Charadriiformes (/kəˈrædri.ɪfɔːrmiːz/, from Charadrius, the type genus of family Charadriidae) is a diverse order of small to medium-large birds. It includes about 390 species and has members in all parts of the world. Most charadriiform birds live near water and eat invertebrates or other small animals; however, some are pelagic (seabirds), others frequent deserts, and a few are found in dense forest. Members of this group can also collectively be referred to as shorebirds.
The order was formerly divided into three suborders:
The waders (or "Charadrii"): typical shorebirds, most of which feed by probing in the mud or picking items off the surface in both coastal and freshwater environments.
The gulls and their allies (or "Lari"): these are generally larger species which take fish from the sea. Several gulls and skuas will also take food items from beaches, or rob smaller species, and some have become adapted to inland environments.
The auks (or "Alcae") are coastal species which nest on sea cliffs and "fly" underwater to catch fish.
The Sibley-Ahlquist taxonomy lumps all the Charadriiformes together with other seabirds and birds of prey into a greatly enlarged order Ciconiiformes. However, the resolution of the DNA-DNA hybridization technique used by Sibley & Ahlquist was not sufficient to properly resolve the relationships in this group, and indeed it appears as if the Charadriiformes constitute a single large and very distinctive lineage of modern birds of their own.[6]
The auks, usually considered distinct because of their peculiar morphology, are more likely related to gulls, the "distinctness" being a result of adaptation for diving.[7]
Phylogeny of the Charadriiformes based a study by Heiner Kuhl and collaborators published in 2020.[4] The families and the number of species are from the list maintained by Frank Gill, Pamela Rasmussen and David Donsker on behalf of the International Ornithologists' Union.[8] The suborders are those defined by Joel Cracraft in 2013.[9]
That the Charadriiformes are an ancient group is also borne out by the fossil record. Alongside the Anseriformes, the Charadriiformes are the only other order of modern bird to have an established fossil record within the late Cretaceous, alongside the other dinosaurs.[10] Much of the Neornithes' fossil record around the Cretaceous–Paleogene extinction event is made up of bits and pieces of birds which resemble this order. In many, this is probably due to convergent evolution brought about by semiaquatic habits. Specimen VI 9901 (López de Bertodano Formation, Late CretaceousofVega Island, Antarctica) is probably a basal charadriiform somewhat reminiscent of a thick-knee.[11] However, more complete remains of undisputed charadriiforms are known only from the mid-Paleogene onwards. Present-day orders emerged around the Eocene-Oligocene boundary, roughly 35-30 mya. Basal or unresolved charadriiforms are:
"Larus" desnoyersii (Early Miocene of SE France) - larid? stercorarid?
"Larus" pristinus (John Day Early Miocene of Willow Creek, US) - larid?
Charadriiformes gen. et sp. indet. (Bathans Early/Middle Miocene of Otago, New Zealand) - charadriid? scolopacid?[12]
Charadriiformes gen. et sp. indet. (Bathans Early/Middle Miocene of Otago, New Zealand) - charadriid? scolopacid?[13]
Charadriiformes gen. et sp. indet. (Bathans Early/Middle Miocene of Otago, New Zealand) - larid?[14]
Charadriiformes gen. et sp. indet. (Sajóvölgyi Middle Miocene of Mátraszõlõs, Hungary[15]
"Totanus" teruelensis (Late Miocene of Los Mansuetos, Spain) - scolopacid? larid?
The "transitional shorebirds" ("Graculavidae") are a generally Mesozoicform taxon formerly believed to constitute the common ancestors of charadriiforms, waterfowl and flamingos. They are now assumed to be mostly basal taxa of the charadriiforms and/or "higher waterbirds", which probably were two distinct lineages 65 mya already,[16] and few if any are still believed to be related to the well-distinct waterfowl. Taxa formerly considered graculavids are:
Neornithes incerta sedis (Late Paleocene/Early Eocene of Ouled Abdoun Basin, Morocco)[17]
Fluviatitavis (Early Eocene of Silveirinha, Portugal)
Evolution of parental care in Charadriiformes[edit]
Shorebirds pursue a larger diversity of parental care strategies than do most other avian orders. They therefore present an attractive set of examples to support the understanding of the evolution of parental care in avians generally.[18] The ancestral avian most likely had a female parental care system.[19] The shorebird ancestor specifically evolved from a bi-parental care system, yet the species within the clade Scolopacidae evolved from a male parental care system. These transitions might have occurred for several reasons. Brooding density is correlated with male parental care. Male care systems in birds are shown to have a very low breeding density while female care systems in birds have a high breeding density. (Owens 2005). Certain rates of male and female mortality, male and female egg maturation rate, and egg death rate have been associated with particular systems as well.[20] It has also been shown that sex role reversal is motivated by the male-biased adult sex ratio.[21] The reason for such diversity in shorebirds, compared to other birds, has yet to be understood.
^Mayr, Gerald (2016). Avian evolution: the fossil record of birds and its paleobiological significance. Topics in Paleobiology. Wiley-Blackwell. p. 306. ISBN978-1-119-02076-9.
^Černý, David; Natale, Rossy (2021-07-16). "Comprehensive taxon sampling and vetted fossils help clarify the time tree of shorebirds (Aves, Charadriiformes)". bioRxiv10.1101/2021.07.15.452585.
