Gypaetus Research Articles

Teleconnection between the Reproductive Parameters of the Bearded Vulture and Macroclimatic Oscillations: Implications for Conservation

ABSTRACT The Bearded Vulture (Gypaetus barbatus) is a scavenging bird of prey that was once widespread on the Iberian Peninsula. Its current distribution in Spain is limited to specific mountain ranges, including the Aragonese Pyrenees. The decline of the Iberian population has been linked to factors acting at a microscale level, such as the use of poisons, illegal hunting, and a decrease in extensive livestock farming. There are, however, other factors acting on a biogeographical scale that are not currently being considered and may also be affecting the viability of populations. The aim of this case study was to investigate the influences of large-scale environmental conditions on temporal variation in the reproductive parameters of the Bearded Vulture breeding population in the Aragonese Pyrenees. We tested the degree to which each of 26 macroclimatic oscillation indices with an effect on regional weather conditions were teleconnected with three reproductive parameters (hatching rate, fledging rate, and productivity). Two indices—the Tropical Northern Atlantic and East Atlantic/West Russia Pattern—were temporally correlated with Bearded Vulture reproductive parameters. The study results provide novel information to facilitate Bearded Vulture conservation because no previous studies have addressed this issue from a biogeographical and macroecological perspective. The results could have important implications for the management and conservation of the species and its successful reintroduction in other territories.

A record of a Bearded Vulture <i>Gypaetus barbatus</i> nest site at particularly high altitude in the Himalayas of Nepal

A record of a Bearded Vulture <i>Gypaetus barbatus</i> nest site at particularly high altitude in the Himalayas of Nepal

Heterospecific visual cues and trophic facilitation processes used by a solitary bone‐eating vulture

AbstractWhile the influence of public information sharing on foraging strategies is of growing interest, empirical studies exploring intraguild social information use and facilitation roles between individuals with different trophic specializations remain scarce. Heterospecific facilitation should be more common in specialist foragers, for example, the bearded vulture Gypaetus barbatus, a solitary bone‐eating scavenger. We monitored 133 carcasses of different types/sizes in open and shrubland landscapes in the Spanish Pyrenees to explore bearded vulture foraging in relation to social information transfer and adaptive trophic behavior. We hypothesized that they might (1) feed on carcasses after initial heterospecific exploitation; (2) use heterospecifics to locate and/or exploit carcasses; and (3) prefer old carcasses over fresh ones. We recorded bearded vultures scavenging at 44 carcasses; 95.5% had been previously exploited by heterospecifics (93.2% by griffon vultures Gyps fulvus and 2.3% by golden eagles Aquila chrysaetos) while only two small‐sized carcasses were scavenged without previous heterospecific exploitation. Bearded vultures were not observed scavenging at carcasses used only by mammals. Both griffon and bearded vultures took longer to find carcasses in shrublands than in open landscapes. However, bearded vulture arrival times between landscapes after carcass discovery by griffon vultures were similar. Bearded vultures were more likely to discover a carcass the greater the number of griffon vultures exploiting it. Only 10.4% bearded vulture scavenging events occurred after the third week following heterospecific exploitation, suggesting that recently opened carcasses were preferred. Clearly, heterospecifics play an essential role in bearded vultures foraging success, and griffon vultures are fundamental facilitators for specialist foragers, both in providing visual cues to food location and in opening up carcasses to enable access to food.

Demographic assessment of reintroduced bearded vultures in the Alps: Success in the core, challenges in the periphery

Abstract Regular assessment of reintroduced populations is essential to guide management and provide lessons for other reintroduction projects. Bearded vulture Gypaetus barbatus reintroduction in the Alps began in 1986 with the release of the first fledglings, the first successful reproduction was recorded in 1997, and the population has grown steadily since. A previous assessment suggested that no further releases would be required to establish a self‐sustaining population from a demographic point of view. However, this conclusion was based on a small sample size and spatially homogeneous demographic rates of released individuals, which may differ from and be spatially variable among wild‐hatched individuals. Using longitudinal data and breeding site survey data, we constructed an integrated population model to examine the demography of the entire Alpine population, spatially stratified into a core and a periphery. We performed retrospective population analyses to identify demographic reasons for spatial differences in population growth and conducted population viability analyses to assess the impact of future threats and reintroduction options. In 2021, an estimated 172 (CRI: 147–198) females were present in the Alps, of which 65 (CRI: 63–67) were breeders. Adult survival and productivity were higher in the core than in the periphery, so the population grew more strongly in the core than in the periphery. Differences in adult survival contributed most to the differences in population growth between the two areas. The population viability analysis predicts that the Alpine population will double in 10 years but that an increase in the mortality hazard above 0.055 will lead to a population decline. Unlike the population in the core, the population in the periphery is dependent on further releases at this stage. Bearded vulture reintroductions in the Alps have succeeded in creating a self‐sustaining population with higher reproductive success and similar survival probabilities to the autochthonous Pyrenean population. In general, management should focus on preventing further mortality risks. In the periphery, reducing current mortality and increasing reproductive success are essential to make the population independent of releases.

