decrease of Maturity Index. The dominance of non-selective deposit feeders supports
the hypothesis of a high amount of organic matter accumulated on the sea bottom of the cave
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
Microstratigrafia e Ciclostratigrafia Nel Cretacico Superiore Dell’appennino Campano. La Successione Di Monte S. Erasmo (Gruppo Del Monte Maggiore)
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