103 Works

Reintroduced grazers and prescribed fire effects on beetle assemblage structure and function in restored grasslands

Nicholas Barber, Melissa Nelson, Sheryl Hosler, Fabian Boetzl & Holly Jones
Ecological restoration seeks to re-establish functioning ecosystems, but planning and evaluation often focus on taxonomic community structure and neglect consumers and their functional roles. The functional trait composition of insect assemblages, which make up the majority of animal diversity in many systems, can reveal how they are affected by restoration management and the consequences for ecosystem function. We sampled ground beetle (Coleoptera: Carabidae) assemblages in restored tallgrass prairies varying in management with prescribed fire and...

Data from: Pre-infection effects of nectar secondary compounds on a bumble bee gut pathogen

Kristen Michaud, Rebecca Irwin, Nicholas Barber & Lynn Adler
Bumble bee pollinators can be exposed to pathogens when foraging on flowers previously visited by infected individuals. Infectious cells may be deposited in floral nectar, providing a site for pathogens to interact with nectar secondary compounds prior to infecting bees. Some nectar secondary compounds can reduce pathogen counts in infected bumble bees, but we know less about how exposure to these compounds directly affects pathogens prior to being ingested by their host. We exposed the...

Data from: Rate heterogeneity across Squamata, misleading ancestral state reconstruction and the importance of proper null model specification

Sean Harrington & Tod W. Reeder
The binary-state speciation and extinction (BiSSE) model has been used in many instances to identify state-dependent diversification and reconstruct ancestral states. However, recent studies have shown that the standard procedure of comparing the fit of the BiSSE model to constant-rate birth–death models often inappropriately favours the BiSSE model when diversification rates vary in a state-independent fashion. The newly developed HiSSE model enables researchers to identify state-dependent diversification rates while accounting for state-independent diversification at the...

Data from: New species in the Sitalcina sura species group (Opiliones, Laniatores, Phalangodidae), with evidence for a biogeographic link between California desert canyons and Arizona sky islands

Angela DiDomenico & Marshal Hedin
The western United States is home to numerous narrowly endemic harvestman taxa (Arachnida, Opiliones), including members of the genus Sitalcina Banks, 1911. Sitalcina is comprised of three species groups, including the monospecific S. californica and S. lobata groups, and the S. sura group with eight described species. All species in the S. sura group have very small geographic distributions, with group members distributed like disjunct “beads on a string” from Monterey south to southern California...

Data from: Rapid diversification of sexual signals in Hawaiian Nesosydne planthoppers (Hemiptera: Delphacidae): the relative role of neutral and selective forces

Kari Roesch Goodman, J. Patrick Kelley, Stephen Welter, George K. Roderick, Damian O. Elias & S. C. Welter
Changes in sexual signals have the potential to promote rapid divergence and reproductive isolation among populations of animals. Thus, identifying processes contributing to variation in signals is key to understanding the drivers of speciation. However, it is difficult to identify the processes initiating changes in signals in empirical systems because (1) the demographic history of populations under study is usually unclear, and (2) there is no unified hypothesis-testing framework for evaluating the simultaneous contribution of...

Data from: Song evolution, speciation, and vocal learning in passerine birds

Nicholas A. Mason, Kevin J. Burns, Joseph A. Tobias, Santiago Claramunt, Nathalie Seddon & Elizabeth Perrault Derryberry
Phenotypic divergence can promote reproductive isolation and speciation, suggesting a possible link between rates of phenotypic evolution and the tempo of speciation at multiple evolutionary scales. To date, most macroevolutionary studies of diversification have focused on morphological traits, whereas behavioral traitsࣧincluding vocal signalsࣧare rarely considered. Thus, although behavioral traits often mediate mate choice and gene flow, we have a limited understanding of how behavioral evolution contributes to diversification. Furthermore, the developmental mode by which behavioral...

Data from: Using viromes to predict novel immune proteins in non-model organisms

Steven D. Quistad, Yan Wei Lim, Genivaldo Gueiros Z. Silva, Craig E. Nelson, Andreas F. Haas, Linda Wegley Kelly, Robert A. Edwards & Forest L. Rohwer
Immunity is mostly studied in a few model organisms, leaving the majority of immune systems on the planet unexplored. To characterize the immune systems of non-model organisms alternative approaches are required. Viruses manipulate host cell biology through the expression of proteins that modulate the immune response. We hypothesized that metagenomic sequencing of viral communities would be useful to identify both known and unknown host immune proteins. To test this hypothesis, a mock human virome was...

