105 Works

Data from: Ancient mitochondrial DNA provides high-resolution time scale of the peopling of the Americas

Bastien Llamas, Lars Fehren-Schmitz, Guido Valverde, Julien Soubrier, Swapan Mallick, Nadin Rohland, Susanne Nordenfelt, Cristina Valdiosera, Stephen M. Richards, Adam Rohrlach, Maria Inés Barreto Romero, Isabel Flores Espinoza, Elsa Tomasto Cagigao, Lucía Watson Jiménez, Krzysztof Makowski, Ilán Santiago Leboreiro Reyna, Josefina Mansilla Lory, Julio Alejandro Ballivián Torrez, Mario A. Rivera, Richard L. Burger, Maria Constanza Ceruti, Johan Reinhard, R. Spencer Wells, Gustavo Politis, Calogero M. Santoro … & Wolfgang Haak
The exact timing, route, and process of the initial peopling of the Americas remains uncertain despite much research. Archaeological evidence indicates the presence of humans as far as southern Chile by 14.6 thousand years ago (ka), shortly after the Pleistocene ice sheets blocking access from eastern Beringia began to retreat. Genetic estimates of the timing and route of entry have been constrained by the lack of suitable calibration points and low genetic diversity of Native...

Data from: Drosophila wing modularity revisited through a quantitative genetic approach

Francesc Muñoz-Muñoz, Valeria Paula Carreira, Neus Martínez-Abadías, Victoria Estefanía Ortiz, Rolando González-José, Ignacio M. Soto & Victoria Ortiz
To predict the response of complex morphological structures to selection it is necessary to know how the covariation among its different parts is organized. Two key features of covariation are modularity and integration. The Drosophila wing is currently considered a fully integrated structure. Here, we study the patterns of integration of the Drosophila wing and test the hypothesis of the wing being divided into two modules along the proximo-distal axis, as suggested by developmental, biomechanical,...

Data from: The role of trait combination in the conspicuousness of fruit display among bird-dispersed plants

Mariano Ordano, Pedro G. Blendinger, Silvia B. Lomáscolo, Natacha P. Chacoff, Mariano S. Sánchez, María G. Núñez-Montellano, Julieta Jiménez, Román A. Ruggera & Mariana Valoy
In visually-driven seed dispersal mutualisms, natural selection should promote plant strategies that maximize fruit visibility to dispersers. Plants might increase seed dispersal profitability by increasing conspicuousness of fruit display, understood as a plant strategy to maximize fruit detectability by seed dispersers. The role of different plant traits in fruit choice and consumption by seed dispersers has been broadly studied. However, there is no clear evidence about the importance of the traits that increase conspicuousness of...

Data from: Patterns of cranial shape diversification during the phylogenetic branching process of New World monkeys (Primates: Platyrrhini)

Sergio I Perez, Júlia Klaczko, Guido Rocatti & Sergio F Dos Reis
One of the central topics in evolutionary biology is understanding the processes responsible for phenotypic diversification related to ecological factors. New World monkeys are an excellent reference system to investigate processes of diversification at macroevolutionary scales. Here, we investigate the cranial shape diversification related to body size and ecology during the phylogenetic branching process of platyrrhines. To investigate this diversification, we used geometric morphometric techniques, a molecular phylogenetic tree, ecological data and phylogenetic comparative methods....

Data from: Diversity, phylogeny and biogeography of the South American ‘cardiomyine’ rodents (Hystricognathi, Cavioidea) with a description of two new species

María E. Pérez, Cecilia M. Deschamps & María G. Vucetich
‘Cardiomyine’ rodents are extinct large terrestrial Caviidae closely related to capybaras, that inhabited large parts of South America during the middle Miocene and Pliocene. They are mostly preserved as isolated teeth, but also as skull and jaw fragments. Here we revise the taxonomy of this group and describe two new species, each pertaining to one of the two main late Miocene groups, represented by the genera Caviodon and Cardiomys. This suggests that the diversity of...

Data from: Richards’s equation and nonlinear mixed models applied to avian growth: why use them?

Walter S. Svagelj, Agustina Gómez Laich & Flavio Quintana
Postnatal growth is an important life-history trait that varies widely across avian species, and several equations with a sigmoidal shape have been used to model it. Classical three-parameter models have an inflection point fixed at a percentage of the upper asymptote which could be an unrealistic assumption generating biased fits. The Richards model emerged as an interesting alternative because it includes an extra parameter that determines the location of the inflection point which can move...

