Status of the rose-ringed parakeet Psittacula krameri in Lisbon, Portugal

Luna, Álvaro Fernández; Monteiro, Miguel; Asensio-Cenzano, Elsa; Reino, Luís

doi:10.1515/biolog-2016-0083

Cited by 12 publications

(12 citation statements)

References 10 publications

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“…These results show a significant increase in the range and the size of the population (about 600 individuals recorded by Gereschi, 2018) compared to what was observed in the period 1996-2000 (Borgo et al, 2005). A similar increase was recorded for example also in Lisbon (Portugal) (Luna et al, 2016). Genoese citizens have observed parakeets and parrots feeding on the fruits and seeds of certain plant species, four of which hitherto unknown as food sources in Genoa (Spanò & Truffi, 1986;Maranini & Galluppo, 1994;Vergano, 1998;Gereschi, 2018): Citrus lemon (Lemon tree), Malus domestica (Apple tree), Olea europaea (Olive tree) and Thuja occidentalis (Thuja) (Table 2).…”

Section: Study Areasupporting

confidence: 85%

Parrots and parakeets in Genoa (Northwest Italy): preliminary report of a census and population dynamic analysis through citizen involvement

Ferretti¹,

Doria²,

Borgo³

et al. 2022

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In the city of Genoa (NW Italy) three breeding species of Psittaciformes are known to occur: Psittacula krameri, Amazona ochrocephala and Amazona aestiva. We planned to update the knowledge of these alien species involving citizens in a project coordinated and managed by professional scientists and technicians from the University of Genoa, the Natural History Museum "G. Doria", the Municipality of Genoa and the Ligurian Environmental Protection Agency (ARPAL). The aims of the research are to highlight and quantify the impact on the urban environment of parrots and parakeets and evaluate which aspects of their presence are most perceived (negatively or positively) by citizens. The data obtained so far, on the basis of 227 observations, have allowed us to outline some aspects of the biology and habits of local Psittaciformes. We have related these characteristics to the impact that these species have on citizens, in terms of hygienic problems and levels of appreciation. The results, if confirmed by further data, will help us to develop targeted management measures but also to improve communication strategies for the future involvement of citizens in data collection.

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Section: Study Areasupporting

confidence: 85%

Parrots and parakeets in Genoa (Northwest Italy): preliminary report of a census and population dynamic analysis through citizen involvement

Ferretti¹,

Doria²,

Borgo³

et al. 2022

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“…In our study, the RNP was an important prey for the long-eared owl, contributing over 10 % of the total volume in the diet. This parrot species shares colonial roosts (Clergeau and Vergnes, 2011;Luna et al, 2016) and is relatively large (125-135 gr; Tabethe et al, 2013), thus possibly providing owls with a large amount of food (Birrer, 2009). Only one roost of RNPs occurred in our study area (Pârâu et al, 2016), and it was located a few hundred meters from that of the long-eared owl.…”

Section: Discussionmentioning

confidence: 76%

“…The RNP is a hole-nesting species that prefers tree cavities. It is gregarious with shared nocturnal roosts consisting of up to thousands of individuals (Luna et al, 2016;Pârâu et al, 2016;Le Louarn et al, 2017). Being very widespread as a pet animal and due to its bright colour (Menchetti and Mori, 2014), RNPs are widely appreciated by the general public (Clergeau and Vergnes, 2011;Le Louarn et al, 2016;Berthier et al, 2017), which may lead to precaution when planning management action (Crowley et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

'Some like it alien': predation on invasive ring–necked parakeets by the long–eared owl in an urban area

Mori

Malfatti²,

Louarn

et al. 2020

Anim. Biodiv. Conserv.

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Predation pressure by native species may limit the spread of alien invasive species, thus playing a pivotal role in the impact and implementation of management strategies. The ring–necked parakeet Psittacula krameri is one of the most widespread alien bird species in Europe, with nearly 70 established populations. Predators of this species include diurnal raptors, synanthropic corvids, and rodents. Here we report for the first time that long–eared owls Asio otus might have preyed upon parakeets in their night roosts. Analysis of 167 owl pellets showed that ring–necked parakeets made up over 10 % of the total volume of the diet of these owls in winter (32.93 % of absolute frequency), representing the most important prey species after murid rodents and passerine birds. Further studies are needed to investigate whether parakeet consumption by long–eared owls is only a local occurrence or whether it is widespread in European cities. If so, predation by long–eared owl may eventually lead to a form of parakeet control and may limit the impact of this introduced parakeet on native biodiversity.

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“…Given the relatively small population size, incoming parakeets were counted individually. We discarded movements between roosting trees and subtracted any individuals who left the roost, mostly to return a bit later (Luna et al ., ). A census of parakeet breeding was carried out through direct observations of parakeets present in the study area.…”

Section: Methodsmentioning

confidence: 97%

‘The early bird catches the nest’: possible competition between scops owls and ring‐necked parakeets

Mori

Ancillotto

Menchetti

et al. 2017

Animal Conservation

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Competition for critical resources is one of the key mechanisms through which invasive species impact on native communities. Among birds, the widely introduced ring-necked parakeet Psittacula krameri locally affects cavity-nesting communities through competition for suitable tree cavities, although it remains unclear to what extent such competition translates into population declines of native species. Here, we studied the potential for nest site competition between ring-necked parakeets and the native scops owl Otus scops, a small nocturnal migratory raptor, by comparing the spatial distribution of the nest site locations of the raptor before (2002) and after (2015) the parakeet invasion. Pre-invasion nesting sites of scops owls (2002) strongly coincided with those selected by ring-necked parakeets, but although both parakeet and scops owl populations increased during the study period, this was no longer true for 2015. Ring-necked parakeets took over several cavities formerly occupied by scops owls, and land-use data suggest that because of the higher overall breeding densities in 2015, scops owls were forced to occupy suboptimal breeding habitats to minimize nest site competition with invasive parakeets. Ring-necked parakeets start breeding early in the season, a behaviour enabling them to secure the best nest sites first, before the owls return from their wintering grounds. Our study highlights that locally observed competition not necessarily impacts on population dynamics of competing species and thus warns against uncritical extrapolation of smaller scale studies for assessing invasive species risks at larger spatial scales. Nonetheless, given the increasing number of studies demonstrating its competitive capacities, monitoring of ring-necked parakeet populations is prudent and mitigation measures (such as mounting of man-made nest-boxes, which are used by scops owls, but not by parakeets) may be justified when the parakeets are likely to invade areas harbouring cavity-nesters of conservation concern.

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Status of the rose-ringed parakeet Psittacula krameri in Lisbon, Portugal

Abstract: Of all alien parrots, the rose-ringed parakeet

Cited by 12 publications

References 10 publications

Parrots and parakeets in Genoa (Northwest Italy): preliminary report of a census and population dynamic analysis through citizen involvement

Parrots and parakeets in Genoa (Northwest Italy): preliminary report of a census and population dynamic analysis through citizen involvement

'Some like it alien': predation on invasive ring–necked parakeets by the long–eared owl in an urban area

‘The early bird catches the nest’: possible competition between scops owls and ring‐necked parakeets

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