Nest-site competition and killing by invasive parakeets cause the decline of a threatened bat population

Hernández‐Brito, Dailos; Carrete, Martina; Ibáñez, Carlos; Juste, Javier; Tella, José Luis

doi:10.1098/rsos.172477

Cited by 67 publications

(51 citation statements)

References 42 publications

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“…These relate mainly to competition with native cavity nesting species. For instance, the threatened greater noctule bat (Nyctalus lasiopterus) in Seville (Spain) can be forced out of roosting cavities by RNP, which has only recently been found to contribute to declining bat populations (Hernández-Brito et al 2018). Such long-term studies investigating the effect of competition on the local abundance of species are scarce in the invasion literature (Strayer et al 2006).…”

Section: Impacts Of Alien Parrots In Europe As a Function Of "Admissmentioning

confidence: 99%

Assessing the ecological and societal impacts of alien parrots in Europe using a transparent and inclusive evidence-mapping scheme

White¹,

Strubbe²,

Dallimer³

et al. 2019

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Globally, the number of invasive alien species (IAS) continues to increase and management and policy responses typically need to be adopted before conclusive empirical evidence on their environmental and socioeconomic impacts are available. Consequently, numerous protocols exist for assessing IAS impacts and differ considerably in which evidence they include. However, inclusive strategies for building a transparent evidence base underlying IAS impact assessments are lacking, potentially affecting our ability to reliably identify priority IAS. Using alien parrots in Europe as a case study, here we apply an evidence-mapping scheme to classify impact evidence and evaluate the consequences of accepting different subsets of available evidence on impact assessment outcomes. We collected environmental and socioeconomic impact data in multiple languages using a “wiki-review” process, comprising a systematic evidence search and an online editing and consultation phase. Evidence was classified by parrot species, impact category (e.g. infrastructure), geographical area (e.g. native range), source type (e.g. peer-review), study design (e.g. experimental) and impact direction (deleterious, beneficial and no impact). Our comprehensive database comprised 386 impact entries from 233 sources. Most evidence was anecdotal (50%). A total of 42% of entries reported damage to agriculture (mainly in native ranges), while within Europe most entries concerned interspecific competition (39%). We demonstrate that the types of evidence included in assessments can strongly influence impact severity scores. For example, including evidence from the native range or anecdotal evidence resulted in an overall switch from minimal-moderate to moderate-major overall impact scores. We advise using such an evidence-mapping approach to create an inclusive and updatable database as the foundation for more transparent IAS impact assessments. When openly shared, such evidence-mapping can help better inform IAS research, management and policy.

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Section: Impacts Of Alien Parrots In Europe As a Function Of "Admissmentioning

confidence: 99%

Assessing the ecological and societal impacts of alien parrots in Europe using a transparent and inclusive evidence-mapping scheme

White¹,

Strubbe²,

Dallimer³

et al. 2019

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“…Several studies already demonstrated that rose-ringed parakeet can have both ecological and socio-economic impacts, notably outcompeting local species, damage to agriculture and noise pollution near roost site, but their impacts are often restricted to certain populations and some ecoregions (Turbé et al 2017). Specifically in Seville, there is strong evidence that parakeets attack, displace and even kill an endangered bat species, the Giant noctule (Nyctalus lasiopterus), due to competition over tree cavities for roosting and reproduction (Hernández-Brito et al 2018). Similar concerns exist with respect to the vulnerable Lesser kestrel (Falco naumanni, Hernández-Brito et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Assessment of social perception of an invasive parakeet using a novel visual survey method

Luna¹,

Edelaar²,

Shwartz³

2019

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The perceptions of the general public regarding invasive alien species (IAS) are important in the prevention of future invasions and the success of management programmes. Here we use a novel visual method to investigate the perception of a charismatic IAS, the rose-ringed parakeet, across different stakeholders in Seville, Spain. Respondents were asked to select images of 10 bird species they would like to have present in their surroundings, out of 20 available images, including the parakeet and three other non-natives. This makes the survey easy, fast to take and attractive to potential participants, while prior and potentially biasing information of survey goals is minimised. Although more than 95% of the respondents recognised the parakeet, at least up to family level, only 34.8% selected it. Selection rates were even lower for three other IAS and even more so when the status of non-native species was indicated next to the images, suggesting that a social norm against IAS may be established. To validate our novel visual approach, we also assessed perception via a traditional questionnaire and the results of the two survey methods coincided. Finally parakeet selection differed importantly amongst pre-defined sectors of the public and people who had prior experience with the parakeet selected it less frequently (e.g. farmers, park managers). These results highlight the importance of studying different stakeholders to get the full picture when considering IAS management programmes. Our new visual survey method can thus serve as an excellent and user-friendly tool to study people’s perceptions regarding charismatic IAS and facilitate well-informed and sensible decision-making.

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“…With a population previously estimated at ca. 500 individuals, but now in dramatic decline due to an invasive parakeet species (Hernández-Brito et al, 2018) that is taking over the roosting holes, it was once the largest known breeding site of giant noctules (Popa-Lisseanu et al, 2008).…”

Section: Focal Species and Study Populationmentioning

confidence: 99%

Kin structure and roost fidelity in greater noctule bats

Santos

Meyer

Ibáñez

et al. 2019

Preprint

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Tel: +33623720645 Running Header: Kin structure of the giant noctule Santos et al. Understanding social behavior in mammals: Kin structure and roost fidelity in giant noctule bats ABSTRACTRoost fidelity is an important aspect of mammalian biology. Studying the mechanisms underlying philopatry can help us understand a species' energetic requirements, ecological constraints and social organisation. Temperate bat species notably exhibit a comparatively high degree of female philopatry, resulting in maternity colonies segregated at the mitochondrial level. While cooperative behaviours between colony members are well documented across temperate genera, evidence for a genetic basis to these traits is limited. We focus on the greater noctule, Nyctalus lasiopterus, to study this behaviour in more depth. We make use of microsatellite data for 11 markers across 84 individuals residing in Maria Luisa Park in Seville, Spain. At the time of sampling, this site boasted the highest number of registered bats of this species, among which three social groups were observed to segregate spatially. We studied the distribution of pairs of individuals across relation categories and relatedness estimates relative to the social group of each individual. This analysis was complemented by information on roost-use frequency among a subset of genotyped bats. We found no significant relationship between roost use and genetic distance, but there was evidence of higher group-sharing with increased levels of relatedness. Mother-daughter pairs shared the same group more often than expected, as did pairs of individuals of relatedness above 0.36. We discuss the implications of these results in terms of the behavioural ecology of temperate bats and for conservation efforts aimed at preserving them.

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Nest-site competition and killing by invasive parakeets cause the decline of a threatened bat population

Cited by 67 publications

References 42 publications

Assessing the ecological and societal impacts of alien parrots in Europe using a transparent and inclusive evidence-mapping scheme

Assessing the ecological and societal impacts of alien parrots in Europe using a transparent and inclusive evidence-mapping scheme

Assessment of social perception of an invasive parakeet using a novel visual survey method

Kin structure and roost fidelity in greater noctule bats

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