ERRATUM. Update on successful nesting of bearded vulture (Gypaetus barbatus) in the Lanzo Valleys, Piedmont region (NW Italy)

This erratum corrects the article published in Research in Ornithology, 93 (2): 57-60, 2023 (DOI: 10.4081/rio.2023.690).

Survival Estimation Using Multistate Cormack–Jolly–Seber Models—The Case of the Bearded Vulture Gypaetus barbatus in Spain

The bearded vulture (Gypaetus barbatus) is an endangered species with a specialist osteophagous (bone) diet. We estimated the survival and productivity of this vulture in the Aragonese Pyrenees, where the main population of the species in Europe is found. We used a database covering a period of 33 years (1987–2020). To estimate the probability of survival, we used Cormack–Jolly–Seber models with a Bayesian approach. Our models estimated a survival rate of 0.90 ± 0.08 in juveniles, 0.95 ± 0.04 in subadults and 0.92 ± 0.05 in adults. The survival probability increased over the study period in adults and subadults but not in juveniles. By contrast, productivity decreased over the same period. Our study provides updated information on the status of two demographic parameters of great importance to the species and allows us to identify the most vulnerable age classes and to plan conservation actions to improve the situation of the species in a territory that is a donor of specimens for reintroduction projects. The estimated survival values suggest that more caution should be exercised when planning these feeding points according to the use the species makes of them.

Gamification of Participatory Science and Digital Transition in Mountain Areas: The Case of the Mercantour Bearded Vulture Network

Gamification of Participatory Science and Digital Transition in Mountain Areas: The Case of the Mercantour Bearded Vulture Network

Update on successful nesting of bearded vulture (<i>Gypaetus barbatus</i>) in the Lanzo Valleys, Piedmont region (NW Italy)

Since the first successful nesting of bearded vulture (Gypaetus barbatus) in the Piedmont region, which took place in the Lanzo Valleys in the province of Turin during the 2018-2019 breeding season, with the fledging of the juvenile named “Belavrì” (W288), three other juveniles fledged in the following years at the same nesting site: “Maurich” (W365), “Chateaux” (W413) and “Eolo” (W490). Thus, the number of successful breedings in this area increased to 4 from the beginning of the international reintroduction project and we note the exceptional young age of the female during the first recorded breeding (4cy).

HEALTH ASSESSMENT OF CAPTIVE BEARDED VULTURES (GYPAETUS BARBATUS) IN CATALONIA (SPAIN).

Bearded vulture (Gypaetus barbatus) populations are declining worldwide primarily due to anthropogenic factors. A captive breeding program has been established in Spain, a country with one of the largest free-living populations in Europe, to further enhance the conservation efforts of this emblematic species. However, captive vulture populations can be exposed to different risks through food, such as drug residues and antimicrobial-resistant (AMR) bacteria. Health surveillance of species involved in captive breeding programs is important to face introduction of healthy animals in situ and to obtain baseline clinical data. The objective of this study was to assess the general health status of bearded vultures held in captivity in Catalonia (northeastern Spain) by carrying out hematologic, biochemical, toxicologic, and bacteriologic analyses. A total of 16 bearded vultures were sampled; the data obtained from one vulture, with a chronic tibiotarsal fracture, were excluded from the statistical analysis. Hematologic and biochemical parameters of the bearded vultures were mostly within the range of standard values as stated in previous studies. Basal feather and serum corticosterone levels were analyzed and described for the first time in this species. A total of 15 Escherichia coli isolates were obtained that were resistant to fluoroquinolones (80%), tetracycline (60%), trimethoprim and ampicillin (40%), sulfamethoxazole (33%), and colistin (20%), with 40% of them being multidrug resistant. Three of 15 isolates were carriers of the mcr-1 gene. Only the injured bird previously treated with enrofloxacin was positive for fluoroquinolone residues. Periodic monitoring for the presence of AMR bacteria would be recommended in captive breeding programs as a preventive action to establish future therapies.

