Anas fulvigula (http://www.birdphotos.com)
Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Archosauromorpha
Cladus: Crurotarsi
Divisio: Archosauria
Cladus: Avemetatarsalia
Cladus: Ornithodira
Subtaxon: Dinosauromorpha
Cladus: Dinosauriformes
Cladus: Dracohors
Cladus: Dinosauria
Ordo: Saurischia
Cladus: Eusaurischia
Subordo: Theropoda
Cladus: Neotheropoda
Cladus: Averostra
Cladus: Tetanurae
Cladus: Avetheropoda
Cladus: Coelurosauria
Cladus: Tyrannoraptora
Cladus: Maniraptoromorpha
Cladus: Maniraptoriformes
Cladus: Maniraptora
Cladus: Pennaraptora
Cladus: Paraves
Cladus: Eumaniraptora
Cladus: Avialae
Infraclassis: Aves
Cladus: Euavialae
Cladus: Avebrevicauda
Cladus: Pygostylia
Cladus: Ornithothoraces
Cladus: Ornithuromorpha
Cladus: Carinatae
Parvclassis: Neornithes
Cohors: Neognathae
Cladus: Pangalloanserae
Cladus: Galloanseres
Ordo: Anseriformes
Familia: Anatidae
Genus: Anas
Species: Anas fulvigula
Name
Anas fulvigula Ridgway, 1874
References
Am.Nat. 8 no.2 p.111
Vernacular names
dansk: Floridagråand
Deutsch: Floridaente, Stockente-fulvigula
English: Mottled Duck, Florida duck
español: Ánade Jaspeado
eesti: Rand-sinikaelpart
suomi: Suolakkosorsa
français: Canard brun
magyar: Floridai réce
italiano: Germano maculato
日本語: マダラガモ, madaragamo
Nederlands: Gevlekte Eend
norsk: Golfand
polski: Krzyzówka florydzka
português: Pato-da-flórida
русский: Флоридский чирок
slovenčina: Kačica pobrežná
svenska: Fläckand
中文: 北美斑鸭
The mottled duck (Anas fulvigula)[note 1] or mottled mallard is a medium-sized species of dabbling duck. It is intermediate in appearance between the female mallard and the American black duck. It is closely related to those species, and is sometimes erroneously considered a subspecies of the former.
Along the Gulf of Mexico coast, the mottled duck is one of the most frequently banded waterfowl. This is due in part to the fact that it is mostly non-migratory. Approximately one out of every 20 mottled ducks is banded, making it an extremely prized and sought after bird among hunters.
Subspecies
There are two distinct subspecies of the mottled duck. One subspecies, the Gulf Coast mottled duck (A. f. maculosa), lives on the Gulf of Mexico coast between Alabama and Tamaulipas (Mexico); outside the breeding season, individual birds may venture as far south as Veracruz. The other, the Florida mottled duck (A. f. fulvigula), is resident in central and southern Florida and occasionally strays north to Georgia. The same disjunct distribution pattern was also historically found in the local sandhill cranes. Individuals of both subspecies were introduced into South Carolina in the 1970s and 1980s, where the birds of mixed ancestry have greatly expanded in range, extending through the Atlantic coastal plain of Georgia into northeastern Florida.[3][4]
Description
In Florida, U.S.
The adult mottled duck is 44 to 61 cm (17–24 in) long from head to tail. It has a dark body, lighter head and neck, orange legs and dark eyes. Both sexes have a shiny green-blue speculum (wing patch), which is not bordered with white as with the mallard. Males and females are similar, but the male's bill is bright yellow, whereas the female's is deep to pale orange, occasionally lined with black splotches around the edges and near the base.
The plumage is darker than in female mallards, especially at the tail, and the bill is yellower. In flight, the lack of a white border to the speculum is a key difference. The American black duck is darker than most mottled ducks, and its wing-patch is more purple than blue. The behaviour and voice are the same as the mallard.
Mottled ducks feed by dabbling in shallow water, and grazing on land. They mainly eat plants, but also some mollusks and aquatic insects. The ducks are fairly common within their restricted range; they are resident all-year round and do not migrate. The breeding habitat is coastal marshes. The nest is built on the ground amongst vegetation, such as bull-rush and marsh grass.
Measurements:[5]
Male:
Length: 19.7–22.5 in (50–57 cm)
Weight: 30.9–43.8 oz (880–1,240 g)
Wingspan: 32.7–34.3 in (83–87 cm)
Female:
Length: 18.5–21.0 in (47–53 cm)
Weight: 24.7–40.6 oz (700–1,150 g)
Wingspan: 31.5–327.2 in (80–831 cm)
Systematics
The Floridian population, which occurs approximately south of Tampa, is separated as the nominate subspecies Anas fulvigula fulvigula and is occasionally called the Florida mottled duck or Florida mallard. It differs from the other subspecies, the Gulf Coast mottled duck (A. f. maculosa) (etymology: maculosa, Latin for "the mottled one"), by being somewhat lighter in color and less heavily marked; while both subspecies are intermediate between female mallards and American black ducks, the Florida mottled duck is closer to the former and the Gulf Coast mottled duck closer to the latter in appearance; this is mainly recognizable in the lighter head being quite clearly separated from the darker breast in Gulf Coast mottled ducks, but much less so in Florida mottled ducks. As the subspecies' ranges do not overlap, these birds can only be confused with female mallards and American black ducks however; particularly female American black ducks are often only reliably separable by their dark purple speculum from mottled ducks in the field.
