348 research outputs found
Petrosaspongia pharmamari Uriz & Cebrian, 2006, n. sp.
No full text<i>Petrosaspongia pharmamari</i> n. sp. <p>Material examined: 1 Specimen, 15 m depth, rocky bottom, El Hierro, Canary Islands. Holotype Nº CEAB.POR. BIO –190, Centre for Advanced Studies of Blanes, CSIC, Spain.</p> <p>Etymology: The species is dedicated to Pharmamar Company, for leading investigations in the field of new anti­cancer drugs from marine organisms and, particularly, from sponges.</p> <p>Type locality: El Hierro (Canary Islands, North Atlantic) sublittoral.</p> <p>Description</p> <p>External features</p> <p>Massive, lobulose specimen 6 cm high, 8 cm wide. Consistency very hard, almost incompressible. Ectosome detachable from the choanosome in shreds. Choanosome dense. Surface even, microconulose, unarmoured except at the conules, where the end of the primary fibres arises (Fig. 2 A). Oscules inconspicuous. Colour dark brown outside, beige inside.</p> <p>Skeleton</p> <p>Densely reticulate. Formed by irregular meshes of 35–660 m in diameter.</p> <p>Primary fibres: Irregular in thickness (532–975 m), cored with abundant foreign debris (Fig. 2 B).</p> <p>Secondary fibres: Free of foreign debris (45–115 m in diameter) (Fig. 3 B), strongly laminated (Fig. 2 C & 3D). Through SEM, the surface of the secondary fibres appears rippled in a longitudinal direction (Figs. 2 C & D). They form fenestrate plates at the zones where they join the primary fibres (Fig. 4 A).</p> <p>Considerable amounts of sand granules and other foreign materials are scattered throughout the choanosome (Fig. 4 B).</p> <p> Tertiary network made of very thin fibres (8–10 m in diameter) is visible only in some places, as in the type species of <i>Petrosaspongia</i> (Fig. 4 C).</p> <p>Distribution: Canary Islands, El Hierro (North Atlantic), rocky sublittoral, 15 m depth.</p>Published as part of <i>Uriz, María - Jesús & Cebrian, Emma, 2006, Presence of the Indo – Pacific genus Petrosaspongia Bergquist, 1995 (Porifera: Demospongiae) in the Atlantic with description of a new species (P. pharmamari n. sp.), pp. 61-68 in Zootaxa 1209</i> on pages 64-65, DOI: <a href="http://zenodo.org/record/172425">10.5281/zenodo.172425</a>
Are marine heatwaves changing the Mediterranean forever?
No full textThe Med is getting heatstroke. From May to August last year, nearly the entire surface of the Mediterranean was hit by marine heatwaves.
Why are the heatwaves happening, what's the impact on corals and fish, and can we do anything about it?
To discuss this troubling rise in temperatures, Euronews science reporter Jeremy Wilks is joined by Joachim Garrabou, a senior researcher from the Spanish National Research Council and Emma Cebrian, a researcher at the Centre of Advanced Studies of Blanes in SpainPeer reviewe
Petrosaspongia Bergquist 1995
No full textGenus Petrosaspongia Bergquist, 1995 Definition: Unarmoured Thorectinae with a dense secondary fibre reticulum rendering these sponges hard and incompressible. Very thin fibres, which seem to correspond to a tertiary network, are present in some places. Slightly modified from Cook and Bergquist (2002) Type species: Petrosaspongia nigra Bergquist, 1995 by monotypy.Published as part of Uriz, María - Jesús & Cebrian, Emma, 2006, Presence of the Indo – Pacific genus Petrosaspongia Bergquist, 1995 (Porifera: Demospongiae) in the Atlantic with description of a new species (P. pharmamari n. sp.), pp. 61-68 in Zootaxa 1209 on pages 62-63, DOI: 10.5281/zenodo.17242
Petrosaspongia nigra Bergquist 1995
No full textPetrosaspongia nigra Bergquist, 1995 pictures. Description External features Massive–lobulose with an unarmoured microconulose surface. Each conule ends in a thin projecting fibre (Fig. 1 A). Consistency stony, incompressible. Oscules spread on the surface, 1 –2.8 mm in diameter. Colour blackish outside, beige inside, in alcohol. Skeleton Reticulate with a dense network of secondary fibres forming meshes 80–225 m in diameter. They form fenestrate plates when they join the primary fibres. Primary fibres: 355–790 m in thickness, strongly cored by foreign debris (Fig. 1 B) Secondary fibres: 20–80 m (Fig. 3 A), laminated and completely free of foreign debris. (Fig. 1 B–C & Fig. 3 C). Through SEM, the surface of the secondary fibres appears rippled in a longitudinal direction (Fig. 1 C). Tertiary fibres: Very thin, rare. Choanosome containing abundant sand and other foreign materials (Fig. 1 D). Distribution: Southwest Pacific region, New Caledonia islands, from 10 to 38 m depth. Note. The re–examination of the holotype allowed us to measure the skeletal elements, and our results provide larger fibre diameters (particularly for the primary fibres) from those given by Bergquist (1995).Published as part of Uriz, María - Jesús & Cebrian, Emma, 2006, Presence of the Indo – Pacific genus Petrosaspongia Bergquist, 1995 (Porifera: Demospongiae) in the Atlantic with description of a new species (P. pharmamari n. sp.), pp. 61-68 in Zootaxa 1209 on pages 63-64, DOI: 10.5281/zenodo.17242
Transport marítim i espècies invasores
No full textEmma Cebrian, doctora en biologia i investigadora del Grup de Recerca Algues Bentòniques Marines de la Universitat de Girona, explica el procés de les invasions biològiques (introducció, establiment i invasió) i els diferents factors que intervenen en aquestes invasions, principalment el transport marítim1750.mp4
cebrian.mp
Oceanògrafes, bussejant entre la desigualtat