Data from: Palaeoproteomics resolves sloth phylogeny

Samantha Presslee, Graham J. Slater, Francois Pujos, Analia M. Forasiepi, Roman Fischer, Kelly Molloy, Meaghan Mackie, Jesper V. Olsen, Alejandro Kramarz, Matias Taglioretti, Fernando Scaglia, Maximiliano Lezcano, José Luis Lanata, John Southon, Robert Feranec, Jonathan Bloch, Adam Hajduk, Fabiana M. Martin, Rodolfo Salas Gismondi, Marcelo Reguero, Christian De Muizon, Alex Greenwood, Brian T. Chait, Kirsty Penkman, Matthew Collins … & Ross D. E. MacPhee
The living tree sloths Choloepus and Bradypus are the only remaining members of Folivora, a major xenarthran radiation that occupied a wide range of habitats in many parts of the western hemisphere during the Cenozoic, including both continents and the West Indies. Ancient DNA evidence has played only a minor role in folivoran systematics, as most sloths lived in places not conducive to genomic preservation. Here we utilize collagen sequence information, both separately and in...

Data from: A reevaluation of the Andean Genus Petroravenia (Brassicaceae: Thelypodieae) based on morphological and molecular data

Diego L. Salariato, Fernando O. Zuloaga & Ihsan A. Al-Shehbaz
Abstract Petroravenia was until recently considered as a genus of three species (P. eseptata, P. friesii, and P. werdermannii) distributed along the Central Andes of Argentina, Bolivia, Chile, and Peru. This genus was included in the tribe Thelypodieae and was morphologically characterized by being tiny rhizomatous perennial herbs with rosulate leaves, dendritic trichomes, capsular silicles, and incumbent cotyledons. However, the phylogeny of Petroravenia, and its tribal placement, was never analyzed using molecular data. The lack...

Hearing from the ocean and into the river: The evolution of the inner ear of Platanistoidea (Cetacea, Odontoceti)

Mariana Viglino, Maximiliano Gaetán, Mónica R. Buono, R. Ewan Fordyce & Travis Park
The inner ear of the two higher clades of modern cetaceans (Neoceti) is highly adapted for hearing infrasonic (mysticetes) or ultrasonic (odontocetes) frequencies. Within odontocetes, Platanistoidea comprises a single extant riverine representative, Platanista gangetica, and a diversity of mainly extinct marine species from the late Oligocene onward. Recent studies, drawing on features including the disparate tympanoperiotic, have not yet provided a consensus phylogenetic hypothesis for platanistoids. Further, cochlear morphology and evolutionary patterns have never been...

Heaps' law and Heaps functions in tagged texts: Evidences of their linguistic relevance

Damián Zanette & Andrés Chacoma
We study the relationship between vocabulary size and text length in a corpus of 75 literary works in English, authored by six writers, distinguishing between the contributions of three grammatical classes (or ``tags,'' namely, nouns, verbs, and others), and analyze the progressive appearance of new words of each tag along each individual text. We find that, as prescribed by Heaps' law, vocabulary sizes and text lengths follow a well-defined power-law relation. Meanwhile, the appearance of...

Domestic and wild native herbivores combined are still overgrazing Patagonia rangelands: A response to Marino et al. (2019)

Gabriel Esteban Oliva, Paula Paredes, Daniela Ferrante, Carla Cepeda & Jorge Rabinovich
1. Oliva et al. (2019) based upon primary productivity estimates concluded that, after long periods of overgrazing, Patagonia´s domestic stocks adjusted to regional-scale herbivore carrying capacity at the end of last century. Guanaco populations, a native camelid, increased thereafter driving combined grazing pressures once again over carrying capacity in some areas. 2. Marino, Rodriguez and Schroeder (2019) argued that domestic grazing is not really at equilibrium because domestic stocks are concentrated in areas that remain...

Data used to estimate the influence of habitat protection, habitat heterogeneity, and periodic flooding on species richness and abundance of waterbirds of the lower Paraná River, Argentina

Virginia Quiroga, Ana Laura Ronchi-Virgolini, Rodrigo Lorenzon & Martjan Lammertink
Interest has grown in how birds respond to environmental characteristics of river systems, motivated by the high biodiversity and biomass of waterbirds in these systems and the importance of waterbirds in hunting for sport or sustenance. We studied the influence of natural (water level fluctuations and environmental heterogeneity) and human-related (cattle grazing and hunting) factors on waterbirds in the Pre-Delta region of the Paraná River system during three years. Our objectives were to evaluate which...

