Feeling the heat: Elevated temperature affects male display activity of a lekking grassland bird

Gudka, Mishal; Santos, Carlos David; Dolman, Paul M.; Abad‐Gómez, José M.; Silva, Joao

doi:10.1371/journal.pone.0221999

Cited by 27 publications

(18 citation statements)

References 61 publications

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“…The decline of the little bustard in Alentejo is probably not only a result of pressures occurring during the breeding season. In fact, multiple threats, such as loss of post-breeding and wintering areas, high anthropogenic mortality and global warming 40 , 67 , 68 , may be acting synergistically. Little bustards are short-distance migrants 69 , 70 that move towards more productive agriculture areas in northern, coastal or higher-altitude locations in Iberia during the dry summer season, in search of green vegetation 69 , 71 .…”

Section: Discussionmentioning

confidence: 99%

Changes in grassland management and linear infrastructures associated to the decline of an endangered bird population

Marques

Moreira

Alcazar

et al. 2020

Sci Rep

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European grassland birds are experiencing major population declines, mainly due to changes in farmland management. We analyzed the role of habitat availability, grazing management and linear infrastructures (roads and power lines) in explaining spatial and temporal variation in the population density of little bustards (Tetrax tetrax) in Portugal, during a decade in which the species population size halved. We used data from 51 areas (totaling ca. 1,50,000 ha) that were sampled in two different periods (2003–2006 and 2016). In 2003–2006, when the species occurred at high densities, habitat availability was the only factor affecting spatial variation in bustard density. In the 2016 survey, variation in density was explained by habitat availability and livestock management, with reduced bird numbers in areas with higher proportions of cattle. Population declines across the study period were steeper in areas that initially held higher densities of bustards and in areas with a higher proportion of cattle in the total stocking rate. Areas with higher densities of power lines also registered greater density declines, probably due to avoidance behavior and to increased mortality. Overall, our results show little bustards are currently lacking high quality grassland habitat, whose persistence depends on extensive grazing regimes and low linear infrastructure densities.

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Section: Discussionmentioning

confidence: 99%

Changes in grassland management and linear infrastructures associated to the decline of an endangered bird population

Marques

Moreira

Alcazar

et al. 2020

Sci Rep

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“…The timing of their movements may not be driven by food availability, but instead by foraging restrictions. For example, in arid climates, some birds reduce their activity during midday as a means of behavioral thermoregulation (Silva et al 2015, Gudka et al 2019). Likewise, visually orienting species are limited by the availability of light.…”

Section: Discussionmentioning

confidence: 99%

Diurnal timing of nonmigratory movement by birds: the importance of foraging spatial scales

Mallon

Tucker

Beard

et al. 2020

Journal of Avian Biology

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Timing of activity can reveal an organism's efforts to optimize foraging either by minimizing energy loss through passive movement or by maximizing energetic gain through foraging. Here, we assess whether signals of either of these strategies are detectable in the timing of activity of daily, local movements by birds. We compare the similarities of timing of movement activity among species using six temporal variables: start of activity relative to sunrise, end of activity relative to sunset, relative speed at midday, number of movement bouts, bout duration and proportion of active daytime hours. We test for the influence of flight mode and foraging habitat on the timing of movement activity across avian guilds. We used 64 570 days of GPS movement data collected between 2002 and 2019 for local (non-migratory) movements of 991 birds from 49 species, representing 14 orders. Dissimilarity among daily activity patterns was best explained by flight mode. Terrestrial soaring birds began activity later and stopped activity earlier than pelagic soaring or flapping birds. Broad-scale foraging habitat explained less of the clustering patterns because of divergent timing of active periods of pelagic surface and diving foragers. Among pelagic birds, surface foragers were active throughout all 24 hrs of the day while diving foragers matched their active hours more closely to daylight hours. Pelagic surface foragers also had the greatest daily foraging distances, which was consistent with their daytime activity patterns. This study demonstrates that flight mode and foraging habitat influence temporal patterns of daily movement activity of birds.

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“…The lower costs, energy consumption, and required storing capacity of accelerometers (Brown et al, 2013; Hughey et al, 2018; Korpela et al, 2020) result in lower weight and smaller‐sized devices with extended logging durations (several days or weeks; Brown et al, 2013). Nonetheless, further investigation of the use of accelerometers in the study of vocal communication has received limited attention (Naito et al, 2010; Oestreich et al, 2020; Saddler et al, 2017; Stimpert et al, 2020; Wijers et al, 2020) and has—to the best of our knowledge—only been applied in two species of bustards which perform booming calls, associated with excessive head movements (little bustards Tetrax , Gudka et al, 2019; African houbara bustards Chlamydotis undulata , Alonso et al, 2021). The limited adoption of accelerometers in vocal studies is possibly due to the difficulty of assigning accelerometer data to different behaviors in free‐roaming animals (Alonso et al, 2021; Brown et al, 2013; Nathan et al, 2012; Shamoun‐Baranes et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Quantifying song behavior in a free‐living, light‐weight, mobile bird using accelerometers

Eisenring

Eens

Pradervand

et al. 2022

Ecology and Evolution

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To acquire a fundamental understanding of animal communication, continuous observations in a natural setting and at an individual level are required. Whereas the use of animal‐borne acoustic recorders in vocal studies remains challenging, light‐weight accelerometers can potentially register individuals’ vocal output when this coincides with body vibrations. We collected one‐dimensional accelerometer data using light‐weight tags on a free‐living, crepuscular bird species, the European Nightjar (Caprimulgus europaeus). We developed a classification model to identify four behaviors (rest, sing, fly, and leap) from accelerometer data and, for the purpose of this study, validated the classification of song behavior. Male nightjars produce a distinctive “churring” song while they rest on a stationary song post. We expected churring to be associated with body vibrations (i.e., medium‐amplitude body acceleration), which we assumed would be easy to distinguish from resting (i.e., low‐amplitude body acceleration). We validated the classification of song behavior using simultaneous GPS tracking data (i.e., information on individuals’ movement and proximity to audio recorders) and vocal recordings from stationary audio recorders at known song posts of one tracked individual. Song activity was detected by the classification model with an accuracy of 92%. Beyond a threshold of 20 m from the audio recorders, only 8% of the classified song bouts were recorded. The duration of the detected song activity (i.e., acceleration data) was highly correlated with the duration of the simultaneously recorded song bouts (correlation coefficient = 0.87, N = 10, S = 21.7, p = .001). We show that accelerometer‐based identification of vocalizations could serve as a promising tool to study communication in free‐living, small‐sized birds and demonstrate possible limitations of audio recorders to investigate individual‐based variation in song behavior.

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Feeling the heat: Elevated temperature affects male display activity of a lekking grassland bird

Cited by 27 publications

References 61 publications

Changes in grassland management and linear infrastructures associated to the decline of an endangered bird population

Changes in grassland management and linear infrastructures associated to the decline of an endangered bird population

Diurnal timing of nonmigratory movement by birds: the importance of foraging spatial scales

Quantifying song behavior in a free‐living, light‐weight, mobile bird using accelerometers

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