Álvaro Gaytán

Álvaro Gaytán
Stockholm University | SU · Department of Ecology, Environment and Plant Sciences

Doctor of Philosophy

About

18
Publications
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Introduction
I am assessing how climate change affects the voltinism of a diverse community of herbivores and parasitoids on oak and the consequences for food web structure and dynamics

Publications

Publications (18)
Article
Full-text available
Many plant species produce multiple leaf flushes during the growing season, which might have major consequences for within-plant variation in chemistry and species interactions. Yet, we lack a theoretical or empirical framework for how differences among leaf flushes might shape variation in damage by insects and diseases.  We assessed the impact o...
Article
Full-text available
Insect phenology consists of the timing of life events, as well as the number of generations (voltinism). While several studies have focused on the impact of climate on the timing of seasonal events, or the voltinism of single species, we have few insights into the factors that shape patterns of voltinism within ecological communities. Importantly,...
Article
Full-text available
Between 2009 and 2018, information was collected about spider communities in holm oak forests in the Spanish provinces of Cáceres and Toledo. As a result of the study, a list of 189 species is presented, of which Gonatium dayense Si- mon, 1884 is added to the European list. Simultaneously, the list of spiders known from the provinces of Cáceres and...
Article
Full-text available
Iberian man-made oak savannahs (so called dehesas) are traditional silvopastoral systems with a high natural value. Scattered trees provide shelter and additional food to livestock (cattle in our study sites), which also makes possible for animals depending on trees in a grass-dominated landscape to be present. We compared dehesas with nearby treel...
Article
Full-text available
Iberian oak savannahs are traditional silvopastoral systems in which acorns constitute a key food source for livestock. Acorn feeding insects provoke significant economic losses; however, the high natural value of Iberian oak savannahs precludes any chemical treatment. This paper shows a novel way of biological pest control based on promoting lives...
Article
Full-text available
The effects of climate change on oaks Quercus spp. constitute a main environmental concern for the conservation of temperate forests. In this context, we assessed the consequences of longer droughts on the interactions between the holm oak Quercus ilex L. and its main acorn pests. Infested acorns were prematurely abscised before reaching their pote...
Article
Premise: Abiotic factors and plant species traits have been shown to drive latitudinal gradients in herbivory, and yet, population-level factors have been largely overlooked within this context. One such factor is plant density, which may influence the strength of herbivory and may vary with latitude. Methods: We measured insect herbivory and co...
Article
Full-text available
DNA barcoding identification needs a good characterization of intraspecific genetic divergence to establish the limits between species. Yet, the number of barcodes per species is many times low and geographically restricted. A poor coverage of the species distribution range may hamper identification, especially when undersampled areas host genetica...
Article
Full-text available
Hoverflies are frequently used as biodiversity indicators and are targets of ecological studies across Europe. How hoverfly diversity responds to ecological variables is essential for species and habitat conservation. The present study is a first attempt to assess the hoverfly diversity of deciduous woodlands of Pyrenean oak (Quercus pyrenaica) in...
Article
Full-text available
Background and aims: Classic theory on geographical gradients in plant-herbivore interactions assumes that herbivore pressure and plant defences increase towards warmer and more stable climates found at lower latitudes. However, the generality of this trend has been recently called into question by conflicting empirical evidence. One possible expl...
Book
Full-text available
Hoja divulgadora en la que se ofrecen claves precisas para la identificación de las clases de orugas que pueden aparecer en las encinas de la dehesa, facilitando así la toma de decisiones en la gestión de este tipo de plagas. Las hojas divulgadoras combinan el rigor temático con la claridad expositiva, configurándose como un modelo en la gestión de...
Article
Full-text available
La aplicación de las nuevas Tecnologías de la Información y la Comunicación (TICs) está revolucionando el sector agropecuario; en este artículo mostramos cómo pueden contribuir a desarrollar una “ganadería de precisión” en las dehesas de porcino. La bellota es imprescindible para la producción de una carne de calidad, y su baja disponibilidad y/o a...
Article
Full-text available
Agrotis garretasorum Blázquez, Garretas & Gaytán, 2018 sp. n. , a new species of Agrotis Ochsenheimer, 1816 from the province of Cáceres (Spain) is illustrated and described, based on external and internal morphology as well as molecular data from the mitochondrial cytochrome oxidase subunit I gene (COI) 658 bp
Article
Full-text available
Insect herbivory decreases plant fitness by constraining plant growth, survival and reproductive output. Most studies on the effects of herbivory in trees rely on correlational inter-individual comparisons and could thus be affected by confounding factors linked to both herbivory and plant performance. Using the Mediterranean Holm oak (Quercus ilex...
Conference Paper
Full-text available
Las orugas de lepidópteros heteróceros son los defoliadores más importantes de las encinas Quercus ilex de las dehesas. Conocer su biología y las interacciones que establecen con otros organismos es clave para saber qué papel juegan en estos sistemas agroforestales y plantear medidas de control de sus poblaciones. Este trabajo analiza si, como ocur...
Conference Paper
Full-text available
Las dehesas son un sistema agroforestal tradicional que combina pastos con arbolado (principalmente encinas Quercus ilex y alcornoques Quercus suber) y que ocupa cientos de miles de hectáreas en la Península Ibérica. Las orugas de varias especies de lepidópteros se alimentan de las hojas de encina y pueden causar defoliaciones intensas, las cuales...

Questions

Questions (3)
Question
I would like to be able to detect parasitoids in lepidopteran larvae. Mostly targeting species from Eulophidae family.
Question
Dear all,
I would like to know if is possible to run a model with a categorical response variable plus some categorical predictors (and its interactions) and a random factor in R?
If yes, any advice (i.e. R-packages)?
Thank you...
Question
I would like to know if the content of a group of lepidopteran caterpillars could be sequenced trying to identify only the parasitoids they contain (endo- and exo-). Maybe there are some specific primers for hymenopterans that avoid amplifying the lepidopteran tissue? Any suggestions?
Thanks in advance,
Alvaro

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Projects

Projects (2)
Project
Plants interact with a large diversity of organisms, including insects and microorganisms. These species interactions are strongly influenced by climate, as illustrated by the advances in plant and insect phenology in response to increasing temperatures. Beyond changes in phenology, climate might also affect the number of times certain events take place during the same year, such as the number of leaf flushes of plants and the number of generations of insects (voltinism). In this project, we investigated the impact of the number of leaf flushes and insect voltinism on the oak food web. We focussed on the pedunculate oak Quercus robur and the community of herbivores and fungi that share oaks as a common resource. In the first half of this project, we looked into the impact of the co-existence of multiple leaf flushes on plant chemistry, insect attack, pathogen infection and the structure of the foliar fungal community along the distributional range of oaks in Europe. In the second half of this project, we examined the impact of temperature and species traits on the voltinism of the oak-associated herbivore community, as well as the joint impact of plant spring phenology and pathogen infection on the preference and performance of multigenerational attackers during the growing season.
Project
The project has 4 major objectives Objective 1- Assessment of the relationship between livestock presence, pest abundance and damages Objective 2- Investigating the mechanisms ruling the interactions between livestock and pests Objective 3.- Development of large spatial-scale online computational model predicting defoliation and infestation ratios in production dehesas. Objective 4: Development of a grazing scheme (intensity/calendar) to mitigate the consequences of oak pests