Sergio Pérez-Ortega

Sergio Pérez-Ortega
Spanish National Research Council | CSIC · Real Jardín Botanico de Madrid

About

151
Publications
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3,239
Citations
Additional affiliations
October 2009 - May 2015
Spanish National Research Council
Position
  • Research Associate

Publications

Publications (151)
Preprint
Molecular sequence data has transformed the field of lichen taxonomy and provided crucial insight into evolutionary relationships. However, DNA obtained from standard extraction methodologies may not yield sufficient high-quality DNA to successfully perform high-throughput sequencing. Furthermore, standard DNA extraction protocols often, require th...
Preprint
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Interactions between organisms are determined by species traits and differ in specialization, from generalist to highly specialized relationships. Although we expect that the effect of habitat loss and fragmentation on the abundance and survival of species depends on their degree of specialization, few studies have deepened into the interplay betwe...
Article
Full-text available
Speciation in oceanic islands has attracted the interest of scientists since the 19th century. One of the most striking evolutionary phenomena that can be studied in islands is adaptive radiation, that is, when a lineage gives rise to different species by means of ecological speciation. Some of the best-known examples of adaptive radiation are char...
Article
Two lichenicolous fungi, one growing on the thallus of Lobaria pulmonaria in the United Kingdom (Scotland) and the other in apothecia of Lobaria linita and L. oregana in northwestern North America (Alaska and British Columbia) and northeast Asia (Russian Far East, Khabarovsk Krai), show similarities to the species originally described as Dothidea h...
Article
Widespread geographic distributions in lichens have been usually explained by the high dispersal capacity of their tiny diaspores. However, recent phylogenetic surveys have challenged this assumption and provided compelling evidence for cryptic speciation and more restricted distribution ranges in diverse lineages of lichen-forming fungi. To evalua...
Article
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Numerous new taxa and classifications of Dothideomycetes have been published following the last monograph of families of Dothideomycetes in 2013. A recent publication by Honsanan et al. in 2020 expanded information of families in Dothideomycetidae and Pleosporomycetidae with modern classifications. In this paper, we provide a refined updated docume...
Article
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Lichens are present in most terrestrial ecosystems on Earth and colonize extreme habitats, where vascular plants are unable to thrive, due to unique properties of the fungal-algal symbiosis. Here, we explored the phylogeographic structure of green algae engaged in symbiosis with species in the genus Pseudephebe (Parmeliaceae). These often form deep...
Article
Abstract Lichens provide valuable systems for studying symbiotic interactions. In lichens, these interactions are frequently described in terms of availability, selectivity and specificity of the mycobionts and photobionts towards one another. The lichen-forming, green algal genus Trebouxia Puymaly is among the most widespread photobiont, associati...
Article
The identity of Calicium corynellum (Ach.) Ach. - Volume 52 Issue 4 - Maria Prieto, Ibai Olariaga, Sergio Pérez-Ortega, Mats Wedin
Article
Full-text available
Lichens are widely acknowledged to be a key component of high latitude ecosystems. However, the time investment needed for full inventories and the lack of taxonomic identification resources for crustose lichen and lichenicolous fungal diversity have hampered efforts to fully gauge the depth of species richness in these ecosystems. Using a combinat...
Article
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Glacier forefields provide a unique chronosequence to assess microbial or plant colonization and ecological succession on previously uncolonized substrates. Patterns of microbial succession in soils of alpine and subpolar glacier forefields are well documented but those affecting high polar systems, including moraine rocks, remain largely unexplore...
Article
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Los líquenes son asociaciones simbióticas formadas por la unión entre un hongo, llamado micobionte y, al menos, un alga y/o una cianobacteria, denominados fotobionte (Grube & Hawksworth, 2007). Desde un punto de vista evoluti­vo, la liquenización ha ocurrido en numerosas ocasiones de manera independiente en distintos linajes de hon­gos en las clase...
Article
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Molecular data and culture-dependent methods have helped to uncover the phylogenetic relationships of numerous species of lichenicolous fungi, a specialized group of taxa that inhabit lichens and have developed diverse degrees of specificity and parasitic behaviors. The majority of lichenicolous fungal taxa are known in either their anamorphic or t...
Article
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An interesting biota of lichen-forming fungi occurs along rocky seashores of cold and warm-temperate regions in both hemispheres. Most of the species belong to the family Verrucariaceae and form symbioses with an extraordinarily diverse group of photobionts. We isolated the photobionts of three species: Hydropunctaria maura and H. amphibia from the...
