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Are epizoites biological indicators of a western Mediterranean striped dolphin die-off?

REA Auditado

During a die-off of Mediterranean striped dolphins Stenella coeruleoalba in 1990-91, 82 individuals stranded on the Spanish coast were examined for crustacean ectoparasites and epizoites. Six species were detected: Syncyarnus aequus, PenneUa sp., Xenobalanus globicipitis, Conchoderma virgatum, Lepas pectinata and Lepas cf. hillii. The barnacles L. pectinata and L. cf. hillii are reported here for the first time on cetaceans; they were attached to the teeth. C. virgaturn was also found on the teeth; this is an unusual attachment on cetaceans. X.

Tema: general: 

• Ciencias›Biología

The origin of lecithodesmus (Digenea: Campulidae) based on ND3 gene comparison

REA Auditado

Species of Lecithodesmus (Campulidae) occur almost exclusively in baleen whales throughout a wide geographical distribution. Other campulids occur only in odontocetes and, secondarily, in pinnipeds and the sea otter. Therefore, the ancestor of Lecithodesmus might have either cospeciated with mysticetes during the early divergence of mysticete and odontocete cetaceans or originated later via host switching. We evaluate both possibilities based on a phylogenetic analysis.

Tema: general: 

• Ciencias›Biología

Ligophorus pilengas n. sp. (monogenea: ancyrocephalidae) from the introduced so-iuy mullet, mugil soiuy (teleostei: mugilidae), in the sea of Azov and the Black sea

REA Auditado

The monogenean Ligophorus chabaudi was originally described on the gills of the flathead mullet, Mugil cephalus, and was subsequently reported on the So-iuy mullet, Mugil soiuy. However, the morphology of sclerotized parts and multivariate statistical analyses suggest that the form from the So-iuy mullet represents a new species. This study provides a description of the new species Ligophorus pilengas n. sp. and provides additional morphological data concerning the morphology of the ventral bar that might be useful for the diagnosis of Ligophorus. Ligophorus pilengas n. sp.

Tema: general: 

• Ciencias›Biología

Candida albicans UBI3 and UBI4 promoter regions confer differential regulation of invertase production to Saccharomyces cerevisiae cells in response to stress

REA Auditado

Candida albicans ubiquitin genes UBI3 and UBI4 encode a ubiquitin-hybrid protein involved in ribosome biogenesis and polyubiquitin, respectively. In this work we show that UBI3 and UBI4 promoter regions confer differentialexpr ession consistent with the function of their encoded gene products. Hybrid genes were constructed containing the SUC2 coding region under the controlof UBI3 or UBI4 promoters in the yeast vector pLC7.

Tema: general: 

• Ciencias›Biología

Population structure of anisakis simplex (nematoda) in harbor porpoises phocoena phocoena off Denmark

REA Auditado

The population structure and habitat selection of Anisakis simplex in 35 harbor porpoises off Denmark are described. The nematodes were collected from the stomach and duodenal ampulla and were categorized as third-stage larvae, fourth-stage larvae, subadults, and adults. The porpoises harbored 8,043 specimens of A. simplex. The proportion of adults and subadults increased with infrapopulation size. The number of development stages across infrapopulations covaried significantly (Kendall's test of concordance).

Tema: general: 

• Ciencias›Biología

Tagging reveals limited exchange of immature loggerhead sea turtles (Caretta caretta) between regions in the western Mediterranean

REA Auditado

El marcaje revela un intercambio limitado de inmaduros de tortuga boba (Caretta caretta) entre regiones en el Mediterráneo occidental. – Se investigó el intercambio de inmaduros de tortuga boba (Caretta caretta)
entre las regiones septentrional y meridional del Mediterráneo occidental a partir de los datos obtenidos por varios programas españoles de marcaje. El rango de la longitud recta de caparazón de las tortugas marcadas fue de 23 a 74 cm. 36 de ellas se recapturaron tras un intervalo medio de 390,5±462,6 días (DS).

Tema: general: 

• Ciencias›Biología

Aproximación a las comunidades de carófitos que existieron en la Albufera de Valencia a partir del estudio de las oósporas del sedimento

REA Auditado

-Mª A. Rodrigo: Maria.A.Rodrigo@uv.es Las oósporas de carófitos y sus características (tamaño, forma,
color, ornamentación de la pared, etc.) pueden persistir en los
bancos de semillas del sedimento de ecosistemas acuáticos, y
pueden ser utilizadas para identificar los diferentes táxones y
obtener de este modo una aproximación a la composición
florística de las comunidades de carófitos que colonizaron ambientes
acuáticos en los que actualmente no existe vegetación
acuática o se encuentra muy alterada.

Tema: general: 

• Ciencias›Biología

Conformation and concerted dynamics of the integrin-binding site and the C-terminal region of echistatin revealed by homonuclear NMR

REA Auditado

Echistatin is a potent antagonist of the integrins αvβ3, α5β1 and
αIIbβ3. Its full inhibitory activity depends on an RGD (Arg-Gly-
Asp) motif expressed at the tip of the integrin-binding loop and on
its C-terminal tail.

Tema: general: 

• Ciencias›Biología

Contribución al conocimiento de la brioflora de las simas valencianas

REA Auditado

Se da a conocer la bioflora recolectada en 21 simas valencianas, en cuyo interior se han llegado a identificar 33 táxones (7 hepáticas y 26 musgos) de los cuales Anomodon attenuatus (Hedw.) Hub, Cololejeunea rossettiana (Mass.) Schiffn., Eurhynchium praelongum (Hedw.) B.S.G. var. stokesii (Turn.) Dix., Homalia lusitanica Schimp. y Taxiphyllum wissgrillii (Garov.) Wijk. & Marg. son nuevos para la región valenciana. Asimismo se comentan algunos aspectos ecológicos de las simas y los briófitos estudiados.

Tema: general: 

• Ciencias›Biología

Tiam1 as a Signaling Mediator of Nerve Growth Factor-Dependent Neurite Outgrowth

REA Auditado

Nerve Growth Factor (NGF)-induced neuronal differentiation requires the activation of members of the Rho family of small GTPases. However, the molecular mechanisms through which NGF regulates cytoskeletal changes and neurite outgrowth are not totally understood. In this work, we identify the Rac1-specific guanine exchange factor (GEF) Tiam1 as a novel mediator of NGF/TrkA-dependent neurite elongation. In particular, we report that knockdown of Tiam1 causes a significant reduction in Rac1 activity and neurite outgrowth induced by NGF.

Tema: general: 

• Ciencias›Biología