European Bee-eaters Merops Apiaster Research Articles

Feeding on migratory butterflies: opportunistic observations of birds preying on the Painted Lady Vanessa cardui

Many butterfly species are often seen with severe wing damage, which is regarded as evidence of unsuccessful predation, most likely by insectivorous birds. However, observations of bird predation are rare for the vast majority of butterflies. During a long-term study of the ecology of the Painted Lady Vanessa cardui, a common migratory butterfly, a high frequency of wing damage was noted, especially in North African populations. Attacks by several bird species were confirmed during fieldwork which, along with a number of published and unpublished records from ornithological colleagues, are reported in this note. Twenty-four bird species have been recorded preying on the Painted Lady in the Palaearctic-Afrotropical region. Records from eight additional species from the Nearctic region were obtained from photographs and from the literature. With 16 families (13 passerines and three non-passerines), this bird community embraces a notable diversity of morphologies and prey-capture techniques. The most represented families were the Tyrannidae, the Sylviidae and the Turdidae while the species most frequently recorded as predators were European Bee-eater Merops apiaster, Blue-cheeked Bee-eater Merops persicus, White-crowned Wheater Oenanthe leucopyga, and Cattle Egret Bubulcus ibis. Most observations occurred in March–April and October when the Painted Lady migrates in large numbers, suggesting that a sudden increase in abundance may lead to a regular use of this resource by predators. Moreover, unsuccessful attacks are common, which suggests that butterflies may quite often escape with some form of wing damage. The consequences these interactions have on butterfly populations are speculative but deserve further study.

The conflict between avian predators and domestic honey bees: a case study of European bee-eater (Merops apiaster L.) preying on the honey bee (Apis mellifera L.) in Cyprus

Bee-eaters are protected birds due to their contribution to the ecosystem, but at the same time, they inflict damages on bees which cause conflicts with beekeepers. This research aimed to study the impact of bee-eaters on the foraging activity of the honey bee (Apis mellifera L.) and the effectiveness of the applied control measures, proposing a solution for the coexistence of birds and bees. We discouraged bee-eaters by using different methods and testing their efficacy. The presence of bee-eaters around the apiary caused the reduction of honey bee foraging activity along with effects on brood rearing and temperature regulation of the hive. The so-far proposed measures to prevent bee-eaters' attacks in the apiaries were tested and found to have limited effect. Considering the role of honey bees in pollination and bee-eaters in the insect-bird food chains, we propose a harmonious coexistence of bees and birds. This strategy has been adopted by the beekeepers of Cyprus, who were committed to pursuing methods of limited protection of bees from the predatory birds, ensuring the survival of both components.

Linking migratory performance to breeding phenology and productivity in an Afro-Palearctic long-distance migrant

Understanding the relationship between migratory performance and fitness is crucial for predicting population dynamics of migratory species. In this study, we used geolocators to explore migration performance (speed and duration of migratory movements, migratory timings) and its association with breeding phenology and productivity in an Afro-Palearctic insectivore, the European bee-eater (Merops apiaster), breeding in Iberian Peninsula. Bee-eaters migrated at higher travel speeds and had shorter travel duration in spring compared to autumn. Individuals that departed earlier or spent fewer days in-flight arrived earlier to the breeding areas. Our results show overall positive, but year-specific, linkages between arrival and laying dates. In one year, laying was earlier and productivity was higher, remaining constant throughout the season, while in the subsequent year productivity was lower and, importantly, declined with laying date. These results suggest that arriving earlier can be advantageous for bee-eaters, as in years when breeding conditions are favourable, early and late breeders produce high and similar number of fledglings, but when conditions are unfavourable only early breeders experience high productivity levels.

