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African jacana
African jacana
African jacana
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African jacana
Okavango delta, Botswana
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Charadriiformes
Family: Jacanidae
Genus: Actophilornis
Species:
A. africanus
Binomial name
Actophilornis africanus
(Gmelin, JF, 1789)

The African jacana (Actophilornis africanus) is a wader in the family Jacanidae. It has long toes and long claws that enables it to walk on floating vegetation in shallow lakes, its preferred habitat. It is widely distributed in sub-Saharan Africa. For the origin and pronunciation of the name, see Jacanidae.

Taxonomy

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The African jacanas 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 placed it in the genus Parra and coined the binomial name Parra africana.[2] Gmelin based his description on that by the English ornithologist John Latham who in 1785 had described and illustrated the species in his A General Synopsis of Birds.[3] Gmelin and Latham gave the locality as "Africa": this was restricted to Ethiopia in 1915.[4][5] The African jacana is now placed in the genus Actophilornis that was introduced in 1925 by the American ornithologist Harry C. Oberholser.[6][7] The genus name combines the Ancient Greek aktē meaning "river bank" or "coastal strand", -philos meaning "-loving" and ornis meaning "bird".[8] The species is considered to be monotypic: no subspecies are recognised.[7]

Description

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The African jacanas is a conspicuous and unmistakable bird. It measures 23 to 31 cm (9.1 to 12.2 in) in overall length. As in other jacanas, the female is on average larger than the male. Males can weigh from 115 to 224 g (4.1 to 7.9 oz), averaging 137 g (4.8 oz) and females from 167 to 290 g (5.9 to 10.2 oz), averaging 261 g (9.2 oz). Alongside the similarly-sized Madagascar jacana, this appears to be the heaviest jacana species.[9][10] They have chestnut upperparts with black wingtips, rear neck, and eyestripe. The underparts are also chestnut in the adults, only in juveniles they are white with a chestnut belly patch. The blue bill extends up as a coot-like head shield, and the legs and long toes are grey.

Behaviour

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Food and feeding

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African jacanas feed on insects and other invertebrates picked from the floating vegetations or the surface of the water.[11]

Breeding

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African jacanas breed throughout sub-Saharan Africa. It is sedentary apart from seasonal dispersion. It lays four black-marked brown eggs in a floating nest.

The jacana has evolved a highly unusually polyandrous mating system, meaning that one female mates with multiple males and the male alone cares for the chicks. Such a system has evolved due to a combination of two factors: firstly, the lakes that the jacana lives on are so resource-rich that the relative energy expended by the female in producing each egg is effectively negligible. Secondly the jacana, as a bird, lays eggs, and eggs can be equally well incubated and cared for by a parent bird of either sex. This means that the rate-limiting factor of the jacana's breeding is the rate at which the males can raise and care for the chicks. Such a system of females forming harems of males is in direct contrast to the more usual system of leks seen in animals such as stags and grouse, where the males compete and display in order to gain harems of females.

The parent that forms part of the harem is almost always the one that ends up caring for the offspring; in this case, each male jacana incubates and rears a nest of chicks. The male African jacana has therefore evolved some remarkable adaptations for parental care, such as the ability to pick up and carry chicks underneath its wings.[12][13]

References

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Revisions and contributorsEdit on WikipediaRead on Wikipedia

African jacana

View on Grokipedia
from Grokipedia
The African jacana (Actophilornis africanus) is a distinctive tropical in the family , characterized by its elongated toes and claws that enable it to walk delicately across floating aquatic vegetation, earning it the nickname "lily-trotter." This medium-sized bird measures 23–31 cm in length, with females significantly larger and heavier (up to 260 g) than males (around 137 g), and features a striking plumage of rich upperparts, a black crown and , a white foreneck, and a golden-yellow breast, complemented by a pale blue bill and facial shield. Immatures differ with paler brown upperparts, white underparts, and a less vivid bill. Native to , the African jacana is widely distributed across an extent of occurrence spanning 24,400,000 km², from and to , inhabiting shallow freshwater wetlands such as marshes, lakes, and slow-flowing rivers with abundant floating vegetation like water lilies, typically at elevations from 0 to 3,000 m. It avoids dense forests and arid zones, favoring permanent or seasonally flooded areas where it forages for , mollusks, seeds, and small crustaceans by picking from lily pads or probing the water surface. The species is largely sedentary but exhibits nomadic tendencies outside the breeding season, sometimes forming large flocks, and is known for its weak flight with dangling legs, as well as vocalizations including sharp "krrrek" calls and honking "kyaaan" notes in flight. A hallmark of the African jacana's ecology is its polyandrous , where females maintain harems of several males, laying up to four clutches of four pale brown, black-marked eggs per season in floating nests constructed from vegetation, while males alone incubate the eggs for 20–26 days and provide all to the precocial chicks for 40–70 days. Breeding occurs year-round in suitable climates but is seasonal in drier regions, with a global population estimated at 667,000 mature individuals showing a trend. Although currently classified as Least Concern by the IUCN due to its wide range, the species faces threats from degradation through drainage, , and , underscoring the importance of .

