Prickly pear (Opuntia galapageia)

loading
Opuntia galapageia profusa showing both columnar and flattened segmented stems, with flowers
loading
Loading more images and videos...

Prickly pear fact file

Prickly pear description

KingdomPlantae
PhylumTracheophyta
ClassMagnoliopsida
OrderCaryophyllales
FamilyCactaceae
GenusOpuntia (1)

During his explorations of the Galapagos Islands, Darwin recorded Opuntia galapageia in a simple sketch of a tree-like cactus with a compact crown of pads (4) (5). While most Opuntia galapageia do indeed have well-developed trunks and rounded crowns (6) (7), some are more low-growing and shrubby in appearance (2). The flat, fleshy green pads are usually egg-shaped and dotted with evenly spaced clusters of 5 to 35 yellow to brown spines that are an obvious deterrent to predators (2) (6) (8). The trunk, when present, is initially covered with spines, but with age, develops dark reddish ‘bark’ (2) (6). Yellow flowers arise amongst the spine clusters and eventually develop into the spiny, spherical to oblong fruit, for which the genus gets the name ‘prickly pear’ (6).

Size
Max height: 5 m (2)
Top

Prickly pear biology

The six species of Opuntia found in the Galapagos are one of the principal sources of food for animals occupying areas of lowland. Tortoises and land iguanas eat the pads; doves, mockingbirds and iguanas eat the fruit; and finches eat the flowers, fruits and seeds, and obtain water from the succulent pads (8). Indeed Darwin was one of the first to notice the predilection of cactus finches for the fruits and flowers of Opuntia galapageia in particular (5). The animals that feed upon the fruit of Opuntias provide an indispensable service in dispersing the seeds stored within the nutritious flesh (8).

Top

Prickly pear range

Endemic to the Galapagos, the three subspecies all occur on different islands. Opuntia galapageia galapageia is found on Bartolomé, Santiago and Pinta Islands (7), O. g. macrocarpa is found on Pinzón Island, and O. g. profusa is found on Rábida Island (6).

Top

Prickly pear habitat

Opuntia galapageia generally grows in the arid zone near sea level but is sometimes found in more forested areas at higher altitude (6) (7).

Top

Prickly pear status

Classified as Endangered (EN) on the IUCN Red List (1) and listed on Appendix II of CITES (3). Subspecies Opuntia galapageia galapageia is classified as Endangered (EN) on the IUCN Red List (1) and listed on Appendix II of CITES (3) and O. g. macrocarpa and O. g. profusa are classified as Vulnerable (VU) on the IUCN Red List (1) and listed on Appendix II of CITES (3).

IUCN Red List species status – Least Concern

Top

Prickly pear threats

In common with much of the native flora of the Galapagos, Opuntia populations have been negatively affected by agriculture, urbanisation, and the introduction of non-native animals and plants (8). Owing in particular to damage caused by feral animals such as goats and donkeys, Opuntia galapageia is now scarce in parts of its range where it was once abundant (4) (8) (9).

Top

Prickly pear conservation

With so many of the Galapagos’s native animals dependant on Opuntias, the conservation of this cactus genus is critically important in the preservation of the archipelago’s renowned biodiversity (10). The Charles Darwin Foundation is undertaking detailed surveys of Opuntia populations to establish appropriate conservation actions for each species. This is likely to involve the eradication of feral herbivores which has already been carried out successfully on several of the islands (8).

Top

Find out more

For further information on the conservation of endemic flora and fauna of the Galapagos see:

Top

Authentication

This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact: arkive@wildscreen.org.uk
Top

Glossary

Subspecies
A population usually restricted to a geographical area that differs from other populations of the same species, but not to the extent of being classified as a separate species.
Top

References

  1. IUCN Red List (November, 2008)
    http://www.iucnredlist.org
  2. McMullen, C.K. (1999) Flowering Plants of the Galapagos. Cornell University Press, New York.
  3. CITES (November, 2008)
    http://www.cites.org
  4. Estes, G., Grant, K.T. and Grant, P.R. (2000) Darwin In Galápagos: His Footsteps Through The Archipelago. Notes and Records of the Royal Society, 54(3): 343 - 368.
  5. Darwin, C.R. (1841) The Zoology of the Voyage of H.M.S. Beagle, Under the Command of Captain FitzRoy, R.N., During the Years 1832–1836. Part III: Birds. Smith Elder, London. Available at:
    http://darwin-online.org.uk
  6. Anderson, E.F. (2001) The cactus family. Timber Press, Portland, Oregon.
  7. Hamann, O. (2001) Demographic studies of three indigenous stand-forming plant taxa (Scalesia, Opuntia, and Bursera) in the Galapagos Islands, Ecuador. Biodiversity and Conservation, 10: 223 - 250.
  8. Charles Darwin Foundation. (2006) Charles Darwin Research Station Fact Sheet: Opuntia cactus. Charles Darwin Foundation for the Galapagos Islands (AISBL), Galapagos, Ecuador. Available at:
    http://www.darwinfoundation.org/files/species/pdf/opuntia-en.pdf
  9. Carrion, V., Donlan, C.J., Campbell, K., Lavoie, C. and Cruz, F. (2007) Feral donkey (Equus asinus) eradication in the Galápagos. Biodiversity and Conservation, 16: 437 - 445.
  10. Hart, G. and Hart, S. (2005) The Cacti and Fauna of the Galapagos Islands: Interactions and Interdependence. Cactus and Succulent Journal, 77(4): 164 - 169.
X
Close

Image credit

Opuntia galapageia profusa showing both columnar and flattened segmented stems, with flowers  
Opuntia galapageia profusa showing both columnar and flattened segmented stems, with flowers

© David Hosking / www.flpa-images.co.uk

FLPA - images of nature
Pages Green House
Wetheringsett
Stowmarket
Suffolk IP14 5QA
United Kingdom
Tel: +44 (0) 1728 861 113
Fax: +44 (0) 1728 860 222
pictures@flpa-images.co.uk
http://www.flpa-images.co.uk

X
Close

Link to this photo

ARKive species - Prickly pear (Opuntia galapageia) Embed this ARKive thumbnail link ("portlet") by copying and pasting the code below.

Terms of Use - The displayed portlet may be used as a link from your website to ARKive's online content for private, scientific, conservation or educational purposes only. It may NOT be used within Apps.

Read more about

X
Close

MyARKive

MyARKive offers the scrapbook feature to signed-up members, allowing you to organize your favourite ARKive images and videos and share them with friends.

Play the Team WILD game:

Team WILD, an elite squadron of science superheroes, needs your help! Your mission: protect and conserve the planet’s species and habitats from destruction.

Conservation in Action

Which species are on the road to recovery? Find out now »

This species is featured in:

Help us share the wonders of the natural world. Donate today!

Blog