Seasonal Fluctuation of the Orange-Winged Amazon at a Roosting Site in Amazonia

Moura, Leiliany Negrão de; Vielliard, Jacques; Silva, Maria Luisa da

doi:10.1676/09-013.1

Cited by 6 publications

(4 citation statements)

References 13 publications

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“…Although dawn and dusk roost counts may be equivalent for some species (e.g. Downs 2005;de Moura et al 2010), evidence indicates that this should not be assumed a priori, and that the period most favourable for surveying varies among species, even within a genus (Amazona; Cougill and Marsden 2004;Berg and Angel 2006;Matuzak and Brightsmith 2007). Thus, prior to establishing protocols, researchers should evaluate the best period for surveys, considering flight patterns, the time it takes for birds to leave from or arrive at roosts, and the size of flocks.…”

Section: Roost Surveysmentioning

confidence: 99%

“…Roost monitoring should be done at a time of year when roosts are stable and birds are sedentary (Cougill and Marsden 2004), which seems to vary among species. For example, roosts of Amazona parrots (Gnam and Burchsted 1991;Cougill and Marsden 2004;Berg and Angel 2006;Matuzak and Brightsmith 2007;de Moura et al 2010) appear to be larger and more stable than those of Carnaby's Cockatoo (Calyptorhynchus latirostris; Burnham et al 2010) and Green-rumped Parrotlets (Forpus passerinus; Casagrande and Beissinger 1997). Determining the 'catchment area' (Cougill and Marsden 2004) of individuals using known roosts in a region with telemetry may be an alternative to finding every roost for estimating population size.…”

Section: Roost Surveysmentioning

confidence: 99%

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Revisiting methods for estimating parrot abundance and population size

Dénes

Tella

Beissinger

2017

Emu - Austral Ornithology

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Estimating abundance and population size is essential for many ecological and conservation studies of parrots. Achieving these goals requires methods that yield reliable estimates, but parrot traits can make them difficult to detect, count, and capture. We review established and emergent sampling and analytical methods used to estimate parrot abundance and population size, focusing on their assumptions, requirements, and limitations. Roost surveys are cost-effective if all roost locations in a region are known and stable, which is uncommon. Capture-recapture methods incorporate detection probability, but capturing, marking and resighting parrots can be difficult. Distance sampling estimates detection probability and surveys multiple species simultaneously, but is sensitive to the spatial distribution of individuals and excludes birds in flight. Roadside transects can cover large areas and survey multiple species, but habitats near roads may differ from the surrounding areas, biasing abundance estimates. Occupancy surveys and hierarchical models usually require spatially and temporally replicated datasets. Both allow estimation of detection probability; the former dispenses with count data, while the latter is a versatile set of methods that can incorporate multiple processes influencing detection and abundance. Finally, passive acoustic surveys can sample multiple species simultaneously, but identification of vocalisations can be difficult and time-consuming.

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Section: Roost Surveysmentioning

confidence: 99%

Section: Roost Surveysmentioning

confidence: 99%

Revisiting methods for estimating parrot abundance and population size

Dénes

Tella

Beissinger

2017

Emu - Austral Ornithology

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“…In birds, the pair and by extension the family unit is often the fundamental social-unit of most systems (i.e., reproductive partners and yearly juveniles, except for colonial or cooperative breeders). While this is true during the breeding season, birds often join larger flocks for foraging or roosting outside the breeding season, or when food resources are scarce (Develey and Peres 2000 ; South and Pruett-Jones 2000 ; Amano et al 2006 ; de Moura et al 2010 ; see also Silk et al 2014 ). It is essential to consider such intraspecific variations in social systems if we want to characterize adequately their degree of social complexity, in particular in birds (see also Ashton et al 2018 ).…”

Section: Introductionmentioning

confidence: 99%

What constitutes “social complexity” and “social intelligence” in birds? Lessons from ravens

Boucherie

Loretto

Massen

et al. 2019

Behav Ecol Sociobiol

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In the last decades, the assumption that complex social life is cognitively challenging, and thus can drive mental evolution, has received much support from empirical studies in nonhuman primates. While extending the scope to other mammals and birds, different views have been adopted on what constitutes social complexity and which specific cognitive skills are selected for. Notably, many avian species form “open” groups as non-breeders (i.e., seasonally and before sexual maturity) that have been largely ignored as potential sources of social complexity. Reviewing 30 years of research on ravens, we illustrate the socio-ecological conditions faced by these birds as non-breeders and discuss how these relate to their socio-cognitive skills. We argue that the non-breeding period is key to understand raven social life and, to a larger extent, avian social life in general. We furthermore emphasize how the combination of the large-scale perspective (defining social system components: e.g., social organization, mating system) and the individual-scale perspective on social systems allows to better capture the complete set of social challenges experienced by individuals throughout their life, ultimately resulting on a more comprehensive understanding of species’ social complexity.

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“…Historically, population data is collected via traditional field-based counts which are a reliable method to determine the number of individuals in an area and evaluate population fluctuations due to immigration, emigration, and mortality events [18]. Publications using roost counts have generally been successful in estimating the number of parrots in a particular area or region; however, roost counts also present many challenges due to required time and funding, detectability of animals, and unpredictable roost use in some species [19,20]. Other forms of field counts such as transects and point counts are less commonly used on wild parrots due to their highly mobile lifestyles, sparse distribution, and large home ranges, and their general wariness around humans, which makes them difficult to count [10] (but see Joyner's transect guide [21]).…”

Section: Introductionmentioning

confidence: 99%

Range-Wide Population Assessment of the Endangered Yellow-Naped Amazon (Amazona auropalliata)

2020

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Yellow-naped amazons, Amazona auropalliata, have experienced a dramatic population decline due to persistent habitat loss and poaching. In 2017, BirdLife International changed the species’ status from threatened to endangered and estimated that between 10,000 and 50,000 individuals remained in the wild. An accurate estimate of the number of remaining wild individuals is critical to implementing effective conservation plans. Wright et al. conducted roost count surveys in Costa Rica and Nicaragua during 2016 and published their data in 2019; however, no population data exists for the rest of the range. We conducted roost counts at 28 sites across Mexico, Guatemala, and the Bay Islands in Roatan during 2018 and 2019. We counted 679 birds and combined our data with the published Wright et al. (2019) data for a total of 2361 wild yellow-naped amazons observed across the species’ range. There were fewer roosts detected in the northern region of the range than in the southern region. We found that roosts were most likely to occur in built-up rural and pasture habitat, with 71% found within 100 m of human habitation. Our results illustrate the need for immediate conservation action to mitigate decline, such as enforced legal action against poaching, nest guarding, and increased community education efforts.

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Seasonal Fluctuation of the Orange-Winged Amazon at a Roosting Site in Amazonia

Cited by 6 publications

References 13 publications

Revisiting methods for estimating parrot abundance and population size

Revisiting methods for estimating parrot abundance and population size

What constitutes “social complexity” and “social intelligence” in birds? Lessons from ravens

Range-Wide Population Assessment of the Endangered Yellow-Naped Amazon (Amazona auropalliata)

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