16 Works

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: The fluctuating resource hypothesis explains invasibility, but not exotic advantage following disturbance

Dean E. Pearson, Yvette K. Ortega, Diego Villarreal, Ylva Lekberg, Marina C. Cock, Ozkan Eren & Jose L. Hierro
Invasibility is a key indicator of community susceptibility to changes in structure and function. The fluctuating resource hypothesis (FRH) postulates that invasibility is an emergent community property, a manifestation of multiple processes that cannot be reliably predicted by individual community attributes like diversity or productivity. Yet, research has emphasized the role of these individual attributes, with the expectation that diversity should deter invasibility and productivity enhance it. In an effort to explore how these and...

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: New remains of the aquatic turtle Hydromedusa casamayorensis (Pleurodira, Chelidae) from the middle Eocene of Patagonia: taxonomic validation and phylogenetic relationships

Ignacio J. Maniel, Marcelo S. De La Fuente, Juliana Sterli, Juan M. Jannello & J. Marcelo Krause
Twenty- seven new specimens recovered from lower levels of the Sarmiento Formation (Casamayoran SALMA, middle Eocene) in the ¨Cañadón Hondo¨ area, Chubut (Argentina), bring new information on the Palaeogene long-necked chelid Hydromedusa casamayorensis.The discovery of cranial and postcranial remains allows a complete description of the only known extinct species of the genus Hydromedusa recognizing diagnostic characters that revalidate the taxonomic status of this species. Hydromedusa casamayorensis is incorporated into a cladistic framework of chelid turtles....

Data from: Evolution of morphological integration in the skull of Carnivora (Mammalia): changes in Canidae lead to increased evolutionary potential of facial traits

Fabio Andrade Machado, Thiago Macek Gonçalves Zahn & Gabriel Marroig
Morphological integration refers to the fact that different phenotypic traits of organisms are not fully independent from each other, and tend to covary to different degrees. The covariation among traits is thought to reflect properties of the species' genetic architecture and thus can have an impact on evolutionary responses. Furthermore, if morphological integration changes along the history of a group, inferences of past selection regimes might be problematic. Here we evaluated the stability and evolution...

Data from: The rise of the ruling reptiles and ecosystem recovery from the Permian-Triassic mass extinction

Martín D. Ezcurra & Richard J. Butler
One of the key faunal transitions in Earth history occurred after the Permo-Triassic mass extinction (ca. 252.2 Ma), when the previously obscure archosauromorphs (which include crocodylians, dinosaurs, and birds) become the dominant terrestrial vertebrates. Here, we place all known middle Permian–early Late Triassic archosauromorph species into an explicit phylogenetic context, and quantify biodiversity change through this interval. Our results indicate the following sequence of diversification: a morphologically conservative and globally distributed post-extinction ‘disaster fauna’; a...

Data from: Genetic signals of artificial and natural dispersal linked to colonization of South America by non-native Chinook salmon (Oncorhynchus tshawytscha)

Daniel Gomez-Uchida, Diego Cañas-Rojas, Carla M. Riva-Rossi, Javier E. Ciancio, Miguel A. Pascual, Billy Ernst, Eduardo Aedo, Selim S. Musleh, Francisca Valenzuela-Aguayo, Thomas P. Quinn, James E. Seeb & Lisa W. Seeb
Genetics data have provided unprecedented insights into evolutionary aspects of colonization by non-native populations. Yet, our understanding of how artificial (human-mediated) and natural dispersal pathways of non-native individuals influence genetic metrics, evolution of genetic structure, and admixture remains elusive. We capitalize on the widespread colonization of Chinook salmon Oncorhynchus tshawytscha in South America, mediated by both dispersal pathways, to address these issues using data from a panel of polymorphic SNPs. First, genetic diversity and the...

Data from: Hybridization could be a common phenomenon within the highly diverse lizard genus Liolaemus

Melisa Olave, Luciano J. Avila, , Mariana Morando & Jack W. Sites
Hybridization is likely to occur more often between closely related taxa that have had insufficient time to diverge to the point of reproductive incompatibility; hybridization between deeply divergent lineages is rare. In squamate reptiles, hybridization has been proposed as a possible explanation for the extensive paraphyly observed in mitochondrial gene trees in several species complexes of the South American lizard genus Liolaemus. One of the best-documented cases is within the L. boulengeri and L. rothi...

Data from: The taxonomic utility of micromorphology in Lepidaploa (Vernonieae: Asteraceae)

Danilo Marques, María Betiana Angulo, Jimi Naoki Nakajima & Massimiliano Dematteis
Lepidaploa belongs to tribe Vernonieae, one of the most complex tribes of Asteraceae, and relationships among Lepidaploa and related genera are poorly understood. Microcharacters may be of taxonomic value and used in the identification of different taxonomic categories. [DM1]The morphology of phyllaries, florets and cypselae was analysed in detail for the first time in 23 species of Lepidaploa to evaluate the reliability of microcharacters as taxonomic markers. The results were also discussed in relation to...

Data from: Land use intensity indirectly affects ecosystem services mainly through plant functional identity in a temperate forest

Verónica Chillo, Diego P. Vázquez, Mariano M. Amoroso & Elena M. Bennett
1.Land-use change is known to affect biodiversity, and there is increasing concern regarding how these changes may impact the provision of ecosystem services. Although functional composition (diversity and identity) could influence ecosystem properties and services at the community level, there is little quantitative understanding of these relationships in the field. Here, we evaluate the direct and indirect effects (through ecosystem properties) of biodiversity on the provision of multiple ecosystem services in native mixed forest in...

