Juan Antonio Calleja

ORCID: 0000-0002-6586-0939
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About
Contact & Profiles
Research Areas
  • Botany and Plant Ecology Studies
  • Mediterranean and Iberian flora and fauna
  • Bryophyte Studies and Records
  • Lichen and fungal ecology
  • Sesquiterpenes and Asteraceae Studies
  • Wildlife Ecology and Conservation
  • Ecology and Vegetation Dynamics Studies
  • Plant Diversity and Evolution
  • Plant Pathogens and Fungal Diseases
  • Genetic diversity and population structure
  • Species Distribution and Climate Change
  • Botany, Ecology, and Taxonomy Studies
  • Avian ecology and behavior
  • Mycorrhizal Fungi and Plant Interactions
  • Botanical Research and Chemistry
  • Bird parasitology and diseases
  • Animal Behavior and Reproduction
  • Rangeland and Wildlife Management
  • Ecology and biodiversity studies
  • Plant Taxonomy and Phylogenetics
  • Peatlands and Wetlands Ecology
  • Silymarin and Mushroom Poisoning
  • Plant Ecology and Taxonomy Studies
  • Plant Parasitism and Resistance
  • Animal Ecology and Behavior Studies

Universidad Autónoma de Madrid
2008-2025

Centre for Research on Ecology and Forestry Applications
2016-2023

Fundación Biodiversidad
2020-2021

Universitat Autònoma de Barcelona
2011-2019

Instituto Nacional de Neurología y Neurocirugía
2011

Universidad de Málaga
2000-2005

Abstract Bryophytes are a diverse group of organisms with unique properties, yet they severely underrepresented in plant trait databases. Building on the recently published European Red List bryophytes and previous compilations, we present Europe Traits (BET) data set, including biological traits such as those related to life history, growth habit, sexual vegetative reproduction; ecological indicator values, substrate habitat; bioclimatic variables based species' range. The set includes...

10.1111/jvs.13179 article EN cc-by Journal of Vegetation Science 2023-02-27

In 1842, J.D. Hooker collected a number of mosses on Hermite Island (Cape Horn region). From one those gatherings, 141, four species Ulota have been described: U. luteola, fuegiana, glabella, and eremitensis. The first two are widely accepted, whereas the identity latter has recently discussed, names now synonymized under more distributed in Tierra del Fuego archipelago. Our studies, based recent collections Orthotrichaceae from Patagonia, show that specimens different fuegiana agreeing with...

10.5852/ejt.2020.726.1177 article EN cc-by European Journal of Taxonomy 2020-12-03

Abstract Refugia are expected to preserve genetic variation of relict taxa, especially in polyploids, because high gene dosages could prevent erosion small isolated populations. However, other attributes linked polyploidy, such as asexual reproduction, may strongly limit the levels variability Here, ploidy and patterns at nuclear microsatellite loci were analysed P runus lusitanica , a polyploid species with clonal reproduction that is considered paradigmatic example T ertiary relict....

10.1111/mec.12194 article EN Molecular Ecology 2013-02-04

Colonization and diversification processes are responsible for the distinctiveness of island biotas, with Madagascar standing out as abiodiversity hotspot exceptionally rich in species endemism. Regardless its significance, evolutionary history drivers Madagascar's flora remain understudied. Here we focus on Helichrysum (Compositae, Gnaphalieae) to investigate biogeographic origins Malagasy flora. We inferred a highly resolved phylogeny based target-enrichment data from 327 (including 51 %...

10.1016/j.ympev.2024.108283 article EN cc-by-nc Molecular Phylogenetics and Evolution 2025-01-05

Herbaceous communities are vital for biodiversity in forests and scrublands. Herbivory influences their cover, richness, diversity. Overabundant herbivores disrupt these ecosystem processes. In recent decades, vast territories (e.g., North America, Europe) have experienced a remarkable increase deer (Cervidae) populations. However, few studies examined the effects of increasing ungulate densities different Mediterranean habitats.This study explores short-term impacts red overabundance on...

10.2139/ssrn.5090767 preprint EN 2025-01-01

<title>Abstract</title> Spatial ecological databases are crucial for understanding and managing biodiversity ecosystem services. The geoSABINA database provides spatially explicit datasets to support plant research conservation throughout mainland Spain. It integrates high-resolution spatial data of four main categories: (I) occurrence data, (II) environmental variables, (III) species distribution models, (IV) thematic maps management. dataset includes georeferenced records 81 tree 101 shrub...