First report of Sarcocystis halieti (Apicomplexa) in bearded vulture (Gypaetus barbatus)

At least three Sarcocystis species (S. falcatula, S. halieti and S. wobeseri–like) have been detected infecting raptorial birds. By histopathology and PCR-sequencing of the ITS1 marker, S. halieti was detected in a bearded vulture (Gypaetus barbatus) and a black kite (Milvus migrans) from the Catalonia region in North Spain. The 241 bp-long sequences obtained from the Sarcocystis organisms detected in both raptors showed 97.5–99.6% and 97.9–100% similarity with those of previously identified S. halieti; also, the phylogenetic trees generated placed the identified sequences together with other sequences of S. halieti available in GenBank. In sum, the description of the bearded vulture as a new intermediate host for S. halieti adds new insights on the complex epidemiology of the genus involving avian hosts.

New Insights into the Cosmetic Behaviour of Bearded Vultures: Ferruginous Springs Are Shared Sequentially.

Different hypotheses have been proposed to explain the function of cosmetic behaviour of bearded vultures, being the signalling individual dominance status the most accepted. However, no advances have been made in understanding this mysterious behaviour, in part due to the secrecy of this species. With the help of camera traps and GPS devices we monitored the use of a ferruginous spring in the Pyrenees (Spain) providing new insights into this aspect of their behavioural ecology. Most of the visits (93.5%) involved a single bearded vulture and bathing behaviour only occurred when a single individual was present, confirming their secretive behaviour. A total of 50% of individuals that visited the site were non-adults, suggesting that cosmetic coloration functions as an attenuating signal that may also benefit subordinate individuals. Future studies with the help of new technologies could help to disentangle some questions about the real function of cosmetic coloration and their social relevance.

Pentobarbital intoxication as a potential underlying cause for electrocution in a bearded vulture.

A bearded vulture (Gypaetus barbatus) found dead in northern Spain presented external lesions consistent with electrocution as the cause of death. During forensic examination, macroscopic lesions suggested potential comorbidity, so samples were collected for molecular and toxicological analyses. Gastric content and liver were analysed for toxic substances, and pentobarbital (a common pharmaceutical used for euthanasia in domestic animals) was detected at a concentration of 37.3 and 0.05µg/g, respectively. Other toxicological, viral and endoparasite analyses (avian malaria, avian influenza and flaviviruses) were negative. Thus, although the cause of death was electrocution, pentobarbital intoxication likely impaired the equilibrium and reflexes of the individual, possibly causing the bird to contact energized wires that it would not have otherwise. These results underline the importance of comprehensive analysis of forensic cases of wildlife deaths and reveal barbiturate poisoning as an additional threat for the conservation of the bearded vulture in Europe.

Modeling global habitat suitability and environmental predictor of distribution of a Near Threatened avian scavenger at a high spatial resolution

Vultures are among the most vulnerable birds in the world. The bearded vulture (Gypaetus barbatus) is among the threatened species of vultures and listed as Near Threatened. The species is widely distributed across the Palearctic, Afrotropical, and Indomalayan regions. The species faces several threats such as poisoning, direct persecution, habitat degradation, and collisions with powerlines and wind power farms. Thus, knowing the global habitat suitability of the species and environmental predictors of the species distribution can facilitate the species conservation. In this study, we applied a maximum entropy approach, 10,585 distribution records, and 10 environmental variables to model the bearded vulture's global habitat suitability at high spatial resolution [30-arc-second (1 km)]. We also estimated protected area coverage for the species' suitable habitats. We identified 8,117,231 km2 of suitable habitat for the species across its global range in Europe, Asia, and Africa. The results showed that topographic diversity is the most important predictor of the species distribution across its distribution range. Results of estimating the area of suitable habitats of the bearded vulture within protected areas revealed that only 16.26% of the species' suitable habitats are protected. The areas that were identified to have the highest suitability for the species have high priority for the conservation of this iconic species thus these areas should be included in the network of protected areas.

