13 Works

Leaf hair tufts function as Domatia for mites in Quercues agrifolia (Fagaceae)

Dena Grossenbacher
An identifying feature of Quercus agrifolia Ne ́e (Fagaceae) is the presence of hair tufts on lower leaf surfaces. In other plant species, hair tufts act as domatia for arthropods such as mites, which in turn feed on leaf fungi or small herbivores and possibly benefit plant health. However, this mutualistic relationship remains untested in Q. agrifolia. In this study two primary questions were addressed within a natural stand of Q. agrifolia in San Luis...

Natural and anthropogenic noise increase vigilance and decrease foraging behaviors in song sparrows

Kate Sweet, Benjamin Sweet, Dylan Gomes, Clinton Francis & Jesse Barber
Animals glean information about risk from their habitat. The acoustic environment is one such source of information, and is an important, yet understudied ecological axis. Although anthropogenic noise has become recently ubiquitous, risk mitigation behaviors have likely been shaped by natural noise over millennia. Listening animals have been shown to increase vigilance and decrease foraging in both natural and anthropogenic noise. However, direct comparisons could be informative to conservation and understanding evolutionary drivers of behavior...

Data and MATLAB files for: Timescale analyses of fluctuations in coexisting populations of a native and invasive tree squirrel

Robert Desharnais, Alan Muchlinski, Janel Ortiz, Ruby Alvidrez & Brian Gatza
1. Competition from invasive species is an increasing threat to biodiversity. In Southern California, the western gray squirrel (Sciurus griseus, WGS) is facing increasing competition from the fox squirrel (Sciurus niger, FS), an invasive congener. 2. We used spectral methods to analyze 140 consecutive monthly censuses of WGS and FS within a 11.3 ha section of the California Botanic Garden. Variation in the numbers for both species and their synchrony was distributed across long timescales...

Life history and environment predict variation in testosterone across vertebrates

Jerry Husak, Matthew Fuxjager, Michele A. Johnson, Maren Vitousek, Jeremy Donald, Clinton David Francis, Wolfgang Goymann, Michaela Hau, Bonnie Kircher, Rosemary Knapp, Lynn B. Martin, Eliot Miller, Laura Schoenle & Tony Williams
Endocrine systems act as key intermediaries between organisms and their environments. This interaction leads to high variability in hormone levels, but we know little about the ecological factors that influence this variation within and across major vertebrate groups. We study this topic by assessing how various social and environmental dynamics influence testosterone levels across the entire vertebrate tree of life. Our analyses show that breeding season length and mating system are the strongest predictors of...

Long-term noise pollution affects seedling recruitment, community composition, and negative effects persist after removal

Jennifer Phillips, Sarah Termondt & Clinton Francis
Noise pollution can affect species’ behaviors and distributions and may hold significant consequences for natural communities. While several studies have researched short-term effects of noise, no long-term research has examined whether observed patterns persist or if community recovery can occur. We utilized a long-term study system in New Mexico to examine the effects of continuous natural gas well noise exposure on seedling recruitment of foundational tree species (Pinus edulis, Juniperus osteosperma) and vegetation diversity. First,...

Thermal ecology and baseline energetic requirements of a large-bodied ectotherm suggest resilience to climate change

Hayley Crowell, Katherine King, James Whelan, Mallory Harmel, Gennesee Garcia, Sebastian Gonzales, Paul Maier, Heather Neldner, Thomas Nhu, John Nolan & Emily Taylor
Most studies on how rising temperatures will impact terrestrial ectotherms have focused on single populations or multiple sympatric species. Addressing the thermal and energetic implications of climatic variation on multiple allopatric populations of a species will help us better elucidate how a species may be impacted by altered climates. We used eight years of thermal and behavioral data collected from four populations of Pacific rattlesnakes (Crotalus oreganus) living in climatically distinct habitat types (inland and...

Circadian and circatidal rhythms of protein abundance in the California mussel (Mytilus californianus)

Cory Elowe & Lars Tomanek
Coastal habitats fluctuate with the 12.4 h tidal and 24 h light/dark cycle to predictably alter conditions such as air exposure, temperature, and food availability. Intertidal sessile bivalves exhibit behavioral and physiological adjustments to minimize the challenges of this environment. We investigated a high-resolution time course of the changes in protein abundance in the gill tissue of the intertidal mussel Mytilus californianus in a simulated tidal environment of 12:12 h light:dark cycles and a matching...

