Spatial distribution of an assemblage of an endemic genus of birds: an example from Madagascar

Chiatante, Gianpasquale

doi:10.1111/aje.12917

Cited by 4 publications

(2 citation statements)

References 100 publications

(124 reference statements)

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“…19,59 To test the reliability of the index, the surveys were resampled 1000 times by the bootstrap method, 20 and the mean values and 95% confidence intervals were calculated. 19,60,61 Furthermore, to better understand how the abundances of each species are related to each other, their relationships were tested by Pearson’s correlation test. 20 The analyses were performed using the R v.3.3.2 54 statistical software.…”

Section: Methodsmentioning

confidence: 99%

Habitat use and niche overlap of ground-nesting steppic birds

Chiatante

2022

Avian Biology Research

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Steppic habitats host an extremely high proportion of birds with unfavourable conservation status in Europe, such as larks. This research aims to both investigate habitat-lark relationships and assess the niche overlap among larks in southern Italy during the breeding season. Studied in particular were the Eurasian Skylark ( Alauda arvensis), the Greater Short-toed Lark ( Calandrella brachydactyla), the Calandra Lark ( Melanocorypha calandra), the Crested Lark ( Galerida cristata) and the Woodlark ( Lullula arborea). During the 2012 breeding season, 301 point counts were carried out, and these were randomly placed in the study area according to a stratified sampling design. Resource selection probability functions were used to build two models for each species: (i) a binary logistic regression using the presence units as the dependent variable and (ii) a GLM with Poisson’s error distribution using the abundance of larks in each sampling point as the dependent variable. In the first model, the land cover in the cells of a 100-m-grid superimposed onto the study area was used as a covariate, whereas in the second model, the same covariate was measured, but in a 300-m-buffer around the sampling points. Finally, niche overlap was measured by Hurlbert’s Index with bootstrap resampling. Results showed that the Skylark, Short-toed Lark, Calandra Lark and Crested Lark are tightly associated with both non-irrigated crops and dry grasslands, with these species selecting areas in which both habitats are present in particular. Furthermore, there is a strong niche overlap at macrohabitat level among the species, with the exception of the Woodlark, which is an ecotonal species.

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Section: Methodsmentioning

confidence: 99%

Habitat use and niche overlap of ground-nesting steppic birds

Chiatante

2022

Avian Biology Research

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“…The dry deciduous forest in western Madagascar is home to several representatives of an endemic genus of cuckoos, the couas (Rajaonarivelo et al 2020), including the two study species, Coquerel's coua (Coua coquereli) and the largest living member of the genus, the giant coua (Coua gigas) (Safford et al 2020). They belong to the ground-dwelling couas and are mainly distributed in western Madagascar (Chiatante 2021). Previous studies have already addressed the increasing anthropogenic pressure on the microhabitat and behaviour of both birds (Chouteau 2004, 2007, 2009).…”

Section: Introductionmentioning

confidence: 99%

Exploring the potential of occupancy modelling using passive acoustics in <i>Coua gigas</i> and <i>Coua coquereli</i>

Jordan,

Markolf

2024

MCD

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In highly threatened habitats such as the dry deciduous forests of western Madagascar, it is essential to develop new approaches to detect population changes and evaluate conservation measures. Passive acoustic monitoring (PAM) is such a promising approach. This method has many advantages over conventional methods, such as time efficiency, money savings, and reduced wildlife disturbance. It is especially suitable for studying occupancy and activity patterns of vocalizing species such as birds. Our study analyzed data recorded with autonomous sound recorders in 2018 in Kirindy Forest for the territorial calls of Coua gigas and Coua coquereli. We modeled occupancy and detection probability for both species in the study area. We also examined activity patterns and found that the peak of vocal activity for Coua coquereli is at 700h and for Coua gigas at 1100h. To also test the value of PAM in relation to ecological factors we modeled occupancy and included logging status as a site covariate. We detected a positive influence of logging in occupancy of Coua gigas. Our study provides guidelines for future occupancy studies using PAM in the two coua species. We conclude that PAM will improve the ecological monitoring of soniferous animals in Madagascar.

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