61 Works

Data from: The influence of developmental environment on courtship song in cactophilic Drosophila

Patricia P. Iglesias, Eduardo M. Soto, Ignacio M. Soto, Betina Colines & Esteban Hasson
Closely related species often differ in the signals involved in sexual communication and mate recognition. Determining the factors influencing signal quality (i.e. signal's content and conspicuousness) provides an important insight into the potential pathways by which these interspecific differences evolve. Host specificity could bias the direction of the evolution of sexual communication and the mate recognition system, favoring sensory channels that work best in the different host conditions. In this study, we focus on the...

Data from: Mapping extinction debt highlights conservation opportunities for birds and mammals in the South American Chaco

Asunción Semper-Pascual, Leandro Macchi, Francesco Maria Sabatini, Julieta Decarre, Matthias Baumann, Pedro G. Blendinger, Bibiana Gómez-Valencia, Matias E. Mastrangelo & Tobias Kuemmerle
1. Habitat loss is the primary cause of local extinctions. Yet, there is considerable uncertainty regarding how fast species respond to habitat loss, and how time-delayed responses vary in space. 2. We focused on the Argentine Dry Chaco (ca. 32 million ha), a global deforestation hotspot, and tested for time-delayed response of bird and mammal communities to landscape transformation. We quantified the magnitude of extinction debt by modelling contemporary species richness as a function of...

Data from: Plant functional composition affects soil processes in novel successional grasslands

Laura Yahdjian, Pedro M. Tognetti & Enrique J. Chaneton
1. Secondary succession may lead to novel, exotic-dominated community states differing in structure and function from the original native counterparts. We hypothesized that grassland soil processes associated with C and N cycling decelerate with community turnover from short-lived forbs and grasses to long-lived native grasses, whereas invasion by exotic perennial grasses maintains fast cycling rates. 2. We measured litter C and N turnover during decomposition, soil respiration, and soil N dynamics in synthetic plant communities...

Data from: Phylogenetic relationships of toads of the Rhinella granulosa group (Anura: Bufonidae): a molecular perspective with comments on hybridization and introgression

Martín O. Pereyra, Diego Baldo, Boris L. Blotto, Patricia P. Iglesias, Maria T. C. Thomé, Célio F. B. Haddad, César Barrio-Amorós, Roberto Ibáñez & Julián Faivovich
The Rhinella granulosa group consists of 13 species of toads distributed throughout open areas of South America and Panama. In this paper we perform a phylogenetic analysis considering all but one species of the group, employing five nuclear and four mitochondrial genes, for up to 7910 bp per specimen. Separate phylogenetic analyses under direct optimization (DO) of nuclear and mitochondrial sequences recovered the R. granulosa group as monophyletic and revealed topological incongruence that can be...

Data from: Community disassembly and invasion of remnant native grasslands under fluctuating resource supply

Pedro Maximiliano Tognetti & Enrique Jose Chaneton
1. Native vegetation fragments embedded in anthropogenic landscapes are increasingly threatened by land-use intensification. Managing disturbance regimes and nutrient inputs may help maintain species diversity in such remnants. Yet it is unclear the extent to which changes in resource availability due to reduced capture by resident plants and/or increased supply rates may trigger native community disassembly and exotic invasions. 2. We examined how mowing disturbance and N fertilizer addition affected plant community recovery after a...

Evolution of male genitalia in the Drosophila repleta species group (Diptera: Drosophilidae)

Manuel Stefanini, Marco Silva Gottschalk, Natalia Soledad Calvo & Ignacio Maria Soto
The Drosophila repleta group comprises more than one hundred species that inhabit several environments in the Neotropics and use different hosts as rearing and feeding resources. Rather homogeneous in their external morphology, they are generally distinguished by the male genitalia, their fastest evolving morphological trait, constituting an excellent model to study patterns of genital evolution in the context of a continental adaptive radiation. Although much is known about the evolution of animal genitalia at population...

Data from: Different frequency control mechanisms and the exploitation of frequency space in passerines

Franz Goller, Jay Love & Gabriel Mindlin
1. Birdsong is used in reproductive context and, consequently, has been shaped by strong natural and sexual selection. The acoustic performance includes a multitude of acoustic and temporal characteristics that are thought to honestly reveal the quality of the singing individual. 2. One major song feature is frequency and its modulation. Sound frequency can be actively controlled, but the control mechanisms differ between different groups. Two described mechanisms are pressure-driven frequency changes in suboscines and...