Mammalian intestinal allometry, phylogeny, trophic level and climate

María Duque-Correa, Daryl Codron, Carlo Meloro, Amanda McGrosky, Christiann Schiffmann, Mark Edwards & Marcus Clauss
An often-stated ecomorphological assumption that has the status of ‘textbook knowledge’ is that the dimensions of the digestive tract correlate with diet, where herbivores – consuming diets of lower digestibility – have longer intestinal tracts than faunivores – consuming diets of higher digestibility. However, statistical approaches have so far failed to demonstrate this link. Here, we collated data on the length of intestinal sections and body mass of 519 mammal species, and test for various...

Data from: A geographic cline in the ability to self-fertilize is unrelated to the pollination environment

Laura Galloway, Matt Koski, Jeremiah Busch & Dena Grossenbacher
The reproductive assurance (RA) hypothesis predicts that the ability to autonomously self-fertilize should be favored in environments where a lack of mates or pollinators limits outcross reproduction. Because such limits to outcrossing are predicted to be most severe at range edges, elevated autonomy in peripheral populations is often attributed to RA. We test this hypothesis in 24 populations spanning the range of Campanula americana, including sampling at the range interior and three geographic range edges....

Continuous forest inventory of Swanton Pacific Ranch

Eliza Badiozamani, Madison Gilmartin, Shelby Kranich, Alex Michelle, Savannah Rigney & Victoria Thek
C.F.I. plots are part of long term forest monitoring program on the lands of Cal Poly's Swanton Pacific Ranch that monitor forest conditions over time. Approximately two hundred, 1/5 acre fixed plots are spaced out in a systematic random sampling system over forested areas that results in a 2-3% sample size. Plot measurement began in 1997 and re-measurement occurs every 10 years. Information taken at each of these plots consists of: plot number, slope, aspect,...

Transgenerational plasticity and the capacity to adapt to low salinity in the eastern oyster, Crassostrea virginica

Joanna Griffiths, Kevin Johnson, Kyle Sirovy, Mark Yeats, Francis Pan, Jerome La Peyre & Morgan Kelly
Salinity conditions in oyster breeding grounds in the Gulf of Mexico are expected to drastically change due to increased precipitation from climate change and anthropogenic changes to local hydrology. We determined the capacity of the eastern oyster, Crassostrea virginica, to adapt via standing genetic variation or acclimate through transgenerational plasticity. We outplanted oysters to either a low or medium salinity site in Louisiana for two years. We then crossed adult parents using a North Carolina...

Methylation and gene expression data from: Differential DNA methylation across environments has no effect on gene expression in the eastern oyster

Kevin Marquez Johnson
1. It has been hypothesized that environmentally induced changes to gene body methylation could facilitate adaptive transgenerational responses to changing environments. 2. We compared patterns of global gene expression (Tag-seq) and gene body methylation (reduced representation bisulfite sequencing) in 80 eastern oysters (Crassostrea virginica) from six full-sib families, common gardened for 14 months at two sites in the northern Gulf of Mexico that differed in mean salinity. 3. At the time of sampling, oysters from...

Natural noise affects conspecific signal detection and territorial defense behaviors in songbirds

Veronica Reed, Cory Toth, Ryan Wardle, Dylan Gomes, Jesse Barber & Clinton Francis
Recent research suggests that anthropogenic noise can substantially alter animal behavior. Although there are many sources of natural background noise, the relative influence of these sounds on behavior has received much less attention. Using landscape-scale playbacks of rushing rivers and crashing ocean surf, we investigated how habitat appropriate natural noise alters territorial defense behaviors in lazuli buntings (Passerina amoena) occupying riparian areas and spotted towhees (Pipilo maculatus) in riparian and coastal areas when exposed to...

Registration Year

  • 2021

Resource Types

  • Dataset


  • California Polytechnic State University
  • Boise State University
  • Max Planck Institute for Ornithology
  • University of Massachusetts Amherst
  • Texas A&M University – San Antonio
  • University of the Free State
  • University of Michigan-Ann Arbor
  • Trinity University
  • University of Virginia
  • Simon Fraser University