Орнітофауна лучних екосистем у прикордонних районах Львівщини та Волині

Meadow ecosystems comprise a significant part of the area of Ukraine, especially in its western regions. Those ecosystems are subjects of concern today because of the active agricultural use and droughts that also threatens the animal population of meadows, including birds. Studies of meadow bird species of western Ukraine are limited to atlases, which results in a lack of precise data. This work was part of an international project on the conservation of the great snipe Gallinago media and allowed us to collect valuable data on the abundance and occurrence of meadow bird species nearby to the Polish and Belarusian borders of Ukraine — territories that are commonly ignored by Ukrainian researchers. The surveys of meadow birds conducted near the Ukrainian-Polish border in 2020 have shown that the general state of the marshes is worse compared to 2019: even close to the Western Bug river, only deep oxbow lakes were wet or contained some water, but minor lakes and wetlands of the valley were found to be dry. In total, we observed 141 bird species belonging to 17 orders. Among them, 26 were common by abundance and frequency, such as the great egret Ardea alba, the white stork Ciconia ciconia, the common quail Coturnix coturnix, the corn crake Crex crex, the northern lapwing Vanellus vanellus, the common redshank Tringa totanus, the common cuckoo Cuculus canorus, the Eurasian skylark Alauda arvensis, the meadow pipit Anthus pratensis, the western yellow wagtail Motacilla flava, the sedge warbler Acrocephalus schoenobaenus, the marsh warbler A. palustris, the great reed warbler A. arundinaceus, the common whitethroat Sylvia communis, the whinchat Saxicola rubetra, the thrush nightingale Luscinia luscinia, the common linnet Linaria cannabina, the corn bunting Emberiza calandra, the common reed bunting E. schoeniclus, and 7 more species, which were observed frequently though are not typical marshland species. We have identified the species that can be used as indicators of parameters of marsh ecosystems such as grass height (corn crake, western yellow wagtail, and sedge warbler), moisture (common redshank, common cuckoo, and the sedge and great reed warblers), and habitat type (corn crake, European bee-eater Merops apiaster, sedge warbler, common reed, and corn buntings).

Acoustic Monitoring of Diurnally Migrating European Bee-Eaters Agrees with Data Derived from Citizen Science

The use of Autonomous Recording Units (ARUs) for wildlife monitoring has increased in recent years. Acoustic monitoring has been used for a wide range of research topics, but it has rarely been used for monitoring wildlife migrations. In this work we evaluate the use of acoustic monitoring to characterise the diurnal migration pattern of a bird species, the European Bee-eater Merops apiaster. We set up 3–4 acoustic monitoring stations daily from 11 August to 21 September 2017 in north-eastern Spain, during post-breeding migration of the species. We used the Vocal Activity Rate (VAR), defined as the number of calls per unit time, as an index of Bee-eater abundance to describe the daily and seasonal migration pattern of the species. We also assessed the relationship between daily mean VAR estimated by ARUs, with citizen science data uploaded to the platform Ornitho.cat over a large spatial scale. According to mean VAR, intensity of migration increased weekly until the last week of August when it peaked, with species abundance decreasing to the lowest values in the study area by late September. A significantly higher number of calls was detected in the first and last hours of the day. Our results agree with previously published seasonal and daily migration patterns described for the species. VAR was significantly, positively correlated with the percentage of citizen science records of Bee-eater uploaded to complete checklists, used as an independent source to compare migration timing. Overall, our results, validated through citizen science data, show that acoustic monitoring can effectively provide complementary data for monitoring the bird migration of vocally active species. The use of ARUs may help to improve our understanding of migratory behaviour and be useful for a wide range of purposes.

Space Use and Daily Movement Patterns of the European Bee-Eater Merops apiaster during Breeding and Post-Breeding

In July 2016, six European Bee-eaters Merops apiaster were tagged with radio transmitters in order to determine their space use during breeding and post-breeding. During breeding, home-range sizes were 2.0–5.5 km2 (95% kernel contour of minimum convex polygon, MCP95) and the median distance between position points and the nesting burrow was 0.20 km (Q1–Q3: 0.10–0.38 km). After Bee-eaters had fledged, adult birds increased their home range to 10.6–175.2 km2 (MCP95) and the median moving distance to the nesting burrow to 3.90 km (Q1–Q3: 1.83–5.25 km). In the last study week, two birds always flew together in larger flocks, while other tagged birds used other locations, this may indicate stable foraging groups of birds from different colonies. Space use was significantly influenced only by cloudiness during breeding and not by temperature or precipitation. In the early breeding season, only males stayed overnight in roosting trees; subsequently, both males and females stayed there. From about the end of the second week after hatching no adult birds were in the breeding colony at night. The results of this pilot study must however be verified with a broader-scaled study approach.