Lack of head sparing following third-trimester caloric restriction among Tanzanian Maasai

Paula Gonzalez, Christopher Powell, Warren Wilson, Godwin Olesaningo, Mange Manyama, Heather Jamniczky, Richard Spritz, James Cross, Keneth Lukowiak & Benedikt Hallgrimsson
The reduction of food intake during pregnancy is part of many cultural and religious traditions around the world. The impact of such practices on fetal growth and development are poorly understood. Here, we examined the patterns of diet intake among Maasai pregnant women and assessed their effect on newborn morphometrics. We recruited 141 mother-infant pairs from Ngorongoro Conservation Area (NCA) in Northern Tanzania and quantified dietary intake and changes in maternal diet during pregnancy. We...

Data from: Rapid speciation via the evolution of pre-mating isolation

Sheela Turbek, Melanie Browne, Adrián S. Di Giacomo, Cecilia Kopuchian, Wesley Hochachka, M. Cecilia Estalles, Darío Lijtmaer, Pablo Tubaro, Luís Fábio Silveira, Irby J. Lovette, Rebecca Safran, Scott Taylor & Leonardo Campagna
Behavioral isolation can catalyze speciation and permit the slow accumulation of additional reproductive barriers between co-occurring organisms. We illustrate how this process occurs by examining the genomic and behavioral bases of pre-mating isolation between two bird species (Sporophila hypoxantha and the recently discovered S. iberaensis) that belong to the capuchino seedeaters, a recent, rapid radiation characterized by variation in male plumage coloration and song. Though these two species co-occur without ecological barriers to reproduction, we...

Data from: Detecting hybridization by likelihood calculation of gene tree extra lineages given explicit models

Melisa Olave, Luciano J. Avila, , Mariana Morando & Jack W. Sites
Explanations for gene tree discordance with respect to a species tree are commonly attributed to deep coalescence (also known as incomplete lineage sorting [ILS]), as well as different evolutionary processes such as hybridization, horizontal gene transfer and gene duplication. Among these, deep coalescence is usually quantified as the number of extra lineages and has been studied as the principal source of discordance among gene trees, while the other processes that could contribute to gene tree...

Host suitability and fitness-related parameters in Coptera haywardi ([Hymenoptera]: [Diapriidae]) reared on irradiated Ceratitis capitata ([Diptera]: [Tehritidae]) pupae stemming from the genetic sexing Vienna-8 strain with a temperature-sensitive lethal mutation

Segundo R. Núñez-Campero, Suarez Lorena, Buonocore Biancheri María Josefina, Cancino Jorge, Murúa Fernando, Molina Diego, Laría Osvaldo, Aluja Martín & Ovruski Sergio M.
Coptera haywardi (Ogloblin) is a pupal endoparasitoid of tephritid flies with great potential as a biological control agent worldwide as it does not attack other Diptera. To reach its full potential, its mass rearing needs to be enhanced lowering costs. Here, we focused on the use of irradiated pupae of Ceratitis capitata (Wiedemann) stemming from the temperature-sensitive lethal (tsl) Vienna-8 genetic sexing strain (= CcVienna-8), which is mass-produced in the San Juan Medfly and Parasitoid...

Acesso à saúde e vulnerabilidades de migrantes internacionais no contexto de disseminação da COVID-19: uma pesquisa interinstitucional em rede colaborativa.

DENISE MARTIN
O avanço da pandemia de COVID-19 levou a Organização Mundial da Saúde (OMS) a decretar emergência internacional em janeiro de 2020. Em meados de março do mesmo ano, o Brasil, a exemplo de vários países do mundo, adotou o isolamento social e restrição à mobilidade como medida de prevenção e combate do contágio e disseminação do vírus no país, medida que vem sendo adotada contingencialmente até o momento. Tal situação gerou várias disputas entre grupos...

Data from Cretaceous-Paleogene plant extinction and recovery in Patagonia

Elena Stiles, Peter Wilf, Ari Iglesias, María Alejandra Gandolfo & N. Rubén Cúneo
The Cretaceous-Paleogene (K/Pg) extinction appears to have been geographically heterogeneous for some organismal groups. Southern Hemisphere K/Pg palynological records have shown lower extinction and faster recovery than in the Northern Hemisphere, but no comparable, well-constrained Southern Hemisphere macrofloras spanning this interval had been available. Here, macrofloral turnover patterns are addressed for the first time in the Southern Hemisphere, using over 3,500 dicot leaves from the latest Cretaceous (Maastrichtian) and the earliest Paleocene (Danian) of Argentine...

