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Digital.CSIC (158.952 recursos)

Repositorio institucional del Consejo Superior de Investigaciones Científicas. Digital.CSIC es un depósito de documentos digitales, cuyo objetivo es organizar, archivar, preservar y difundir en modo de acceso abierto la producción intelectual resultante de la actividad investigadora del CSIC.

(EBD) Artículos post-print

Mostrando recursos 1 - 20 de 70

  1. Diet Explains Interpopulation Variation of Plasma Carotenoids and Skin Pigmentation in Nestling White Storks

    Negro, Juan J.; Tella, José Luis; Blanco, Guillermo; Forero, Manuela G.; Garrido Fernández, J.
    Carotenoids have a dietary origin in birds, but mechanisms by which they are absorbed in the gut, transported in the blood, metabolized at various sites, and deposited in the integument remain poorly understood. Variation in both plasma carotenoid levels and external color may reflect different access to dietary carotenoids or individual physiological differences in the uptake and deposition of carotenoids. We compared total plasma ca- rotenoid concentration in nestling white storks (Ciconia ci- conia) from 11 Spanish colonies in two consecutive years. The main food item in one of the colonies was the red swamp crayfish (Procambarus clarkii), a recently...

  2. Astaxanthin is the major carotenoid in tissues of white storks (Ciconia ciconia ) feeding on introduced crayfish (Procambarus clarkii )

    Negro, Juan J.; Garrido Fernández, J.
    We studied the carotenoid pigments in plasma, skin and body fat of white storks (Ciconia ciconia ) from a colony in Spain feeding mainly on the recently introduced red swamp crayfish (Procambarus clarkii ). In control colonies, where crayfish was absent, plasma was collected for comparison. Our objective was to determine whether the astaxanthin contained in the crayfish reached the blood, accumulated in fat, and finally was deposited in the red-colored bill and legs. If that was true, the visual cues provided by those tegumentary areas would be altered, with potential behavioral consequences. Plasma carotenoids were directly extracted with acetone,...

  3. Fat stores in birds: an overlooked sink for carotenoid pigments?

    Negro, Juan J.; Figuerola, Jordi; Garrido Fernández, J.; Green, Andy J.
    Peer reviewed

  4. Astaxanthin from crayfish (Procambarus clarkii) as a pigmentary ingredient in the feed of laying hens

    Pérez Gálvez, Antonio; Mínguez Mosquera, María Isabel; Negro, Juan J.; Garrido Fernández, J.; Cascajo Almenara, M. V.
    7 pages, 4 figures, 3 tables.

  5. Environmental constraints for plumage melanization in the northern goshawk Accipiter gentilis

    Galván, Ismael; Bijlsma, R. G.; Negro, Juan J.; Jarén-Galán, Manuel; Garrido Fernández, J.
    Although it is recognized that certain environmental factors are important determinants of the expression of melanin- based traits, their influence in wild populations of animals is poorly known. One of these factors is the availability of amino acids that serve as precursors of melanins. Here we measured eumelanin and pheomelanin content in feathers of northern goshawk Accipiter gentilis nestlings, hypothesizing that, if the availability of melanin precursors is related to food abundance and habitat quality, plumage melanization should be affected by those variables. Although the eumelanin content increased with food abundance as predicted, the levels of this variable were higher...

  6. Multiple sexual ornaments signal heterozygosity in male blue tits

    Ferrer, Esperanza S.; García-Navas, Vicente; Bueno-Enciso, Javier; Sanz, Juan José; Ortego, Joaquín
    Higher individual genetic quality has been hypothesized to be associated with the expression of conspicuous ornaments. However, the relationship between multicomponent sexual signals and heterozygosity is poorly understood. In this study, we examined whether different ornaments, including song (repertoire size and bout length) and plumage coloration (yellow breast and blue crown), reflect individual genetic diversity in male blue tits (Aves: Cyanistes caeruleus). We estimated genetic diversity using 26 microsatellite markers that were classified as putatively functional (12 loci) and neutral (14 loci). We found that yellow breast carotenoid chroma, blue crown brightness, bout length and body condition were positively associated...