The discriminant power of biometrics for sex determination in European Bee-eaters Merops apiaster

ABSTRACT Capsule A combination of several biometric measures enables the reliable sexing of the European Bee-eater Merops apiaster, a species with subtle sex differences in plumage and morphometry. Aims To explore variation in biometrics and their suitability to discriminate sex in adult European Bee-eaters Merops apiaster. Methods We sampled populations of a long-distance migratory species with low sexual size dimorphism, the European Bee-eater Merops apiaster, from colonies in western Iberia (Portugal) and Central Europe (Germany) to investigate body size variation and derive population-specific and general sex discriminant functions. Results Overall, male Bee-eaters were larger than females while Bee-eaters from Germany and Portugal did not differ in size, except for primary length and tail length. The best single measurement to discriminate sex was wing length for Portuguese birds and tail tip length for German birds, as in the combined dataset. Multivariate discriminant functions of head-bill, wing and tail tip lengths provided the highest discriminant accuracy, discriminating sex for 91% of the birds from Portugal, 96% from Germany and 94% when using the combined dataset. Nonetheless, the discriminant accuracy remained high in the functions using only two variables for Portugal (head-bill and tail tip 91%, head-bill and wing 88%, wing and tail tip 88%), Germany (head-bill and tail tip 95%, wing and tail tip 97%) and in the combined dataset (head-bill and tail tip 92%, wing and tail tip 93%). Conclusions Population specific discriminant functions allow sexing of European Bee-eaters by morphometry with high degree of accuracy at least for Iberia and Central European populations. Such discriminant functions can be used to assign the sex of adult Bee-eaters reliably and swiftly while the bird is still in the hand, highlighting the potential of these functions for rapidly sexing species with low degrees of sexual size and plumage dimorphism.

European bee-eaters (Merops apiaster) and apiculture: understanding their interactions and the usefulness of nonlethal techniques to prevent damage at apiaries

Finding a balance between wildlife conservation and land use protection when conflicts arise requires applying measures based on scientific knowledge and applicability. This is because of the complexity of interactions and the social dimensions of human–wildlife relationships. One of the conflicts in the Mediterranean basin is between European bee-eaters Merops apiaster and beekeeping. The objective of this study was to evaluate the activity of bee-eaters in relation to honey bees Apis mellifera in Extremadura (W Spain), and the possible correlation with traits and viability of beehives. We also aimed to assess the effectiveness of damage prevention measures, to be able to predict whether they could assist in the future sustainability of apicultural management. A monitoring program was conducted in 58 apiaries to observe bee and bee-eater activity and abundance. Additionally, we measured the effect of environmental variables and the amount of resources in the hives, by means of honey, pollen, and brood. We found that bee-eater negatively correlated to honey bee activity and the more abundant it was the fewer resources (honey, pollen, and brood) and lower abundance of bees in the hives, mainly during their migratory season (August). However, there were no negative effects on the survival and viability of the hives. The preventive and deterrent measures offered promising results, especially the installation of shading meshes around the apiary that prevented the predation of bees in the immediate surroundings of the beehives. Further studies on the effectiveness of preventive techniques and their practical implementation through different mechanisms of economic compensation must be enhanced to reduce this social conflict.