Proteolytic cleavage of Arabidopsis thaliana phosphoenolpyruvate carboxykinase-1 modifies its allosteric regulation

Bruno E Rojas, Matias D Hartman, Carlos M Figueroa & Alberto A Iglesias
Phosphoenolpyruvate carboxykinase (PEPCK) plays a crucial role in gluconeogenesis. In this work, we analyze the proteolysis of Arabidopsis thaliana PEPCK1 (AthPEPCK1) in germinating seedlings. We found that the amount of AthPEPCK1 protein peaks at 24-48 hours post-imbibition. Concomitantly, we observed shorter versions of AthPEPCK1, putatively generated by metacaspase-9 (AthMC9). To study the impact of AthMC9 cleavage on the kinetic and regulatory properties of AthPEPCK1, we produced truncated mutants based on the reported AthMC9 cleavage sites....

Low reproductive success of the endangered Iberá Seedeater in its only known breeding site, the Iberá Wetlands, Argentina

Melanie Browne, Sheela P. Turbek, Constanza Pasian & Adrián S. Di Giacomo
Subtropical grasslands are highly susceptible to habitat conversion and number among South America’s most threatened ecosystems. The grasslands of northeastern Argentina have been identified as a priority conservation area for threatened capuchino seedeaters because they constitute the main breeding area of these migratory birds. The Iberá Seedeater (Sporophila iberaensis) is a newly described species in the Iberá Wetlands in Argentina whose biology is still poorly understood. The endangered species inhabits grasslands, but has only been...

Data from: Late Oligocene caviomorph rodents from Contamana, Peruvian Amazonia

Myriam Boivin, Laurent Marivaux, Adriana M. Candela, Maëva J. Orliac, François Pujos, Rodolfo Salas-Gismondi, Julia V. Tejada-Lara & Pierre-Olivier Antoine
The Deseadan South American Land Mammal Age (late Early Oligocene – Late Oligocene) attests to a time of great diversification in the caviomorph rodent fossil record. Nevertheless, Deseadan rodent-bearing localities in Neotropical lowlands are few and poorly known. Here we describe the rodent assemblages from two Late Oligocene localities, near Contamana, Loreto, Peru. Seven taxa are new to science: Palaeosteiromys amazonensis gen. et sp. nov., Plesiosteiromys newelli gen. et sp. nov., Loretomys minutus gen. et...

Data from: Do neophobia and dietary wariness explain ecological flexibility? An analysis with two seed-eating birds of contrasting habits

Sergio R. Camín, Valeria Martín-Albarracín, María Milagros Jefferies & Luis Marone
The neophobia threshold hypothesis (NTH) suggests that the acquisition and maintenance of a high behavioral and ecological flexibility in the evolutionary and adaptive history of a species is the consequence of lower levels of neophobia towards new micro-habitats and of dietary wariness of novel foods. To test this idea we assessed the degree of neophobia and dietary wariness in two seed-eating bird species with contrasting degrees of ecological flexibility that inhabit the central Monte desert...

Data from: Walking on ashes: insect trace fossils from Laetoli indicate poor grass cover associated with early hominin environments

Jorge F. Genise & Terry Harrison
More than 4000 insect trace fossils collected in recent years from Pliocene deposits at Laetoli in northern Tanzania provide new insights on early hominin palaeoenvironments. These trace fossils include: Fictovichnus gobiensis, Coprinisphaera murguiai, C. kheprii, Coprinisphaera ispp., Quirogaichnus isp., Teisseirei linguatus isp. nov., Celliforma ritchiei isp. nov., C. spirifer, C. germanica, C. cfr. curvata, Celliforma ispp., Rosellichnus isp., Vondrichnus planoglobus, Laetolichnus kwekai igen. et isp. nov. and Krausichnidae indet. They reveal that at least one...

Data from: Ecological and spatial patterns associated with diversification of the shrub genus Tetraglochin along Southern-Central Andes (Rosaceae)

Diego Leonel Salariato, Juan Manuel Acosta & Ana María Cialdella
In addition to the degree of geographical isolation (sympatry, parapatry, allopatry and peripatry), ecology can be an important factor promoting diversification of lineages, both by niche divergence as well as niche conservatism. Tetraglochin is a genus of shrubs with six species distributed along the Southern and Central Andes, from Peru to southern Argentina and central Chile. Although monophyly of the genus as the identity of its species are well established, spatiotemporal framework for its diversification...

Data from: Early evolutionary differentiation of morphological variation in the mandible of South American caviomorph rodents (Rodentia, Caviomorpha)

Alicia Álvarez, Sergio I Perez & Diego H Verzi
Caviomorphs are a clade of South American rodents recorded at least since the early Oligocene (>31.5 Ma) that exhibit ample eco-morphological variation. It has been proposed that phylogenetic structure is more important than ecological factors for understanding mandibular shape variation in this clade. This was interpreted as a result of the long-standing evolutionary history of caviomorphs and the early divergence of major lineages. In this work we test this hypothesis through analysis of morphological variation...

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