Detailed morphological structure and phylogenetic relationships of Degeeriella punctifer (Phthiraptera: Philopteridae), a parasite of the bearded vulture Gypaetus barbatus (Accipitriformes: Accipitridae)

Habitat loss is one of the main threats to species survival and, in the case of parasites, it is their hosts that provide their habitat. Therefore, extinction even at local scale of host taxa also implies the extinction of their parasites in a process known as co-extinction. This is the case of the bearded vulture (Gypaetus barbatus), which almost became extinct at the beginning of the twentieth century. After several attempts, this species was successfully reintroduced into the Alps at the end of the twentieth century. We collected 25 lice specimens from an electrocuted bearded vulture from Susa (Italian Alps) that were morphologically identified as Degeeriella punctifer. Six individuals were studied by scanning electron microscopy, with particular emphasis on their cephalic sensorial structures, while four further specimens were characterized at molecular level by amplifying partial regions of the 12SrRNA, COX1 and elongation factor 1 alpha (EF-1) genes. From a morphological perspective, the number, type and arrangement of the sensillae on the two distal antennal segments is quite similar to that of other species of the family Philopteridae (Phthiraptera: Ischnocera). The mandibles and tarsal claws allow lice to cling firmly to their host’s feathers. Phylogenetic analyses help unravel the paraphyletic nature of the genus Degeeriella and demonstrate the clear differentiation between lice parasitizing Accipitriformes and Falconiformes, as well as the close relationship between D. punctifer, D. fulva, D. nisus and Capraiella sp. that, along with other genera, parasitize rollers (Aves: Coraciiformes).

The characterization of bearded vulture (Gypaetus barbatus) coprolites in the archaeological record

The archaeological record of the Lagar Velho rock shelter (Lapedo Valley, Leiria, Portugal) bears testimony to several significant Upper Palaeolithic occupations, most notably the Lapedo Child burial (LV1) dating from the Gravettian. Excavations undertaken at the site since 2018 have seen the recovery of a large quantity of coprolites, above all in layer 143 (c. 29 ka cal BP). The study of these fossilized remains points to the bearded vulture (Gypaetus barbatus) as the main coprogenic agent and provides the first descriptions of these avian coprolites in archaeological assemblages. The analyses reported involved the comparison of the coprogenic samples with modern bearded vulture scats. A new morphotype is proposed for discriminating the faeces of this avian scavenger based on (1) macroscopic analyses, (2) morphometric comparisons with other fossil and modern scats and (3) their mineralogical and elemental composition. Among the criteria proposed here to identify the coprolites of the bearded vulture are their cylindrical shape, diameter, pointed extremities and homogeneous porous texture, as well as their massive internal texture, hard consistency and total absence of bone inclusions (attributable in all likelihood to a high digastric juice acidity capable of dissolving bones). Our results indicate that, as well as being used by humans for short-term stays, the Lagar Velho rock shelter was used by the bearded vulture as a nesting site. We provide new evidence from Iberia of the activity of this avian scavenger as a bone accumulator in archaeological sites.

Moni­toring of exposure to toxins in raptors in Albania

Raptors are large carnivorous birds, most well known for their scavenging nature. This study evaluates the level of exposure to toxins in raptors and vultures in Albania to assess whether existing legislation and regulations are effectively protecting vultures and other wildlife in Albania. During 2014-2018, at the Wildlife Animals Laboratory, Agriculture University of Tirana, Albania, 35 birds (Circaetus gallicus, Gyps fulvus, Gypaetus barbatus) were tested for exposure to toxins. The results indicated elevated blood lead levels in 65.7% of sampled raptors, while in 17.1% there was evidence of exposure to the non-steroidal anti-inflammatory drug (NSAID) diclofenac, based on visceral gout and the presence of cases with high serum uric acid concentration. Other injuries were found in 17.1% of raptors, with the most frequent being physical damage, traumatic injuries, or fractures caused by farmers, shooting, electric burn injuries from electrocution, injuries from collisions, etc. The results suggest that lead poisoning in raptors could be one of the main reasons for the observed declines in vulture populations in Albania. Furthermore, the apparent evidence for exposure to NSAIDs is concerning and requires further investigation.

