Carlos A. Martín

Carlos A. Martín
Complutense University of Madrid | UCM · Department of Biodiversity, Ecology and Evolution

About

55
Publications
14,569
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1,794
Citations
Citations since 2017
7 Research Items
702 Citations
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2017201820192020202120222023050100150
2017201820192020202120222023050100150
2017201820192020202120222023050100150
Introduction
Carlos A. Martín currently works at the Department of Biodiversity, Ecology and Evolution, Complutense University of Madrid. Carlos does research in Zoology and Ecology. Their most recent publication is 'Changes in bird migration patterns associated with human-induced mortality'.

Publications

Publications (55)
Article
1. We investigated the causes of natal dispersal in four Spanish areas where 35 breeding groups of the polygynous great bustard Otis tarda were monitored intensively. A total of 392 juveniles were radio-tracked between 1991 and 2006 by ground and via aeroplane to avoid potential biases derived from the non-detection of long-distance dispersers. 2....
Article
Estudiamos el uso y las preferencias de hábitat de la ganga ibérica Pterocles alchata en el centro de España. Mediante radio-seguimiento caracterizamos el uso y selección de hábitat a lo largo de un ciclo anual, e investigamos las variaciones estacionales. Las gangas seleccionaron campos labrados durante todo el año, excepto en invierno, cuando pre...
Article
Positive interactions between species can have important conservation implications, especially when the species associating are both vulnerable. We studied the habitat use of pin-tailed sandgrouses Pterocles alchata and their association with another vulnerable species, the little bustard Tetrax tetrax in agrarian pseudo-steppes of central Spain us...
Article
Many bird populations have recently changed their migratory behaviour in response to alterations of the environment. We used 16-year data of the partial migratory great bustard (Otis tarda) males, including population counts and 180 lifelong radio-tracked individuals, to test for differences in survival rates between migratory and sedentary individ...
Article
Understanding spatiotemporal variations of movements and habitat selection by animals living in changing, heterogeneous environments under increasing human pressure is crucial for biodiversity conservation. We report here on shifts in habitat selection and movements during the breeding and non-breeding periods in a vulnerable and specialist bird, t...
Article
Full-text available
The conservation of carnivores (order Carnivora) can lead to the conservation of other species as well as entire ecosystems since they play an important ecosystemic role. However, their predatory behaviour has caused many of these species to experience marked population declines worldwide and they may therefore face greater anthropogenic threats th...
Poster
Full-text available
During a decade (2011-2020), GREFA (Group for the Rehabilitation of Native Fauna) collected data derived from the GPS tracking of 48 red kites (Milvus milvus, Linnaeus, 1758) in the center of the Iberian Peninsula. Within that sample we found 20 individuals that were rehabilitated in the wildlife hospital of the same organization, and that were rel...
Article
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Many species of the family Picidae, such as the woodpeckers, excavate the tree-cavities where they nest. Frequently the cavities are used during a single breeding season and subsequently abandoned, which allows their use by non-excavator species for nesting or roosting. Here we analyze the role of woodpeckers as providers of nesting and refuge plac...
Article
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Building trust in science and evidence-based decision-making depends heavily on the credibility of studies and their findings. Researchers employ many different study designs that vary in their risk of bias to evaluate the true effect of interventions or impacts. Here, we empirically quantify, on a large scale, the prevalence of different study des...
Article
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The European turtle dove (Streptopelia turtur) is classified as vulnerable by the IUCN. In this context, it is important to explore the factors affecting its abundance and the ways in which it can be effectively managed for conservation. This study compares the distribution of this dove in Spain and Morocco. These countries, which are separated by...
Article
Survival and the underlying causes of mortality are key demographic parameters for understanding animal population dynamics and identifying conservation needs. Here we use a large data set of tagged wild pin-tailed sandgrouse (Pterocles alchata) to examine the influence of individual traits (age, sex, size, movements and reproduction), and of tempo...
Article
Capturing and marking free-living birds permits the study of important aspects of their biology but may have undesirable effects. Bird welfare should be a primary concern, so it is necessary to evaluate and minimize any adverse effects of procedures used. We assess short-term effects associated with the capture, handling and tagging with backpack-m...
Article
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Predictive species' distribution models may answer ecological questions about habitat selection, co-occurrence of species and competition between them. We studied the habitat preferences and segregation of two sympatric species of de-clining sandgrouse, the black-bellied sandgrouse (Pterocles orientalis) and the pin-tailed sandgrouse (Pterocles alc...
Article
