17 Works

Data from: Cryptic species diversity reveals biogeographic support for the ‘mountain passes are higher in the tropics’ hypothesis

Brian A. Gill, B. C. Kondratieff, K. L. Casner, A. C. Encalada, A. S. Flecker, D. G. Gannon, C. K. Ghalambor, J. M. Guayasamin, N. L. Poff, M. P. Simmons, S. A. Thomas, K. R. Zamudio & W. C. Funk
The ‘mountain passes are higher in the tropics’ (MPHT) hypothesis posits that reduced climate variability at low latitudes should select for narrower thermal tolerances, lower dispersal and smaller elevational ranges compared with higher latitudes. These latitudinal differences could increase species richness at low latitudes, but that increase may be largely cryptic, because physiological and dispersal traits isolating populations might not correspond to morphological differences. Yet previous tests of the MPHT hypothesis have not addressed cryptic...

Raw allelic matrix and supplementary materials: Origin and dispersion pathways of guava in the Galapagos Islands inferred through genetics and historical records

Diego Urquia, Bernardo Gutierrez, Gabriela Pozo, Maria Jose Pozo & Maria De Lourdes Torres
Guava (Psidium guajava) is an aggressive invasive plant in the Galapagos Islands. Determining its provenance and genetic diversity could explain its adaptability and spread, and how this relates to past human activities. With this purpose, we analyzed 11 SSR markers in guava individuals from Isabela, Santa Cruz, San Cristobal and Floreana islands in the Galapagos, as well as from mainland Ecuador. The mainland guava population appeared genetically differentiated from the Galapagos populations, with higher genetic...

Data from: New host and lineage diversity of avian haemosporidia in the Northern Andes

Ryan J. Harrigan, Raul Sedano, Anthony C. Chasar, Jaime A. Chaves, Jennifer T. Nguyen, Alexis Whitaker & Thomas B. Smith
The northern Andes, with their steep elevational and climate gradients, are home to an exceptional diversity of flora and fauna, particularly rich in avian species that have adapted to divergent ecological conditions. With this diversity comes the opportunity for parasites to exploit a wide breadth of avian hosts. However, little research has focused on examining the patterns of prevalence and lineage diversity of avian parasites in the Andes. Here, we screened a total of 428...

Data from: The ecology and evolution of seed predation by Darwin's finches on Tribulus cistoides on the Galápagos Islands

Sofía Carvajal-Endara, Andrew P. Hendry, Nancy C. Emery, Corey P. Neu, Diego Carmona, Kiyoko M. Gotanda, T. Jonathan Davies, Jaime A. Chaves & Marc T. J Johnson
Predator-prey interactions play a key role in the evolution of species traits through antagonistic coevolutionary arms-races. The evolution of beak morphology in the Darwin’s finches in response to competition for seed resources is a classic example of evolution by natural selection. The seeds of Tribulus cistoides are an important food source for the largest ground finch species (Geospiza fortis, G. magnirostris, and G. conirostris) in dry months, and the hard spiny morphology of the fruits...

Data from: Diversification across the New World within the ‘blue’ cardinalids (Aves: Cardinalidae)

, Jaime Chaves, Brian Tilston Smith, Matthew J. Miller, Kevin Winker, Jorge L. Pérez-Emán, John Klicka & Robert W. Bryson
Aim: To examine the history of diversification of ‘blue’ cardinalids (Cardinalidae) across North and South America. Location: North America (including Middle America) and South America. Methods: We collected 163 individuals of the 14 species of blue cardinalids and generated multilocus sequence data (3193 base pairs from one mitochondrial and three nuclear genes) to infer phylogeographical structure and reconstruct time-calibrated species trees. We then estimated the ancestral range at each divergence event and tested for temporal...

Data from: Genetic diversity and gene flow decline with elevation in montane mayflies

Nicholas R. Polato, Miranda M. Gray, Brian A. Gill, C. Guilherme Becker, K.L. Casner, Alex S. Flecker, Boris C. Kondratief, Andrea C. Encalada, N. LeRoy Poff, W. Chris Funk & Kelly R. Zamudio
Montane environments around the globe are biodiversity ‘hotspots’ and important reservoirs of genetic diversity. Montane species are also typically more vulnerable to environmental change than their low-elevation counterparts due to restricted ranges and dispersal limitations. Here we focus on two abundant congeneric mayflies (Baetis bicaudatus and B. tricaudatus) from montane streams over an elevation gradient spanning 1400 m. Using single-nucleotide polymorphism genotypes, we measured population diversity and vulnerability in these two species by: (i) describing...