Article
Background and Aims Lichens represent a symbiotic relationship between at least one fungal and one photosynthetic partner. The association between the lichen-forming fungus Mastodia tessellata (Verrucariaceae) and different species of Prasiola (Trebouxiophyceae) has an amphipolar distribution and represents a unique case study for the understanding...
Article
Background and aims: Lichens represent a symbiotic relationship between at least one fungal and one photosynthetic partner. The association between the lichen-forming fungus Mastodia tessellata (Verrucariaceae) and different species of Prasiola (Trebouxiophyceae) has an amphipolar distribution and represents a unique case study for the understandi...
Article
Lichen-inhabiting fungi are highly specialized mycoparasites, commensals or rarely saprotrophs, that are common components of almost every ecosystem, where they develop obligate associations with lichens. Their relevance, however, contrasts with the relatively small number of these fungi described so far. Recent estimates and ongoing studies indica...
Article
The date of publication of the generic name Abrothallus is discussed, along with typification of the Abrothallus names proposed by Giuseppe De Notaris, Søren Christian Sommerfelt, and Ignaz Kotte. Pertinent historical collections have been examined, and each typication is supplied with a description in order to facilitate correct identifications. T...
Article
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Nomenclatural type definitions are one of the most important concepts in biological nomenclature. Being physical objects that can be re-studied by other researchers, types permanently link taxonomy (an artificial agreement to classify biological diversity) with nomenclature (an artificial agreement to name biological diversity). Two proposals to am...
Article
Some definitions of the term ‘lichen’ have often emphasized the role of the mycobiont as exhabitant in the symbiosis. Mastodia tessellata and Turgidosculum ulvae , both forming lichen-like associations with foliose algae, have traditionally defied that definition. In this study, we delve into the poorly known association of T. ulvae with Blidingia...
Article
Biodeterioration damage is an important issue in conservation and restoration of built heritage, especially when ceramic materials are used. Biological colonization of ceramic roofing tiles by lichens is a common phenomenon. However, there are no reports to date of lichens removal from unglazed roofing tiles for conservation purposes. This paper fo...
Article
Full-text available
Compared to other organisms, such as vascular plants or mosses, lichen-forming fungi have a high number of species occurring in both northern and southern hemispheres but are largely absent from intermediate, tropical latitudes. For instance, ca. 160 Antarctic species also occur in polar areas or mountainous temperate regions of the northern hemisp...
Article
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Knowledge of the relationships and thus the classification of fungi, has developed rapidly with increasingly widespread use of molecular techniques, over the past 10–15 years, and continues to accelerate. Several genera have been found to be polyphyletic, and their generic concepts have subsequently been emended. New names have thus been introduced...
Article
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Following the retreat of a glacier, microbial colonization paves the way for future plant successions as nutrients are gradually introduced into the ecosystem. Characterizing the dynamics of this initial microbial colonization process is a key to understanding how these rapidly receding glacier areas are colonized. This study examines primary succe...
Article
The hypotheses proposed to explain the high percentage of bipolar lichens in Antarctica have never been explicitly tested. We used the strictly bipolar, coastal lichenized fungus Mastodia tessellata (Verrucariaceae, Ascomycota) and its photobionts (Prasiola, Trebouxiophyceae, Chlorophyta) as model species to discern whether this extraordinary disju...
Article
Numerous recent studies of lichenized fungi have uncovered hidden genetic diversity within a single phenotypic entity (so-called ‘cryptic species’). Here we report the opposite situation with vastly different morphologies apparently deriving from the same genotype. Endocena is a monotypic genus known only from southern South America. The single rep...
Article
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Photosynthetic performance in lichens can vary throughout the year. We investigate the variation in the PSII quantum efficiency as a proxy for the physiological state of the photosynthetic apparatus in two umbilicate species from the genus Lasallia . Temporal variation in Fv / Fm in both species was monitored at a field site in Central Spain where...
Article
Knowledge on lichen and microbial colonization as well as associated biodeterioration processes of the stone cultural heritage is needed to establish proper conservation programs, but is still poor for stonework in semi-arid regions. In this study, lichen diversity was characterized on seven monumental buildings of the Pasargadae UNESCO-world herit...
Article
Symbiotic associations between green algae (Chlorophyta) and fungi give rise to morphologically and eco-physiologically distinct entities, or so-called, lichens. In one of the most peculiar of these associations, the partners are species of the macroscopic genus Prasiola (Trebouxiophyceae) and the ascomycete Mastodia tessellata (Verrucariaceae). Th...
Article
Many species of lichen-forming fungi are currently threatened by habitat loss, pollution, and climate change. Red Lists represent an important tool for conservation strategies of species and their habitats. To date, no Red List of these organisms is available in Spain and Portugal. Recently, the Spanish Lichen Society (SEL) launched an initiative i...
