DOI: 10.5061/dryad.2jm63xszn
title: Polyethylene tarping elevates temperature and reduces emergence of <em>Phloeosinus punctatus</em> LeConte (Coleoptera: Curculionidae) from giant sequoia debris piles

description: This study evaluated tarping treatments for managing P. punctatus
 populations in recently fallen branches in giant sequoia forests. A field
 experiment tested beetle emergence from debris piles relative to tarping
 treatments (covered or uncovered by a 4 mm clear polyethylene tarp) using
 a paired design, and the effects of several environmental factors on
 emergence were modeled. Tarping treatment resulted in a 53% reduction in
 mean beetle emergence; standardized beetle emergence was 9.8 ± 2.6
 beetles/kg in the treatment group, 19.2 ± 5.6 beetles/kg in the control
 group, and an average of 14.5 for the study. Mean temperatures were 21.8°C
 in tarped piles, compared to 19.7°C in control piles, indicating that
 tarping altered the thermal environment to impact emergence. No emergence
 occurred when the mean ambient temperature exceeded 24°C.
description: # Polyethylene tarping elevates temperature and reduces emergence of
 *Phloeosinus punctatus* LeConte (Coleoptera: Curculionidae) from giant
 sequoia debris piles Dataset DOI:
 [10.5061/dryad.2jm63xszn](https://doi.org/10.5061/dryad.2jm63xszn) ##
 Description of the data and file structure These data were collected from
 an experiment that measured bark beetle emergence from wood debris piles
 (giant sequoia in California) that were either covered with a clear
 polyethylene tarp or left undisturbed (controls). The experiment used a
 paired design. Temperature loggers were placed in each pile to measure
 ambient mean and maximum temperatures. Other attributes were also measured
 for each pile, including canopy structure and distance to the nearest host
 tree.  ### Files and variables #### File: data_summary_glm.1.csv
 **Description:** A summary of all primary project data used in the
 construction of linear models.  ##### Variables * site: The site number. 
 * Treatment: The treatment (tarped or control). * rep: Replicate number in
 paired test.  * pilemass: Mass of debris pile, kg.  *
 totalbeetleemergence: Total number of emerged beetles per pile. *
 canopyopenness: Canopy openness, as a fraction (0-1). * tmax: Maximum
 ambient temperature, degrees C. * tmean: Mean ambient temperature, degrees
 C. * elevation: Elevation above sea level of pile location, m. * beetlekg:
 Beetle emergence standardized to mass of branch piles, beetles/kg. *
 metersfrom: Distance of pile to nearest host tree (giant sequoia), m.  For
 cells with a value of 'n/a', data loggers had malfunctioned, and
 readings were not retained. #### File: data_summary_tarping.csv
 **Description:**  ##### Variables * site: The site number.  * rep:
 Replicate number in paired test.  * control: Standardized beetle emergence
 (beetles/kg), control piles.  * tarped: Standardized beetle emergence
 (beetles/kg), tarped piles.  * t_diff: The difference in standardized
 beetle emergence between two piles in a paired replicate (control -
 tarped).  ## Code/software Files can be viewed in any software that
 supports .csv. Data were statistically analyzed in the R programming
 environment.  ## Access information Other publicly accessible locations of
 the data: * NA Data was derived from the following sources: * NA