Northern Yellow Warbler (Setophaga aestiva)

Northern yellow warbler
Male, New York, New York
Conservation status
Least Concern (IUCN 3.1)[1]
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Passeriformes
Family:	Parulidae
Genus:	Setophaga
Species:	S. aestiva
Binomial name
Setophaga aestiva (Gmelin, JF, 1789)
Distribution of the yellow warbler   Breeding range   Year-round range   Wintering range
Synonyms
Motacilla aestiva (protonym)

The northern yellow warbler (Setophaga aestiva), also known as the American yellow warbler, is a New World warbler. It is a widespread migratory species in the diverse genus Setophaga, that breeds in most parts of North America. It was formerly considered to be conspecific with the non-migratory mangrove yellow warbler (Setophaga petechia).

The northern yellow warbler was formally described in 1789 by the German naturalist Johann Friedrich Gmelin in his revised and expanded edition of Carl Linnaeus's Systema Naturae. He mainly based his account on a hand-coloured engraving of the "Figuier de Canada" by François-Nicolas Martinet. Gmelin placed the warbler in the genus Motacilla and coined the binomial name Motacilla aestiva.^[2][3][4] In 1957 the type locality was restricted to Quebec in Canada.^[5] The specific epithet aestiva is from Latin aestivus meaning "summery", from aestas, aestatis meaning "summer".^[6]The northern yellow warbler is now one of the 35 species in the genus Setophaga.^[7] The genus name Setophaga combines the Ancient Greek σης/sēs, σητος/sētos meaning "moth" with -φαγος/-phagos meaning "-eating".^[8]

The northern yellow warbler was formerly considered to be conspecific with the mangrove yellow warbler (Setophaga petechia). The two species were split based on differences in mitochondrial DNA sequences,^{[9][10][11][12]} as well as differences in the plumage and vocalization.^[7]

Nine subspecies are recognised:^[7]

• S. a. rubiginosa (Pallas, PS, 1811) – breeds southern Alaska to western British Columbia; winters to southern Baja and Panama
• S. a. banksi (Browning, MR, 1994) – breeds central Alaska and northwestern Canada
• S. a. parkesi (Browning, MR, 1994) – breeds northern Alaska and northern Canada
• S. a. amnicola (Batchelder, CF, 1918) – breeds Alaska, Canada, and Newfoundland; winters to northern South America
• S. a. aestiva (Gmelin, JF, 1789) – breeds south-central Canada and central USA; winters to South America
• S. a. morcomi (Coale, HK, 1887) – breeds southeastern British Columbia, western USA, and northern Baja California; winters to northern South America
• S. a. brewsteri (Grinnell, J, 1903) – breeds coastal western USA and northwestern Mexico
• S. a. sonorana (Brewster, W, 1888) – breeds southwestern USA to northwestern Mexico; winters to western Panama, Colombia, and Ecuador
• S. a. dugesi (Coale, HK, 1887) – Central Plateau of Mexico

Other than in male breeding plumage and body size, all warbler subspecies are very similar. Winter, female and immature birds all have similarly greenish-yellow uppersides and are a duller yellow below. Young males soon acquire breast and, where appropriate, head coloration. Females are somewhat duller, most notably on the head. In all, the remiges and rectrices are blackish olive with yellow edges, sometimes appearing as an indistinct wing-band on the former. The eyes and the short thin beak are dark, while the feet are lighter or darker olive-buff.^[13][14]

The 35 subspecies of S. petechia can be divided into three main groups according to the males' head color in the breeding season.^[14] Each of these groups is sometimes considered a separate species, or the aestiva group (yellow warbler) is considered a species different from S. petechia (mangrove warbler, including golden warbler); the latter option is the one currently accepted by the International Ornithological Congress World Bird List.^[15]

Depending on subspecies, the northern yellow warbler may be between 10 and 18 cm (3.9 and 7.1 in) long, with a wingspan from 16 to 22 cm (6.3 to 8.7 in). They weigh 7–25 g (0.25–0.88 oz), varying between subspecies and whether on migration or not, globally averaging about 16 g (0.56 oz) but only 9–10 g (0.32–0.35 oz) in most breeding adults of the United States populations. Among standard measurements throughout the subspecies, the wing chord is 5.5 to 7 cm (2.2 to 2.8 in), the tail is 3.9 to 5.6 cm (1.5 to 2.2 in), the bill is 0.8 to 1.3 cm (0.31 to 0.51 in) and the tarsus is 1.7 to 2.2 cm (0.67 to 0.87 in).^[14] The summer males of this species are generally the yellowest warblers wherever they occur. They are brilliant yellow below and greenish-golden above. There are usually a few wide, somewhat washed-out rusty-red streaks on the breast and flanks. These markings are the reason for the scientific name petechia, which roughly translates to "liver spotted".^[16] The subspecies in this group mostly vary in brightness and size according to Bergmann's and Gloger's Rule.^[17]