Article
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A previously established chronosequence from Pia Glacier forefield in Tierra del Fuego (Chile) containing soils of different ages (from bare soils to forest ones) is analyzed. We used this chronosequence as framework to postulate that microbial successional development would be accompanied by changes in functionality. To test this, the GeoChip func...
Article
Laser irradiation of lichen thalli on heritage stones serves for the control of epilithic and endolithic biological colonizations. In this work we investigate rock samples from two quarries traditionally used as source of monumental stone, sandstone from Valonsadero (Soria, Spain) and granite from Alpedrete (Madrid, Spain), in order to find conditi...
Article
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Etayo, J. & Pérez-Ortega, S. 2016. Lichenicolous lichens and fungi from Monfragüe National Park (western Spain). — Herzogia 29: 315–328. We present the first survey of lichenicolous lichens and fungi in Monfragüe National Park, Cáceres (Spain). Seven localities were visited, including the most characteristic ecosystems. Forty taxa were recorded, mo...
Article
Symbiotic associations between green algae (Chlorophyta) and fungi give rise to morphologically and eco-physiologically distinct entities, or so-called, lichens. In one of the most peculiar of these associations, the partners are species of the macroscopic genus Prasiola (Trebouxiophyceae) and the ascomycete Mastodia tessellata (Verrucariaceae). Th...
Conference Paper
Lichen-forming fungi interact with their photobionts showing different patterns, from highly specialized species to others that are able to interact with different photobiont lineages over their ranges. Most studies have so far focused on the range of photobionts interacting with a single species or with few species from the same community, genus o...
Conference Paper
Lichens, with 487 known species, are the most conspicuous component of the macroscopic biota in Antarctica. About 40% of them show amphitropical disjunct distributional ranges. Long-distance dispersion has been commonly invoked to explain this distribution pattern, but it is still unknown whether those species originated in or arrived to Antarctica...
Article
Foliicolous lichens are formed by diverse, highly specialized fungi that establish themselves and complete their life cycle within the brief duration of their leaf substratum. Over half of these lichen-forming fungi are members of either the Gomphillaceae or Pilocarpaceae, and associate with Trebouxia-like green algae whose identities have never be...
Article
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A new species of Shackletonia (Teloschistaceae) is described from the McMurdo Dry Valleys in Antarctica, one of the regions with the harshest conditions on Earth. Distinctive traits of the new taxon are the grey thallus, its black lecideine apothecia with a dark greenish blue exterior side of the exciple, Lecidea green pigment present at the cortex...
Article
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The fungal genus Collemopsidium comprises species that develop so-called borderline lichen symbioses with algae or cyanobacteria. Together with morphologically similar pyrenocarpous fungi it has been assigned to the family Xanthopyreniaceae. The adscription of this family to higher taxonomic ranks remain uncertain. Using sequence data of five nucle...
Article
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As part of a comprehensive revision of the Rhizocarpon geographicum species group using molecular and morphological approaches, we examined the name-bearing types of 15 species. We report ambiguities and inconsistencies with the reported features of some type specimens, original descriptions, and circumscriptions employed in keys for the identifica...
Article
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Identifying factors that influence species interactions is central to research in symbiotic systems. While lichens represent iconic models of symbiosis and play important roles in understanding the biology of symbiotic interactions, patterns of interactions in lichen symbionts and mechanisms governing these relationships are not well characterized....
Article
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Four new lichenicolous Tremella species are described and characterized morphologically and molecularly. Tremella celata grows on Ramalina fraxinea, inducing the formation of inconspicuous galls, and having hyphae with incomplete clamps. Tremella endosporogena develops intrahymenially in the apothecia of Lecanora carpinea, having single-celled basi...
Article
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The phylogenetic relationship of lecanoroid lichens is studied using two data sets: 1) a 2-locus data set including 251 OTUs representing 150 species, and 2) a 6-locus data set with 82 OTUs representing 53 species. The genus Lecanora as currently circumscribed is shown to be highly polyphyletic and several genera, including Adelolecia, Arctopeltis,...
Article
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We studied the evolutionary history of the Parmeliaceae (Lecanoromycetes, Ascomycota), one of the largest families of lichen-forming fungi with complex and variable morphologies, also including several lichenicolous fungi. We assembled a six-locus data set including nuclear, mitochondrial and low-copy protein-coding genes from 293 operational taxon...
Article
Four new species from Cuba are described in the genus Ocellularia, emphasizing the importance of the Caribbean for the diversification of lichen fungi and the level of unrecognized species richness in Ocellularia. Three of the new species belong in the O. bahiana group: O. coronata Lücking & Pérez-Ortega, differing from O. bahiana by the ridged to...