  7. Are Farm-Reared Quails for Game Restocking Really Common Quails (Coturnix coturnix)?: A Genetic Approach

    Sanchez-Donoso, Inés; Vilà, Carles; Puigcerver, Manel; Butkauskas, Dalius; Caballero de la Calle, José Ramón; Morales-Rodríguez, Pablo Antonio; Rodríguez-Teijeiro, José D.
    The common quail (Coturnix coturnix) is a popular game species for which restocking with farm-reared individuals is a common practice. In some areas, the number of released quails greatly surpasses the number of wild breeding common quail. However, common quail are difficult to raise in captivity and this casts suspicion about a possible hybrid origin of the farmed individuals from crosses with domestic Japanese quail (C. japonica). In this study we used a panel of autosomal microsatellite markers to characterize the genetic origin of quails reared for hunting purposes in game farms in Spain and of quails from an experimental...

  8. Seedling establishment in Olea europaea: Seed size and microhabitat affect growth and survival

    Rey, Pedro J.; Alcántara, Julio M.; Valera, Francisco; Sánchez-Lafuente, A.M.; Garrido, José L.; Ramírez, José M.; Manzaneda, Antonio J.
    We investigated the effects of seed size and microhabitat on the dynamics of seedling establishment in Olea europaea. We tested the hypothesis that the type of microhabitat suitable for O. europaea recruitment is influenced by microhabitat-specific relationships between seed size and seedling growth rate. To test this hypothesis we conducted field experiments evaluating seedling growth and survival as a function of seed size, microhabitat (determined by presence/absence of scrub cover), and competition (established by means of seedling density gradients). Our results show that, first, seed size was related to seedling size and to differential growth rate. Second, seedling growth rate...

  9. Widespread exposure to Sarcoptes scabiei in wild European rabbits (Oryctolagus cuniculus) in Spain

    Millán, J.; Casais, Rosa; Delibes-Mateos, Miguel; Calvete, C.; Rouco, Carlos; Castro, Francisca; Ramírez, Esther; Moreno, Sacramento; Prieto, José M.; Villafuerte, Rafael
    et al.

  10. Attractive non-mimetic stimuli in Cuckoo Cuculus canorus eggs

    Álvarez, Fernando
    Peer Reviewed

  11. Ontogenetic variation in the plumage colour of female European Pied Flycatchers Ficedula hypoleuca

    Potti, Jaime; Canal, David; Camacho, Carlos
    Although variation in the dorsal plumage colour of male European Pied Flycatchers Ficedula hypoleuca has received a great deal of attention, females of the species have been usually considered to be nearly uniformly monochromatic brown. Using reflectance spectrophotometry, we explore the age-dependent variation of plumage colour in females. We disentangle the within- and between-individual effects of this pattern and show a within-individual darkening of the mantle colour with age, whereas differences between individuals in structural colour expression may underlie the trend for a more reflective white in the females' breast plumage with advancing age. The darkening of the dorsal plumage...

  12. New records and comments for the Mauritanian mammal fauna

    Padial, José M.; Ibáñez, Carlos
    Peer reviewed

  13. Living on the edge: the role of geography and environment in structuring genetic variation in the southernmost populations of a tropical oak

    Ortego, Joaquín; Bonal, Raúl; Muñoz, Alberto; Espelta, Josep Maria
    Understanding the factors determining genetic diversity and structure in peripheral populations is a long-standing goal of evolutionary biogeography, yet little empirical information is available for tropical species. In this study, we combine information from nuclear microsatellite markers and niche modelling to analyse the factors structuring genetic variation across the southernmost populations of the tropical oak Quercus segoviensis. First, we tested the hypothesis that genetic variability decreases with population isolation and increases with local habitat suitability and stability since the Last Glacial Maximum (LGM). Second, we employed a recently developed multiple matrix regression with randomisation (MMRR) approach to study the factors...

