Population responses of pest birds across a forest cover gradient in the Chaco ecosystem

Verga, Ernesto G.; Huais, Pablo Yair; Herrero, M.

doi:10.1016/j.foreco.2021.119174

Cited by 8 publications

(6 citation statements)

References 40 publications

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“…Seasonal changes in color variation in both sexes can also be observed in four passerine bird species such as the Robin (Erithacus rubecula), Blackbird (Turdus merula), Blue tit (Cyanistes caeruleus) and Great tit (Parus major) [10,13]. But unlike these passerine species, the Eared Dove is an opportunistic species that successfully exploits the ad lib availability of food and nesting sites offered by human activities [38][39][40][41]. Our sampling data and those of indicate an approximate sex ratio of 1:1 throughout the year.…”

Section: Chromatic Distancesmentioning

confidence: 99%

“…All these characteristics (opportunistic behavior, low nesting requirements and similar sex ratio) lead us to consider that perhaps the selection pressure vis-à-vis the opposite sex is relatively unimportant in this species. The seasonal change in crown coloration could be a remnant feature of a time when the species did not constitute a plague (before the 50's) and when its reproduction and feeding depended exclusively on the resources provided by natural environments (forest) without human intervention [40,41], unlike nowadays when it inhabits urban and peri-urban areas with large extensions of crop production [40,41]. Future experiments will be necessary to elucidate the functionality of the seasonal change in crown coloration in this dove.…”

Section: Chromatic Distancesmentioning

confidence: 99%

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Annual molt period and seasonal color variation in the Eared Dove´s crown

Valdez

Benitez‐Vieyra²

2023

PLoS ONE

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Molting is an important process in which old and worn feathers are exchanged for new ones. Plumage color is determined by pigments such as carotenes, melanin and by the ultrastructure of the feather. The importance of plumage coloration has been widely studied in different groups of birds, generally at a particular time of the year. However, plumage coloration is not static and few studies have addressed the change in plumage color over time and its relationship to reproductive tasks. The Eared Dove (Zenaida auriculata, Des Murs, 1847) has a melanistic coloration with sexual dichromatism in different body regions. The Eared Dove´s crown is the most exposed body region during the bowing display. Our objective was therefore to accurately determine the molting period of the crown feathers and study the seasonal variation in their coloration in females and males. Our findings indicate a molting period of 6 months (January to June). The new feathers are undergoing changes in their coloration from July to December. During that period we apply an avian vision model then enabled us to reveal a seasonal variation in the coloration of the crown feathers in both sexes, as given by a change in the chromatic distances. The highest values in the chromatic distances towards the reproductive period are given by a change in the UV-violet component of the spectrum, indicating changes in the microstructure of the feather. This change in crown coloration towards the breeding season could be linked to reproductive behaviors.

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Section: Chromatic Distancesmentioning

confidence: 99%

Section: Chromatic Distancesmentioning

confidence: 99%

Annual molt period and seasonal color variation in the Eared Dove´s crown

Valdez

Benitez‐Vieyra²

2023

PLoS ONE

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“…Connection to infrastructure was expressed by the distance to the nearest paved road (OpenStreetMap, 2022). Corine land cover data (European Environment Agency, 2018) was used to calculate the proportion of open land surrounding a parcel within a radius of 2 km (Verga et al, 2021); this value was pre-selected from a series of logarithmically scaled possible radii of 50 to 5000 m, based on correlations of the predictor with the answer variables (Jackson and Fahrig, 2015). The percentage of each forest parcel border that coincides with open land was calculated from Corine data.…”

Section: Topographical Parametersmentioning

confidence: 99%

Owner attitudes and landscape parameters drive stand structure and valuable habitats in small-scale private forests of Lower Saxony (Germany)

Hansen

Tiebel

Plieninger

et al. 2023

Preprint

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Small-scale private forests cover large areas in Europe and often contain structures and habitats of high nature conservation value that are increasingly put under pressure due to a rising interest in fuelwood and wood products. We investigate the distribution of variables like living wood and deadwood volumes, management intensity, diversity and density of tree-related microhabitats recorded in 81 small-scale private forest parcels in the Lower Saxon Hills (northwest Germany). We provide an assessment of the influence of predictors like the individual forest owners’ goals and activities, as stated by them in a quantitative survey, as well as topographical parameters like parcel size, slope, landscape fragmentation and forest continuity. Our results indicate that there are two types of valuable structures in small-scale private forests: (a) slowly evolving structures like large-diameter living wood and tree-related microhabitats which mostly depend on topographical parameters that act on longer time scales, and (b) fast evolving structures like deadwood that are influenced by both owner attitudes and topographical parameters. The resulting implications for integrative forest and conservation management are discussed.

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“…As explained by Ibañez-A ́lamo et al ( 2017), species living close to humans, such as feral pigeons (e.g., Perez-Sancho et al, 2020), may receive more attention because of economic and public health issues (Lindahl and Magnusson, 2020) and/or because they are easier to study. Similarly, some applied research has been conducted on columbid species living close to humans in relation to negative impacts on crops (e.g, Murton and Jones, 1973;van Niekerk and van Ginkel, 2009;Firake et al, 2016;Verga et al, 2021). However, columbid species causing damages on crops may also experience higher extinction risk due retaliatory actions, including hunting and poisoning, by farmers (Marrero et al, 2004;Cuesta Hermira and Michalski, 2022).…”

Section: Scientific Attentionmentioning

confidence: 99%

Identifying global research and conservation priorities for Columbidae: a quantitative approach using random forest models

Cambrone¹,

Jean-Pierre²,

Bezault³

et al. 2023

Front. Ecol. Evol.

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The family of Columbidae, including pigeons and doves, remains understudied despite their patrimonial value and high ecological and conservation relevance. Currently, 353 extant columbid species are listed in the IUCN red list, with about 20% of them being threatened with extinction. However, there has been little effort so far to synthetize the available information on factors influencing extinction risk and the allocation of research effort among columbid species. In this context, using random forest models, the present study aims at quantitatively assessing to what extent environmental, life history and socio-political factors may drive the extinction risk of pigeons and doves and explain differences in scientific attention among species. We found that high risk of extinction in columbids is associated with small historical range, exposure to invasive alien mammals and living in isolated islands and/or at low altitudes, while the probability of population decline is associated with species body size, surrounding human density and narrow habitat breadth. We also evidenced a large disparity between species or population extinction risk and scientific interest. Indeed, most of the studies on columbids have been conducted by scientists from North America and Western Europe on their local species, whereas species from biodiversity hotspots, which are more at risk of extinction, have comparatively received little attention. This unequal acquisition of knowledge creates gaps that deserve to be filled in order to have a good appreciation of extinction risk in columbids and associated threats, through fair transnational cooperation, academic training and regional coordination in conservation-oriented research on columbids.

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Population responses of pest birds across a forest cover gradient in the Chaco ecosystem

Cited by 8 publications

References 40 publications

Annual molt period and seasonal color variation in the Eared Dove´s crown

Annual molt period and seasonal color variation in the Eared Dove´s crown

Owner attitudes and landscape parameters drive stand structure and valuable habitats in small-scale private forests of Lower Saxony (Germany)

Identifying global research and conservation priorities for Columbidae: a quantitative approach using random forest models

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