Миграция хищных птиц через Западный Кавказ в осенний период

Миграция хищных птиц через Западный Кавказ в осенний период

Study of Breeding and Migrations of the Golden Eagle in Mongolia

Golden Eagles (Aquila chrysaetos) play a crucial role in the ecosystems of the Bayan-Ulgii province and its neighboring regions. Our research focuses on the comprehensive survey of Golden Eagle nests and study of their migration patterns via the satellite tracking, providing valuable insights into population dynamics and migratory behaviors. In the years 2021 and 2022, we accomplished an extensive search for Golden Eagle eyries across 13 diverse counties in Bayan-Ulgii province, including Altai, Altantsugts, Bayannuur, Bayan-Ulgii, Bugat, Deluun, Erdeneburen, Nogoonnuur, Sagsai, Tolbo, Tsagaannuur, Tsengel, and Ulaankhus. This collaborative effort in partnership with local communities and herders allowed us to identify and document a total of 75 Golden Eagle nests, with 49 being active during this two-year period. To deepen our understanding of these majestic birds, a satellite tracking program was started in September 2019 during the Ulaankhus Eagle Festival. Through GPS tagging, we monitored the migration of five Golden Eagles, previously used in Kazakh falconry and subsequently released. This tracking initiative provided us with valuable data on their movements and behaviors, shedding light on their survival challenges and migration routes. Our research not only contributes to the conservation efforts of Golden Eagles but also enhances our understanding of the interconnectedness of various raptor species within the region, including Bearded Vultures (Gypaetus barbatus), Cinereous Vultures (Aegypius monachus), Black Kites (Milvus migrans), Steppe Eagles (Aquila nipalensis), Peregrine Falcons (Falco peregrinus), and Saker Falcons (Falco cherrug). The study of these species in their natural habitats enriches our understanding of the intricate ecological dynamics at play. By sharing our findings, we aim to foster a deeper appreciation for these iconic birds and promote their conservation in the Bayan-Ulgii province and beyond. Our presentation will highlight the results of our Golden Eagle nest survey and tracking, emphasizing the importance of community involvement in wildlife research and conservation.

Modelling the nesting-habitat of threatened vulture species in the caucasus: An ecosystem approach to formalising environmental factors in species distribution models

Abiotic factors play an important role in species localisation, but biotic and anthropogenic predictors must also be considered in distribution modelling for models to be biologically meaningful. In this study, we formalised the biotic predictors of nesting sites for four threatened Caucasian vultures by including species distribution models (wild ungulates, nesting tree species) as biotic layers in the vulture Maxent models. Maxent was applied in the R dismo package and the best set of the model parameters were defined in the R ENMeval package. Performance metrics were continuous Boyce index, Akaike's information criterion, the area under receiver operating curve and true skill statistics. We also calculated and evaluated the null models. Kernel density estimation method was applied to assess the overlap of vulture ecological niches in the environmental space. The accessibility of anthropogenic food resources was estimated using the Path Distance measure that considers elevation gradient. The availability of pine forests (Scots Pine) and wild ungulates (Alpine Chamois and Caucasian Goat) contributed the most (29.6% and 34.3%) to Cinereous Vulture (Aegypius monachus) nesting site model. Wild ungulate distribution also contributed significantly (about 46%) to the Bearded Vulture (Gypaetus barbatus) model. This scavenger nests in the highlands of the Caucasus at a minimum distance of 5–10 ​km from anthropogenic facilities. In contrast, livestock as a food source was most important in colony distribution of Griffon Vulture (Gyps fulvus). The contribution of distances to settlements and agricultural facilities to the model was 45%. The optimal distance from Egyptian Vulture (Neophron percnopterus) nesting sites to settlements was only 3–10 ​km, to livestock facilities no more than 15 ​km with the factor contribution of about 57%. Excluding the wild ungulate availability, the ecological niches of studied vultures overlapped significantly. Despite similar foraging and nesting requirements, Caucasian vultures are not pronounced nesting and trophic competitors due to the abundance of nesting sites, anthropogenic food sources and successful niche sharing.

Breeding and Migratory Bird Diversity in Iğdır Province (Eastern Anatolia)

The aim of this study was to contribute to the knowledge of avian diversity and breeding species in Türkiye. Observations were carried out in Iğdır Province within a total of 40 days spread throughout the migration and breeding periods of 2017-2018. Regional status and breeding codes were determined for each species. Some winter visitors have also been observed during the early stages of the spring migration. In the study, 192 species were identified belonging to 50 families from 20 orders and 58 residents, 83 summer visitors, 11 winter visitors, and 40 transit migratory birds. According to the result of the recording breeding behavior, 52 bird species were classified as confirmed breeders, 36 as probable breeders, and 70 as possible breeders. According to IUCN Red List, 10 globally threatened species (Haematopus ostralegus, Vanellus vanellus, Numenius arquata, Gallinago media, Gypaetus barbatus, Aegypius monachus, Circus macrourus, Aythya ferina, Streptopelia turtur, Neophron percnopterus) were observed. Aras Valley and Aralık-Karasu Wetlands are the most important areas for birds. The conservation of these areas is of high importance in the region for migratory birds.