Conference Paper
Full-text available
The weathering of natural rocks traditionally distinguishes between biophysical and biochemical weathering processes. 80 years ago, the first studies of lichen‐rock interactions lead to the incorrect conclusion that deterioration of rock structure was entirely ascribed to physical causes. From decades it is well known that the lichen‐rock interface...
Poster
Full-text available
The poster shows same examples of different bioweathering actions in natural rocks and heritage stones
Article
Laser removal of biodeteriogen layers warrants detailed studies due to the advantages it brings with respect to mechanical elimination or the use of biocides. We have investigated elimination of biological crusts on dolomite stones from heritage sites in central Spain. The samples were colonized by epilithic crustose lichens of different species, s...
Conference Paper
Full-text available
A three-marker study on the population genetic structure and gene flow in Mastodia tesselata is presented. Cluster delimitation, phylogenetic relationships, divergence times and gene flow analyses are performed.
Conference Paper
Lichens with vagrant or unattached life forms occur in many areas of the world, from the low altitude, hot deserts and cold steppes to the high-altitude alpine areas and tundra (Pérez 1994,1997). These sites share similar arid or semiarid climatic condition, sparse vegetation and wind swept (Rosentreter 1993, Pérez-Ortega et al. 2012). Several lich...
Article
Full-text available
All fungi in the class Lichinomycetes are lichen-forming and exclusively associate with cya-nobacteria. Two closely related maritime species of the genus Lichina (L. confinis and L. pygmaea) show similar distribution ranges in the Northeast Atlantic, commonly co-occurring at the same rocky shores but occupying different littoral zones. By means of...
Article
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The new genus of lichenicolous fungi Austrostigmidium is described from Antarctica and Tierra del Fuego (Chile). It is characterized by the presence of black pseudothecia, pseudoparaphyses, fissitunicate, I2, KI2 asci and 3-septate hyaline ascospores. So far, the only known species grows on Mastodia tessellata (Verrucariales, Eurotiomycetes). The n...
Article
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The new species Caliciopsis valentina from the eastern Iberian Peninsula is characterized morphologically, anatomically, and molecularly. The occurrence of C. subcorticalis (Cooke & Ellis) Fitzp. in Europe is discussed. Based on the revision of fresh and herbarium specimens we propose the new combination Caliciopsis beckhausii with a neotype select...
Article
Species of the genus Abrothallus (Abrothallales, Dothideomycetes) are obligately lichenicolous (lichen-inhabiting) and grow on a wide variety of foliose and fruticose lichens. Bayesian Interference (BI) and Maximum likelihood (Ml) analyses of two gene loci—rDNA ITS and TEF-α—were used in order to infer the phylogenetic relationships among lineages...
Article
Full-text available
The ascomycete genus Xylographa includes some of the most abundant species of wood-inhabiting lichenized fungi in boreal and temperate regions. It has never been monographed and little is known of its species diversity and evolutionary relationships. Based on a morphological and secondary metabolite-based assessment of material from North and South...
Article
Full-text available
Based on a combined three locus analysis two new genera, Charcotiana and Amundsenia, are proposed in the lichen family Teloschistaceae, subfamily Xanthorioideae. Charcotiana includes the new species C. antarctica, which is known only from continental Antarctica. The bipolar genus Amundsenia includes the new species A. austrocontinentalis, which is...
Conference Paper
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Con c. 487 especies conocidas1, muchas de ellas endémicas, los líquenes dominan el paisaje Antártico. Algunas de las especies muestran patrones de distribución bipolar y se desconoce si su presencia en la Antártida es fruto de colonizaciones a larga distancia o si se trata de taxones antárticos propiamente dichos. Los estudios filogeográficos permi...
Article
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Se presenta un catálogo de 462 hongos liquenizados y liquenícolas de la Sierra de Albarracín (Teruel, Aragón, España), como resultado de la IV Campaña de Recolección organizada por la Sociedad Española de Liquenología (SEL). Diplotomma hedinii es novedad para la Península Ibérica y Lepraria leuckertiana constituye una segunda cita peninsular, 69 ta...
Conference Paper
Full-text available
Fruto del estudio filogeográfico que se está llevando a cabo con el liquen Mastodia tessellata (Verrucariaceae, Ascomycota), se ha descubierto una nueva especie de hongo liquenícola. Mastodia tessellata constituye un liquen singular debido a que es el único caso conocido de simbiosis liquénica entre un hongo y una alga foliosa. Este hecho hizo que...