Taxonomy

History and classification

The African jacana was formally described in 1789 by the German naturalist Johann Friedrich Gmelin as Parra africana in the 13th edition of Carl Linnaeus's Systema Naturae. The initial type locality was vaguely designated as "Africa." In 1915, British ornithologist C. H. B. Grant restricted the type locality to Ethiopia based on examination of relevant specimens. Following its original description, the species underwent several taxonomic reclassifications. Originally placed in the genus Parra, it was later moved due to nomenclatural issues. In 1925, American ornithologist Harry C. Oberholser introduced the genus Actophilornis to accommodate it, replacing the preoccupied name Actophilus (originally proposed by Oberholser in 1899). The accepted binomial name is now Actophilornis africanus. The African jacana belongs to the family within the order , a diverse assemblage of waders, plovers, and related birds; jacanas are distinguished as "lily-trotters" for their adaptations to aquatic vegetation. It is treated as a monotypic , with no formally recognized , despite observations of minor plumage variations in different populations.

Subspecies status

The African jacana (Actophilornis africanus) is recognized as a monotypic , with no formally described , due to the consistent morphology observed across its extensive range in . This uniformity in , size, and other traits supports its classification without subspecific divisions, as detailed in authoritative ornithological assessments. In contrast, related species like the (Jacana spinosa) exhibit more pronounced geographic variation, leading to the formal description of subspecies such as J. s. gymnostoma.

Description

Morphology

The African jacana (Actophilornis africanus) is a medium-sized measuring 23–31 cm in body length, with a of approximately 50–60 cm. Males weigh 115–224 g on average (137 g), while females are heavier at 167–290 g on average (261 g), reflecting the ' sexual size dimorphism. Key structural adaptations include elongated toes and claws, up to 5–6 cm long, which enable across a broad surface area; long legs suited for wading; a short ; and a relatively long neck that contributes to its upright posture. is straight and blue, reaching up to 5 cm in length, and is continuous with a prominent frontal shield that extends over the forehead, both colored pale blue to gray-blue. is generally chestnut above with black on the crown and hindneck, white on the sides of the face, chin, and throat, though specific color variations are addressed in discussions of .

Sexual dimorphism

The African jacana exhibits pronounced reversed sexual size dimorphism, with females considerably larger than males, attaining a female-to-male mass ratio of approximately 1.68:1. This size difference facilitates female dominance in the species' polyandrous mating system, where females aggressively compete intrasexually for territories and access to multiple male mates. Adult plumage is similar between the sexes and highly distinctive, featuring bright upperparts, black flight feathers, white underparts with a golden-yellow foreneck and breast and flanks, and a blue bill continuous with a fleshy frontal . Juvenile plumage differs markedly from that of , with a brown head lacking the blue bill and , mottled brown upperparts with buff fringes, and buff underparts streaked with brown.

Distribution and habitat

Range

The African jacana (Actophilornis africanus) is endemic to , with a broad distribution extending from and in the west to and in the east, and southward through the belt to , excluding the extreme southwestern region. The species is absent from extensive arid zones, including the Desert to the north and the Desert along the southwestern coast, while its presence in the is patchy and dependent on local water availability. Throughout its range, the African jacana is generally common to abundant, particularly in wetland-rich areas such as the and the Nyl River floodplain, where densities of 3–5 birds per occur in optimal microhabitats, with area-wide densities of around 5 birds per km². The global population is estimated at approximately 1,000,000 individuals, or 667,000 mature birds. The ' range has remained stable historically, with the current distribution closely matching records from over a century ago and no major contractions documented in recent assessments (as of 2024); population trends are also considered stable over recent generations.