Yellow warbler (aestiva group) song

Recorded in Prince Edward Point National Wildlife Area, Ontario, Canada

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The song is a musical strophe that can be rendered sweet sweet sweet, I'm so sweet, although it varies considerably between populations. The call is a soft or harder chip or ship. This is particularly frequently given by females after a male has finished his song. In territorial defense, they give hissing calls, while seet seems to be a kind of specialized cowbird alert (see below). Other calls are given in communication between pair-members, neighbors, or by young begging for food. These birds also communicate with postures and perhaps with touch.^[13]

Northern yellow warblers breed in most of North America from the tundra southwards, except for the far Southwest and the Gulf of Mexico coast.^[13] Northern yellow warblers winter to the south of their breeding range, from southern California to the Amazon region, Bolivia and Peru.^[13] The mangrove and golden warblers occur to the south of it, to the northern reaches of the Andes.

Northern yellow warblers arrive in their breeding range in late spring – generally about April/May – and move to winter quarters again starting as early as July, as soon as the young are fledged. Most, however, stay a bit longer; by the end of August, the bulk of the northern populations has moved south, though some may linger almost until fall. At least in northern Ohio, yellow warblers do not linger, leaving as they did 100 years ago.^[18]

The breeding habitat of Northern yellow warblers is typically riparian or otherwise moist land with ample growth of small trees, in particular willows (Salix). The other groups, as well as wintering birds, chiefly inhabit mangrove swamps and similar dense woody growth. Less preferred habitats are shrubland, farmlands and forest edges. In particular northern yellow warblers will come to suburban or less densely settled areas, orchards and parks, and may well breed there. Outside the breeding season, these warblers are usually encountered in small groups, but while breeding they are fiercely territorial and will try to chase away any conspecific intruder that comes along.^[13]

Roughly 60% of their diet is caterpillars. They also consume wasps,^[19] mayflies, moths, mosquitoes, beetles, damselflies, treehoppers, other insects,^[20] insect larvae, and spiders.^[21] They acquire prey by gleaning in shrubs and on tree branches, and by hawking prey that tries to fly away. Other invertebrates and some berries and similar small juicy fruits^[22] are also eaten, the latter especially by northern yellow warblers in their winter quarters. The yellow warbler is one of several insectivorous bird species that reduce the number of coffee berry borer beetles in Costa Rica coffee plantations by 50%. Caterpillars are the staple food for nestlings, with some – e.g. those of geometer moths (Geometridae) – preferred over others.^[23]

The predators of yellow and mangrove warblers are those typical of such smallish tree-nesting passerines, such as snakes, foxes, birds of prey, and many others. The odds of an adult northern yellow warbler surviving from one year to the next are on average 50%; in the southern populations, by contrast, about two-thirds of the adults survive each year. Conversely, less than one northern yellow warbler nest in three on average suffers from predation in one way or another, while two out of three mangrove and golden warbler nests are affected.^[24]

Snakes, including the blue racer (Coluber constrictor foxii) and common garter snake (Thamnophis sirtalis),^[25] are significant nest predators, taking nestlings and fledglings as well as sick or distracted adults. Likewise, corvids such as the American crow (Corvus brachyrhynchos) and blue jay (Cyanocitta cristata),^[26] and large climbing rodents, notably the American red squirrel (Tamiasciurus hudsonicus) also attack nests in this manner.^[26] Carnivores (in particular members of the Musteloidea) including the striped skunk (Mephitis mephitis), long-tailed weasel (Neogale frenata), common raccoon (Procyon lotor),^[13] red fox (Vulpes vulpes), and domestic or feral cats, are similarly opportunistic predators. All these pose little threat to the nimble, non-nesting adults, which are taken by certain smallish and agile birds such as the American kestrel (Falco sparverius) and Cooper's hawk (Accipiter cooperii), and the sharp-shinned hawk (A. striatus). Other avian predators of adults have included peregrine falcons (Falco peregrinus) and merlins (F. columbarius). Owls such as great horned owls (Bubo virginianus) and eastern screech owls (Megascops asio) have been known to assault yellow warblers of all ages at night.^[13][27]

These New World warblers seem to mob predators only rarely. An exception are cowbirds, which are significant brood parasites. The yellow warbler is a regular host of the brown-headed cowbird (Molothrus ater), with about 40% of all nests suffering attempted or successful parasitism. By contrast, the tropical populations are less frequent hosts to the shiny cowbird (M. bonariensis), with only 10% of nests affected. This may be due to the slightly larger size of shiny cowbirds, which are less likely to survive being fed by the much smaller warbler, compared to brown-headed cowbirds.^[27] The yellow warbler is one of the few passerine proven to be able to recognize the presence of cowbird eggs in its nest.^[27] Upon recognizing one the warbler will often smother it with a new layer of nesting material. It will usually not try to save any of its own eggs that have already been laid, but produce a replacement clutch. Sometimes, the parents desert a parasitized nest altogether and build a new one. Unlike some cuckoos, cowbird nestlings will not actively kill the nestlings of the host bird; mixed broods of Setophaga and Molothrus may fledge successfully.^[24] However, success of fledging in yellow warbler nests is usually decreased by the parasitism of cowbirds due to the pressures of raising a much larger bird.^[27]

