DOI: 10.5061/dryad.sj3tx96hx
title: Data from: Fledging success peaks later than insect prey biomass in two aerial insectivores: evaluating potential phenological mismatch and fitness consequences

description: These are data on timing (phenology) of bird breeding stages and success
 for the Olive-sided Flycatcher and the Western Wood-Pewee (aerial
 insectivorous birds) breeding in Yukon, Canada. The dataset
 "insect" has the ordinal date, average length of insects, the
 biomass estimate, temperature (C) for the day the insect sample was taken
 (please note that traps were open for several days), the proportion of
 Diptera (order of Flies) and Hymenoptera (order of bees, wasps, and flying
 ants) in each sample, the breeding or nesting "score" for each
 bird species. The nesting score is based on breeding progression days - an
 unpaired male bird would receive a "1", paired a "2",
 incubation a "3", etc., and then these are summed across each
 day. The datasets entitled "RMarkOS" and "RMarkWE" are
 the data used in RMark analyses that examine the daily survival
 probability of each nest based on day or age, timing (offset from insect
 abundance), or environmental variables (such as distance to water).
description: # Data from: Fledging success peaks later than insect prey biomass in two
 aerial insectivores: evaluating potential phenological mismatch and
 fitness consequences Dataset DOI:
 [10.5061/dryad.sj3tx96hx](https://doi.org/10.5061/dryad.sj3tx96hx) ##
 Description of the data and file structure Data were collected in Yukon,
 Canada between mid-May and August in the breeding seasons of 2013 - 2017
 by observational methods examining nesting timing and success of breeding
 birds (using 30 minute observations on 10 - 20 breeding pairs per day)
 (the birds included were the Olive-sided Flycatcher (*Contopus cooperi*)
 and the Western Wood-Pewee (*Contopus sordidulus*) and capturing insects
 on the territories of these birds using hanging Malaise traps with 1.1 m
 panels that intercept flying insects. Transect data were collected to
 capture dragonfly data (Odonata) by walking 50 m transects (less than 150
 m from a bird nest site). Please note that missing values indicate that
 the aforementioned transect data for large insects were only conducted in
 the final three years of the study (2015 - 2017, transect, OffsetT). Large
 insects were not caught in traps, and thus protocol was adjusted. There
 are also 4 n/a values in the Proportion of Dead vegetation variable in the
 RMARK data RMarkOS and 1 value in the RMarkWE due to protocol error (it
 was forgotten for that day). Other variables are complete. Within the same
 file: RMarkWE, there are 18 n/a values in the DtoEdge column (Distance to
 Edge) because there was no (obvious) edge to measure from. This did not
 seem to be a highly relevant variable and thus did not affect conclusions.
 ### Files and variables #### File: insect.csv **Description:**  #####
 Variables * date:Classic date * year: as described 20XX * jdate: Julian
 Date (day is given a number where Jan 1 = 1) * avelength: length of insect
 measured by ruler and presented in mm, calculated mean * rogers: estimate
 of size based on the equations from Rogers et al. 1977 * weight: per
 insect * number: number of insects per day total, including all traps *
 biomass: total calculated biomass for that day (weight x number per day) *
 temp:C * PropDipt:proportion of the catch that day that was Diptera
 (flies) * PropLepid:proportion of the catch that day that was Lepidoptera
 (butterflies and moths) * PropHymen:proportion of the catch that day that
 was Hymenoptera (bees and relatives) * Number:just record number *
 osflscore:bird nesting score for the OSFL * wewpscore:bird nesting score
 for the WEWP * trapdays:number of days the trap was open *
 traploc:location of insect trap * transect:raw count of large insects
 counted on transects (please see note above regarding missing values) ####
 File: RMarkOS.csv **Description:**  ##### Variables * Territory:Bird
 identification * FirstFound:Date of found nest, where the first day of the
 season = 1 (May 1 = 1) * LastPresent:Last found alive * LastChecked:Last
 checked * Fate:success or not, where success is 0, unsuccessful is 1 *
 Freq: * Attempt:1st or 2nd * Offset:time difference between this nesting
 event and the insect peak. * offsetT:offset, in days, from the date of
 insect peak from Transects (please see note above regarding missing
 values) * Slope:% slope * DtoWater: Distance to water in meters *
 AgeFound: Found first day or not, usually first day or second. *
 AgeDay1:Usually this is the same as 1, but just in case the nest age was
 very unclear when the nest was found, this could be a 1 or 2, but usually
 a 1. * PropDead:Proportion of dead standing trees * Year: 20XX * Species:
 OSFL or WEWP * Tempmay:Average May temperature in C. * daysbelow1:Number
 of days in May where the temperature dropped below 1 degree C. *
 startdate:Date of nest start, in ordinal days (or Julian days, same thing)
 * Hot:Number of days in May where the temperature reached equal to or
 above 17.5 C. #### File: RMarkWE.csv **Description:**  ##### Variables *
 Territory:Bird Identification * FirstFound:Date nest found to be alive *
 LastPresent:Last date nest found to be alive * LastChecked:Checked Last
 time * Fate:success or not, where success is 0, unsuccessful is 1 *
 Freq:all are 1's * Attempt:1st or 2nd * Offset:days offset (timing
 difference) between the insect peak and the breeding peak (day 9 or 10 in
 age of chicks in the nest) * offsetT:days offset (timing difference)
 between the insect peak from the transect data to the nesting score peak.
 (please see note above regarding missing values) * DtoWater:Distance to
 water (m) * DtoEdge:Distance to edge (m) * AgeFound:found on day 1 or not?
 (usually yes) * AgeDay1:Always a 1, just ignore. * PropDead:proportion of
 standing dead trees. * Year: * Species: * daysbelow1:Number of days in May
 where the temperature dropped below 1 degree C. * startdate:Date of nest
 start, in ordinal days (or Julian days, same thing) * Hot:Number of days
 in May where the temperature reached equal to or above 17.5 C. #### File:
 individualoffsets.csv **Description:**  ##### Variables * Year: 20XX *
 Bird:territory identifier * Species:OSFL "O" or WEWP
 "W" * Bpeak:date of nesting peak in days * Ipeak:date of insect
 peak in days * offset:days different * Success:yes (1) or no (0) *
 Clutch:number of chicks that made it to the day that at least one fledged.
 * Toffset:days of difference (please see note above regarding missing
 values) ## Code/software Excel will open all data files, and Excel and R
 are needed for these analyses, such as RMark or MARK for daily nest
 survival. the Generalized Additive Mixed Models can be completed by
 various statistical packages and software, although I used RStudio.