Mist-Netting of Migrating Bee-Eaters Positively Influences Honey Bee Colony Performance

Abstract Bee-eaters (Meropidae) are considered agricultural pests and their presence provokes conflicts with beekeepers and farmers who rely on the pollination services of honey bees. This problem is often deal with through the mass killing of the birds, even though the quantitative evidence on the impact of bee-eaters on honey bee colonies is scarce. The current paper reports the performance of honey bee colonies protected with mist nets from migrating flocks of European bee-eaters Merops apiaster in Israel. In the study the weight gains of bee hives surrounded by mist nets were 6.44 times higher than that of unprotected hives (26.4 kg vs. 4.1 kg). The results confirmed that bee-eaters locally pose a problem to apiaries and potentially to the crops that require pollination. Mist- netting appeared to be an effective mitigation method for alleviating conflicts between beekeepers and bee-eaters. However, the study also showed that bees were able to differentiate between their main predator and other avian species trapped in mist nets and stung only bee-eaters. Moreover, the bees were targeting the most vulnerable body parts of birds which resulted in some bird fatalities. Therefore, due to accidental mortal- ity of birds, mist-netting is recommended only on the migratory routes in cases when bee hives cannot be moved to other areas.

Effect of European Bee-Eater (Merops Apiaster) on Honeybee Colonies in Toshka Region, Egypt

Effect of European Bee-Eater (Merops Apiaster) on Honeybee Colonies in Toshka Region, Egypt

Castosyringophilus meropis sp. n. (Acariformes: Syringophilidae) - a new quill mite species parasitising the world population of Merops apiaster Linnaeus (Coraciiformes: Meropidae).

A new species, Castosyringophilus meropis sp. n., found in quills of feathers of the European bee-eater Merops apiaster Linnaeus (Coraciiformes: Meropidae) is described. This new species is close to C. claravis Skoracki et Glowska, 2008 and differs, in females, by the presence apunctate coxal fields (vs sparsely punctate in C. claravis) and by the lengths of setae d1 145-180 µm, f2 170-185 µm and ag3 190-215 µm (vs d1 200-220 µm, f2 230-250 µm and ag3 150-170 µm). We present a vast mite material collected from bee-eaters originated from different localities in Europe, Asia and Africa, both breeding and wintering grounds of this bird. It indicates that the whole world population of the European bee-eater is parasitised by this quill mite species.

Management-Related Traffic as a Stressor Eliciting Parental Care in a Roadside-Nesting Bird: The European Bee-Eater Merops apiaster.

Traffic is often acknowledged as a threat to biodiversity, but its effects have been mostly studied on roads subjected to high traffic intensity. The impact of lower traffic intensity such as those affecting protected areas is generally neglected, but conservation-oriented activities entailing motorized traffic could paradoxically transform suitable habitats into ecological traps. Here we questioned whether roadside-nesting bee-eaters Merops apiaster perceived low traffic intensity as a stressor eliciting risk-avoidance behaviors (alarm calls and flock flushes) and reducing parental care. Comparisons were established within Doñana National Park (Spain), between birds exposed to either negligible traffic (ca. 0–10 vehicles per day) or low traffic intensity (ca. 10–90 vehicles per day) associated to management and research activities. The frequencies of alarm calls and flock flushes were greater in areas of higher traffic intensity, which resulted in direct mortality at moderate vehicle speeds (≤ 40 km/h). Parental feeding rates paralleled changes in traffic intensity, but contrary to our predictions. Indeed, feeding rates were highest in traffic-exposed nests, during working days and traffic rush-hours. Traffic-avoidance responses were systematic and likely involved costs (energy expenditure and mortality), but vehicle transit positively influenced the reproductive performance of bee-eaters through an increase of nestling feeding rates. Because the expected outcome of traffic on individual performance can be opposed when responses are monitored during mating (i.e. negative effect by increase of alarm calls and flock flushes) or nestling-feeding period (i.e. at least short-term positive effect by increase of nestling feeding rates), caution should be taken before inferring fitness consequences only from isolated behaviors or specific life history stages.