Data from: Herbivore impacts on marsh production depend upon a compensatory continuum mediated by salinity stress

Jeremy D. Long & Laura D. Porturas
Plant communities are disturbed by several stressors and they are expected to be further impacted by increasing anthropogenic stress. The consequences of these stressors will depend, in part, upon the ability of plants to compensate for herbivory. Previous studies found that herbivore impacts on plants can vary from negative to positive because of environmental control of plant compensatory responses, a.k.a. the Compensatory Continuum Hypothesis. While these influential studies enhanced our appreciation of the dynamic nature...

Allometric modelling of plant biomass from drone-acquired photographs: drone images, ground control marker coordinates and biomass data from 36 sites, 2016-2020

A. Cunliffe, K. Anderson, F. Boschetti, H. Graham, R. Brazier, I. Myers-Smith, T. Astor, M. Boer, L. Calvo, P. Clark, M. Cramer, M. Encinas-Lara, S. Escarzaga, J. Fernández-Guisuraga, A. Fisher, K. Gdulová, B. Gillespie, A. Griebel, N. Hanan, M. Hanggito, S. Haselberger, C. Havrilla, W. Ji, J. Karl, M. Kirchhoff … & R. Wojcikiewicz
This dataset contains RGB photographs acquired from drone surveys. There are 741 harvest plots from 38 surveys at 36 sites around the world. Each site was approximately 1 ha in area. Included with the photographic images are the coordinates of ground control markers, biomass, taxonomic and location data for harvest plots and ancillary metadata. The observations can be used to obtain allometric size-biomass models. This work was supported by the Natural Environment Research Council award...

Data from: Sierra Nevada mountain lake microbial communities are structured by temperature, resources, and geographic location

Marika Schulhof, Andrew Allen, Eric Allen, Natalie Mladenov, John McCrow, Natalie Jones, Jessica Blanton, Hamanda Badona Cavalheri, Drishti Kaul, Celia Symons & Jonathan Shurin
Warming, eutrophication (nutrient fertilization) and brownification (increased loading of allochthonous organic matter) are three global trends impacting lake ecosystems. However, the independent and synergistic effects of resource addition and warming on autotrophic and heterotrophic microorganisms are largely unknown. In this study, we investigate the independent and interactive effects of temperature, dissolved organic carbon (DOC, both allochthonous and autochthonous), and nitrogen (N) supply, in addition to the effect of spatial variables, on the composition, richness, and...

Data from: Flowering plant composition shapes pathogen infection intensity and reproduction in bumble bee colonies

Nicholas Barber, Lynn Adler, Olivia Biller & Rebecca Irwin
Pathogens pose significant threats to pollinator health and food security. Pollinators can transmit diseases during foraging, but the consequences of plant species composition for infection is unknown. In agroecosystems, flowering strips or hedgerows are often used to augment pollinator habitat. We used canola as a focal crop in tents, and manipulated flowering strip composition using plant species we had previously shown to result in higher or lower bee infection in short-term trials. We also manipulated...

Pleistocene glacial cycles drove lineage diversification and fusion in the Yosemite toad (Anaxyrus canorus)

Paul A. Maier, Amy G. Vandergast, Steven M. Ostoja, Andres Aguilar & Andrew J. Bohonak
Pleistocene glacial cycles drove lineage diversification and fusion in the Yosemite toad (Anaxyrus canorus) Species endemic to alpine environments can evolve via steep ecological selection gradients between lowland and upland environments. Additionally, many alpine environments have faced repeated glacial episodes over the past two million years, fracturing these endemics into isolated populations. In this “glacial pulse” model of alpine diversification, cycles of allopatry and ecologically divergent glacial refugia play a role in generating biodiversity, including...

Data from: The effects of temperature on the defensive strikes of rattlesnakes

Malachi D. Whitford, Grace A. Freymiller, Timothy E. Higham & Rulon W. Clark
Movements of ectotherms are constrained by their body temperature owing to the effects of temperature on muscle physiology. As physical performance often affects the outcome of predator–prey interactions, environmental temperature can influence the ability of ectotherms to capture prey and/or defend themselves against predators. However, previous research on the kinematics of ectotherms suggests that some species may use elastic storage mechanisms when attacking or defending, thereby mitigating the effects of sub-optimal temperature. Rattlesnakes (Crotalus spp.)...

