Santiago Guallar


I fell in love with Neotropical passerines more than a decade ago. I focused my interest on their annual cycle and more particularly their molt strategies.


arbolunitarioPhD Thesis
I aim at reconstructing the evolution of moult strategies and unravelling the factors that influence molt pattern formation and variation in passerines. The approach involves unsupervised methods to reveal patterns and phylogenetic analyses to reconstruct trait evolution throughout the tree of this order.



IMG_1873CV |Education 

1992-1996. BSc Biology Universitat de Barcelona. 2011-2012. MSc Statistical Modeling. Universitat Autònoma de Barcelona




1998-today Active passerine bander
2001-2005 Field work in the US and Mexico
2006-2010 Catalan Winter Bird Atlas coordinator




Books and book chapters


    • Jané E, Guallar S & Bonney T 2014. Mirando Aves en Nicaragua. Hispamer.

    • Herrando S, Brotons L, Estrada J, Guallar S & Anton M (eds.) 2011. Atles dels ocells de Catalunya a l’hivern 2006-2009. ICO/Lynx Edicions, Barcelona.

    • Guallar S, Santana E, Contreras S, Verdugo H & Gallés A 2009. Paseriformes del Occidente de México: morfometría, datación y sexado. Museu Natural de Ciències, Barcelona.

Reviews by: 1) Pyle P 2011. Revista Catalana d’Ornitologia 27, L’Abellerol 42, and Western Birds 42; 2) Schondube J 2011. Ibis 153; 3) Milà B 2012. Ardeola 59.


      • Herrando S, Brotons L, Guallar S, Villero D, Arcos JM, Bécares J, Anton M & Bota G 2011.

Species accounts

      • Baltà O & Guallar S 2011. Merla roquera Monticola saxatilis.
      • Guallar S 2011. Raspinell pirinenc Certhia familiaris. Bec de corall cuanegra Estrilda troglodytes. Bec de corall de galta toronja Estrilda melpoda.
      • Guallar S & Bros V 2011. Picot verd Picus viridis.
      • Guallar S & Pàramo F 2011. Colltort Jynx torquilla.
      • Guallar S & Sanmartí R 2011. Raspinell comú Certhia brachydactyla.
      • Guallar S, Comas A & Clarabuch O 2011. Remena-rocs Arenaria interpres.
      • Guallar S, Larruy X & Arcos JM 2011. Calàbria grossa Gavia immer.
      • Guallar S, Rodríguez M & Trabalon F 2011. Oca egípcia Alopochen aegyptiaca.
      • Senar JC & Guallar S 2011. Lluer Carduelis spinus.
      • Guallar-Rivero S 2004. Ballester Apus melba. Pp 216-217 in Estrada J, Pedrocchi V, Herrando S & Brotons L (eds) 2004. Atles dels Ocells Nidificants de Catalunya 1999-2002. ICO-Lynx Edicions, Barcelona.



SCI journals


  • Soriano-Redondo A, Cortés, V, Reyes-González, Guallar S, Arcos JM, Bécares J, Rodríguez B & González-Solís J (in prep). Seabird by-catch risk is mediated by interactions among fisheries.

  • Guallar S & Gallés A (submitted to Ornitología Neotropical). Age determination of White-eared Hummingbird (Hylocharis leucotis) and Amethyst-throated Mountaingem (Lampornis amethystinus).

  • Guallar S & Figuerola J 2016. Factors influencing the evolution of moult in the non-breeding season: insights from the family Motacillidae. Biological Journal of the Linnean Society 117.

  • Guallar S, Ruiz-Sánchez A, Rueda-Hernández R & Pyle P 2016. Molt strategies of 10 neotropical forest passerines. Wilson Journal of Ornithology 128.

  • Guallar S, Ruiz A, Rueda R & Pyle P 2014. Moult topography and its application to the study of partial wing-moult in two Neotropical wrens. Ibis 156: 311-320.

  • Quesada J, Guallar S, Pérez N, Estrada J & Herrando S 2010. Observer error associated with band allocation is negligible in large scale monitoring schemes; but how precise is the use of bands at all? Ardeola 57: 23-32.

  • Herrando S, Brotons L, Guallar S & Quesada J 2010. Assessing regional variation in conservation value using fine-grained bird atlases. Biodiversity & Conservation 19: 867-881.

  • Herrando S, Brotons L, Pons P, Guallar S & Sales S 2009. Postfire forest management and Mediterranean birds: the importance of the logging remnants. Biodiversity & Conservation 18: 2153-2164.



Non-SCI journals


  • Guallar S 2015. El anillamiento: el método justifica los fines. Revista de Anillamiento 34: 40-47.

  • Ruiz A, Rueda R, Guallar S & Pyle, P 2012. Age determination of the spot-breasted wren and the white-breasted wood wren using preformative molt patterns. North American Bird Bander 37: 93-100.

  • Guallar S, Quesada J, Gargallo G, Herrando S & Romero JM 2010. Use of discriminant analysis in the sex determination of passerine breeding in the western Mediterranean. Revista Catalana d’Ornitologia 26: 38-50.

  • Guallar S 2007. Un método para cuantificar las contribuciones de los colaboradores en las publicaciones científicas. Animal Biodiversity and Conservation 30: 71-81.

  • Herrando S, Estrada J, Brotons L & Guallar S 2006. Estimation of the sampling effort per 10×10 UTM square during the Catalan Winter Bird Atlas 2006-2009. Revista Catalana d’Ornitologia 22: 21-26.

  • Herrando S, Estrada J, Brotons L & Guallar S 2006. Do common bird winter censuses produce similar results when conducted in the morning and in the afternoon? Revista Catalana d’Ornitologia 22: 14-20.

Popular science journals

  • Guallar S 2009. Novetats bibliogràfiques: Atlas of breeding birds in Bulgaria. Abellerol 37: 13.

  • Herrando S, Guallar S, Estrada J & Brotons L 2009. Atlas de las aves en invierno 2006-2009. El Portarró 25: 4-6.

  • Herrando S, Brotons L, Estrada J & Guallar S 2008. En Cataluña se ultima un atlas que indica cómo se distribuyen las aves durante el invierno. Quercus 274: 12.

  • Guallar S 2008. Novetats bibliogràfiques: Scaling in bird coloniality. Individual behaviour, spatial patterns and population dynamics. Abellerol 34: 14.

  • Guallar S 2005. Treballar com a ornitòleg a Amèrica. Abellerol 23: 3-5.

  • Guallar S 2002. Novetats bibliogràfiques: Identification Guide to North American Birds. Abellerol 15: 14.