Data from: Ontogeny in the steinmanellines (Bivalvia: Trigoniida): an intra- and interspecific appraisal using the Early Cretaceous faunas from the Neuquén Basin as a case study

Pablo S. Milla Carmona, Dario G. Lazo & Ignacio M. Soto
Despite the paleontological relevance and paleobiological interest of trigoniid bivalves, our knowledge of their ontogeny –an aspect of crucial evolutionary importance– remains limited. Here, we assess the intra- and interspecific ontogenetic variations exhibited by the genus Steinmanella Crickmay (Myophorellidae: Steinmanellinae) during the early Valanginian – late Hauterivian of Argentina, and explore some of their implications. The (ontogenetic) allometric trajectories of seven species recognized for this interval were estimated from longitudinal data using 3D geometric morphometrics,...

Data from: Megaphylogeny resolves global patterns of mushroom evolution

Torda Varga, Krisztina Krizsán, Csenge Földi, Bálint Dima, Marisol Sánchez-García, Santiago Sánchez-Ramírez, Gergely J. Szöllősi, János G. Szarkándi, Viktor Papp, László Albert, William Andreopoulos, Claudio Angelini, Vladimír Antonín, Kerrie W. Barry, Neale L. Bougher, Peter Buchanan, Bart Buyck, Viktória Bense, Pam Catcheside, Mansi Chovatia, Jerry Cooper, Wolfgang Dämon, Dennis Desjardin, Péter Finy, József Geml … & László G. Nagy
Mushroom-forming fungi (Agaricomycetes) have the greatest morphological diversity and complexity of any group of fungi. They have radiated into most niches and fulfill diverse roles in the ecosystem, including wood decomposers, pathogens or mycorrhizal mutualists. Despite the importance of mushroom-forming fungi, large-scale patterns of their evolutionary history are poorly known, in part due to the lack of a comprehensive and dated molecular phylogeny. Here, using multigene and genome-based data, we assemble a 5,284-species phylogenetic tree...

Data from: The grass was greener: repeated evolution of specialized morphologies and habitat shifts in ghost spiders following grassland expansion in South America

Fadia Sara Ceccarelli, Nicolas Mongiardino Koch, Eduardo M. Soto, Mariana L. Barone, Miquel A. Arnedo & Martin J. Ramirez
While grasslands, one of Earth’s major biomes, are known for their close evolutionary ties with ungulate grazers, these habitats are also paramount to the origins and diversification of other animals. Within the primarily South American spider subfamily Amaurobioidinae (Anyphaenidae), several species are found living in the continent’s grasslands, with some displaying putative morphological adaptations to dwelling unnoticed in the grass blades. Here, a dated molecular phylogeny provides the backbone for analyses revealing the ecological and...

Data from: Transcriptome modulation during host shift is driven by secondary metabolites in desert Drosophila

Diego N. De Panis, Julián Padró, Pedro Furió-Tarí, Sonia Tarazona, Pablo S. Milla Carmona, Ignacio M. Soto, Hernán Dopazo, Ana Conesa & Esteban Hasson
High-throughput transcriptome studies are breaking new ground to investigate the responses that organisms deploy in alternative environments. Nevertheless, much remains to be understood about the genetic basis of host plant adaptation. Here, we investigate genome-wide expression in the fly Drosophila buzzatii raised in different conditions. This species uses decaying tissues of cactus of the genus Opuntia as primary rearing substrate and secondarily, the necrotic tissues of the columnar cactus Trichocereus terscheckii. The latter constitutes a...

Data from: Climate and sea-level changes across a shallow marine Cretaceous–Palaeogene boundary succession in Patagonia, Argentina

Johan Vellekoop, Femke Holwerda, Mercedes B. Prámparo, Verónica Willmott, Stefan Schouten, Nestor R. Cúneo, Roberto A. Scasso & Henk Brinkhuis
Upper Maastrichtian to lower Paleocene, coarse-grained deposits of the Lefipán Formation in Chubut Province, (Patagonia, Argentina) provide an opportunity to study environmental changes across the Cretaceous–Palaeogene (K–Pg) boundary in a shallow marine depositional environment. Marine palynological and organic geochemical analyses were performed on the K–Pg boundary interval of the Lefipán Formation at the San Ramón section. The palynological and organic geochemical records from the San Ramón K–Pg boundary section are characteristic of a highly dynamic,...