Data matrices for: Phylogenomics of peacock spiders and their kin (Salticidae, Maratus), with implications for the evolution of male courtship displays

Damian Elias & Marshal Hedin
Understanding diversity has been a pursuit in evolutionary biology since its inception. A challenge arises when sexual selection has played a role in diversification. Questions of what constitutes a “species”, homoplasy versus synapomorphy, and whether sexually-selected traits show phylogenetic signal have hampered work on many systems. Peacock spiders are famous for sexually selected male courtship dances and peacock-like abdominal ornamentation. This lineage of jumping spiders currently includes over 90 species classified into two genera, Maratus...

Neurovascular evidence for a co-occurrence of teeth and baleen in an Oligocene mysticete and the transition to filter-feeding in baleen whales

Eric Ekdale & Thomas Deméré
Extant baleen whales (Mysticeti) have a deciduous foetal dentition, but are edentulous at birth. Fossils reveal that the earliest mysticetes possessed an adult dentition. Aetiocetids, a diverse clade of Oligocene toothed mysticetes, have a series of small palatal foramina and associated sulci medial to the postcanine dentition. The openings have been homologized with lateral palatal foramina that transmit neurovascular structures to baleen in extant mysticetes, thereby implying a co-occurrence of teeth and baleen in aetiocetids....

Pairing functional connectivity with population dynamics to prioritize corridors for Southern California spotted owls

Erin Conlisk, Emily Haeuser, Alan Flint, Rebecca Lewison & Megan Jennings
Aim: Land use change, climate change, and shifts to disturbance regimes make successful wildlife management challenging, particularly when ongoing urbanization constrains habitat and movement. Preserving and maintaining landscape connectivity is a potential strategy to support wildlife responding to these stressors. Using a novel model framework, we determined the population-level benefit of a set of identified potential corridors for spotted owl population viability. Location: Southern California, United States. Methods: Combining habitat suitability and dynamic metapopulation models,...

Data from: When one phenotype is not enough - divergent evolutionary trajectories govern venom variation in a widespread rattlesnake species

Giulia Zancolli, Juan J. Calvete, Michael D. Cardwell, Harry W. Greene, William K. Hayes, Matthew J. Hegarty, Hans-Werner Herrmann, Andrew T. Holycross, Dominic I. Lannutti, John F. Mulley, Libia Sanz, Zachary D. Travis, Joshua R. Whorley, Catharine E. Wüster & Wolfgang Wuster
Understanding the origin and maintenance of phenotypic variation, particularly across a continuous spatial distribution, represents a key challenge in evolutionary biology. For this, animal venoms represent ideal study systems: they are complex, variable, yet easily quantifiable molecular phenotypes with a clear function. Rattlesnakes display tremendous variation in their venom composition, mostly through strongly dichotomous venom strategies, which may even coexist within single species. Here, through dense, widespread population-level sampling of the Mojave rattlesnake, Crotalus scutulatus,...

Data from: A stable phylogenomic classification of Travunioidea (Arachnida, Opiliones, Laniatores) based on sequence capture of ultraconserved elements

Shahan Derkarabetian, James Starrett, Nobuo Tsurusaki, Darrell Ubick, Stephanie Castillo & Marshal Hedin
Molecular phylogenetics has transitioned into the phylogenomic era, with data derived from next-generation sequencing technologies allowing unprecedented phylogenetic resolution in all animal groups, including understudied invertebrate taxa. Within the most diverse harvestmen suborder, Laniatores, most relationships at all taxonomic levels have yet to be explored from a phylogenomics perspective. Travunioidea is an early-diverging lineage of laniatorean harvestmen with a Laurasian distribution, with species distributed in eastern Asia, eastern and western North America, and south-central Europe....