mtDNA control region sequence data indicates that these birds are derived from ancestral American black ducks, being far more distantly related to the mallard, and that the two subspecies, as a consequence of their rather limited range and sedentary habits, are genetically well distinct already.[6]
The Florida mottled duck (A. f. fulvigula)
As in all members of the "mallardine" clade of ducks, they are able to produce fertile hybrids with their close relatives, the American black duck and the mallard. This has always been so to a limited extent; individuals of the migratory American black ducks which winter in the mottled duck's range may occasionally stay there and mate with the resident species, and for the mallard, which colonized North America later, the same holds true.[6] Genetic tools have been developed in order to robustly classify hybrids and to assess and monitor the genetic dynamics of introgression between the Florida mottled duck and the mallard.[7]
While the resultant gene flow is no cause for immediate concern,[note 2] habitat destruction and excessive hunting could eventually reduce this species to the point where the hybridization with mallards would threaten to make it disappear as a distinct taxon.[8] This especially applies to the Florida mottled duck,[9] in the fairly small range of which rampant habitat destruction due to urbanization and draining of wetlands has taken place in the last decades; this, in combination with climate change affecting the Everglades, could be sufficient to cause the Florida mottled duck to decline to a point where hunting would have to be restricted or prohibited.[6] At present, these birds too appear to be holding their own, with a population of 50,000-70,000 individuals. While hybridization is common, double white bars above and below the speculum are not a sufficient indicator of hybridization and therefore should not be used to determine genetics.[1]
Footnotes
Etymology: Anas, Ancient Greek for a duck. fulvigula, "tan-throated", from Latin fulva "tan" + gula, "throat".
Except in a scientific sense, as it requires large sample sizes to appropriately study these ducks' phylogeny using mtDNA sequence data, which only documents a bird's evolutionary history on the maternal side.
References
BirdLife International (2016). "Anas fulvigula". IUCN Red List of Threatened Species. 2016: e.T22680178A95209889. doi:10.2305/IUCN.UK.2016-3.RLTS.T22680178A95209889.en. Retrieved 12 November 2021.
"NatureServe Explorer 2.0". explorer.natureserve.org. Retrieved 27 May 2022.
Bielefeld; et al. (4 March 2020). "Mottled Duck". Birds of the World. Cornell Lab of Ornithology. doi:10.2173/bow.motduc.01. S2CID 216430094. Retrieved 26 September 2020.
eBird. Cornell Lab of Ornithology https://ebird.org/map/motduc?neg=true&env.minX=-130.7953337827774&env.minY=35.894543807307656&env.maxX=-74.5453337827774&env.maxY=55.15764076883122&zh=true&gp=true&ev=Z&mr=1-12&bmo=1&emo=12&yr=all&byr=1900&eyr=2020. Retrieved 26 September 2020. "Mottled Duck Identification, All About Birds, Cornell Lab of Ornithology". www.allaboutbirds.org. Retrieved 2020-09-26.
McCracken, Kevin G.; Johnson, William P.; Sheldon, Frederick H. (2001). "Molecular population genetics, phylogeography, and conservation biology of the mottled duck (Anas fulvigula)" (PDF). Conservation Genetics. 2 (2): 87–102. doi:10.1023/A:1011858312115. S2CID 17895466. Archived from the original (PDF) on 2006-09-07.
Seyoum, S; Tringali, MD; Bielefeld, RR; Feddersen, JC; Benedict Jr, RJ; Fanning, AT; Barthel, B; Curtis, C; Puchulutegui, C; Roberts, ACM; Villanova Jr, VL; Tucker, EC (2012). "Fifty-nine microsatellite markers for hybrid classification studies involving endemic Florida Mottled Duck (Anas fulvigula fulvigula) and invasive Mallards (A. platyrhynchos)". Conservation Genetics Resources. 4 (3): 681–687. doi:10.1007/s12686-012-9622-9. S2CID 16072813.
Rhymer, Judith M.; Simberloff, Daniel (1996). "Extinction by hybridization and introgression". Annual Review of Ecology, Evolution, and Systematics. 27: 83–109. doi:10.1146/annurev.ecolsys.27.1.83.
Mazourek, J.C.; Gray, P.N. (1994). "The Florida duck or the mallard?". Florida Wildlife. 48 (3): 29–31. Archived from the original on 2007-08-10. Retrieved 2006-12-14.
Madge, Steve; Burn, Hilary (1987). Wildfowl : an identification guide to the ducks, geese and swans of the world. London: Christopher Helm. ISBN 0-7470-2201-1.
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