Data from: Taxonomy of the bivalve Ptychomya in the Lower Cretaceous of the Neuquén basin (west-central Argentina)

Pablo S. Milla Carmona, Dario G. Lazo & Ignacio M. Soto
In the Lower Cretaceous Agrio Formation, Neuquén Basin (west-central Argentina), the highly variable genus Ptychomya Agassiz has challenged traditional taxonomists for over a century. Here we apply a previously outlined quantitative protocol in order to settle the taxonomy of the genus based on specimens recorded from the base to the top of the Agrio Formation. The shell outline and ribbing pattern, two prominent external features of the valves, were quantified using geometric morphometric measurements of...

Data from: Broad-scale variation of fungal-endophyte incidence in temperate grasses

María Semmartin, Marina Omacini, Pedro E. Gundel & Ignacio M. Hernández-Agramonte
1. The strength of many interactions between plants and other organisms changes across regional gradients. For example, the relevance of plant-herbivore interactions increases with primary production. Likewise, biotic interactions collectively become more intense from the poles to the equator. Yet, the regional variation of the interaction between grasses and systemic fungal endophytes, which provide resistance to biotic and abiotic environmental factors (i.e. herbivory and drought), is poorly understood. 2. We compiled 1008 records of the...

Optomotor response (eye movment) and avoidance responses (locomotor activity) of crabs Neohelice granulata for LP-lesioned, control lesioned and control crabs

Yair Barnatan, Daniel Tomsic, Alejandro Cámera & Julieta Sztarker
When an animal rotates (whether it is an arthropod, a fish, a bird, or a human) a drift of the visual panorama occurs over its retina, termed optic flow. The image motion is stabilized by compensatory behaviors (driven by the movement of the eyes, head or the whole body depending on the animal) collectively termed optomotor response (OR). Dipteran lobula plate has been consistently linked with optic flow processing and the control of optomotor responses....

Mutualism has its limits: consequences of asymmetric interactions between a well-defended plant and its herbivorous pollinator

Robert Raguso & Maria Sol Balbuena
Concern for pollinator health has focused on social bees and their agricultural services, but not all pollinators are bees, and their ecosystem services also promote biodiversity and conservation. Pollinating herbivores generate ecological conflicts when they utilize the same plant as a nectar source and larval host. We tracked individual-level metrics of pollinator health – growth, survivorship, fecundity – across the life cycle of a pollinating herbivore, the hawkmoth Hyles lineata, through its interactions with Oenothera...

Data from: The gastropod family Aporrhaidae in the Lower Cretaceous of the Neuquén Basin, west-central Argentina

Cecilia S. Cataldo
The gastropod fauna of the Lower Cretaceous of the Argentinian Neuquén Basin contains three aporrhaid species. Protohemichenopus neuquensis Camacho, 1953 is the most abundant, longest-lived, and most geographically widespread of the aporrhaids of this basin, and its protoconch and early teleoconch whorls were unknown until now. The new species Dimorphosoma weaveri features convex to subtly angular spire whorls with opisthocyrt collabral ribs that are more prominent towards the mid-whorl, a bicarinate last whorl with small...

Data from: Effects of grazing intensity on plant richness and diversity: a meta-analysis

Cristina Herrero-Jáuregui & Martin Oesterheld
Most of our knowledge of the effect of grazing on grassland structure is based on grazed-ungrazed contrasts. The effects of grazing in the most common scenario, where grazing intensity varies from low to high grazing intensity, are less known. The objectives of this paper were to (1) quantify the effect of stocking rates on species richness and diversity of grasslands world-wide, and (2) evaluate the response under different environmental and experimental conditions. We conducted a...

Is Cyclocardia (Conrad) a wastebasket taxon? Exploring the phylogeny of the most diverse genus of the Carditidae (Archiheterodonta, Bivalvia)

Damian Perez & Luciana Giachetti
The carditid genus Cyclocardia is currently the most diverse genus of the family, including nearly 180 nominal species from a wide stratigraphical (Cretaceous–Recent) and geographical range (Antarctica, South and North America, Europe, Africa, Alaska, Russia, Japan, and New Zealand). Due to the lack of autapomorphies in the diagnosis of the genus and its large account of species, we re-evaluated the systematic and phylogenetic status of Cyclocardia. We carried out three approaches: bibliographic revision, phylogenetic analysis,...