Data from: Natal foraging philopatry in eastern Pacific hawksbill turtles

Alexander R. Gaos, Rebecca L. Lewison, Michael P. Jensen, Michael J. Liles, Ana Henriquez, Sofia Chavarria, Carlos Mario Pacheco, Melissa Valle, David Melero, Velkiss Gadea, Eduardo Altamirano, Perla Torres, Felipe Vallejo, Cristina Miranda, Carolina LeMarie, Jesus Lucero, Karen Oceguera, Didiher Chacón, Luis Fonseca, Marino Abrego, Jeffrey A. Seminoff, Eric E. Flores, Israel Llamas, Rodrigo Donadi, Bernardo Peña … & Daniela Alarcón Ruales
The complex processes involved with animal migration have long been a subject of biological interest and broad-scale movement patterns of many marine turtle populations still remain unresolved. While it is widely accepted that once marine turtles reach sexual maturity they home to natal areas for nesting or reproduction, the role of philopatry to natal areas during other life stages has received less scrutiny, despite widespread evidence across the taxa. Here we report on genetic research...

Phylogenomic discordance in the Eared Seals is best explained by incomplete lineage sorting following explosive radiation in the Southern Hemisphere

Fernando Lopes, Larissa Oliveira, Amanda Kessler, Yago Beux, Enrique Crespo, Susana Cárdenas-Alayza, Patricia Majluf, Maritza Sepulveda, , Valentina Franco-Trecu, Diego Paez-Rosas, Jaime Chaves, Carolina Loch, Bruce Robertson, Karina Acevedo-Whitehouse, Fernando Elorriaga-Verplancken, Stephen Kirkman, Claire Peart, Jochen Wolf & Sandro Bonatto
The phylogeny and systematics of fur seals and sea lions (Otariidae) have long been studied with diverse data types, including an increasing amount of molecular data. However, only a few phylogenetic relationships have reached acceptance pointing at strong gene-tree species tree discordance. Divergence times in the group also vary largely between studies. These uncertainties impeded the understanding of the biogeographical history of the group, such as when and how trans-equatorial dispersal and subsequent speciation events...

Data from: Thermoregulatory windows in Darwin's finches

Glenn J. Tattersall, Jaime A. Chaves & Raymond M. Danner
1. Darwin’s finches have been the focus of intense study demonstrating how climatic fluctuations coupled with resource competition drive the evolution of a variety of bill sizes and shapes. The bill, as other peripheral surfaces, also plays an important role in thermoregulation in numerous bird species. The avian bill is vascularized, while limbs have specialized vasculature that facilitate heat loss or heat conservation (i.e., they are thermoregulatory windows). 2. The Galápagos Islands, home to Darwin’s...

Data from: Complex coevolution of wing, tail, and vocal sounds of courting male bee hummingbirds

Christopher J. Clark, Jimmy A. McGuire, Elisa Bonaccorso, Jacob S. Berv & Richard O. Prum
Phenotypic characters with a complex physical basis may have a correspondingly complex evolutionary history. Males in the ‘bee’ hummingbird clade court females with sound from tail-feathers, which flutter during display dives. On a phylogeny of 35 species, flutter sound frequency evolves as a gradual, continuous character on most branches. But on at least six internal branches fall two types of major, saltational changes: mode of flutter changes, or the feather that is the sound source...

Shade-growing practices lessen the impact of coffee plantations on multiple dimensions of ant diversity

Javier Ibarra-Isassi, Tanya Handa, Anderson Arenas-Clavijo, Selene Escobar-Ramirez, Inge Armbrecht & Jean-Philippe Lessard
1. Land use management influence changes in biodiversity beyond the targeted species. Management practices in coffee plantations have shifted from coffee growing below accompanying (shade) trees, to intensified monocultures in which coffee grows fully exposed to the sun. Anthropogenic disturbance causes changes in species composition relative to adjacent natural patches and reduces their biotic heterogeneity. Here, we assessed the impact of coffee plantation management practices on the taxonomical, phylogenetic, and functional composition of ant communities,...

Urbanization alters interactions between Darwin’s finches and Tribulus cistoides on the Galápagos Islands

Ruth Rivkin, Reagan Johnson, Jaime Chaves & Marc Johnson
Emerging evidence suggests that humans shape the ecology and evolution of species interactions. Islands are particularly susceptible to anthropogenic disturbance due to the fragility of their ecosystems; however, we know little about the susceptibility of species interactions to urbanization on islands. To address this gap, we studied how the earliest stages of urban development affect interactions between Darwin’s finches and its key food resource, Tribulus cistoides, in three towns on the Galápagos Islands. We measured...

