Papers by veronica cortes quesada
Scientific Reports, 2016
Fisheries provide an abundant and predictable food source for many pelagic seabirds through disca... more Fisheries provide an abundant and predictable food source for many pelagic seabirds through discards, but also pose a major threat to them through bycatch, threatening their populations worldwide. The reform of the European Common Fisheries Policy (CFP), which intends to ban discards through the landing obligation of all catches, may force seabirds to seek alternative food sources, such as baited hooks from longlines, increasing bycatch rates. To test this hypothesis we performed a combined analysis of seabird-fishery interactions using as a model Scopoli's shearwaters Calonectris diomedea in the Mediterranean. Tracking data showed that the probability of shearwaters attending longliners increased exponentially with a decreasing density of trawlers. On-board observations and mortality events corroborated this result: the probability of birds attending longliners increased 4% per each trawler leaving the longliner proximity and bird mortality increased tenfold when trawlers were not operating. Therefore, the implementation of the landing obligation in EU waters will likely cause a substantial increase in bycatch rates in longliners, at least in the short-term, due to birds switching from trawlers to longliners. Thus the implementation of the landing obligation must be carefully monitored and counterbalanced with an urgent implementation of bycatch mitigation measures in the longline fleet.
Krankenpflege Soins Infirmiers, 2009
Krankenpflege Soins Infirmiers, 2009
Revista De Anillamiento, 2006
Uno de los ámbitos de mayor interés en el campo de la química analítica es el análisis medioambie... more Uno de los ámbitos de mayor interés en el campo de la química analítica es el análisis medioambiental, ya que hay que asegurar y mantener la calidad, ya sea del aire o del agua para que su composición no comporte ningún peligro para la salud de los seres vivos. ...
Ciencia Saude Coletiva, Oct 1, 2013
Krankenpflege Soins Infirmiers, 2011
Educere, Mar 1, 2006
Page 1. Fecha de recepción 13-10-05 Fecha de aceptación 08-11-05 Resumen Abstract Para evaluar el... more Page 1. Fecha de recepción 13-10-05 Fecha de aceptación 08-11-05 Resumen Abstract Para evaluar el efecto del Programa de Orientación Vocacional aplicado a estudiantes de nuevo ingreso del Centro de Bachillerato Tecnológico ...
Krankenpflege. Soins infirmiers, 2009
Krankenpflege. Soins infirmiers, 2009
Krankenpflege. Soins infirmiers, 2011
Ciência & Saúde Coletiva, 2013
PLoS ONE, 2014
Understanding why host species differ so much in symbiont loads and how this depends on ecologica... more Understanding why host species differ so much in symbiont loads and how this depends on ecological host and symbiont traits is a major issue in the ecology of symbiosis. A first step in this inquiry is to know whether observed differences among host species are species-specific traits or more related with host-symbiont environmental conditions. Here we analysed the repeatability (R) of the intensity and the prevalence of feather mites to partition within-and among-host species variance components. We compiled the largest dataset so far available: 119 Paleartic passerine bird species, 75,944 individual birds, ca. 1.8 million mites, seven countries, 23 study years. Several analyses and approaches were made to estimate R and adjusted repeatability (R adj ) after controlling for potential confounding factors (breeding period, weather, habitat, spatial autocorrelation and researcher identity). The prevalence of feather mites was moderately repeatable (R = 0.26-0.53; R adj = 0.32-0.57); smaller values were found for intensity (R = 0.19-0.30; R adj = 0.18-0.30). These moderate repeatabilities show that prevalence and intensity of feather mites differ among species, but also that the high variation within species leads to considerable overlap among bird species. Differences in the prevalence and intensity of feather mites within bird species were small among habitats, suggesting that local factors are playing a secondary role. However, effects of local climatic conditions were partially observed for intensity.
Journal of Avian Biology, 2012
Feather mites are arthropods that live on or in the feathers on birds, and are among the commones... more Feather mites are arthropods that live on or in the feathers on birds, and are among the commonest avian ectosymbionts. However, the nature of the ecological interaction between feather mites and birds remains unclear, some studies reporting negative effects of feather mites on their hosts and others reporting positive or no effects. Here we use a large dataset comprising 20 189 measurements taken from 83 species of birds collected during 22 yr in 151 localities from seven countries in Europe and North Africa to explore the correlation between feather mite abundance and body condition of their hosts. We predicted that, if wing-dwelling feather mites are parasites, a negative correlation with host body condition should be found, while a mutualistic interaction should yield positive correlation. Although negative relationships between feather mite abundance and host body condition were found in a few species of birds, the sign of the correlation was positive in most bird species (69%). e overall effect size was only slightly positive (r 0.066). e effect of feather mite abundance explained 10% of variance in body condition in most species (87%). Results suggest that feather mites are not parasites of birds, but rather that they hold a commensalistic relationship where feather mites may benefit from feeding on uropygial gland secretions of their hosts and birds do not seem to obtain a great benefit from the presence of feather mites.
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Papers by veronica cortes quesada