DOI: 10.5061/dryad.gtht76hkk
title: Raw data used for analysis of parental care from video footage of breeding Cape Rockjumpers (Chaetops frenatus), from the Western Cape of South Africa

description: Demonstrated negative effects of increased temperatures on avian
 reproductive success suggest a mechanism by which climate change may
 impact species persistence. High temperatures can result in reduced
 parental care and reduced nestling condition in passerines with dependent
 young, resulting in lowered fledging success and population recruitment.
 We examined provisioning rate and nestling condition in a South African
 mountain endemic, the Cape Rockjumper Chaetops frenatus, whose population
 declines correlate with warming habitat. Our aim was to determine whether
 Rockjumper reproductive success could be affected by high air
 temperatures. We set up video cameras on nests at three nestling age
 classes (≤ 7 days old; 8–12 days old; ≥ 13 days old) for 8 hours on 37
 separate days. We successfully collected full-day footage on 25 of the 37
 days (4 days with predation, 8 with equipment failure). Nestlings were
 weighed at the beginning and end of each film day, barring the 4 days with
 mid-day predation (N = 65 nestling measures from 33 of the 37 days).
 Average mass gain across all nestlings per nest was positively correlated
 with provisioning rate (0.78 g provisions-1 hr-1, CI: 0.26 – 1.30), and
 provisioning rate decreased at increasing temperatures (-0.08 provisions
 hr-1 °C-1, CI: -0.15 – -0.01). Daily change in mass of individual
 nestlings was negatively correlated with air temperatures above a
 significant temperature threshold (22.4 °C; -0.30 g °C-1, CI: -0.40 –
 -0.19).  This suggests nestling energy requirements were not
 being met on higher temperature days –– perhaps because nestling energy
 and water demands for thermoregulation are elevated and provisioning rate
 is not correspondingly maintained or increased. These results suggest that
 higher temperatures negatively affect nestling mass gain. While in our
 study this did not directly affect fledging rates, it may affect
 post-fledging survival.  
description: Table S1  Raw data for body mass (M<sub>b</sub>; g)
 collected before and after film setup (~8:45 – 17:15 SAST) of nestling
 rockjumpers at 14 nests on 33 days (N=65 nestling measures). Data
 collected for each day includes: territory designation, date, month, year,
 maximum daily temperature (“tmax”), nestling age class (≤ 7 days old; 8–12
 days old; ≥ 13 days old), brood size (“nestlings”), group size (“adults”),
 nestling change in M<sub>b</sub>, nestling starting
 M<sub>b</sub>, total length of time between measuring (min),
 percent daily change in mass per nestling (“Eqn2”; 100
 ((M<sub>b2</sub> -
 M<sub>b1</sub>)/M<sub>b1</sub>) / ((t<sub>2
 </sub>- t<sub>1</sub>)/480)), and daily change in mass
 per nestling (“Eqn1”; M<sub>b2</sub> -
 M<sub>b1</sub>) / ((t<sub>2 </sub>-
 t<sub>1</sub>)/480):
 <i>t<sub>2</sub>-t<sub>1</sub></i> is
 the number of minutes between morning (t<sub>1</sub> @ 9:00)
 and evening (t<sub>2</sub> @ 17:00),
 <i>M<sub>b1</sub> </i>is initial morning
 M<sub>b</sub>, and
 <i>M<sub>b2</sub></i> is evening
 M<sub>b</sub>. Table S2 Raw data for video
 footage collected from 25 days of filming 13 nests of rockjumpers between
 ~9:00 – 17:00 SAST. Data collected for each day includes: territory
 designation, total length of video (min), date, month, year, maximum daily
 temperature (“tmax”), nestling age class (≤ 7 days old; 8–12 days old; ≥
 13 days old), brood size (“nestlings”), group size (“adults”), proportion
 of visits with adult panting (panting per hour; “dissipation”), rate of
 adult provisioning (visits per hour; “provisioning”), time adults spent in
 the nest (“nest_min”), and average mass of nestlings from start to end of
 film time (“avg mb”). Table S3 Raw data for male
 proportion of nest behaviours collected from 32 days of at 13 nests
 rockjumpers between ~9:00 – 12:00 SAST. Data collected for each day
 includes: male proportion of provisioning visits (“m.f.provisioning”),
 male proportion of time spent brooding (“m.f.time”), territory
 designation, date, month, year, group size (“adults”), and age class (≤ 7
 days old; 8–12 days old; ≥ 13 days old).