Population genetic structure and long-distance dispersal of a recently expanding migratory bird

Long-distance dispersal events and their derivable increases of genetic diversity have been highlighted as important ecological and evolutionary determinants that improve performances of range-expanding species. In the context of global environmental change, specific dispersal strategies have to be understood and foreseen if we like to prevent general biodiversity impoverishment or the spread of allochthonous diseases. We explored the genetic structure and potential population mixing on the recently range-expanding European bee-eater Merops apiaster. In addition, the species is suspected of harbouring and disseminating the most relevant disease for bees and apiculture, Nosema microsporidia. In agreement with complementary ringing recovery data and morphometric measurements, genetic results on two mitochondrial genes and 12 microsatellites showed a reasonably well-structured population partitioning along its breeding distribution. Microsatellite results indicated that not only did a few birds recently disperse long distance during their return migrations and change their natal breeding areas, but also that a group of allochthonous birds together founded a new colony. Although we did not provide evidence on the direct implication of birds in the widespread of Nosema parasites, our finding on the long-distance dispersal of bird flocks between remote breeding colonies adds concern about the role of European bee-eaters in the spread of such disease at a large, inter-continental scale.

Consumption of honey bees by Merops apiaster Linnaeus, 1758 (Aves: Meropidae) in Mediterranean semiarid landscapes: a threat to beekeeping?

The diet of several European bee-eater Merops apiaster colonies was studied in the Murcia Region (SE Spain) during the spring and summer of 2009, in order to assess their predation on the honey bee Apis mellifera. The examination of invertebrate remains found in pellets revealed the dominance of Hymenoptera and Coleoptera in the average diet, and a similar consumption of honey bees compared to other species of Hymenoptera. The number of honey bees and other Hymenoptera recorded in the pellets varied both spatially (between locations) and temporally (along the main reproductive phases). On average, it was estimated that a single bee-eater consumed 1333.39 ± 759.8 honey bees during its complete stay in the region, far below the theoretical regeneration capacity of a single honey bee colony (36,000–45,000 honey bees per month from April to July). Consequently, under normal circumstances the effect of bee-eater predation on local apiaries appears negligible, and partially dependent on the availability of alternative prey.

New data on the species Metacheyletia degenerata Fain and Bochkov (Acariformes: Cheyletidae)

Metacheyletia degenerata Fain and Bochkov, 2003 (Acariformes: Cheyletidae) is recorded for the first time from the quills of the European Bee-eater Merops apiaster L., 1758 (Coraciformes: Meropidae). It is also the first record of Metacheyletia found on coraciiform birds. Moreover, the following localities: Macedonia, Italy, Azerbaijan, Russia and Tanzania, are new for M. degenerata.

Determinants of between-year burrow re-occupation in a colony of the European bee-eater Merops apiaster.

Re-occupation of existing nesting burrows in the European bee-eater Merops apiaster has only rarely – and if so mostly anecdotically – been documented in the literature record, although such behavior would substantially save time and energy. In this study, we quantify burrow re-occupation in a German colony over a period of eleven years and identify ecological variables determining reuse probability. Of 179 recorded broods, 54% took place in a reused burrow and the overall probability that one of 75 individually recognized burrows would be reused in a given subsequent year was estimated as 26.4%. This indicates that between-year burrow reuse is a common behavior in the study colony which contrasts with findings from studies in other colonies. Furthermore, burrow re-occupation probability declined highly significantly with increasing age of the breeding wall. Statistical separation of within- and between-burrow effects of the age of the breeding wall revealed that a decline in re-occupation probability with individual burrow age was responsible for this and not a selective disappearance of burrows with high re-occupation probability over time. Limited duty cycles of individual burrows may be caused by accumulating detritus or decreasing stability with increasing burrow age. Alternatively, burrow fidelity may presuppose pair fidelity which may also explain the observed restricted burrow reuse duty cycles. A consequent next step would be to extend our within-colony approach to other colonies and compare the ecological circumstances under which bee-eaters reuse breeding burrows.

