The Puerto Rican Spindalis, Spindalis portoricensis, is a tanager endemic to the island of Puerto Rico. It is widely distributed throughout the island and is an important part of the Puerto Rican ecosystem because of its help in seed dispersal and plant reproduction. The Puerto Rican Spindalis is also the national bird of the United States Commonwealth of Puerto Rico.

Taxonomy

The Puerto Rican Spindalis was originally classified as Spindalis zena portoricensis, making it a subspecies of the Western Spindalis (Spindalis zena). In 1997, an article was published which presented an extensive analysis of the genus Spindalis. The report concluded, based on differences in weight, color, pattern, distribution, and voice, that a split of S. zena was necessary. Four distinct species were identified"?Spindalis dominicensis, Spindalis nigricephala, Spindalis portoricensis and Spindalis zena. S. zena was also subdivided into five subspecies: S. z. pretrei, S. z. salvini, S. z. benedicti, S. z. townsendi and S. z. zena. Specifically, the difference in vocalization, and the morphological differences associated with it, distinguishes S. portoricensis from S. dominicensis.

This bird is known as Reina Mora in Spanish.

Description

The Puerto Rican Spindalis exhibits sexual dimorphism with males being brightly colored and females being dully colored. Males are green colored above with an orange neck and chest. They have a black head with two white stripes running across it, with one above and one below the eyes. The tail and wings are gray to black with small white stripes at the tips. In contrast, the female is a dull olive-green color with slightly noticeable white stripes. Sexual dimorphism is also noticeable in weight and size. Females are slightly heavier but smaller in length than males. The male's weight ranges from 22.5 to 37.0 grams with an average of 30.8 grams while the female's ranges from 28.0 to 41.1 grams with an average of 33.5 grams. The length of the male's wings ranges from 82 to 88.5 mm with an average of 85.2 mm while the female's range from 80 to 85.5 mm with an average of 82.6 mm. The length of the male's tail ranges from 59 to 68 mm with an average of 63.3 mm while the female's range from 56 to 65.5 mm with an average of 60.6 mm.

Distibution and habitat Bird count of the Puerto Rican Spindalis (2004)

The Puerto Rican Spindalis is currently found more commonly in plantations than in their natural habitat, the forests of Maricao and the El Yunque National Forest. It may also be found in gardens, scavenging for flower nectar, and other areas where fruits are grown. It can be attracted to houses by sugar solution. It is distributed throughout the entire main island of Puerto Rico and rarely found above 1000 meters in elevation.

Ecology and Behavior

The Puerto Rican Spindalis are usually found in pairs but may travel in small flocks. These birds also engage in a behavior called mobbing. This is when a flock of birds, from one or more species, attack a known predator, usually to defend their eggs or hatchlings. Such behavior has been observed being directed against the Puerto Rican Boa by immature Puerto Rican Spindalis.

The vocalization of the Puerto Rican Spindalis is not as complex as that of other Spindalis species; only the songs of S. dominicensis are less elaborate. As with all Spindalis, the males emit high pitched sounds at 8 KHz or higher, usually from treetops high above the ground. Females, on the other hand, sing "whisper songs" usually from dense areas close to the ground. The most common vocalization is described as a "continuing series of high-pitched, thin, sibilant notes, given in a rhythmic pattern." Other vocalizations include a fast "tweet" and a short "chi chi chi".

Diet

The Puerto Rican Spindalis is a frugivore. Common fruits eaten by this bird come from Schefflera morototoni, Cecropia schreberiana , Cordia sulcata, Ficus spp., Phoradendron spp. and Inga vera trees, with fruit from S. morototoni being the most important. Because of the difficulty of digestion and the small amount of energy that fruits and leaves provide, these birds also include insects and small lizards as part of their diet.

Reproduction

The Puerto Rican Spindalis builds cup-shaped nests from various plant matter. Two to four eggs are laid at a time. Eggs are usually light blue in color with brown patches around the large end, but regional variations are known to exist. They measure, on average, 23.7 by 17.3 mm.

See also

• List of endemic fauna of Puerto Rico
• List of national birds
• List of Puerto Rican birds

References and footnotes

1. ^ BirdLife International (2004). Spindalis portoricensis. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 12 May 2006. Database entry includes justification for why this species is of least concern
2. ^ National bird is the accepted/standard expression to refer to the representative bird denominated by a government. This expression does not reflect Puerto Rico's political status. To read about Puerto Rico's political status please refer here.
3. ^ Puerto Rico in Brief
4. ^ a b c d Taxonomy of the Stripe-Headed Tanager, Genus Spindalis (Aves:Thraupidae) of the West Indies
5. ^ Puerto Rican Spindalis
6. ^ Comparacion de la riqueza de aves entre plantaciones de pino hondureno (Pinus caribaea) y areas de bosque nativo en el Bosque Estatal de Carite, Cayey, Puerto Rico (Spanish)
7. ^ Avian Mobbing of the Puerto Rican Boa
8. ^ Crop Size and Fruit Neighborhood Effects on Bird Visitation

• Oberle, Mark (2003). Las aves de Puerto Rico en fotografías. Editorial Humanitas, 26. ISBN 0-9650104-2-2.  (Spanish)

External links Puerto Rico portal

• Enciclog
• Geography