Global patterns of rainfall partitioning by invasive woody plants

Juan Ignacio Whitworth-Hulse, Patricio N. Magliano, Sebastián R. Zeballos, Sebastián Aguiar & Germán Baldi
Aim: Invasive species have the potential to alter hydrological processes by changing the local water balance. However, general patterns of how rainfall is partitioned into interception, throughfall and stemflow for invasive species worldwide have been seldom explored. We (a) describe the percentage of interception, throughfall and stemflow for the invasive woody plant species; (b) analyse the influence of morphological attributes (i.e., life-form, bark roughness, leaf type, leaf phenology and leaf area index) of invasive species...

Song parameters, repertoire size and song sharing within and across age classes in the saffron finch

Maria Juliana Benitez Saldivar, Carolina Isabel Miño & Viviana Massoni
Birds sing mostly to attract partners or to defend territories or resources. In relation to the first function, song can vary with age if older experienced males signal their quality through their vocal output. Regarding the second function, song can also vary with age if singing behavior helps mediate social interactions through repertoire sharing with neighbors. Here, we investigate whether song parameters change with age, and in which direction, in saffron finches Sicalis flaveola pelzelni,...

Data from: Loss of fungal symbionts at the arid limit of the distribution range in a native Patagonian grass – resource ecophysiological relations

Cecilia Casas, Pedro E. Gundel, Eluney Deliens, Leopoldo J. Iannone, Guillermo García Martinez, María V. Vignale & Hans Schnyder
1. Crucial to our understanding of plant ecology is the consideration of the eco-physiological responses and constraints of plant-fungal symbioses throughout the native distribution range of their host. 2. We examined key eco-physiological roles of two co-occurring fungal symbionts [Epichloë endophytes and arbuscular mycorrhizal fungi (AMF)] in the endemic grass Hordeum comosum across a wide bioclimatic gradient and contrasting grazing severity. We sampled H. comosum plants along four humid-to-arid transects in Patagonia, Argentina, covering its...

Data from: Natural hazards and wildlife health: the effects of a volcanic eruption on the Andean condor

Pablo Plaza, Guillermo Wiemeyer, Guillermo Blanco, Pablo Alarcón, Dámaso Hornero-Méndez, José Antonio Donázar, José Antonio Sánchez-Zapata, Fernando Hiraldo, Jesús De La Rosa & Sergio Agustín Lambertucci
Volcanic eruptions produce health changes in animals that may be associated with emitted gases and deposited ashes. We evaluated whether the Puyehue–Cordón Caulle volcanic eruption in 2011 produced health changes in the threatened Andean condor (Vultur gryphus) living in the area most affected by the eruption, north-western Patagonia. We studied clinical and biochemical parameters of condors examined before and after the eruption. We also examined concentrations of different metals and metalloids in the blood of...

Data from: Walk before you jump: new insights on early frog locomotion from the oldest known salientian

Andrés Ignacio Lires, Ignacio Maria Soto & Raúl Orencio Gómez
Understanding the evolution of a Bauplan starts with discriminating phylogenetic signal from adaptation and the latter from exaptation in the observed biodiversity. Whether traits have predated, accompanied, or followed evolution of particular functions is the basic inference to establish the type of explanations required to determine morphological evolution. To accomplish this, we focus in a particular group of vertebrates, the anurans. Frogs and toads have a unique Bauplan among vertebrates, with a set of postcranial...

Data from: Multigene phylogenetic analyses of the Thelonectria coronata and T. veuillotiana species complexes

Gary J. Samuels, Catalina Salgado-Salazar, Amy Y. Rossman, Mariana Capdet & Priscila Chaverri
Thelonectria is a recently established genus of common and ubiquitous fungi on woody hosts, previously placed in the genus Neonectria. Thelonectria coronata and T. veuillotiana occur sympatrically in several geographical areas in tropical, subtropical, and temperate regions. Previous taxonomic studies including T. coronata and T. veuillotiana suggested these fungi could represent species complexes; however, the morphological features used to define species exhibited few differences useful for testing this hypothesis. In order to assess the status...

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  • University of Buenos Aires
  • National Scientific and Technical Research Council
  • Bernardino Rivadavia Natural Sciences Museum
  • University of California, Berkeley
  • United States Department of Agriculture
  • Sao Paulo State University
  • Stanford University
  • University of Münster
  • University of Guelph