Strong cascading effect of weather conditions on prey availability and annual breeding performance in European bee-eaters Merops apiaster

Aerial insectivorous birds depend highly on favourable weather conditions for successful foraging because flight activity of insects is constrained by daily weather. Thus, the variation in weather conditions during reproduction, mediated by prey limitations, should be mirrored in annual reproduction performance, and finally in annual breeding success. We analysed the effect of local weather conditions on the availability of airborne insects and on the variation in brood size and nestling condition of European bee-eaters Merops apiaster at the northern edge of their range where years with adverse weather frequently occur. The availability of large flying insects, the common prey of bee-eaters, increased with air temperatures and duration of daily sunshine. As predicted, local weather conditions affected reproductive performance with annual breeding success (mean 3.7 nestlings per breeding pair, range 1.7–4.9 nestlings) being up to 32 % higher in extraordinary dry and hot summers. Additionally, a nestling's body condition (residual mass) was also affected by sunshine duration during their growth period and internally was co-affected by the number of siblings and the individual rank within the sibling hierarchy. Thus, a prolonged duration of daily sunshine causes a cascade from higher insect flight activity, and, thus, higher food availability for chick-rearing bee-eaters, which finally translates into better chick body conditions and higher annual breeding success. Consequently reproduction and population development of European bee-eaters might be especially susceptible to regional changes in weather and climatic conditions.

Seasonal Shift in the Diet Composition of European Bee-EatersMerops apiasterat the Northern Edge of Distribution

Summary. European bee-eaters Merops apiaster forage almost exclusively on airborne insects caught on the wing. The availability of this food might be temporally limited due to adverse weather conditions, especially at climatically sub-optimal breeding sites. We determined seasonal variation in the diet composition in adult and nestling bee-eaters at the species' northernmost breeding colonies by analysing food remains from pellets and by direct observation. Adult bee-eaters preyed on a wide range of insect species with more than 97% belonging to the taxonomic orders Hymenoptera, Odonata and Coleoptera. We observed consistent seasonal changes in adult diet composition from the pre-incubation to the late chick rearing period. The dry mass proportion of dragonflies decreased remarkably in the adult diet as chick rearing started, whereas the consumption of small Hymenopterans increased by the end of the chick provisioning period. Additionally, we found differences in the diet composition of adults and nestlin...

First Records of the Chewing Lice ( Phthiraptera ) Associated with European Bee Eater ( Merops Apiaster ) in Saudi Arabia

The European bee-eater (Merops apiaster) migrates through Saudi Arabia annually. A total of 25 individuals of this species were captured from three localities in Riyadh and Ta'if. Three species of chewing lice were identified from these birds and newly added to list of Saudi Arabia parasitic lice fauna from 160 lice individuals, Meromenopon meropis of suborder Amblycera, Brueelia apiastri and Meropoecus meropis of suborder Ischnocera. The characteristic feature, identification keys, data on the material examined, synonyms, photo, type and type locality are provide to each species.

Decision making in burrowing birds: Sediment properties in conflict with biological variables

Distribution and properties of loess deposits were recently suggested to drive the presence of burrowing birds: sand martins Riparia riparia, European bee-eaters Merops apiaster, and kingfishers Alcedo spp. Packing density with very low CN (such as those of loess) was suggested to be the most suitable for sand martins and bee-eaters. Correlating the distribution range of particular sediments with nesting areas of the particular burrowing bird species is a great argument in a recent discussion on whether the availability of nest sites is limiting or not. However, biological variables should be also taken into account. Each of the particular species tends to occupy its own ecological niche, avoiding direct competition for space, food, or other resources. Tight adherence to loessic slopes would severely limit two of the three Central European burrowing bird species in their distribution range, even though they are physiologically adapted to utilize a broader range of nest bank substrates. While the European bee-eaters (and perhaps most of the other bee-eater species) are limited to the fine-grained loess and silt, the other two species utilize broader textural range requiring either sufficiently high penetration resistance (Eurasian kingfisher Alcedo atthis) or digging nest holes of limited cross-sectional area (sand martins).