Habitat

The African jacana (Actophilornis africanus) inhabits permanent or seasonally flooded shallow freshwater wetlands throughout , favoring areas with abundant floating and emergent vegetation that provide cover and stable platforms for movement. Preferred microhabitats include stagnant marshes, flooded grasslands, small lakes, ponds, dams, and the backwaters of slow-flowing rivers, where dense aquatic plants such as water lilies ( spp.), water hyacinth ( spp.), water lettuce (Pistia stratiotes), water fern ( spp.), and waterweed ( spp.) dominate. These birds avoid fast-flowing waters and saline environments, selecting instead shallow depths that support their specialized locomotion on floating mats. The occurs from up to 3,000 m in elevation, demonstrating adaptability to varied highland and lowland conditions. African jacanas exhibit tolerance to seasonal fluctuations, including flooding and drying cycles, by undertaking nomadic movements to maintain access to suitable vegetated ; this mobility underscores their reliance on dynamic aquatic ecosystems for survival. Their intimate ecological association with floating not only offers concealment from predators but also creates symbiotic platforms essential for daily activities in these environments.

Behaviour

Diet and foraging

The African jacana (Actophilornis africanus) exhibits an omnivorous diet dominated by aquatic , supplemented by plant material. Primary prey includes such as water beetles, flies, and dragonfly nymphs, along with their larvae, as well as worms, spiders, crustaceans, and mollusks like snails. Small and seeds from floating vegetation also feature occasionally, with comprising the largest portion—approximately 56–64% of the diet—followed by worms (12–16%), insect larvae (5–8%), and snails (5–7%). Foraging occurs primarily on floating aquatic vegetation, where the bird's elongated toes and claws enable it to walk deliberately across lily pads and other mats without sinking, distributing its weight effectively. It probes the water surface or vegetation with its bill to pick items, often while in motion, and may upend lily pads to access hidden prey beneath. Less commonly, individuals swim or upend in shallow water to capture submerged food, though most activity involves surface pecking during daylight hours. Daily peaks during crepuscular periods, with heightened activity in the morning and late afternoon, accounting for 40–46% of observed behaviors across the day. Birds typically solitarily, in pairs, or in small dispersed family groups, rarely forming larger flocks. Seasonal shifts influence composition, as availability declines in the , prompting a modest increase in seed and plant matter consumption to about 6–7% of the diet compared to 4% in the .

Reproduction

The African jacana exhibits a polyandrous characterized by sex-role reversal, where females are the larger sex and take primary responsibility for defense while mating with multiple males, typically 1–4 per breeding season. In this system, a single female maintains a of males within her defended , laying sequential clutches for each mate; the number of mates can increase to as many as 7 in years of high rainfall and resource availability, allowing for more successful breeding attempts. Males, in contrast, perform all parental duties, including nest construction, incubation, and chick-rearing, which enables the female to focus on additional matings and maintenance. Breeding occurs year-round in equatorial regions with permanent wetlands but is seasonal elsewhere, aligning with the rainy period when water levels rise and vegetation proliferates. Clutch size typically ranges from 3 to 5 eggs, with 4 being most common; eggs are laid approximately 24 hours apart, usually in the early morning, and are pale brown to tan-yellow with dark brown or black markings, measuring about 30.5–37.4 mm × 21.5–24.8 mm. Nests consist of simple, shallow scrapes or pads lined with aquatic , often built on floating mats of lilies or other plants in shallow freshwater; these nests are frequently rebuilt or relocated after flooding, which is common in their habitats. Incubation is performed solely by the male and begins after the laying of the third , lasting approximately –26 days. During this period, males maintain a daytime nest attendance (incubation constancy) averaging 53%, with frequent short shifts off the nest—typically 9–11 minutes on and off—varying by ; constancy is higher on cooler days ( 71%) and lower on hot days (down to 44%), while nighttime incubation is continuous to sustain temperatures around 34.1°C. This male-only incubation aligns with the polyandrous strategy, as females depart to lay subsequent clutches, and nest losses due to predation or flooding ( 75% in some studies) often prompt renesting, with breeding success higher in wetter years supporting multiple clutches per female.

