Pérez Tris, Javier

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First Name
Last Name
Pérez Tris
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Biológicas
Biodiversidad, Ecología y Evolución
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Now showing 1 - 10 of 41
  • Publication
    BioEmprende: Biología para el empleo
    (2015) Vázquez Estévez, Covadonga; González Jaén, Mª Teresa; Pérez Corona, Esther; Cabrero Sañudo, Francisco José; Marco López, Eva; Naranjo Pompa, Tomás; Santos Martínez, Tomás; Valderrama Conde, Mª José; Silóniz Jiménez, Mª Isabel; Patiño Álvarez, Belén; Carballo Cuervo, Serafín; de la Mata Riesco, Isabel; Pérez Tris, Javier; Acebal Sanabria, Carmen; Jiménez Pinillos, Juan; Gil-Serna, Jéssica; Wrent, Petra; Gil de Prado, Elena; Rivas Fernández, Eva; García Rubio, Rocío
    El proyecto pretende fomentar acciones encaminadas a la inserción en el mercado laboral, dar visibilidad a los convenios firmados y prácticas en empresas, acceso directo a redes de empleo internacionales y potenciar a bioemprendedores.
  • Publication
    Maternal Genetic Structure Reveals an Incipient Differentiation in the Canary Islands Chiffchaff Phylloscopus canariensis
    (Sociedad Española de Ornitología (SEO/BirdLife), 2020-07) Illera, Juan Carlos; Ramírez García, Álvaro; Rodríguez, Laura; Polypathellis, Konstantinos; Pérez Tris, Javier
    The Canary Islands are characterised by an outstanding level of biodiversity with a high number of endemic taxa. The Canarian avifauna is no exception and six extant avian species are recognised as endemic. However, we have a limited understanding of the genetic structure of these taxa, which makes it difficult to identify conservation priorities based on the existence of unique lineages. we analysed the diversification process and demography of the Canary Islands Chiffchaff Phylloscopus canariensis using two mitochondrial genes (cytochrome b and cytochrome oxidase subunit I). Although the species colonised the Canary Islands during the early Pleistocene, our results suggest a recent process of differentiation, which ran in parallel to the Last Glacial Maximum. Chiffchaffs from Gran Canaria emerge as a unique lineage since none of the haplotypes found on this island were recorded anywhere else in the archipelago. Our findings suggest a process of divergence according to the gradual colonisation and subsequent isolation of nearby islands. Demographic results show a stable trend of Chiffchaff populations until the colonisation of Gran Canaria (ca. 15,000 years ago), where the species significantly increased its effective population size. Nowadays, the effective population size of the Canary Islands Chiffchaff is stable, which highlights the ability of Chiffchaffs to adapt to local disturbances related to human activities. Overall, our results provide a scenario of incipient differentiation of the Canary Islands Chiffchaff and, importantly, underscore once more the role of Gran Canaria in driving speciation processes in this archipelago.
  • Publication
    Habitat segregation by breeding origin in the declining populations of European Robins wintering in southern Iberia
    (Wiley, 2018-04) Hera Fernández, Iván de la; Fandos Guzmán, Guillermo; Fernández López, Javier; Onrubia, Alejandro; Pérez Rodríguez, Antón David; Pérez Tris, Javier; Tellería Jorge, José Luis
    Mediterranean woodlands and associated shrub formations of southern Iberia are key habitats for conservation of migratory birds. In some bird species, migratory and sedentary conspecifics meet in these areas during winter, but our understanding of how each population group is distributed over available habitats and the factors that determine their spatial organization are still unclear. This seriously limits our ability to assess their vulnerability to ongoing environmental changes affecting wintering habitats in this region. We used hydrogen isotopic signatures of feathers (dDf) to shed light on the habitat distribution of seasonally sympatric European Robin Erithacus rubecula populations wintering in Campo de Gibraltar that are currently facing a drastic decline. In contrast to previous studies that used morphological methods to distinguish the migratory behaviour of wintering Robins in this area, our isotopic approach revealed that sedentary Robins were not outcompeted upon the arrival of migrants and remained in the woodlands where they reproduce, which agrees with results obtained in other regions. Interestingly, we also found that migratory Robins with a closer breeding origin (higher dDf values) had a higher probability of occupying woodlands than did migrants coming from further away. Overall, our results suggest that the role of breeding origin in shaping the distribution of Robins during winter in Campo de Gibraltar is more relevant than the effects of sex, age or body size, which might facilitate the evolution of local adaptations for the exploitation of each habitat type.