^ abCracraft, Joel (2013). Dickinson, E.C.; Remsen, J.V. Jr. (eds.). The Howard & Moore Complete Checklist of the Birds of the World. Vol. 1: Non-passerines (4th ed.). Eastbourne, UK: Aves Press. pp. xxxvii–xxxviii. ISBN978-0-9568611-0-8.
^Several wing and thorax bones of a bird the size of a double-banded plover: Worthy et al. (2007)
^Premaxillae (MNZ S42681, S42736) and proximal right scapula (MNZ S41058) of a bird apparently similar to the black-billed gull but almost the size of a kelp gull: Worthy et al. (2007)
^A wading bird the size of a white stork (Ciconia ciconia): Bourdon (2005)
^Thomas, Gavin H.; Székely, Tamás; Reynolds, John D. (2007). "Sexual Conflict and the Evolution of Breeding Systems in Shorebirds". Advances in the Study of Behavior. Vol. 37. Elsevier. pp. 279–342. doi:10.1016/s0065-3454(07)37006-x. ISBN9780120045372. ISSN0065-3454.
^Tullberg, B. S., M. Ah–King and H. Temrin. 2002. Phylogenetic reconstruction of parental–care systems in the ancestors of birds. Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences. 357: 251–257.
^Klug, H., M. B. Bonsall, and S.H Alonzo. 2013. Sex differences in life history drive evolutionary transitions among maternal, paternal, and bi‐parental care. Ecology and Evolution. 3: 792–806.
^Liker, A., R. P. Freckleton, and T. Székely. 2013. The evolution of sex roles in birds is related to adult sex ratio. Nature Communications. 4: 1587.
Bourdon, Estelle (2006): L'avifaune du Paléogène des phosphates du Maroc et du Togo: diversité, systématique et apports à la connaissance de la diversification des oiseaux modernes (Neornithes) ["Paleogene avifauna of phosphates of Morocco and Togo: diversity, systematics and contributions to the knowledge of the diversification of the Neornithes"]. Doctoral thesis, Muséum national d'histoire naturelle [in French]. HTML abstract
Ericson, Per G.P.; Envall, I.; Irestedt, M. & Norman, J.A. (2003): Inter-familial relationships of the shorebirds (Aves: Charadriiformes) based on nuclear DNA sequence data. BMC Evol. Biol.3: 16. doi:10.1186/1471-2148-3-16PDF fulltext
Gál, Erika; Hír, János; Kessler, Eugén & Kókay, József (1998–99): Középsõ-miocén õsmaradványok, a Mátraszõlõs, Rákóczi-kápolna alatti útbevágásból. I. A Mátraszõlõs 1. lelõhely [Middle Miocene fossils from the sections at the Rákóczi chapel at Mátraszőlős. Locality Mátraszõlõs I.]. Folia Historico Naturalia Musei Matraensis23: 33–78. [Hungarian with English abstract] PDF fulltext
Klug, H., M. B. Bonsall, and S.H Alonzo. 2013. Sex differences in life history drive evolutionary transitions among maternal, paternal, and bi‐parental care. Ecology and Evolution. 3: 792–806.
Liker, A., R. P. Freckleton, and T. Székely. 2013. The evolution of sex roles in birds is related to adult sex ratio. Nature Communications. 4: 1587.
Owens, I.P. 2002. Male–only care and classical polyandry in birds: phylogeny, ecology and sex differences in remating opportunities. Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences. 357: 283–293.
Paton, Tara A. & Baker, Allan J. (2006): Sequences from 14 mitochondrial genes provide a well-supported phylogeny of the Charadriiform birds congruent with the nuclear RAG-1 tree. Mol. Phylogenet. Evol.39(3): 657–667. doi:10.1016/j.ympev.2006.01.011PMID16531074 (HTML abstract)
Székely, T and J.D. Reynolds. 1995. Evolutionary transitions in parental care in shorebirds. Proceedings of the Royal Society of London. Series B: Biological Sciences. 262: 57–64.
Thomas, Gavin H.; Székely, Tamás; Reynolds, John D. (2007). "Sexual Conflict and the Evolution of Breeding Systems in Shorebirds". Advances in the Study of Behavior. Vol. 37. Elsevier. pp. 279–342. doi:10.1016/s0065-3454(07)37006-x. ISBN9780120045372. ISSN0065-3454.
Thomas, Gavin H.; Wills, Matthew A. & Székely, Tamás (2004a): Phylogeny of shorebirds, gulls, and alcids (Aves: Charadrii) from the cytochrome-b gene: parsimony, Bayesian inference, minimum evolution, and quartet puzzling. Mol. Phylogenet. Evol.30(3): 516–526. doi:10.1016/S1055-7903(03)00222-7 (HTML abstract)
Tullberg, B. S., M. Ah–King and H. Temrin. 2002. Phylogenetic reconstruction of parental–care systems in the ancestors of birds. Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences. 357: 251–257.
van Tuinen, Marcel; Waterhouse, David & Dyke, Gareth J. (2004): Avian molecular systematics on the rebound: a fresh look at modern shorebird phylogenetic relationships. J. Avian Biol.35(3): 191–194. doi:10.1111/j.0908-8857.2004.03362.xPDF fulltext
