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DIALNET OAI Articles (492.798 recursos)
Dialnet (Difusión de Alertas en la Red) es una plataforma de recursos y servicios documentales, cuyo objetivo fundamental se centra en mejorar la visibilidad y el acceso a la literatura científica hispana a través de Internet.

Ciencias biológicas

Mostrando recursos 1 - 20 de 18.601

1. Diagnótico molecular de la infección con Trypanosoma cruzi en ratones - Zuñiga, Claudia; Ponzano, P.; Romo, G.; Larenas, J.; Vergara, U.; García, A; Paláu, M. T.
Mice from CF1 and A.Sw strains were experimentally infected with 2000 Dm28c trypomastigotes of Trypanosoma cruzi. Although both mouse groups showed a similar prepatent period of three days after initial infection, the number of free parasites in bloodstream and the percentage of accumulated mortality were significantly different. Nine days after infection, the CF1 mice showed a maximum parasitemia level of only 8,7 x 104 ± 1,2 x 103 parasites/mL, while A.Sw mice reached a significant higher level of 24,7 x 104 ± 2,5 x 103 parasites/mL (p < 0,0069), at the seventeenth day of infection After the peak of parasitemia,...

2. Analysis of the effect of atmospheric oscillations on physical condition of pre-reproductive bluefin tuna from the Strait of Gibraltar - Báez, José C.; Macías, David; Castro, Maite de; Gómez-Gesteira, M.; Gimeno Presa, Luis; Real, Raimundo
Analysis of the effect of atmospheric oscillations on physical condition of pre�reproductive bluefin tuna from the Strait of Gibraltar.� The aim of this study was to explore the possible effects of atmospheric oscillations: North Atlantic Oscillation (NAO) and Arctic Oscillation (AO), on the physical condition of bluefin tuna (Thunnus thynnus). We estimated a fitness ratio from 3,501 pairs of length�weight data based on bluefin tuna caught in bait�boat fisheries before the spawning season (January, February and March), for each length class and year. In order to obtain a single fitness ratio (K�mean) per year we determined the average for all...

3. Descripción de tres nuevas especies de tetigónidos de Costa Rica (Orthoptera, Tettigoniidae) - Barranco Vega, Pablo
Description of three new species of katydids from Costa Rica (Orthoptera, Tettigoniidae).-Three new species of katydids from the Reserva Biológica Alberto Manuel Brenes (Alajuela) in Costa Rica (Central America) are described. The specimens were collected in the course of the Project INVARTRAB developed by the Central University of Costa Rica and the INIA de Madrid (España). The specimens were sampled by direct prospection on plants and light traps. The new species belong to the genera Phlugis, Scopiorinus and Viadana, respecti­ vely. Phlugis ramirezi n. sp. has little developed tegmens and wings, male tenth abdominal tergite ending in two spiniform processes, cerci...

4. Pets becoming established in the wild: free-living Vietnamese potbellied pigs in Spain - Delibes-Mateos, Miguel; Delibes de Castro, Adolfo
Los cerdos vietnamitas (Sus scrofa) son una mascota habitual en Norteamérica y Europa; sin embargo, su popularidad ha disminuido recientemente y esto ha provocado que se abandonen cada vez más. El objetivo principal de este trabajo es identificar casos de cerdos vietnamitas que viven en libertad en España a través de una búsqueda exhaustiva en Google. Se han identificado 42 casos de cerdos vietnamitas que viven en libertad distribuidos por todo el país. El número de casos aumenta cada año, aunque la abundancia de la especie aún parece ser baja. También se han observado indicios de que los cerdos vietnamitas...

5. Spatial distribution patterns of terrestrial bird assemblages on islands of the Sabana-Camagüey Archipelago, Cuba: evaluating nestedness and co-occurrence patterns - Mancina, Carlos A.; Rodríguez Batista, Daysi; Ruiz Rojas, Edwin
Spatial distribution patterns of terrestrial bird assemblages on islands of the Sabana-Camagüey Archipelago, Cuba: evaluating nestedness and co-occurrence patterns.- Using distribution data of 131 terrestrial bird species on 17 islands of the Archipelago Sabana-Camagüey, Cuba, we tested for non-randomness in presence-absence matrices with respect to co-occurrence and nestedness. We conducted separate analyses for the whole assemblage and sub-matrices according to trophic levels and residence status (breeding and migratory). We also explored the influence of weighting factors such as island area and isolation. The C-occurrence analyses were susceptible to the species subsets and the weighting factors. Unweighted analyses revealed a significant negative...

6. El viaje del Prof. Emil A. Rossmässler en 1853 por España y la localidad tipo de Iberus angustatus (Rossmässler, 1854) (Gastropoda, Helicidae) - Martínez Ortí, Alberto; Robles, F.
The journey of Prof. Emil A. Rossmässler in 1853 in Spain and the type locality of Iberus angustatus (Rossmässler, 1854) (Gastropoda, Helicidae).- We have identified the type locality of Helix Guiraoana var. angustata Rossmässler, 1854 as 'located in the heights surrounding the Venta del Molinillo near the Sierra de los Dientes de la Vieja, Diezma, Granada', from the description given by Rossmässler about his journey in the south east of Spain in 1853. The molecular analysis (COI and 16S) of a topotype collected live allowed us to confirm the identification of clade 4 of the genus Iberus proposed by Elejalde...