  • Publication
    Stable isotope analysis reveals biases in the performance of a morphological method to distinguish the migratory behaviour of European Robins Erithacus Rubecula
    (Sociedad Española de Ornitología (SEO/BirdLife), 2017-07) Hera Fernández, Iván de la; Fandos Guzmán, Guillermo; Fernández López, Javier; Onrubia, Alejandro; Pérez-Rodríguez, Antón; Pérez Tris, Javier; Tellería Jorge, José Luis
    Morphological methods to distinguish between avian groups of research interest (e.g. differentsexes, populations or cryptic species) need to be externally validated to ensure reliable performance across situations. In this study, we used stable hydrogen isotope ratios of feathers (δ2 Hf ) to test the validity of morphological classification functions (MCFs) previously designed to assess the migratory behaviour of European Robins Erithacus rubecula wintering in southern Iberia. Our results show that a great number of migrants (mostly females and juveniles) were erroneously assigned as sedentary, which could compromise the reliability of previous ecological studies that made use of these MCFs. The development of improved MCFs or the use of alternative differentiation methods (δ2 Hf ) could help us to gain a more realistic insight into the habitat distribution and ecological interactions of sympatric migratory and sedentary robins overwintering in southern Iberia.
  • Publication
    Programa piloto de uso del portafolio como herramienta docente en el Grado de Biología
    (2020-05-11) Delgado Sáez, Juan Antonio; Jiménez Escobar, María Dolores; Pias Couso, María Beatriz; Herrero De Jáuregui, Cristina; Pérez Tris, Javier; Sánchez Jiménez, Abel; González Martín, Antonio; Saura Álvarez, María; Rodríguez Sousa, Antonio Alberto; Pardos Martínez, Fernando; Sánchez De Dios, Rut; Gutiérrez López, Mónica; Schmitz García, María Fe; Ramírez García, Álvaro; Vergara Carretero, Susana; Pulido Delgado, Francisco; Santos Martínez, Tomas; Acosta Gallo, Belén; Panetsos Petrova, Fivos; Arriero Higueras, Elena; Almodovar Pérez, Ana María; López De Pablo, Carlos Tomas; Alonso Campos, Germán; Miguel Garcinuño, José Manuel De; Gabriel Y Galán Moris, José María; Hernández Pazmiño, Nathalia
    Memoria final del proyecto de Innovación educativa "Programa piloto de uso del portafolio como herramienta docente en el Grado de Biología"
  • Publication
    A novel group of avian astroviruses from Neotropical passerine birds broaden the diversity and host range of Astroviridae
    (Nature Research, 2019-07-02) Fernández-Correa, Izaskun; Truchado, Daniel A.; Gómez-Lucía Duato, Esperanza; Doménech, Ana; Pérez Tris, Javier; Schmidt-Chanasit, Jonas; Cadar, Daniel; Benítez Rico, Laura
    Metagenomics is helping to expand the known diversity of viruses, especially of those with poorly studied hosts in remote areas. The Neotropical region harbors a considerable diversity of avian species that may play a role as both host and short-distance vectors of unknown viruses. Viral metagenomics of cloacal swabs from 50 Neotropical birds collected in French Guiana revealed the presence of four complete astrovirus genomes. They constitute an early diverging novel monophyletic clade within the Avastrovirus phylogeny, representing a putative new astrovirus species (provisionally designated as Avastrovirus 5) according to the International Committee on Taxonomy of Viruses (ICTV) classifcation criteria. Their genomic organization shares some characteristics with Avastrovirus but also with Mamastrovirus. The pan-astrovirus RT-PCR analysis of the cloacal samples of 406 wild Neotropical birds showed a community-level prevalence of 4.9% (5.1% in passerines, the highest described so far in this order of birds). By screening birds of a remote region, we expanded the known host range of astroviruses to the avian families Cardinalidae, Conopophagidae, Furnariidae, Thamnophilidae, Turdidae and Tyrannidae. Our results provide important frst insights into the unexplored viral communities, the ecology, epidemiology and features of host-pathogen interactions that shape the evolution of avastroviruses in a remote Neotropical rainforest.
  • Publication
    Evolution of seasonal transmission patterns in avian blood-borne parasites
    (Elsevier, 2015-08) Pérez Rodríguez, Antón David; Hera Fernández, Iván de la; Bensch, Staffan; Pérez Tris, Javier
    In temperate regions, many vector-borne parasites maximise their transmission prospects by adjusting reproduction to seasonal cycles of host susceptibility and vector availability. Nevertheless, in these regions there are areas where environmental conditions are favourable throughout the year, so that parasites could benefit from a year-round transmission strategy. We analysed how different transmission strategies (strict summer transmission, extended summer transmission – including spring and autumn, and year round transmission) have evolved among the different genetic lineages of Haemoproteus parabelopolskyi, an avian blood-borne parasite shared by three sibling species of passerine hosts. Our results indicate that the ancestral state of this clade of parasites had a strict summer transmission with the blackcap (Sylvia atricapilla) as the host. Other transmission strategies and switches to the other host species (Sylvia abyssinica and Sylviaborin) evolved recently, several times, independently. This suggests that, although year-round transmission is ecologically successful at present, seasonal transmission may have become more stable over evolutionary time. Switches from strict summer to an extended or year-round transmission strategy could have ecological consequences, if they promote the spread of parasites into more distant regions, transported by the migrating bird hosts. Therefore, a deeper knowledge of how different parasite transmission strategies are structured among birds in temperate areas is essential for understanding how disease emergence risks may develop in the future.
