European Bee-eater Merops apiaster Scientific name definitions

Hans-Valentin Bastian and Anita Bastian
Version: 3.0 — Published March 29, 2024

Systematics

Systematics History

Merops apiaster Linnaeus, 1758, Systema naturae, 10th Edition, Tome 1, p. 117. Distribution given as "Europa australi, Oriente" (27).

In his Historia animalium, Aristotle placed Merops, or Aerops, under the Dryocopi, and all ancient authors after him followed this classification for a long time, partly under the name Melissophagus or Phlothros Melissophas (28). In the mid-1700s, 13 species of bee-eaters were listed under the genus "Apiaster" (29); the present Merops apiaster, whose distribution was described as "Habitat in meridionali Europae regione, & quidem in meridionalibus Galliae provinciis" [It lives in the southern part of Europe and in the southern provinces of Gallia], was only called "Apiaster." However, of the 13 species listed by Brisson (29), only seven could be confirmed as bee-eater species by our current taxonomy (30, 29). Some of Brisson's (29) "bee-eaters" were indeed found to be part of Merops, while others were found to be motmots; Apiaster brasiliensis is probably Momotus brasiliensis (now the Amazonian Motmot (Momotus momota)), and Apiaster mexicanus likely refers to the Russet-crowned Motmot (Momotus mexicanus) (29). In the first edition of his Systema naturae, Linnaeus (1735) listed the bee-eaters within the woodpeckers (Picae) as "Ispida;" the name Merops was used for the first time in the 9th edition (31), but it was still listed within "Ispida." In 1758, Merops apiaster was formally described for the first time (27). Linnaeus, as well as Brisson (29), placed bee-eaters together with rollers, kingfishers, and 15 additional genera in the order "Picae."

Phenotypic characteristics of Meropidae, as well as their ecology, have been used to help understand their systematics and taxonomy since the 1800s, and these characters are still used today (30, 32, 33). Recent genomic phylogenetic studies have found that bee-eaters are part of the Coraciiformes, which also includes the Old World-restricted rollers (Coraciidae) and ground-rollers (Brachypteraciidae), the New World todies (Todidae) and motmots (Momotidae), and the cosmopolitan kingfishers (Alcedinidae) (34). Based on genetic, but also fossil data, Meropidae are considered to be more closely related to Coraciidae and Brachypteraciidae than to the other families of the Coraciformes (35, 36, 34).

The taxonomy of the bee-eaters is broadly consistent across the multiple global taxonomies, although there are differences that are supported by current genetic analyses. For instance, 28 species in 3 genera are recognized by the HBW/BirdLife International list (37), while 31 species are recognized by the IOC World Bird List (38) and by the Clements Checklist (39) based on recent work that suggested a split (40; Table 5), albeit with differing numbers of genera.

Geographic Variation

The species is monotypic without phenotypic variability.

Despite the very large distribution, recent phylogenetic studies on mitochondrial and nuclear DNA of individuals from across the Palearctic-African range in Europe, Asia, and Africa revealed low to moderate divergence, surprisingly high genetic variability, and geographic panmixia across the whole distribution (41, 42, 43, 40 ), indicating extensive gene flow in the past as well as recent connectivity (42, 40). The South African breeding population did not differ strongly genetically from individuals from Europe and Asia, despite its different breeding and migration patterns (43).

Ramos et al. (42) suggested that the weak genetic differentiation among European Bee-eater populations is likely due to their strong dispersal ability; it is suggested that long-distance dispersal events explain the similar genetic patterns of individuals from widely separated populations (42). Although this contradicts recent studies on group structure, dynamics, and cohesion during migration and in non-breeding areas (44, 45, 46), changes in group structure have also been shown, which may lead to long-distance dispersal events. In addition to long-distance dispersal events, historical climate variability is another explanation for panmixia in the European Bee-eater (43, 40). Under this scenario, bee-eaters repeatedly retreated to areas in the Mediterranean and subtropical Africa and Asia during the ice ages, and then expanded their breeding distribution northward again during the warm periods. Widespread gene flow across its range as a result of climate-induced range change appears to continue today (43, 40).