7. European rabbit restocking: a critical review in accordance with IUCN (1998) guidelines for re-introduction - Guerrero-Casado, José; Letty, Jérôme; Tortosa, Francisco S.
European rabbit restocking: a critical review in accordance with IUCN (1998) guidelines for re-introduction.- European rabbit restocking is one of the most frequent actions in hunting estates and conservation projects in Spain, France and Portugal where rabbit is a keystone species. The aim of this work was to review current knowledge regarding rabbit restocking in accordance with the IUCN (1998) guidelines for re¿introduction in order to identify gaps in knowledge and highlight the techniques that improve the overall success rate. Eight of 17 items selected from these guidelines were identified as partly studied or unknown, including important items such as the...

8. Trophy hunting, size, rarity and willingness to pay: inter-specific analyses of trophy prices require reliable specific data - Sarasa, Mathieu
Trophy hunting, size, rarity and willingness to pay: inter�specific analyses of trophy prices require reliable specific data.� Awareness of the importance of the wildlife trade and human perception in animal conservation is growing. Recent studies carried out on a continental and world scale have analysed the associations between trophy score, rarity and prices. As a large range of ungulates are legally hunted throughout the world and numerous ungulate taxa are threatened, the relationship between rarity and trophy prices has been studied in several species. This article briefly reviews verifiable data on species and trophy prices and compares findings with data...

9. Exotic tree plantations and avian conservation in northern Iberia: a view from a nest-box monitoring study - Hera Fernández, Iván de la; Arizaga Martínez, Juan; Galarza Ibarrondo, Aitor
Exotic tree plantations and avian conservation in northern Iberia: a view from a nest¿box monitoring study.- The spread of exotic tree plantations on the North Atlantic coast of the Iberian peninsula raises concern regarding the conservation of avian biodiversity as current trends suggest this region might become a monoculture of Australian Eucalyptus species. To shed more light on the factors promoting differences in avian communities between and within exotic tree (Monterey Pine Pinus radiata and Eucalyptus spp.) plantations and native forests in the Urdaibai area (northern Spain), this study aimed to explore (1) how the type of habitat and vegetation...

10. Duvalius (Duvalius) lencinai Mateu & Ortuño, 2006 (Coleoptera, Carabidae, Trechini) una especie hipogea del sur de la península ibérica. Morfología, reubicación taxonómica, sistemática y biología - Ortuño, Vicente M.; Barranco Vega, Pablo
Duvalius (Duvalius) lencinai Mateu & Ortuño, 2006 (Coleoptera, Carabidae, Trechini) a hypogean species from the south of the Iberian peninsula. Morphology, new taxonomic placement, systematics and biology.- Duvalius (Duvalius) lencinai Mateu & Ortuño, 2006 was discovered in two new localities in the municipal district of Siles (Jaen, Spain): Sima Curva del Espino and Sima de los 30 Años, approximately 10 and 17 km, respectively, away from the type locality. The study of several individuals through dissection and use of optic and electronic microscopic preparations has increased the knowledge of the anatomy of this species. Evagination of the internal sac allowed...

11. Tegumental ultrastructure of Echinostoma caproni adults (Trematoda: Echinostomatidae) - Marcilla, A.; Trelis, M.; Fried, B.; Esteban, J.G.; Toledo, R.; Sotillo, J.; Trudgett, A.; Cortés, A.
The Echinostoma caproni-rodent model has been extensively used to determine the factors implicated in the expulsion or the establishment of chronic infections in the definitive host. Although several studies regarding the tegumental sensory papillae and spines or the spined collar have been conducted on the E. caproni adult, none of them has correlated these morphological features with the expulsion or the establishment of the parasite in its definitive host. In order to investigate the role of the collar spines and sensory papillae more fully we have performed scanning electron microscopy studies. We have studied the tegumental morphology in specimens collected...

12. Estructura secundaria y mapa de variabilidad de la subunidad pequeña del ARNr de Entamoeba: posibles implicaciones para la taxonomía del género - Alfonso, S.; Martínez-Díaz, R. A.; Ponce-Gordo, F.
The molecular taxonomy of the genus Entamoeba based on sequence comparisons of the small subunit rRNA (16S-rRNA) is confused as there are different criteria regarding the number and importance of the sequence differences for species or subspecies identification. In the present work we analyze the importance of the sequence differences and we identify the regions that could be potentially useful for taxonomic studies. We propose a secondary structure model of the Entamoeba 16S-rRNA obtained by homology modeling after analysis of 25 complete sequences belonging to 19 species. From this model we have determined the variability map of this gene this...

13. Avifauna reproductora e invernante en abedulares de la montaña cantábrica - Costa, L.; Purroy, Francisco J.

14. Potencial reproductor del cladócero planctónico "Evadne nordmanni" Loven (Crustacea, Branchiopoda) en las aguas costeras del Cantábrico Central - Perez, M.C.

15. Censo, fenología y éxito reproductor del Aguilucho lagunero (Circus aeruginosus L.) en Navarra - Fernandez, C

16. Anuros Pleistocénicos de la Cueva de las Hienas (Las Caldas, Asturias) - Martín Albaladejo, Carolina; Sanchiz Gil de Avalle, Francisco de Borja

17. Estructura estacional de las comunidades de Passeriformes en una marisma del País Vasco atlántico - Grandio, J.M.; Belzunce, J.A.

18. Zooplanktoni buruzko aurreikerketa koantitatiboa Gernika-Mundakako itsasadearrean - Villate Guinea, Fernando

19. Araba, Bizkaia eta Gipuzkoako landare katalogoari eraskin eta zuzenketak - Aperribai, J.A.; Garin, P; Aizpuru Oiarbide, Iñaki

20. Algunas plantas navarras de interés corológico (III) - Aseginolaza Iparraguirre, Carlos; Urrutia, Pello; Aizpuru Oiarbide, Iñaki; Uribe-Echebarría Díaz, Pedro María

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