Data from: New insights into New World biogeography: an integrated view from the phylogeny of blackbirds, cardinals, sparrows, tanagers, warblers, and allies

F. Keith Barker, Kevin J. Burns, John Klicka, Scott M. Lanyon & Irby J. Lovette
Understanding the biogeographic origins and temporal sequencing of groups within a region or of lineages within an ecosystem can yield important insights into evolutionary dynamics and ecological processes. Fifty years ago, Ernst Mayr generated comprehensive—if limited—inferences about the origins of the New World avifaunas, including the importance of pre-Isthmian dispersal between North and South America. Since then, methodological advances have improved our ability to address many of the same questions, but the phylogenies upon which...

Data from: Species delimitation using Bayes factors: simulations and application to the Sceloporus scalaris species group (Squamata: Phrynosomatidae)

Jared A. Grummer, , Tod W. Reeder & Robert W. Bryson
Current molecular methods of species delimitation are limited by the types of species delimitation models and scenarios that can be tested. Bayes factors allow for more flexibility in testing non-nested species delimitation models and hypotheses of individual assignment to alternative lineages. Here, we examined the efficacy of Bayes factors in delimiting species through simulations and empirical data from the Sceloporus scalaris species group. Marginal likelihood scores of competing species delimitation models, from which Bayes factor...

Data from: Alcoholism gender differences in brain responsivity to emotional stimuli

Kayle S Sawyer, Nasim Maleki, Trinity Urban, Marinkovic Ksenija, Karson Steven, Susan Mosher Ruiz, Gordon J Harris & Marlene Oscar-Berman
Men and women may use alcohol to regulate emotions differently, with corresponding differences in neural responses. We explored how the viewing of different types of emotionally salient stimuli impacted brain activity observed through functional magnetic resonance imaging (fMRI) from 42 long-term abstinent alcoholic (25 women) and 46 nonalcoholic (24 women) participants. Analyses revealed blunted brain responsivity in alcoholic compared to nonalcoholic groups, as well as gender differences in those activation patterns. Brain activation in alcoholic...

Data from: Before platelets: the production of platelet activating factor during growth and stress in a basal marine organism

Ines Galtier D’Auriac, Robert A. Quinn, Heather Maughan, Louis-Felix Nothias, Mark Little, Clifford A. Kapono, Ana Cobian Guemes, Brandon T. Reyes, Kevin Green, Steven D. Quistad, Matthieu Leray, Jennifer E. Smith, Pieter C. Dorrestein, Forest Rohwer, Dimitri D. Deheyn, Aaron C. Hartmann, Ana Cobian & Ines Galtier D'Auriac
Corals and humans represent two extremely disparate metazoan lineages and are therefore useful for comparative evolutionary studies. Two lipid-based molecules that are central to human immunity, platelet activating factor (PAF) and Lyso-PAF were recently identified in scleractinian corals. To identify processes in corals that involve these molecules, PAF and Lyso-PAF biosynthesis was quantified in conditions known to stimulate PAF production in mammals (tissue growth and exposure to elevated levels of ultraviolet light) and in conditions...

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...

Data from: Three new species in the harvestmen genus Acuclavella (Opiliones, Dyspnoi, Ischyropsalidoidea), including description of male Acuclavella quattuor Shear 1986.

Casey H. Richart, Marshal Hedin & Casey Richart
In Shear’s 1986 cladistic analysis of the Ischyropsalidoidea, he described the new genus Acuclavella including four new species from the Pacific Northwest states of Washington and Idaho. Several of these species descriptions were based on very limited sample sizes. Our recent field work has increased by more than an order of magnitude both the number of specimens and known localities for Acuclavella. We use this new material to interpret species limits in Acuclavella using morphometric...

Data from: Pleistocene climatic fluctuations drive isolation and secondary contact in the red diamond rattlesnake (Crotalus ruber) in Baja California

Sean M. Harrington, Bradford D. Hollingsworth, Timothy E. Higham & Tod W. Reeder
Aim: Many studies have investigated the phylogeographic history of species on the Baja California Peninsula, and they often show one or more genetic breaks that are spatially concordant among many taxa. These phylogeographic breaks are commonly attributed to vicariance as a result of geological or climatic changes, followed by secondary contact when barriers are no longer present. We use restriction-site associated DNA sequence data and a phylogeographic model selection approach to explicitly test the secondary...

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  • San Diego State University
  • University of California, Davis
  • University of California System
  • University of Washington
  • University of California, Riverside
  • Smithsonian Institution
  • United States Geological Survey
  • Harvard University
  • The University of Texas at El Paso
  • Oregon State University