10 Works

Data from: Signatures of natural selection between life cycle stages separated by metamorphosis in European eel

Jose Martin Pujolar, Magnus W. Jacobsen, Dorte Bekkevold, Javier Lobón-Cervia, Bjarni Jónsson, Louis Bernatchez & Michael M. Hansen
Background: Species showing complex life cycles provide excellent opportunities to study the genetic associations between life cycle stages, as selective pressures may differ before and after metamorphosis. The European eel presents a complex life cycle with two metamorphoses, a first metamorphosis from larvae into glass eels (juvenile stage) and a second metamorphosis into silver eels (adult stage). We tested the hypothesis that different genes and gene pathways will be under selection at different life stages...

Data from: Congruent phylogenetic and fossil signatures of mammalian diversification dynamics driven by tertiary abiotic change

Juan López Cantalapiedra, Manuel Hernández Fernández, Beatriz Azanza & Jorge Morales
Computational methods for estimating diversification rates from extant species phylogenetic trees have become abundant in evolutionary research. However, little evidence exists about how their outcome compares to a complementary and direct source of information: the fossil record. Furthermore, there is virtually no direct test for the congruence of evolutionary rates based on these two sources. This task is only achievable in clades with both a well-known fossil record and a complete phylogenetic tree. Here, we...

Data from: Phylogeography, historical demography, and habitat suitability modelling of freshwater fishes inhabiting seasonally fluctuating Mediterranean river systems: a case study using the Iberian cyprinid Squalius valentinus

Silvia Perea & Ignacio Doadrio
The Mediterranean freshwater fish fauna has evolved under constraints imposed by the seasonal weather/hydrological patterns that define the Mediterranean climate. These conditions have influenced the genetic and demographic structure of aquatic communities since their origins in the Mid-Pliocene. Freshwater species in Mediterranean-type climates will likely constitute genetically well-differentiated populations, to varying extents depending on basin size, as a consequence of fragmentation resulting from drought/flood cycles. We developed an integrative framework to study the spatial patterns...

Data from: Context-dependent effects of yolk androgens on nestling growth and immune function in a multibrooded passerine

Jaime Muriel, Pablo Salmón, Angel Nunez-Buiza, Felipe De Salas, Lorenzo Pérez-Rodríguez, Marisa Puerta & Diego Gil
Female birds may adjust their offspring phenotype to the specific requirements of the environment by differential allocation of physiologically active substances into yolks, such as androgens. Yolk androgens have been shown to accelerate embryonic development, growth rate and competitive ability of nestlings, but they can also entail immunological costs. The balance between costs and benefits of androgen allocation is expected to depend on nestling environment. We tested this hypothesis in a multibrooded passerine, the spotless...

Data from: A new titanosaurian braincase from the Cretaceous “Lo Hueco” locality in Spain sheds light on neuroanatomical evolution within Titanosauria

Fabien Knoll, Lawrence M. Witmer, Ryan C. Ridgely, Francisco Ortega & Jose Luis Sanz
Despite continuous improvements, our knowledge of the neurocranial anatomy of sauropod dinosaurs as a whole is still poor, which is especially true for titanosaurians even though their postcranial remains are common in many Upper Cretaceous sites worldwide. Here we describe a braincase from the uppermost Cretaceous locality of ‘‘Lo Hueco” in Spain that is one of the most complete titanosaurian braincases found so far in Europe. Although the titanosaurian Ampelosaurus sp. is known from the...

Data from: Speciation in mountain refugia: phylogeography and demographic history of the pine siskin and black-capped siskin complex

Sofía Alvarez, Jessie F. Salter, John E. McCormack & Borja Milá
Following Pleistocene glacial maxima, species that adapted to temperate climates in low-latitude refugia had to modify their ranges as climate changed, expanding either latitudinally towards the poles, or altitudinally to higher elevations in mountainous regions. Within just a few thousand years, populations taking alternative routes during interglacials became isolated from each other and subjected to different selection pressures, often leading to lineage divergence and speciation. The pine siskin Spinus pinus is a common and widespread...

Data from: Semi-permeable species boundaries in Iberian barbels (Barbus and Luciobarbus, Cyprinidae)

Hugo F. Gante, Ignacio Doadrio, Maria Judite Alves & Thomas E. Dowling
Background: The evolution of species boundaries and the relative impact of selection and gene flow on genomic divergence are best studied in populations and species pairs exhibiting various levels of divergence along the speciation continuum. We studied species boundaries in Iberian barbels, Barbus and Luciobarbus, a system of populations and species spanning a wide degree of genetic relatedness, as well as geographic distribution and range overlap. We jointly analyze multiple types of molecular markers and...

Data from: The influence of landscape configuration and environment on population genetic structure in a sedentary passerine: insights from loci located in different genomic regions

Esperanza S. Ferrer, Vicente García-Navas, Javier Bueno-Enciso, Rafael Barrientos, Eva Serrano-Davies, Conchi Cáliz-Campal, Juan J. Sanz & Joaquín Ortego
The study of the factors structuring genetic variation can help to infer the neutral and adaptive processes shaping the demographic and evolutionary trajectories of natural populations. Here, we analyse the role of isolation-by distance (IBD), isolation-by-resistance (IBR, defined by landscape composition), and isolation by environment (IBE, estimated as habitat and elevation dissimilarity) in structuring genetic variation of 25 blue tit (Cyanistes caeruleus) populations. We typed 1385 individuals at 26 microsatellite loci classified in two groups...

Data from: Untangling the evolutionary history of a highly polymorphic species: introgressive hybridization and high genetic structure in the desert cichlid fish Herichthys minckleyi

Isabel S. Magalhaes, Claudia Patricia Ornelas-García, Mariana Leal-Cardin, Tania Ramírez & Marta Barluenga
Understanding the origin of biodiversity requires knowledge on the evolutionary processes that drive divergence and speciation, as well as on the processes constraining it. Intraspecific polymorphisms can provide insight into the mechanisms that generate and maintain phenotypic, behavioural and life history diversification, and can help us understand not only the processes that lead to speciation but also the processes that prevent local fixation of morphs. The ‘desert cichlid’ Herichtys minckleyi is a highly polymorphic species...

Data from: Ageing and reproduction: antioxidant supplementation alleviates telomere loss in wild birds

Elisa P. Badas, Javier Martínez, Juan Rivero De Aguilar Cachafeiro, Francisco Miranda, Jordi Figuerola & Santiago Merino
Reproduction is inherently costly. Environmental stressors, such as infection and limited food resources, can compromise investment at each breeding attempt. For example, recent data on captive birds showed that increased reproductive effort accelerates ageing. However, the effects of nutritional status and infection on ageing remain unknown. Telomeres function as protective caps at the ends of eukaryotic chromosomes, and changes in telomere length is a commonly used proxy for ageing. To partially address the mechanisms of...

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