10.21203/rs.3.rs-5928444/v1 preprint EN cc-by Research Square (Research Square) 2025-01-31

ABSTRACT Adaptation to different environments in geographically separated populations is key for allopatric speciation. Most research has focused on the effects of geographical isolation and abiotic factors, but disjunct frequently co‐occur with pools species, favouring divergent adaptation We show importance plant neighbourhood, compared geographic environmental speciation two closely related plants, Carex elata reuteriana . Both species share similar ecological requirements inhabit river...

10.1111/mec.17683 article EN Molecular Ecology 2025-02-14

Symbionts are key elements of ecosystems, by playing important roles in shaping the biology and ecology their hosts. However, factors determining symbiont loads across host species still unclear. Nowadays, we know that intensity prevalence feather mites, most diverse group avian ectosymbionts, differ strongly between species. To understand those differences, studied 17 bird traits two mite community features (species richness composition species) potentially related to interspecific...

10.1111/oik.10629 article EN cc-by Oikos 2025-02-17

Abstract Changes in land‐use and climate affect the distribution diversity of plant animal species at different spatiotemporal scales. The extent to which species‐specific phenotypic plasticity biotic interactions mediate organismal adaptation changing environments, however, remains poorly understood. Woody expansion is threatening alpine grasslands worldwide, evaluating predicting its effects on herbivores crucial importance. Here, we explore impact shrubification feeding efficiency...

10.1111/gcb.14587 article EN Global Change Biology 2019-02-09

The floras on the highest mountains in tropical eastern Africa are among most unique world. Despite exceptionally high concentration of endemic species, these remain understudied from an evolutionary point view. In this study, we focus Carduus-Cirsium group (subtribe Carduinae) to unravel relationships species Afromontane and Afroalpine floras, aiming improve systematics group. We applied Hyb-Seq approach using Compositae1061 probe set 190 samples (159 species), encompassing representatives...

10.3390/plants12173083 article EN cc-by Plants 2023-08-28

In alpine habitats, the seasonally marked climatic conditions generate seasonal and spatial differences in forage availability for herbivores. Vegetation quality during growing season are known to drive life history traits of mountain ungulates. However, little effort has been made understand association between plant phenology changes foraging strategies these dwellers. Furthermore, this link can be affected by presence livestock same meadows. The objective work was study diet composition...

10.1371/journal.pone.0210819 article EN cc-by PLoS ONE 2019-01-23

Abstract Aim To assess the importance of climate and human pressure as factors limiting past, present future distribution Prunus lusitanica L. (the Portuguese laurel), a relict Europe’s ancient subtropical laurel‐forest flora. Location The Iberian Peninsula. Methods A census was taken current populations P. in Peninsula threats they face. potential species modelled under climatic conditions simulations for Last Glacial Maximum (LGM), mid‐Holocene year 2080. Results total population 31,000...

10.1111/j.1365-2699.2008.01976.x article EN Journal of Biogeography 2008-09-15

Abstract Aim To investigate the ecophysiological traits allowing persistence of a subtropical relict tree ( Prunus lusitanica L.) under dry Mediterranean climate at eroding edge its range. Location A glasshouse for study controlled conditions and two marginal populations located in riparian forests central Spain exposed to summer drought, contrast that grow mountain cloud forests. Methods Two experiments were conducted assess tolerance abiotic found habitats. In experiment, gas‐exchange...

10.1111/j.1365-2699.2008.01898.x article EN Journal of Biogeography 2008-04-01

Understanding why host species differ so much in symbiont loads and how this depends on ecological traits is a major issue the ecology of symbiosis. A first step inquiry to know whether observed differences among are species-specific or more related with host-symbiont environmental conditions. Here we analysed repeatability (R) intensity prevalence feather mites partition within- among-host variance components. We compiled largest dataset far available: 119 Paleartic passerine bird species,...

10.1371/journal.pone.0107341 article EN cc-by PLoS ONE 2014-09-12

Mosses of the subfamily Orthotrichoideae represent one main components cryptogam epiphytic communities in temperate areas. During last two decades, this taxonomical group has undergone an extensive revision that led to its rearrangement at generic level. However, their phylogenetic relationships and inferences on evolutionary patterns have driven present diversity little advanced. In study, we a dated molecular reconstruction level, including 130 samples 12 genera currently recognized within...

10.3389/fpls.2021.629035 article EN cc-by Frontiers in Plant Science 2021-03-26
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