1,721,022 research outputs found
FIGURE 5 in Syllidae (Annelida: Phyllodocida) from the deep Mediterranean Sea, with the description of three new species
No full textFIGURE 5. Parexogone wolfi San Martín, 1991 (St. 8, 110 m). a) anterior end in dorsal view; b) compound chaetae. Scale-bar: a: 0.30 mm; b‒d: 15 µm.Published as part of Langeneck, Joachim, Musco, Luigi, Busoni, Giulio, Conese, Ilaria, Aliani, Stefano & Castelli, Alberto, 2018, Syllidae (Annelida: Phyllodocida) from the deep Mediterranean Sea, with the description of three new species, pp. 197-220 in Zootaxa 4369 (2) on page 206, DOI: 10.11646/zootaxa.4369.2.3, http://zenodo.org/record/113567
FIGURE 3. Exogone sophiae n in Syllidae (Annelida: Phyllodocida) from the deep Mediterranean Sea, with the description of three new species
No full textFIGURE 3. Exogone sophiae n. sp. Paratype (MSNP: P/0242/V) a) anterior end in dorsal view. Holotype (MSNP: P/3879): b) pygidium in dorsal view; c) spiniger-like chaeta from chaetiger 5; d) compound falciger chaetae from chaetiger 5; e) dorsal simple chaeta. Scale-bar: a‒b: 0.20 mm; c‒d‒e: 7 µm.Published as part of Langeneck, Joachim, Musco, Luigi, Busoni, Giulio, Conese, Ilaria, Aliani, Stefano & Castelli, Alberto, 2018, Syllidae (Annelida: Phyllodocida) from the deep Mediterranean Sea, with the description of three new species, pp. 197-220 in Zootaxa 4369 (2) on page 203, DOI: 10.11646/zootaxa.4369.2.3, http://zenodo.org/record/113567
FIGURE 8 in Syllidae (Annelida: Phyllodocida) from the deep Mediterranean Sea, with the description of three new species
No full textFIGURE 8. Syllis sp. 1 (St. 12, 900 m): a) anterior end in dorsal view; b) long spiniger-like chaeta from anterior chaetigers; c) short spiniger-like chaeta from anterior chaetigers; d) falcigers chaetae from anterior chaetigers. Scale-bar: a: 0.5 mm; b‒d: 20 µm.Published as part of Langeneck, Joachim, Musco, Luigi, Busoni, Giulio, Conese, Ilaria, Aliani, Stefano & Castelli, Alberto, 2018, Syllidae (Annelida: Phyllodocida) from the deep Mediterranean Sea, with the description of three new species, pp. 197-220 in Zootaxa 4369 (2) on page 212, DOI: 10.11646/zootaxa.4369.2.3, http://zenodo.org/record/113567
Distribution and diversity of polychaetes along a bathyal escarpment in the western Mediterranean Sea
No full textKnowledge of the diversity of deep-sea polychaetes in the Mediterranean Sea is still scarce and fragmentary, due to the absence of comprehensive taxonomic revisions of several families, with the majority of recent works relying on higher level taxonomy. In the present work samples were collected with a box-corer along the Sardinian Slope, a bathyal escarpment area located in the western Mediterranean Sea, at seven depth levels separated from each other by a 300 m interval, ranging from 600 to 2400 m. Samples were sifted with a 0.3 mm mesh, and polychaetes were identified at the lowest taxonomic level and characterised from the biogeographic and tropho-functional point of view. Ninety-seven taxa were recorded, 60 of which identified at the species level; eight taxa are likely to be undescribed species, possibly endemic to the Mediterranean Sea, whereas another seven are reported for the first time for the Mediterranean Sea. The majority of taxa shows an Atlantic-Mediterranean or strictly Mediterranean distribution, thus confirming the similarity between Atlantic and Mediterranean deep-sea assemblages, but also the unicity of the latter. Conversely, cosmopolitan taxa, usually considered common in deep-sea assemblages, represented a minor component. The trophic guild composition of the assemblage varied along the slope, with shallower assemblages (600–900 m) including a relatively high percentage of predators and microphagous omnivores, while deeper assemblages (1500–1800 m) showed a > 90% percentage of deposit- and filter-feeders, with the 1200 m assemblage characterised by intermediate features. This outcome suggests that in the presently investigated area, the environmental conditions of shallower samples allow the stable occurrence of at least two trophic levels, whereas deeper assemblages depend mainly on organic matter coming from shallower levels and from the water column. The examined polychaete assemblages are characterised by low density and a complete absence of dominance, with the evenness index J’ ranging from 0.72 to 1; the wide ranges of the H’ index (0.50–2.67) and of Hill's N1 (1.65–14.65) suggest a high variability at low spatial scale. If compared to Atlantic deep-sea polychaete assemblages the assemblage studied shows an almost ten-fold lower organism abundance, but species diversity is only two- to four-fold lower, suggesting that biodiversity in Mediterranean deep-sea environments is possibly underestimated. Diversity of polychaete assemblages in the deep Mediterranean Sea is likely to be underestimated due to their low density, and adequate sampling strategies should be planned to have a better insight into the functioning and diversity of these communities