Data from: Globally consistent impact of tropical cyclones on the structure of tropical and subtropical forests

Thomas Ibanez, Gunnar Keppel, Christophe Menkes, Thomas W. Gillespie, Matthieu Lengaigne, Morgan Mangeas, Gonzalo Rivas-Torres & Philippe Birnbaum
1. Tropical cyclones (TCs) are large-scale disturbances that regularly impact tropical forests. Although long-term impacts of TCs on forest structure have been proposed, a global test of the relationship between forest structure and TC frequency and intensity is lacking. We test on a pantropical scale whether TCs shape the structure of tropical and subtropical forests in the long-term. 2. We compiled forest structural features (stem density, basal area, mean canopy height and maximum tree size)...

Data from: Climate variability predicts thermal limits of aquatic insects across elevation and latitude

Alisha A. Shah, Brian A. Gill, Andrea C. Encalada, Alexander S. Flecker, W. Chris Funk, Juan M. Guayasamin, Boris C. Kondratieff, N. LeRoy Poff, Steven A. Thomas, Kelly R. Zamudio & Cameron K. Ghalambor
Janzen's extension of the climate variability hypothesis posits that increased seasonal variation at high latitudes should result in greater temperature overlap across elevations, and favor wider thermal breadths in temperate organisms compared to their tropical counterparts. We tested these predictions by measuring stream temperatures and thermal breadths (i.e. the difference between the critical thermal maximum and minimum) of 62 aquatic insect species from temperate (Colorado, USA) and tropical (Papallacta, Ecuador) streams spanning an elevation gradient...

Data from: Biotic and abiotic variables influencing plant litter breakdown in streams: a global study

Luz Boyero, Richard Pearson, Cang Hui, Mark Gessner, Javier Perez, Markos Alexandrou, Manuel Graça, Bradley Cardinale, Ricardo Albariño, M. Arunachalam, Leon Barmuta, Andrew Boulton, Andreas Bruder, Marcos Callisto, Eric Chauvet, Russell Death, David Dudgeon, Andrea Encalada, Veronica Ferreira, Ricardo Figueroa, Alex Flecker, , Julie Helson, Tomoya Iwata, Tajang Jinggut … & Catherine Yule
Plant litter breakdown is a key ecological process in terrestrial and freshwater ecosystems. Streams and rivers, in particular, have high rates of carbon dioxide evasion and they contribute substantially to global carbon fluxes. However, there is little information available on the relative roles of different drivers of plant litter breakdown in fresh waters, particularly at large scales. We present a global-scale study of litter breakdown in streams to compare the roles of biotic, climatic and...

Data from: Extensive hybridization between two Andean warbler species with shallow divergence in mtDNA

Laura Céspedes-Arias, Andrés Cuervo, Elisa Bonaccorso, Marialejandra Castro-Farias, Alejandro Mendoza-Santacruz, Jorge Pérez-Emán, Christopher Witt & Daniel Cadena
Studying processes acting on differentiated populations upon secondary contact, such as hybridization, is important to comprehensively understand how species are formed and maintained over time. However, avian speciation studies in the tropical Andes have largely focused on the role of topographic and ecological barriers promoting divergence in allopatry, seldom examining hybridization and introgression. We describe a hybrid zone involving 2 closely related Andean warblers (Parulidae), the Golden-fronted Redstart (Myioborus ornatus) and the Spectacled Redstart (Myioborus...

Temporally varying disruptive selection in the medium ground finch (Geospiza fortis).

Marc-Olivier Beausoleil, Luke Frishkoff, Leithen M'Gonigle, Joost Raeymaekers, Sarah Knutie, Luis De León, Sarah Huber, Jaime Chaves, Dale Clayton, Jennifer Koop, Jeffrey Podos, Diana Sharpe, Andrew Hendry & Rowan Barrett
Disruptive natural selection within populations exploiting different resources is considered to be a major driver of adaptive radiation and the production of biodiversity. Fitness functions, which describe the relationships between trait variation and fitness, can help to illuminate how this disruptive selection leads to population differentiation. However, a single fitness function represents only a particular selection regime over a single specified time period (often a single season or a year), and therefore might not capture...

Registration Year

  • 2021
    3
  • 2020
    2
  • 2019
    2
  • 2018
    1
  • 2017
    5
  • 2016
    2
  • 2014
    1
  • 2013
    1

Resource Types

  • Dataset
    17

Affiliations

  • Universidad San Francisco de Quito
    17
  • Cornell University
    4
  • McGill University
    2
  • University of Miami
    2
  • National Oceanic and Atmospheric Administration
    2
  • University of Toronto
    2
  • Colorado State University
    2
  • University of the Basque Country
    1
  • University of Quebec at Montreal
    1
  • University of Massachusetts Amherst
    1