Purple-throated mountaingem

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Purple-throated mountaingem
Purple-throated Mountain-gem.jpg
Male in Costa Rica
Purple-throated mountaingem female.JPG
Female in Costa Rica

Least Concern (IUCN 3.1)[1]
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Apodiformes
Family: Trochilidae
Genus: Lampornis
Species:
L. calolaemus
Binomial name
Lampornis calolaemus
Salvin, 1865
Lampornis calolaemus map.svg
Range of L. calolaemus
Synonyms

Lampornis calolaema (lapsus)

The purple-throated mountaingem (Lampornis calolaemus) is a hummingbird that breeds in the mountains of southern Nicaragua, northern Costa Rica and western Panama. This bird inhabits forested areas in hilly terrain, and is found at altitudes from 800 to 2,500 m (2,600 to 8,200 ft).

It is replaced in southern Costa Rica by its close relatives, the white-throated and gray-tailed mountaingems, with which it is sometimes considered conspecific.[nb 1] These three species form a closely related group that evolved some 3.5 million years ago and has diversified since.[3]

Description[]

It is 10.5 cm (4.1 in) long. The male weighs 6.0 g (0.21 oz) and the female 4.8 g (0.17 oz). The shortish black bill is slightly curved.

The adult male has bronze-green upperparts and underparts except for a brilliant green crown, purple throat and dark grey tail. The female lacks the bright crown and throat, and has rich cinnamon underparts. Young birds resemble the female but have buff fringes to the upperparts plumage.

The call of this species is a sharp buzzy zeet.

  • composite showing effect of light reflection on colour of male's gorge, Mount Totumas cloud forest, Panama

  • Male at feeder

Ecology[]

The food of this species is mainly nectar, taken from a variety of flowers.[nb 2] For the Rubiaceae Psychotria elata and , it is the default pollinator.[4] Like other hummingbirds it also takes small insects as an essential source of protein. Male purple-throated mountaingems defend flowers and scrubs in their feeding territories, and are dominant over most other hummingbirds.

Females have slightly longer bills than males. There is some degree of niche differentiation between the sexes. Though both prefer flowers with a corolla 14–21 mm (0.55–0.83 in) long by 3.5–8 mm (0.14–0.31 in) wide, females far more often than males utilize plants with longer[nb 3] and thinner[nb 4] corollas.

The female purple-throated mountaingem is entirely responsible for nest building and incubation. She lays two white eggs in a deep plant-fibre cup nest 0.7–3.5 m (2.3–11.5 ft) high in a scrub, small tree or vine. Incubation takes 15–19 days, and fledging another 20–26.

Notes[]

  1. ^ Some taxonomies refer to this lumped species as the variable mountaingem (Lampornis castaneoventris).[2]
  2. ^ Namely (Acanthaceae), and (Gesneriaceae), and Psychotria elata (Rubiaceae). Other foodplants include assorted Alstroemeriaceae, Bromeliaceae, Campanulaceae, Ericaceae (e.g. ), Heliconiaceae and Zingiberales.[4][5]
  3. ^ Up to c.40 mm (1.6 in), e.g. Guzmania nicaraguensis (Bromeliaceae).[5]
  4. ^ Up to c.20 times as long as wide, e.g. (Acanthaceae), (Campanulaceae).[5]

References[]

  1. ^ BirdLife International (2016). "Lampornis calolaemus". IUCN Red List of Threatened Species. 2016: e.T22729036A95003901. doi:10.2305/IUCN.UK.2016-3.RLTS.T22729036A95003901.en. Retrieved 12 November 2021.
  2. ^ Stiles, F.G. (2014) [1999]. del Hoyo, J.; Elliott, A.; Sargatal, J.; Christie, D.A.; de Juana, E. (eds.). "Purple-throated Mountain-gem (Lampornis calolaemus)". Handbook of the Birds of the World Alive. Barcelona: Lynx Edicions. Retrieved 12 May 2015.
  3. ^ García-Moreno, Jaime; Cortés, Nandadeví; García-Deras, Gabriela M.; Hernández-Baños, Blanca E. (2006). "Local origin and diversification among Lampornis hummingbirds: A Mesoamerican taxon". Molecular Phylogenetics and Evolution. 38 (2): 488–498. doi:10.1016/j.ympev.2005.08.015. PMID 16257241.
  4. ^ a b Fenster, Charles B. (1991). "Selection on Floral Morphology by Hummingbirds". Biotropica. 23 (1): 98–101. doi:10.2307/2388696. JSTOR 2388696.
  5. ^ a b c Temeles, E.J.; Linhart, Y.B.; Masonjones, M.; Masonjones, H.D. (2002). "The role of flower width in hummingbird bill length-flower length relationships" (PDF). Biotropica. 34 (1): 68–80. doi:10.1111/j.1744-7429.2002.tb00243.x.
  • Stiles, F. Gary; Skutch, Alexander F. (1989). A Guide to the Birds of Costa Rica. Ithaca, NY: Cornell University. pp. 226–227. ISBN 978-0-8014-9600-4.

Further reading[]

External links[]


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