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We update and present relevant information regarding the abundance and distribution of the great bustard Otis tarda in Castilla y León (Spain) in 2008, compare it with previous census results, and analyse the effects of agricultural changes on the provincial abundance and distribution of the species. The study area was surveyed from four-wheel driv...
Article
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Collision with electric power lines is a conservation problem for many bird species. Although the implementation of flight diverters is rapidly increasing, few well-designed studies supporting the effectiveness of this costly conservation measure have been published. We provide information on the largest worldwide marking experiment to date, includ...
Article
We modelled great bustard abundance patterns and their spatial structure in relation to habitat and landscape variables. We developed Generalized Linear Models (GLM) using long term data series – years 1997–2006 – during the breeding season in Madrid region, central Spain. Our main goal was to assess spatial and temporal variability effects on habi...
Article
A detailed knowledge of the habitat requirements of steppe birds living in farmland habitats is necessary to identify agricultural practices compatible with their conservation. The globally threatened Great Bustard Otis tarda is a partial migrant in central Iberia, but factors affecting its winter habitat use have not been identified. We assessed h...
Article
Factors responsible for individual variation in partial migration patterns are poorly known, and identifying possible causes of these changes is essential for understanding the flexibility in migratory behavior. Analyzing 190 life histories of great bustards Otis tarda radio-tagged in central Spain, we investigated the changes in migratory tendency...
Article
Full-text available
We investigated the spatial arrangement of Great Bustard Otis tarda nests relative to leks in 55 females captured at four lek sites and radio-tracked through 1-6 years in a protected area in central Spain. Although females showed a tendency to nest close to the lek centers where they were observed during the mating season (29% did it at < 2 km), le...
Article
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The night-lighting technique is routinely used to catch birds. We improved this technique using a thermal infrared camera to catch steppe birds such as the sandgrouse. Target birds were located by an observer using the thermal camera, and approached and dazzled by another observer carrying a spotlight attached to a helmet and a hand-held net togeth...
Article
We studied the development of two sexual traits, whiskers and neck plumage, in relation to sexual selection in 41 free-living great bustard, Otis tarda, males radio-tracked at nine leks in central Spain in 1998–2001. During the pre-breeding male–male competition period (Feb.) prior to female arrival, number and length of whiskers correlated with we...
Article
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We examined how mating success varied in relation to age, weight, body size, and display behavior among great bustard Otis tarda males. The estimated mating success was strongly skewed, with 45% of adult males being involved in copulation attempts and only 9.7% actually seen copulating successfully. Unlike most birds, body size continued increasing...
Article
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The effects of habitat loss and fragmentation on the genetic structure and variability of wild populations have received wide empirical support and theoretical formalization. By contrast, the effects of habitat quality seem largely underinvestigated, partly due to technical difficulties in properly assessing habitat quality. In this study, we combi...
Article
Great Bustards Otis tarda have expanded their habitat range from historical occupancy of natural steppes to arable farmland, where the species initially benefited from favourable feeding conditions. More recently, the species has suffered severe declines due partly to agricultural intensification. Nest losses and juvenile mortality are amongst the...
Article
Full-text available
Radio tracking of 142 males captured at 44 leks in Spain showed that partial migration of great bustard males in summer is a widespread behaviour in many Iberian populations, in contrast to their previously assumed sedentariness. A variable number of males migrated immediately after mating to summering areas with lower temperatures and human popula...
Article
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We investigated the effects of human activities on the behaviour of great bustards (Otis tarda) in a Special Protection Area in central Spain. We recorded 532 disturbances, at a rate of 0.93 disturbances per hour, a high value compared to other studies. Escape (flight/running) was observed more often than alert. Flight was more frequent than runnin...
Article
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The Great Bustard (Otis tarda) is one of the heaviest flying birds and the most sexually dimorphic living bird. Adult males weighed 2.48x more than females, and their linear measurements were 18-30% larger. Weight increased between the pre-breeding and breeding seasons by 16% in females and 20% in males. Sexual size dimorphism emerges very early in...
Article
We explored migration patterns in Great bustards (Otis tarda), a species that shows strong sexual selection and the most extreme sexual size dimorphism among birds. The aim was to explain differential migration, examining whether Great bustards fulfil the main predictions of bird migration theory hypotheses and sexual segregation theory hypotheses....
Article
Full-text available
We studied the genetic diversity of great bustards (Otis tarda) in Iberia and Morocco, the main stronghold of this globally endangered species. Samples were collected from 327 individuals covering most of the distribution range within the study area. Sequence variation in a 657 bp fragment of the mtDNA control region revealed 20 variable sites defi...