  • Publication
    The biological background of a recurrently emerging infectious disease: prevalence, diversity and host specificity of Avipoxvirus in wild Neotropical birds
    (Wiley Online Library, 2017) Moens, Michaël André Jean; Pérez Tris, Javier; Milá, Borja; Benitez Rico, Laura
    Understanding which factors promote disease emergence and transmission remains a major challenge of epidemiology. A problem with research on emerging diseases is that we seldom know to what extent pathogens circulate in natural popula-tions before emergence is already occurring. Moreover, it is critical to determine which pathogen characteristics are key to predict their emergence and invasion potential. We examined the prevalence, host specificity and evolutionary relationships of Avipoxvirus causing skin lesions in birds in two megadiverse and unexplored geographical regions of South America: an elevational gradient in the south Ecuadorian Andes, and a lowland Amazon rainforest in French Guiana. Next, we analyzed the host specificity and distribution of the worldwide Avipoxvirus diversity in order to understand their invasion potential. In French Guiana Avipoxvirus prevalence was 0% (n  889, 94 bird species). In Ecuador, prevalence was 0.3% (n  941, 132 bird species), with cases spanning the range of elevations between 1500 and 2500 m. ese were caused by two newly described strains, one of which belonged to an American clade of Avipoxvirus shared by different bird families, and another one closely related to a strain recovered from a different family of birds in Madeira. An analysis of the host specificity and geographic distribution of all Avipoxvirus strains known worldwide finds that these viruses are usually host generalists (particularly those in the fowlpox clade), and that many closely related strains are found on multiple continents. Our study at the community level suggests that distantly related Avipoxvirus strains circulate at very low prevalence in continental tropical South America. Avipoxvirus assemblages are composed of generalist strains with different ancestry and widespread distribution, a combination of characteristics which may make these typically scarce viruses perfect candidates to emerge under favorable ecological conditions.
  • Publication
    Host Specialization and Dispersal in Avian Haemosporidians
    (Springer Nature, 2020-10-20) Lima, Marcos Robalinho; Pérez Tris, Javier
    In order to be able to understand the ecological and evolutionary processes involved in the emergence of infectious diseases, one needs to comprehend how parasites arrive at new geographical areas and how they manage to maintain viable populations and even expand their ranges. We discuss host specificity in avian haemosporidians and how encounter and compatibility filters affect the dispersal of avian haemosporidians, and how these filters affect avian haemosporidian assemblages at different spatial and evolutionary scales. There are at least three important barriers to the dispersal of avian haemosporidians: (i) geographic barriers, (ii) environmental barriers, and (iii) interspecies barriers. In this chapter, we discuss the factors involved in these barriers and their effects on the structure of avian haemosporidian assemblages. Host specificity plays an important role in parasite dispersal, and in the case of avian haemosporidians that are vector-borne parasites, it needs to be evaluated both at the vector and bird host levels. Understanding the effects of these factors on host–vector–parasite dynamics is important to unravel the dispersal and diversification mechanisms of avian haemosporidians. We end this chapter reviewing host specialization in avian haemosporidians of tropical regions, discussing the mechanisms involved in the dispersal and specialization of these parasites and point out important research gaps that need attention.
  • Publication
    Adventitious feather replacement favours amore rapid regeneration of primaries over rectrices in two passerine bird species
    (Wiley, 2015-10) Hera Fernández, Iván de la; Pérez Tris, Javier; Tellería Jorge, José Luis
    There is increasing evidence of adaptive preferential investment during moult in those feather tracts that are more advantageous for fitness. In this study, we assessed whether, after the manual removal of two functionally different flight feathers (one primary and one rectrix), birds from two common passerine species (Eurasian Blackcap Sylvia atricapillaand European Robin Erithacus rubecula) favoured the regeneration of primary (supposedly the most functionally important feathers) over rectrix feathers. Our results did not show differences between replaced primary and rectrix feathers in their final length, but demonstrated that the gap left by the loss of the primary feather was filled earlier, suggesting that a rapid repair of the most essential feather tracts is also evolutionarily advantageous during the adventitious replacement of plumage.