FIGURE 7. Syllis profunda Cognetti, 1955 in Syllidae (Annelida: Phyllodocida) from the deep Mediterranean Sea, with the description of three new species
No full textFIGURE 7. Syllis profunda Cognetti, 1955. Holotype (SZN: SZN-POL31, Grotta Azzurra, 100 m): a) compound chaetae from the anterior part of the body; b) aciculae from the anterior part of the body; c) compound chaetae from the midbody; d) aciculae from the midbody; e) compound chaetae from the posterior part of the body; f) acicula from the posterior part of the body. Nontype individual (St. 9, 180 m): g) anterior end in dorsal view. Scale-bar: a‒f: 30 µm; g: 0.40 mmPublished as part of Langeneck, Joachim, Musco, Luigi, Busoni, Giulio, Conese, Ilaria, Aliani, Stefano & Castelli, Alberto, 2018, Syllidae (Annelida: Phyllodocida) from the deep Mediterranean Sea, with the description of three new species, pp. 197-220 in Zootaxa 4369 (2) on page 210, DOI: 10.11646/zootaxa.4369.2.3, http://zenodo.org/record/113567
Parexogone campoyi
No full textParexogone campoyi San Martín, Ceberio & Aguirrezabalaga, 1996 Exogone (Parexogone) campoyi San Martín et al. 1996: 252 ‒255, Figs 4‒5; San Martín 2003: 244 ‒247, Figs 131‒132. Parexogone campoyi Barroso et al. 2017: 408 ‒411, Figs 4‒6. Material examined. St. 5: 1 individual; St. 11: 4 individuals; St. 12: 8 individuals; St. 13: 9 individuals; St. 14: 3 individuals; St. 15: 1 individual; St. 17: 2 individuals; St. 18: 2 individuals; St. 20: 1 individual. Distribution. Eastern Atlantic Ocean (San Martín et al. 1996); Mediterranean Sea (Simboura & Zenetos 2005; Langeneck et al. 2017; present data); western Atlantic Ocean (Barroso et al. 2017). Remarks. The examined individuals correspond to the original description (San Martín et al. 1996). P. campoyi is the most abundant Syllidae in Mediterranean deep environments below 900 m depth analysed in this study.Published as part of Langeneck, Joachim, Musco, Luigi, Busoni, Giulio, Conese, Ilaria, Aliani, Stefano & Castelli, Alberto, 2018, Syllidae (Annelida: Phyllodocida) from the deep Mediterranean Sea, with the description of three new species, pp. 197-220 in Zootaxa 4369 (2) on page 205, DOI: 10.11646/zootaxa.4369.2.3, http://zenodo.org/record/113567
Determinazione del tasso di crescita dell'alga corallina elongata (Rhodophyta) in ambiente controllato e in ambiente naturale tramite utilizzo dei marcatori alizarin (red) e calcofluor white
Full text linkL’ordine Corallinales (Rhodophyta) è caratterizzato da alghe calcaree in grado di costruire strutture biogeniche giocando un ruolo chiave come promotori di biodiversità e produttori di carbonato di calcio. Per la loro importanza come indicatori ambientali, è stato effettuato uno studio con lo scopo di acquisire dati relativi al tasso di crescita di
Corallina elongata in ambiente naturale (Lerici, La Spezia) e controllato utilizzando due diversi tipi di marcatori: Alizarin (red) e Calcofluor white. I risultati ottenuti hanno mostrato il successo dell'Alizarin (red) rispetto al Calcofluor white. Per quanto riguarda i tassi di crescita C. elongata, è cresciuta maggiormente in condizioni naturali rispetto a
quelle controllate. Sono state trovate, inoltre, differenze statisticamente significative nei tassi di crescita in ambiente naturale dopo 30 e 90 giorni, con una crescita maggiore nei primi 30 giorni. Tali differenze potrebbero essere attribuite alla presenza del bivalve Mytilus galloprovincialis nell'area di studio.The order Corallinales (Rhodophyta) is characterized by calcareous algae able to build biogenic structures, thus playing a key-role as marine biodiversity promoters and as calcium carbonate producers. Due to their importance as environmental bio-indicators, a pilot study of the growth rate of Corallina elongata was conducted in its natural
condition (Lerici, La Spezia) and laboratory setting using two staining methods with Alizarin (red) and Calcofluor white. The results show the success of Alizarin (red) as a growth marker compared to Calcofluor white. C. elongata showed a higher growth rates in situ compare to the cultured specimen. Moreover there is a significant differences
between the growth rate in natural conditions after 30 and 90 days, with a decrease in growth rates after 30 days. These differences are likely to be related to the increase of Mytilus galloprovincialis population which occupies the same habitat zone of C. elongata
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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