Despite the overall lack of differentiation, however, there is some support for genetic clustering of populations from Europe and Asia (42, 43). While one study found slight differences in genotypes between populations from western Europe and western Asia (43), another study suggested there were also slight differences between populations from eastern Europe and central Asia (42). These differences may reflect different migration routes (44, 45) and may be important for future genetic differentiation (43, 40).

Subspecies

Monotypic.

Related Species

The systematic classification of bee-eater species has been conducted in a number of ways, including using plumage differences (33), morphological and ecological characters (47), or genetic data (48, 41, 49, 50, 51, 43). Despite the number of studies that have investigated the relationships among bee-eaters, relationships are still not well-resolved, and further research is needed (43, 40).

In one early study using morphological, biogeographical, ecological, and behavioral characters, the European Bee-eater appeared to be most closely related to both the Blue-throated Bee-eater (Merops viridis) and Chestnut-headed Bee-eater (Merops leschenaulti) (47). However, in another study that used variations in plumage color, pattern, and shape, as well as biogeographical distribution patterns, it was difficult to resolve the closest relatives of the European Bee-eater (33).

A more recent phylogeny of bee-eaters that included 25 of the 28 currently recognized species was reconstructed using nuclear and mitochondrial DNA sequence data. In this study, the European Bee-eater appeared to be sister to the Australian Rainbow Bee-eater (Merops ornatus). These two species were in turn sister to three species, including the Madagascar Bee-eater (Merops superciliosus), Blue-cheeked Bee-eater (Merops persicus), and Blue-tailed Bee-eater (Merops philippinus) (41). This relationship was further supported in a study using mitochondrial DNA that date the split between the European Bee-eater and Rainbow Bee-eater at about 2 million years ago during the Pleistocene (40). The establishment of the current haplotype lineages of the European Bee-eater has been dated to the middle Pleistocene about 0.6 Mya (43). The relationships recovered in Marks et al. (41) has not been supported in all studies, however. In another phylogeny using one mitochondrial gene, the European Bee-eater was instead sister to the Rosy Bee-eater (Merops malimbicus) (43); this study did not sample all Merops species, however, including the Rainbow Bee-eater.

Hybridization

No hybridization known.

Nomenclature

The generic name "Merops" comes from ancient Greek mythology, and is associated with Merops, king of an ancient kingdom and mentor to the more famous king of Troy, Priamos. The species name "apiaster" is derived from the Latin term for bee, apes, and edere, to eat, translating to "bee-eater."

Fossil History

In Austria, an upper arm bone dated to the early Pleistocene, 2.5–2.0 million years ago (Mya), was assigned to a species close to the present Merops apiaster (52). Based on molecular clock methods, speciation of Merops apiaster was estimated to have begun during the Pleistocene approximately 2 Mya when it spilt with Merops ornatus from their common ancestor (40); the extant haplotype lineages of Merops apiaster date to the middle Pleistocene, about 0.6 Mya (43). Hence, the Austrian record from the early Pleistocene (52) is probably not Merops apiaster, but possibly an ancestor of the present species. Records directly attributable to Merops apiaster from the Pleistocene have come from two sites in France, the Dordogne (53) and Corsica (54, 55), and from Israel and Russia (56). From the Holocene, following the last ice age about 11,700 years ago, a few fossil records are available from three Mediterranean sites in France: one each from the Mesolithic, early Neolithic, and Middle Ages (57). An upper arm bone from the 5th century B.C. in Egypt belongs to a bee-eater but cannot be separated from the similarly sized Madagascar Bee-eater (Merops superciliosus); the bone came from a pile of kitchen waste in a settlement (58).

Bee-eaters are depicted on wall paintings in ancient Egyptian tombs and are written in hieroglyphics, especially on medical papyri, as the ancient Egyptians believed that the bird possessed magical forces (59).

Recommended Citation

Bastian, H.-V. and A. Bastian (2024). European Bee-eater (Merops apiaster), version 3.0. In Birds of the World (S. M. Billerman and B. K. Keeney, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.eubeat1.03
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