Person:
Santos Martínez, Tomás

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First Name
Tomás
Last Name
Santos Martínez
URI
https://hdl.handle.net/20.500.14352/81651
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Biológicas
Department
Biodiversidad, Ecología y Evolución
Area
Zoología
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2014 - 20193
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Author: Pérez Tris, Javier × Item Type: Publication ×

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Now showing 1 - 3 of 3
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    The importance of northern Spanish farmland for wintering migratory passerines: a quantitative assessment
    (Bird Conservation International, 2014) Santos Martínez, Tomás; Carbonell Alanís, Roberto; Galarza, Aitor; Pérez Tris, Javier; Ramírez García, Álvaro; Tellería Jorge, José Luis
    Migratory birds are critically dependent on adequate wintering habitats for their long-term survival. Cantabrian farmland, a mixed agricultural landscape extending across the coastal lowlands of northern Spain, constitutes an important wintering area for many short-distance migrants coming from central-western and northern Europe. Unfortunately, the Common Agricultural Policy of the European Union and national afforestation schemes have resulted in a massive replacement of farmland by pine Pinus spp. and eucalypt Eucalyptus sp. plantations. This work assesses the importance of Cantabrian farmland as wintering grounds for short-distance European migrants and for wintering species that originate in nearby woodlands. We examined the seasonal changes in passerine bird populations in the Cantabrian region and used winter ringing recoveries obtained in the area to evaluate the contribution made by European migrants to winter populations. Bird communities were surveyed along 299 500-m long transects distributed between 67 farmland patches, 67 lowland forests and 14 upland forests. Winter assemblages were more diverse and species more abundant in farmland than in lowland or upland forests, whereas these differences were smaller in the spring. Bird numbers in farmland tripled in winter, numbers increasing by about 6.9 million birds compared to breeding populations. Most of this increase was accounted for by species that also bred in the region and that considerably increased their abundance (65.6% of all wintering birds, with the Chaffinch Fringilla coelebs responsible for 31.4% of the total increase) and by five exclusively wintering species (34.4%, with the Meadow Pipit Anthus pratensis accounting for 25.2% of the total increase). The main bulk of this increase is caused by the influx of European migrants. The importance of halting the current spread of eucalypt plantations (which increased over 400% over the past 30 years) and of applying more effective agri-environment schemes to achieve appropriate farmland conservation is discussed.
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    Project number: 112
    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; Pérez Tris, Javier; Acebal Sanabria, Carmen; Jiménez Pinillos, Juan; Gil-Serna, Jéssica; Wrent, Petra; Gil de Prado, Elena; Rivas Fernández, Eva; García Rubio, Rocío; De La Mata Riesco, Mª Isabel
    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.
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    Increased individual homozygosity is correlated with low fitness in a fragmented lizard population
    (Biological Journal of the Linnean Society, 2019) Pérez Tris, Javier; Llanos Garrido, Alejandro; Bloor, Paul; Carbonell Alanís, Roberto; Tellería Jorge, José Luis; Santos Martínez, Tomás; Díaz González-Serrano, José Augusto
    Isolation owing to anthropogenic habitat fragmentation is expected to increase the homozygosity of individuals, which might reduce their fitness as a result of inbreeding depression. Using samples from a fragmented population of the lizard Psammodromus algirus, for which we had data about two correlates of fitness, we genotyped individuals for six microsatellite loci that correctly capture genome-wide individual homozygosity of these lizards (as validated with an independent sample of lizards genotyped for both these microsatellites and > 70 000 single nucleotide polymorphisms). Our data revealed genetic structure at a very small geographical scale, which was compatible with restricted gene flow among populations disconnected in a matrix of inhospitable habitat. Lizards from the same fragment were genetically more related to one another than expected by chance, and individual homozygosity was greater in small than in large fragments. Within fragments, individual homozygosity was negatively associated with adult body size and clutch mass, revealing a link among reduced gene flow, increased homozygosity and lowered fitness that might reduce population viability deterministically. Our results contribute to mounting evidence of the impact of the loss of genetic diversity on fragmented wild populations.