Article
We explored sex-biased mortality patterns in a species showing the most extreme sexual dimorphism among birds, the great bustard Otis tarda. Between 1991 and 2005 we studied juvenile and immature survival in a sample of 361 great bustards radio-tagged at two different populations in Spain, Villafáfila and Madrid. Mortality decreased with age, from...
Article
Full-text available
During a long-term study of individually marked, free-living male great bustards captured as chicks and radio-tracked through several years in Spain, we studied the development with age of two secondary sex traits, the moustachial feathers and the neck plumage pattern. Juvenile males acquired full adult plumage between their fourth and seventh year...
Article
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—The Great Bustard Otis tarda in Morocco: a re-evaluation of its status based on recent sur- vey results. Aims: Between 1999 and 2005 five spring censuses of the Great Bustard Otis tarda population in Morocco were carried out, one of which (2003) was finally discarded due to bad weather conditions. Some comple- mentary, partial counts in autumn 200...
Article
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—The Great Bustard Otis tarda in Andalusia, southern Spain: status, distribution and trends. Aims: Between 2001 and 2004 the first comprehensive census of Great Bustards Otis tarda was carried out in Andalusia, southern Spain. This region holds one of the most endangered populations of the Iberian Peninsula. The aims were to establish the locations...
Article
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Dispersing individuals can use conspecifics as indicators of habitat quality and aggregate at traditionally occupied sites, leaving other favourable patches unoccupied. Here we test the predictions of the conspecific-based habitat selection hypothesis on a Spanish great bustard (Otis tarda) metapopulation, currently fragmented due to recent human-i...
Article
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The traffic load near large cities may show dramatic cyclical changes induced by weekend tourism, and this could induce cyclical changes in the activity patterns of wildlife. We studied a 19-km-long section of a road that crossed a high-use raptor area near a large city in Spain. We observed 18 raptor species along this segment of the road, includi...
Article
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Between 1998 and 2002 we carried out five spring censuses of the Great Bustard population of Madrid region. The average count was 1148 individuals (337 males and 811 females) distributed in 13 leks. The species' distribution is highly fragmented, due to the presence of urban areas and infrastructures. Comparison with earlier censuses suggests that...
Article
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Individual display rates and attractiveness of 17 radio-tagged, free-living great bustard males in north-western Spain were studied in relation to the degree of development of secondary sex traits, body condition, and age. Variance in display rate was significantly explained by body condition and length of moustache feathers, and neck development a...
Article
The sections on Field characters, Habitat, Distribution, Population, Movements, Food, Social pattern and behaviour, Breeding, Plumage, Measurements, Weights, and Geographical variation have been updated and partially re-written. Two new sections have been created on Conservation and Survival. New information is given on age and timing of acquisitio...
Article
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We found significant sex differences in the mtDNA genetic structure and dispersal patterns of great bustards in a population of 11 breeding groups, "leks", in central Spain. The analysis of genetic distances showed that the female population was divided into three groups of leks separated by ca. 50 km, whereas male haplotypes were randomly distribu...
Article
Summary 1. Great bustards Otis tarda are globally endangered and 50% of the world population now occurs in agro-steppe habitats in Spain. An understanding of the relationship between land use and the species' habitat requirements is necessary to predict the consequences of land-use change on this declining species. 2. A 2-year study of great bustar...
Article
A sample of 22 radio-tagged male Great Bustards from central Iberian populations was studied from 1996 to 1998. All birds undertook seasonal movements to postbreeding areas located up to 167 km away from their leks. Departures from leks occurred between May and July, with most birds moving northeast to summering areas. Approximately 47% of the male...
Article
Full-text available
Adult Great Bustards Otis tarda are sexually dimorphic, males weighing more than twice as much as females. However, there is no practical way to distinguish sex in chicks by their morphology. In this paper we describe a discriminant function, Tail Length/Weight, which correctly sexed 98.2% of 165 Great Bustard chicks at two study areas in Spain, th...
Article
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Desde hace más de diez años nuestro equipo viene desarrollando un amplio proyec- to de investigación sobre la biología de la avutarda en España, en el que el marcaje individual con placas alares y emisores de radio ha sido el método de estudio funda- mental. Hasta la fecha se han marcado en diferentes poblaciones españolas más de 500 avutardas, una...

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Archived project
El presente proyecto pretende analizar la comunidad de parásitos intestinales y el grado de parasitación en aves amenazadas de medios agrícolas, especies que en general se encuentran en declive, y las posibles implicaciones para su conservación.