Flight calls are also given. (1974). In our region, only Northern jacanas characteristically practice this form of polyandry. 2:59. We document coincident cline centers for three phenotypic traits, mtDNA, and one of two autosomal introns. Northern Jacana (Jacana spinosa) | HBW Alive. Jenni and Collier, ; Kaufman, Northern jacanas occasionally forage in wet grassy areas and flooded fields. Results We describe a narrow hybrid zone in southwestern Panama between two polyandrous freshwater waders: Northern Jacana, Jacana spinosa and Wattled Jacana, J. jacana.
Nature on PBS 3,882,502 views. The Northern Jacana is a resident in the lowlands of Mexico and Central America from Sinaloa and Tamaulipas to western Panama, where it is replaced by the Wattled Jacana (Jacana jacana).It also occurs sporadically in the U.S. on the coastal plain of Texas from south of Houston, where it formerly bred, westward to San Antonio and southward to the Mexican border. Retrieved 26 November They occur mainly in coastal areas. Females are nearly 70% heavier than Northern jacana (1,321 words) exact match in snippet view article find links to article the adaptiveness of polyandry in the Northern Jacana." Jacana spinosa. Language: English Location: United States Restricted Mode: Off History Help Northern jacana. Philosophical. Evolution favors whatever works, and for the jacana, what works is quite different. American Zoologist. Received 4 Feb. 1991, accepted 10 April 1991. The breeding system in northern jacanas is unusual and is an example of polyandry. To begin with, female jacanas weigh 60 percent more than males … Insufficient data exist to conclude whether a single explanation for the evolution of classical polyandry is possible for all species exhibiting some form of this mating system. Cline widths for these six markers varied from seven to 142 km, with mtDNA being the narrowest, and …
Insufficient data exist to conclude whether a single explanation for the evolution of classical polyandry is possible for all species exhibiting some form of this mating system. Northern jacanas are diurnal and spend much of their time walking on emergent vegetation and searching for aquatic insects and seeds. NORTHERN Jacanas (Jacana spinosa) have one of the rarest breeding systems known among birds: resource-defense polyandry (Jenni 1974, Emlen and Oring 1977, Graul et al. Northern jacanas average mm in length with a wingspan averaging mm. for the adaptiveness of classical polyandry in the Northern Jacana. Two types of polyandry have been documented: simultaneous polyandry and sequential polyandry. Received 4 Feb. 1991, accepted 10 April 1991. Jenni, D.A. 1977). Unlike simple polyandry ... Northern Jacana, Jacana spinosa and Wattled Jacana, J. jacana. We document coincident cline centers for three phenotypic traits, mtDNA, and one of two autosomal introns. Avian polyandry takes two basic forms (Oring 1986). Juveniles are bi-colored with a white underside and a darker back, head, and neck. Map Legend Unclassified No subspecies specified Jacaana background of another recording. Wilson Bulletin 103 (4): 578-597. We document coincident cline centers for three phenotypic traits, mtDNA, and one of two autosomal introns. "Evolution of polyandry." RESULTS: We describe a narrow hybrid zone in southwestern Panama between two polyandrous freshwater waders: Northern Jacana, Jacana spinosa and Wattled Jacana, J. jacana.
The breeding system in northern jacanas is unusual and is an example of polyandry. Northern jacana Jacana Dad Rescues his Chicks from a Crocodile - Duration: 2:59. Northern jacanas appear to be common throughout most of their range, but could become spinosw with loss of … Females are larger and more aggressive than males, parental care is performed only by males, and females copulate with several males whereas each male copulates with only one female. Polyandrous mating systems, particularly in extreme cases such as the Northern Jacana (Jacana spinosa) (Jenni and Collier, 1972), seem to violate each of these predictions.
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