Other than predation, causes of mortality are not well known. The maximum recorded ages^[28] of wild yellow warblers are around 10 years. A wintering northern yellow warbler examined near Turbo, Colombia was not infected with blood parasites, unlike other species in the study. It is unclear whether this significant, but wintering birds in that region generally lacked such parasites.^[29]

As usual for members of the Parulidae, yellow warblers nest in trees, building a small but very sturdy cup nest. Females and males rear the young about equally, but emphasize different tasks: females are more involved with building and maintaining the nest, and incubating and brooding the offspring. Males are more involved in guarding the nest site and procuring food, bringing it to the nest and passing it to the waiting mother, which does most of the actual feeding. As the young approach fledging, the male's workload becomes proportionally higher.^[13]

The northern yellow and mangrove (including golden) warblers differ in some other reproductive parameters. While the former is somewhat more of an r-strategist, the actual differences are complex and adapted to different environmental conditions. The yellow warbler starts breeding in May/June, while the mangrove warbler breeds all year round. Northern yellow warblers have been known to raise a brood of young in as little as 45 days, with 75 the norm. Tropical populations, by contrast, need more than 100 days per breeding. Males court the females with songs, singing 3,200 or more per day. They are, like most songbirds, generally serially monogamous; some 10% of mangrove warbler and about half as many northern yellow warbler males are bigamous. Very few if any northern yellow warblers breed more than once per year, with just 5% of female mangrove warblers doing so. If a breeding attempt fails, either parent will usually try to raise a second brood.^[24]

The clutch of the northern yellow warbler is 3–6 (typically 4–5, rarely 1–2) eggs. Incubation usually takes 11 days, sometimes up to 14. The nestlings weigh 1.3 g (0.046 oz) on average, are brooded for an average 8–9 days after hatching, and leave the nest the following day or the one thereafter. The mangrove warbler has only 3 eggs per clutch on average and incubates some 2 days longer. Its average post-hatching brooding time is 11 days. Almost half of the parents (moreso in the mangrove warbler than the northern yellow warbler) attend the fledglings for two weeks or more after these leave the nest. Sometimes the adults separate early, each accompanied by one to three of the young.^[30]

Some 3–4 weeks after hatching, the young are fully independent of their parents. They become sexually mature at one year of age, and attempt to breed right away. Some 55% of all northern yellow warbler nestings are successful in raising at least one young.^[30] In contrast, only 25% of mangrove warbler nests successfully fledge any offspring, with accidents and predation frequently causing total loss of the clutch.

• 
  Yellow warbler nest with small clutch
• Male feeds another warbler

Yellow warblers, in particular the young, devour many pest insects during the breeding season. The plumage and song of the breeding males have been described^[13] as "lovely" and "musical". No significant negative effects of northern yellow and mangrove warblers on humans have been recorded.^[13]

Being generally common and occurring over a wide range, the northern yellow warbler is not considered a threatened species by the IUCN.^[31] Some local decline in numbers has been found in areas, mainly due to habitat destruction and pollution. The chief causes are land clearance, the agricultural overuse of and herbicide and pesticide, and sometimes overgrazing. However, stocks will usually rebound quickly if riparian habitat is allowed to recover, particularly among the prolific northern yellow warbler.^[1][13]

The North American populations are legally protected by the Migratory Bird Treaty Act. The Barbados golden warbler^[32] (D. p. petechia) has been listed as "endangered foreign wildlife" by the United States' Endangered Species Act (ESA) since 1970; other than for specially permitted scientific, educational or conservation purposes, importing it into the US is illegal. The Californian yellow warbler (D. p./a. brewsteri) and Sonoran yellow warbler (D.p./a. sonorana) are listed as "species of concern" by the ESA.^[33]

Wikimedia Commons has media related to Setophaga petechia.

Wikispecies has information related to Setophaga petechia.

• Mangrove warbler breeding ecology
• Yellow warbler species account; Archived 2009-03-27 at the Wayback Machine – Cornell Lab of Ornithology
• Yellow warbler – Dendroia petechia; Archived 2007-11-01 at the Wayback Machine – USGS Patuxent Bird Identification InfoCenter
• Grizzlyrun.com Yellow warbler general information and photos
• Stamps at bird-stamps.org
• "Yellow warbler media". Internet Bird Collection.
• Yellow warbler photo gallery at VIREO (Drexel University)