No full textQuan pensem en els oceans i allò del mar endins sempre ens ve al cap Jacques Costeau explicant-los als mars del sud. Però, tot i que invisibles i invisibilitzades, la història està plena d'oceanògrafes remant i nedant contra corrent. En aquest programa ens endinsem en el mar per celebrar-les, per reivindicar-les, perquè elles lideren projectes capdavanters i crucials per a la biodiversitat dels oceans i del planeta. Coneixerem Marta Estrada, pionera, de les primeres dones que van anar a l'Antàrtida. Anirem a la Barceloneta per parlar amb Anna Sànchez-Vidal, professora agregada de la Facultat de ciències de la terra de la Universitat de Barcelona, sobre contaminació per microplàstics. I entrevistarem Emma Cebrian, biòloga marina del Centre d'Estudis Avançats de Blanes; Marta Coll, oceanògrafa i vicedirectora d'estratègia científica de l'Institut de Ciències del Mar, i Cristina Llinares, coordinadora de seguiment de la biodiversitat del mateix centrePeer reviewe
Deep-water macroalgal-dominated coastal detritic assemblages on the continental shelf off Mallorca and Menorca (Balearic Islands, Western Mediterranean)
No full text13 páginas, 2 figuras, 2 tablas.We present a quantitative physiognomic characterization
of major macroalgal-dominated assemblages on
coastal detritic bottoms of the continental shelf off Mallorca
and Menorca (Balearic Islands, Western Mediterranean).
In late spring of 2007 and 2008, 29 samples were
collected by bottom trawling at depths between -52 and
-93 m. These samples were then sorted and identified to
their lowest taxonomic level. Statistical analyses distinguished
six different assemblage types: shallower water
environments (-52 to -65 m in depth) were characterized
by Osmundaria volubilis and Phyllophora crispa meadows
and two types of Peyssonnelia beds; two assemblage types,
Laminaria rodriguezii beds and ma ë rl beds, were only
present in deep-water environments (-77 to -81 m); and an
assemblage dominated by P. crispa and Halopteris filicina
was found in both shallow and deep waters (-57 to -93 m).
We assess the distribution of these six assemblage types
through the studied area.Sampling surveys were supported by the EVADEMED and
INDEMARES projects financed by the IEO and the European
Union. Emma Cebrian ’ s research was funded by the
Juan de la Cierva program (MICINN-JDC).Peer reviewe
Validating Bayesian truth serum in large-scale online human experiments
No full textThis is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Bayesian truth serum (BTS) is an exciting new method for improving honesty and information quality in multiple-choice survey, but, despite the method's mathematical reliance on large sample sizes, existing literature about BTS only focuses on small experiments. Combined with the prevalence of online survey platforms, such as Amazon's Mechanical Turk, which facilitate surveys with hundreds or thousands of participants, BTS must be effective in large-scale experiments for BTS to become a readily accepted tool in real-world applications. We demonstrate that BTS quantifiably improves honesty in large-scale online surveys where the "honest" distribution of answers is known in expectation on aggregate. Furthermore, we explore a marketing application where "honest" answers cannot be known, but find that BTS treatment impacts the resulting distributions of answers
Marine invasion in the mediterranean sea: The role of Abiotic factors when there is no biological resistance
No full text8 páginas, 7 figuras, 3 tablasThe tropical red alga Womersleyella setacea (Rhodomelaceae, Rhodophyta) is causing increasing concern in the
Mediterranean Sea because of its invasive behavior. After its introduction it has colonized most Mediterranean areas, but
the mechanism underlying its acclimatization and invasion process remains unknown. To understand this process, we
decided i) to assess in situ the seasonal biomass and phenological patterns of populations inhabiting the Mediterranean Sea
in relation to the main environmental factors, and ii) to experimentally determine if the tolerance of W. setacea to different
light and temperature conditions can explain its colonization success, as well as its bathymetric distribution range. The
bathymetric distribution, biomass, and phenology of W. setacea were studied at two localities, and related to irradiance and
temperature values recorded in situ. Laboratory experiments were set up to study survival, growth and reproduction under
contrasting light and temperature conditions in the short, mid, and long term.Results showed that, in the studied area, the
bathymetric distribution of W. setacea is restricted to a depth belt between 25 and 40 m deep, reaching maximum biomass
values (126 g dw m22
) at 30 m depth. In concordance, although in the short term W. setacea survived and grew in a large
range of environmental conditions, its life requirements for the mid and long term were dim light levels and low
temperatures. Biomass of Womersleyella setacea did not show any clear seasonal pattern, though minimum values were
reported in spring. Reproductive structures were always absent. Bearing in mind that no herbivores feed on Womersleyella
setacea and that its thermal preferences are more characteristic of temperate than of tropical seaweeds, low light (50 mmol
photon m22 s
21
) and low temperature (12uC) levels are critical for W. setacea survival and growth, thus probably
determining its spread and bathymetric distribution across the Mediterranean Sea.: This work was supported by an European Union reintegration grant (ERG-2009-248252) and a grant from the Spanish Ministry of Science and
Innovation (CGL2004-05556-C02-01). Dr. Cebrian was funded by a Juan de la Cierva program (JCI-2008-02753) of the Spanish Science and Innovation MinistryPeer reviewe
- …
