6 Works

Data from: Evolutionary pressures on primate intertemporal choice

Jeffrey R. Stevens & J. R. Stevens
From finding food to choosing mates, animals must make intertemporal choices that involve fitness benefits available at different times. Species vary dramatically in their willingness to wait for delayed rewards. Why does this variation across species exist? An adaptive approach to intertemporal choice suggests that time preferences should reflect the temporal problems faced in a species's environment. Here, I use phylogenetic regression to test whether allometric factors relating to body size, relative brain size and...

Data from: Competition for hummingbird pollination shapes flower color variation in Andean Solanaceae

Nathan Muchhala, Sönke Johnsen & Stacey Dewitt Smith
One classic explanation for the remarkable diversity of flower colors across angiosperms involves evolutionary shifts among different types of pollinators with different color preferences. However, the pollinator shift model fails to account for the many examples of color variation within clades that share the same pollination system. An alternate explanation is the competition model, which suggests that color divergence evolves in response to interspecific competition for pollinators, as a means to decrease interspecific pollinator movements....

Data from: Population size-structure dependent fitness and ecosystem consequences in Trinidadian guppies

Ronald D. Bassar, Heatherly II, Thomas, Michael C. Marshall, Steven A. Thomas, Alexander S. Flecker, David N. Reznick & Thomas Heatherly
1. Decades of theory and recent empirical results have shown that evolutionary, population, community and ecosystem properties are the result of feedbacks between ecological and evolutionary processes. The vast majority of theory and empirical research on these eco-evolutionary feedbacks has focused on interactions among population size and mean traits of populations. 2. However, numbers and mean traits represent only a fraction of the possible feedback dimensions. Populations of many organisms consist of different size classes...

Data from: We'll meet again: revealing distributional and temporal patterns of social contact

Thorsten Pachur, Lael J. Schooler & Jeffrey R. Stevens
What are the dynamics and regularities underlying social contact, and how can contact with the people in one's social network be predicted? In order to characterize distributional and temporal patterns underlying contact probability, we asked 40 participants to keep a diary of their social contacts for 100 consecutive days. Using a memory framework previously used to study environmental regularities, we predicted that the probability of future contact would follow in systematic ways from the frequency,...

Data from: Across-year social stability shapes network structure in wintering migrant sparrows

Daizaburo Shizuka, Alexis S. Chaine, Jennifer Anderson, Oscar Johnson, Inger Marie Laursen & Bruce E. Lyon
Migratory birds often form flocks on their wintering grounds, but important details of social structure such as the patterns of association between individuals are virtually unknown. We analysed networks of co-membership in short-term flocks for wintering golden-crowned sparrows (Zonotrichia atricapilla) across three years and discovered social complexity unsuspected for migratory songbirds. The population was consistently clustered into distinct social communities within a relatively small area (~ 7 ha). Birds returned to the same community across...

Data from: The body size dependence of mutual interference

John P. DeLong & J. P. DeLong
The parameters that drive population dynamics typically show a relationship with body size. By contrast, there is no theoretical or empirical support for a body-size dependence of mutual interference, which links foraging rates to consumer density. Here, I develop a model to predict that interference may be positively or negatively related to body size depending on how resource body size scales with consumer body size. Over a wide range of body sizes, however, the model...

Registration Year

  • 2014
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Resource Types

  • Dataset
    6

Affiliations

  • University of Nebraska–Lincoln
    6
  • University of California System
    2
  • Duke University
    1
  • University of Georgia
    1
  • French National Centre for Scientific Research
    1
  • Max Planck Institute for Human Development
    1
  • University of Colorado Boulder
    1
  • University of Missouri
    1
  • Cornell University
    1