The Hispaniolan crossbill (''Loxia megaplaga'') is a crossbill that is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found else ...

to the island of

Hispaniola Hispaniola (, also ; es, La Española; Latin and french: Hispaniola; ht, Ispayola; tnq, Ayiti or Quisqueya) is an island in the Caribbean that is part of the Greater Antilles. Hispaniola is the most populous island in the West Indies, and th ...

(split between

Haiti Haiti (; ht, Ayiti ; French: ), officially the Republic of Haiti (); ) and formerly known as Hayti, is a country located on the island of Hispaniola in the Greater Antilles archipelago of the Caribbean Sea, east of Cuba and Jamaica, an ...

and the

Dominican Republic The Dominican Republic ( ; es, República Dominicana, ) is a country located on the island of Hispaniola in the Greater Antilles archipelago of the Caribbean region. It occupies the eastern five-eighths of the island, which it shares with ...

), and the only representative of the ''Loxia'' genus in the

Caribbean The Caribbean (, ) ( es, El Caribe; french: la Caraïbe; ht, Karayib; nl, De Caraïben) is a region of the Americas that consists of the Caribbean Sea, its islands (some surrounded by the Caribbean Sea and some bordering both the Caribbean S ...

Taxonomy & evolution

It was formerly regarded as

conspecific Biological specificity is the tendency of a characteristic such as a behavior or a biochemical variation to occur in a particular species. Biochemist Linus Pauling stated that "Biological specificity is the set of characteristics of living organis ...

with the two-barred crossbill (''L. leucoptera''), from which it is now assumed it evolved. There is general acceptance that the origin of ''L. megaplaga'' can be traced to southern populations of ''L. leucoptera'' that were stranded on the highest pine-forested mountains in Hispaniola (the highest in all of the Caribbean) when the

glacier A glacier (; ) is a persistent body of dense ice that is constantly moving under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries. It acquires distinguishing features, such as ...

s and vast

temperate coniferous forest Temperate coniferous forest is a terrestrial biome defined by the World Wide Fund for Nature. Temperate coniferous forests are found predominantly in areas with warm summers and cool winters, and vary in their kinds of plant life. In some, needle ...

s started receding northward after end of the last glacial period at the beginning of the Holocene, some 10,000 years ago. The distance that now separates both species is of thousands of kilometers (from the Caribbean to the northern U.S. and Canada), making the story of the Hispaniolan crossbill an interesting one from an ecological and environmental point of view. This isolation is similar to that of the rufous-collared sparrow (''Zonotrichia capensis''), whose native range stretches from southern

Mexico Mexico ( Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Gua ...

as far south as

Cape Horn Cape Horn ( es, Cabo de Hornos, ) is the southernmost headland of the Tierra del Fuego archipelago of southern Chile, and is located on the small Hornos Island. Although not the most southerly point of South America (which are the Diego Ramí ...

, and is also absent from all Caribbean islands except Hispaniola.

Ecology

The bird feeds almost exclusively on the

seed A seed is an embryonic plant enclosed in a protective outer covering, along with a food reserve. The formation of the seed is a part of the process of reproduction in seed plants, the spermatophytes, including the gymnosperm and angiospe ...

s of the

Hispaniolan pine ''Pinus occidentalis'', also known as the Hispaniolan pine or Hispaniola pine, (or in Spanish: pino criollo ) is a pine tree endemic to the island of Hispaniola (split between the Dominican Republic and Haiti). Ecology It is the eponymous spec ...

tree (''Pinus occidentalis'') cones.

Conservation

Because of its restricted range, small population size, and reliance on threatened

Hispaniolan pine forests The Hispaniolan pine forests are a subtropical coniferous forest ecoregion found on the Caribbean island of Hispaniola, which is shared by Haiti and the Dominican Republic. The ecoregion covers , or about 15% of the island. It lies at elevations ...

, this species is listed as Endangered by the IUCN (International Union for Conservation of Nature and Natural Resources; BirdLife International 2008). The population is highly fragmented and is currently thought to be declining, primarily due to increased agricultural clearance and habitat loss. The mature population, which is thought to range somewhere between 400 - 2300 individuals, is concentrated primarily in the Sierra de Baoruco National Park, which lacks any active protection.

References

* Dod, Annabelle Stockton (1978). ''Aves de la República Dominicana''. Museo Nacional de Historia Natural, Santo Domingo, Dominican Republic. * Dod, A. S. (1992). ''Endangered and Endemic Birds of the Dominican Republic''. Cypress House

External links

BirdLife Species Factsheet
Hispaniolan crossbill Endemic birds of Hispaniola Birds of the Dominican Republic Birds of Haiti Hispaniolan crossbill Hispaniolan crossbill {{fringillidae-stub