  14. Feeding ecology and trophic position of three sympatric demersal chondrichthyans in the northwestern Mediterranean

    Albo Puigserver, Marta; Navarro, Joan; Coll, Marta; Aguzzi, Jacopo; Cardona, Luis; Sáez‑Liante, Raquel
    14 pages, 5 figures, 3 tables, supplementary material

  15. The diet of Great Tit Parus major nestlings in a Mediterranean Iberian forest: The important role of spiders | Dieta de los pollos de Carbonero Común Parus major en un bosque Ibérico Mediterraneo: La importáncia de las arañas

    Pagani-Núñez, E.; Ruiz, Iker; Quesada, J.; Senar, Juan Carlos
    The diet of the Great Tit Parus major when rearing chicks has been described in many studies. However, data from the Mediterranean area is scarce. Here we describe the diet of nestlings in a population of Great Tits in a Mediterranean forest in Barcelona (north-east Spain) during two breeding seasons using two methods: neck-collars and video recording. The main prey were caterpillars (44% from neck-collar data and 62% from video-recorded data), but in our latitudes spiders also seemed to be an important food resource (24% from neck-collar data and 42% from video-recorded data). We did not find any significant differences...

  16. The liver but not the skin is the site for conversion of a red carotenoid in a passerine bird

    Val, Esther del; Senar, Juan Carlos; Garrido Fernández, J.; Jarén-Galán, Manuel; Borràs, Antoni; Cabrera, Josep; Negro, Juan J.
    Carotenoids may provide numerous health bene- fits and are also responsible for the integumentary colora- tion of many bird species. Despite their importance, many aspects of their metabolism are still poorly known, and even basic issues such as the anatomical sites of conversion remain controversial. Recent studies suggest that the transformation of carotenoid pigments takes place directly in the follicles during feather growth, even though the liver has been previously recognised as a storing organ for these pigments with a certain potential for conversion. In this context, we analysed the carotenoid profile of plasma, liver, skin and feathers of male...

  17. Hepatic conversion of red carotenoids in passerine birds

    Val, Esther del; Senar, Juan Carlos; Garrido Fernández, J.; Jarén-Galán, Manuel; Borràs, Antoni; Cabrera, Josep; Negro, Juan J.
    Peer reviewed

  18. Two pieces of information in a single trait? The yellow breast of the great tit (Parus major) reflects both pigment acquisition and body condition

    Senar, Juan Carlos; Negro, Juan J.; Quesada, Javier; Ruiz, Iker; Garrido Fernández, J.
    Carotenoid-based plumage coloration has been shown to be dependent both on pigment content and feather structure. Against this background, we predict a relationship between feather pigment content and plumage hue. Furthermore, given the susceptibility of chroma to developmental perturbation of feather structure, we predict body condition to be related to chroma. We tested these predictions in the great tit, Parus major. Carotenoid content in yellow breast feathers was analysed by high-performance liquid chromatography (HPLC). Lutein was the main carotenoid contained in great tit feathers, followed by zeaxanthin. The hue of the feathers was accurately predicted from their lutein concentration, and chroma was predicted from the body condition value....

  19. The mating call of Pelodytes ibericus (Anura, Pelodytidae)

    Pargana, J.M.; Márquez, R.; Reques, Ricardo; Sánchez-Herráiz, M.J.; Tejedo, Miguel; Crespo, Eduardo G.
    Peer Reviewed

  20. Reg outcome in an alarm situation in zebra finches

    Álvarez, Fernando
    Micro-PK was explored in zebra finches (Taeniopygia guttata) to test the hypothesis of nondirectional REG randomness reduction during an alarm situation. A 15-s video clip of a crawling snake was presented to 80 participants and a REG's outcome during the presentation of the stimulus was analysed under three conditions: Bird Alone, Bird Plus Observer, and Observer Alone. One 200-bit trial was collected every quarter of a second during die presentation of the stimulus and the 5-min control period before die start of die disturbing stimulus, and the obtained cumulative chi-square deviation scores were analysed. The finding diat die scores during...

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