Vocalization

The African jacana (Actophilornis africanus) is a highly vocal species, employing a diverse array of strident calls for communication across various contexts. These vocalizations are typically delivered from the water surface or in low flight, aiding in territory maintenance, alarm signaling, and social interactions. A characteristic flight call consists of a rattling screech upon take-off, which evolves into a repeated “kaaaa kaaka-ka” as the bird alights or settles on vegetation. Alarm calls include loud scolding and rattling notes, often accompanied by sharp “chip” or “chit” sounds to alert others to potential threats. The species also produces raucous shrieks and rasping series such as “kreep-kreep-kreep,” which intensify during disturbances. Territorial disputes and aggressive encounters feature barking-like noises, described as a harsh “kyowrrr” or yowling barks, contributing to the bird's overall noisy demeanor. Contact calls between adults and offspring involve softer, moaning or groaning sounds, with adults using repetitive notes to summon or guide chicks, such as during or evasion of predators.

Conservation

IUCN status

The African jacana (Actophilornis africanus) is classified as Least Concern on the , last assessed in 2024 with no change since 2021. This status reflects its large extent of occurrence of 24,400,000 km² across and a stable global estimated at 1,000,000–1,000,001 individuals (2023), equivalent to 667,000 mature individuals. The assessment is based on IUCN criteria, including a wide distribution across multiple countries and no evidence of substantial declines over the past three generations (15.6 years, based on a generation length of 5.2 years), with trends monitored through data from and . The is generally common in suitable freshwater habitats across its range. Ongoing stability is attributed to the bird's adaptability to varying water levels and nomadic movements between .

Threats

The African jacana faces primary threats related to habitat alteration in its environments. drainage for and have led to significant local habitat loss, reducing the availability of floating vegetation essential for and nesting. Flooding from hydroelectric projects also contributes to degradation. may exacerbate these pressures by altering hydrological regimes, including irregular water levels that disrupt the ' nomadic movements and breeding cycles dependent on seasonal flooding. Competition from remains minimal, as the African jacana's specialized use of floating vegetation provides a niche with limited overlap. Conservation efforts include the species' occurrence in several protected areas and Important Bird and Biodiversity Areas (IBAs) across its range. The bird is not subject to targeted hunting. Ongoing monitoring through initiatives like the International Waterbird Census supports targeted mitigation to address these threats.

References

  1. https://ebird.org/species/afrjac1
  2. https://www.oiseaux-birds.com/card-african-jacana.html
  3. https://datazone.birdlife.org/species/factsheet/african-jacana-actophilornis-africanus
  4. https://www.biodiversitylibrary.org/item/10286#page/210/mode/1up
  5. https://www.biodiversitylibrary.org/item/35484
  6. https://www.worldbirdnames.com/bird/african-jacana/6165.html
  7. https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=176454
  8. https://doi.org/10.2173/bow.afrjac1.01
  9. https://birdsoftheworld.org/bow/species/afrjac1/cur/introduction
  10. https://avibase.bsc-eoc.org/species.jsp?avibaseid=D16D486D33F5C4C3
  11. https://www.waderquest.net/wp-content/uploads/2022/06/African-JacanaR.pdf
  12. https://www.creatureatlas.com/animals/african-jacana
  13. https://animals.sandiegozoo.org/animals/jacana
  14. https://thebdi.org/2024/09/25/african-jacana-actophilornis-africanus/
  15. https://www.researchgate.net/publication/278464187_Population_structure_and_breeding_system_of_the_sex-role_reversed_polyanduous_Bronze-winged_Jacana_Metopidius_indicus
  16. https://people.bu.edu/msoren/CluttonBrock.pdf
  17. https://researchspace.ukzn.ac.za/items/4d10e5ff-6fda-44b2-a4b1-b1112b4925c0
  18. https://www.oiseaux.net/birds/african.jacana.html
  19. http://sabap2.adu.org.za/docs/sabap1/240.pdf
  20. https://biolifejournals.com/pdffiles/cimg002159_11.42%2520BASHINGA12%25205-18.pdf
  21. https://southafrica.co.za/african-jacana.html
  22. https://www.researchgate.net/publication/343443981_DIURNAL_ACTIVITY_PATTERNS_AND_FEEDING_BEHAVIOUR_OF_AFRICAN_JACANA_ACTOPHILORNIS_AFRICANUS_GMELIN_IN_LAKE_HAWASSA_ETHIOPIA
  23. https://www.tandfonline.com/doi/pdf/10.1080/00306525.1995.9633759
  24. https://www.tandfonline.com/doi/pdf/10.1080/02541858.1993.11448285
  25. https://a-z-animals.com/animals/african-jacana/
  26. https://macaulaylibrary.org/audio/135964
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