Data from: A new Palaeocene crocodylian from southern Argentina sheds light on the early history of caimanines

Paula Bona, Martín D. Ezcurra, Francisco Barrios & María V. Fernandez Blanco
Caimanines are crocodylians currently restricted to South and Central America and the oldest members are from lower Palaeocene localities of the Salamanca Formation (Chubut Province, Argentina). We report here a new caimanine from this same unit represented by a skull roof and partial braincase. Its phylogenetic relationships were explored in a cladistic analysis using standard characters and a morphogeometric two-dimensional configuration of the skull roof. The phylogenetic results were used for an event-based supermodel quantitative...

Data from: Revisiting protein aggregation as pathogenic in sporadic Parkinson’s and Alzheimer’s diseases

Alberto J. Espay, Joaquin A. Vizcarra, Luca Marsili, Anthony E. Lang, David K. Simon, Aristide Merola, Keith A. Josephs, Alfonso Fasano, Francesca Morgante, Rodolfo Savica, J. Timothy Greenamyre, Franca Cambi, Tritia R. Yamasaki, Caroline M. Tanner, Ziv Gan-Or, Irene Litvan, Ignacio F. Mata, Cyrus P. Zabetian, Patrik Brundin, Hubert H. Fernandez, David G. Standaert, Marcelo A. Kauffman, Michael A. Schwarzschild, S. Pablo Sardi, Todd Sherer … & James B. Leverenz
The gold standard for a definitive diagnosis of Parkinson’s disease (PD) is the pathologic finding of aggregated alpha-synuclein into Lewy bodies and for Alzheimer’s disease (AD) aggregated amyloid into plaques and hyperphosphorylated tau into tangles. Implicit in this clinico-pathologic-based nosology is the assumption that pathological protein aggregation at autopsy reflect pathogenesis at disease onset. While these aggregates may in exceptional cases be on a causal pathway in humans (e.g., aggregated alpha-synuclein in SNCA gene multiplication...

Data from: Morphological datasets fit a common mechanism much more poorly than DNA sequences and call into question the Mkv model

Pablo A. Goloboff, Michael Pittman, Diego Pol & Xing Xu
The Mkv evolutionary model, based on minor modifications to models of molecular evolution, is being increasingly used to infer phylogenies from discrete morphological data, often producing different results from parsimony. The critical difference between Mkv and parsimony is the assumption of a “common mechanism” in the Mkv model, with branch lengths determining that probability of change for all characters increases or decreases at the same tree branches by the same exponential factor. We evaluate whether...

Data from: The oldest sigmodontine rodent revisited and the age of the first South American cricetids

Franck Barbière, Pablo E. Ortiz & Ulyses F.J. Pardiñas
New fossil material of Auliscomys formosus Reig 1978 allows restudy of the oldest known South American representative of the subfamily Sigmodontinae, Auliscomys formosus was based on a fragmentary dentary exhumed from the Monte Hermoso Formation of central Argentina. Previous studies allocated A. formosus to the early Pliocene. A revaluation of dental and cranial morphology, including for the first time the upper dentition, and the inclusion of A. formosus in a phylogenetic analysis of the tribe...

Data from: Isotopic evidence for oligotrophication of terrestrial ecosystems

Joseph M. Craine, Andrew J. Elmore, Lixin Wang, Julieta Aranibar, Marijn Bauters, Pascal Boeckx, Brooke E. Crowley, Melissa A. Dawes, Sylvain Delzon, Alex Fajardo, Yunting Fang, Lei Fujiyoshi, Alan Gray, Rossella Guerrieri, Michael J. Gundale, David J. Hawke, Peter Hietz, Mathieu Jonard, Elizabeth Kearsley, Tanaka Kenzo, Mikhail Makarov, Sara Marañón-Jiménez, Terrence P. McGlynn, Brenden E. McNeil, Stella G. Mosher … & Katarzyna Zmudczyńska-Skarbek
Human societies depend on an Earth System that operates within a constrained range of nutrient availability, yet the recent trajectory of terrestrial nitrogen (N) availability is uncertain. Examining patterns of foliar N concentrations ([N]) and isotope ratios (15N) from more than 42,000 samples acquired over 37 years, here we show that foliar [N] declined by 8% and foliar 15N declined by 0.8 – 1.9 ‰. Examining patterns across different climate spaces, foliar 15N declined across...

Data from: Assessing bottom-trawling impacts based on the longevity of benthic invertebrates

Jan Geert Hiddink, Simon Jennings, Marija Sciberras, Stefan Bolam, Giulia Cambie, Robert McConnaughey, Tessa Mazor, Ray Hilborn, Jeremy Collie, C. Roland Pitcher, Ana Parma, Petri Suuronen, Michel Kaiser, Adriaan Rijnsdorp, Jeremy S. Collie, Michel J. Kaiser, Adriaan D. Rijnsdorp & Robert A. McConnaughey
1. Bottom trawling is the most widespread human activity directly affecting seabed habitats. Assessment and effective management of the effects of bottom trawling at the scale of fisheries requires an understanding of differences in sensitivity of biota to trawling. Responses to disturbance are expected to depend on the intrinsic rate of increase of populations (r), which is expected to be linearly related to the reciprocal of longevity. 2. We examine the relationship between the longevity...

Registration Year

  • 2018

Resource Types

  • Dataset


  • National Scientific and Technical Research Council
  • University of Washington
  • University of Cincinnati
  • McGill University
  • University of Freiburg
  • Institute of Vertebrate Paleontology and Paleoanthropology
  • Massachusetts General Hospital
  • South African National Biodiversity Institute
  • Bangor University
  • University of Montana