14 Works

Residual force enhancement is reduced in permeabilized fiber bundles from mdm muscles

Kiisa Nishikawa, Dhruv Mishra & Kiisa C Nishikawa
Residual force enhancement (RFE) is the increase in steady-state force after active stretch relative to the force after isometric contraction at the same final length. The mdm mutation in mice, characterized by a small deletion in N2A titin, has been proposed to prevent N2A titin-actin interactions so that active mdm muscles are more compliant than WT. This decrease in active muscle stiffness should be associated with reduced RFE. We investigated RFE in permeabilized soleus (SOL)...

Data from: Kinematic trajectories in response to speed perturbations in walking suggest modular task-level control of leg angle and length

M. Janneke Schwaner, Kiisa Nishikawa & Monica Daley
Abstract Navigating complex terrains requires dynamic interactions between the substrate, musculoskeletal and sensorimotor systems. Current perturbation studies have mostly used visible terrain height perturbations, which do not allow us to distinguish among the neuromechanical contributions of feedforward control, feedback-mediated and mechanical perturbation responses. Here, we use treadmill belt speed perturbations to induce a targeted perturbation to foot speed only, and without terrain-induced changes in joint posture and leg loading at stance onset. Based on previous...

Willow Flycatcher subspecies song discrimination experiment data

Sean Mahoney
Animals use acoustic signals to repel competitors and attract mates, and signal divergence among populations can promote reproductive isolation. Empidonax flycatchers are insectivorous passerine birds distributed across North and Central America that are conservative in plumage but often exhibit differences in song both between and within species. Four subspecies have been recognized within the Willow Flycatcher (Empidonax traillii) and previous analyses have revealed differences in song structure among a subset of these. Using reciprocal playback...

NEON forest and woodland plots: diversity, structure and climate

Christopher Hakkenberg
We combined climate variables with field measurements and airborne lidar from all forest and woodland plots in the National Ecological Observatory Network (NEON) to characterize the role of climate in constraining biodiversity – forest structure relationships across the United States.

Dataset accompanying Buscombe et al.: Human-in-the-loop segmentation of earth surface imagery

Daniel Buscombe, Evan Goldstein, Christopher Sherwood, Cameron Bodine, Jaycee Favela, Sharon Fitzpatrick, Christine Kranenburg, Jin-Si Over, Jenna Brown, Andrew Ritchie, Jonathan Warrick & Phillipe Wernette
The datasets used in this study are provided in 7 folders: “dataset A”, containing data from Sandwich Town Neck Beach on Cape Cod, Massachusetts. These images are published as a USGS data series (Sherwood et al., 2021) are publicly available at https://doi.org/10.5066/P9BFD3YH “dataset B”, containing data from North and South Carolina collected immediately after Hurricane Florence in October 2018. National Geodetic Survey emergency response imagery courtesy of the National Oceanic and Atmospheric Administration, available at...

Variations and controlling factors of soil denitrification rate

Zhaolei Li, Ze Tang, Zhaopeng Song, Weinan Chen, Dashuan Tian, Shiming Tang, Xiaoyue Wang, Jinsong Wang, Wenjie Liu, Yi Wang, Jie Li, Lifen Jiang, Yiqi Luo & Shuli Niu
The denitrification process profoundly affects soil nitrogen (N) availability and generates its byproduct, nitrous oxide, as a potent greenhouse gas. There are large uncertainties in predicting global denitrification because its controlling factors remain elusive. In this study, we compiled 4301 observations of denitrification rates across a variety of terrestrial ecosystems from 214 papers published in the literature. The averaged denitrification rate was 3516.3 ± 91.1 µg N kg−1 soil day−1. The highest denitrification rate was...

Dietary metabarcoding datasets for the southern meadow jumping mouse (Zapus luteus luteus)

Daniel Sanchez, Austin Dikeman, Viacheslav Fofanov, Jacque Lyman, Jennifer Zahratka, Faith Walker & Carol Chambers
The southern meadow jumping mouse (Zapus luteus luteus) is Endangered in the US due to loss of riparian habitat and knowledge of diet can focus conservation efforts. Context and life stages of diet have been documented for other species of Zapus (seeds, insect larvae, and hypogeous fungi), possibly shifting toward greater diversity in seed predations prior to hibernation. Yet, challenges in field observation, thorough digestion, and lack of scalability have hindered a thorough survey of...

The force response of muscles to activation and length perturbations depends on length history

Kiisa Nishikawa & Siwoo Jeong
Recent studies have demonstrated that muscle force is not determined solely by activation under dynamic conditions, and that length history has an important role in determining dynamic muscle force. Yet, the mechanisms for how muscle force is produced under dynamic conditions remain unclear. To explore how muscle force production is determined under dynamic conditions, we investigated the effects of muscle stiffness, activation, and length perturbations on muscle force. First, submaximal isometric contraction was established for...

Sperm limitation produces male biased family sex ratios

Stephen Shuster, Zane Holditch, Kayla Ochoa, Shauna Greene, Shay Allred & Jeffrey Baranowski
Haplo-diploid sex determination in the parasitoid wasp, Nasonia vitripennis (Walker), allows females to adjust their brood sex ratios. Females influence whether ova are fertilized, producing diploid females, or remain unfertilized, producing haploid males. Females appear to adjust their brood sex ratios to minimize “local mate competition,” i.e., competition among sons for mates. Because mating occurs between siblings, females may optimize mating opportunities for their offspring by producing only enough sons to inseminate daughters when ovipositing...

Microbiomes associated with avian malaria survival differ between susceptible Hawaiian honeycreepers and sympatric malaria-resistant introduced birds

Amanda Navine, Kristina Paxton, Eben Paxton, Patrick Hart, Jeffrey Foster, Nancy McInerney, Robert Fleischer & Elin Videvall
Of the estimated 55 Hawaiian honeycreepers (subfamily Carduelinae) only 17 species remain, 9 of which the International Union for Conservation of Nature considers endangered. Among the most pressing threats to honeycreeper survival is avian malaria, caused by the introduced blood parasite Plasmodium relictum, which is increasing in distribution in Hawai`i as a result of climate change. Preventing further honeycreeper decline will require innovative conservation strategies that confront malaria from multiple angles. Research on mammals revealed...

A genomic perspective on the evolutionary diversification of turtles

Simone Gable, Michael Byars, Robert Literman & Marc Tollis
To examine phylogenetic heterogeneity in turtle evolution, we collected thousands of high-confidence single-copy orthologs from 19 genome assemblies representative of extant turtle diversity and estimated a phylogeny with multispecies coalescent and concatenated partitioned methods. We also collected next-generation sequences from 26 turtle species and assembled millions of biallelic markers to reconstruct phylogenies based on annotated regions from the western painted turtle (Chrysemys picta bellii) genome (coding regions, introns, untranslated regions, intergenic, and others). We then...

Selection and evolution at the community level using common garden data

Stephen Shuster, Arthur Keith & Thomas Whitham
A key issue in evolutionary biology is whether selection acting at levels higher than the individual can cause evolutionary change. If it can, then conceptual and empirical studies must consider how selection operates at multiple levels of biological organization. Here, we test the hypothesis that estimates of broad-sense community heritability, H2C, can be used to predict the evolutionary response by community-level phenotypes when community-level selection is imposed. Using an approach informed by classic quantitative genetics,...

Zapus hudsonius luteus microsatellite and mtDNA datasets

Daniel Sanchez, Faith Walker & Carol Chambers
In the face of accelerated warming and drying, habitat specialists of riparian zones could be threatened with genetic erosion if their effective population sizes become small due to loss and fragmentation of habitat. The New Mexico meadow jumping mouse (Zapus hudsonius luteus) is Endangered due to a suite of disturbances to their riparian habitat but the degree of functional connectivity within and among the drainages they occupy is unknown. Using microsatellite and mtDNA, we examined...

Functional composition of plant communities mediates biomass effects on ecosystem service recovery across an experimental dryland restoration network

Bradley Butterfield, Kathleen Balazs & Seth Munson
Land degradation can result in a loss of critical ecosystem services that we often seek to restore through re-establishment of desired plant communities. Trait-based approaches have the potential to target specific ecosystem services based on associations between the functional composition of plant communities and ecosystem properties that serve as indicators of those services. The effect of functional composition on ecosystem recovery may depend on the amount of restored plant biomass, itself a supporting service frequently...

Registration Year

  • 2022

Resource Types

  • Dataset


  • Northern Arizona University
  • United States Geological Survey
  • University of Rhode Island
  • Jeonju University
  • Southwest University
  • Chinese Academy for Environmental Planning
  • University of Hawaii at Hilo
  • Chinese Academy of Sciences
  • California State University, Sacramento
  • University of North Carolina at Greensboro