Coordinates: 33.6514 S 78.8232 W
No:280        (list of all attractions)
Category:Ecosystems
Values:Biology, Visual
Rank:2
Address:South America, Chile, V Valparaíso, Juan Fernández archipelago, eastern part of Robinson Crusoe Island (Masatierra)
Dominant species:Myrceugenia fernandeziana, Drymis confertifolia
Area:circa 5,000 ha
Robinson Crusoe Island, San Juan Bautista village in the forefront
Robinson Crusoe Island, San Juan Bautista village in the forefront.
Serpentus, Wikimedia Commons / CC BY-SA 3.0
Robinsonia berteroi - now extinct.
Robinsonia berteroi - now extinct.
from "The Natural history of Juan Fernandez and Easter Island, edited by Carl Skottsberg. Vol. 2., Botany"
Robinsonia masatierrae - extinct since 1986.
Robinsonia masatierrae - extinct since 1986.
from "The Natural history of Juan Fernandez and Easter Island, edited by Carl Skottsberg. Vol. 2., Botany"
Juan Fernández Firecrown - the only endemic hummingbird on oceanic island.
Juan Fernández Firecrown (Sephanoides fernandensis) - the only endemic hummingbird on oceanic island.
Héctor Gutiérrez Guzmán, Wikimedia Commons / CC BY 2.0

Juan Fernández islands over the last few million years have served as exciting laboratories of evolution - more than one hundred of endemic plant species have developed on these small islands. Unique in the world is forest on Robinson Crusoe Island - all tree species (some 20) of this small forest are endemic - growing ONLY in this forest.

History

Natural history

The volcanic Robinson Crusoe Island rose from the depths of Pacific some 4.2 - 3.8 million years ago. It is located some 600 km from South America. The island is 9,300 ha large, the highest summit is El Yunque, 916 m.

Climate on the island is sub-tropical, mild and rainy - no wonder that the island got covered with dense vegetation. Plants arrived here occasionally - some by the streams, some were brought by occasional birds. Some plants on the island are relicts - their closer relatives were living on continents but are extinct now. Over the time here evolved numerous local species of plants.

Colonies

The unique ecosystem has survived on this small islands thanks to the fact that the people came here late. Juan Fernández islands were discovered in 1574 and small settlement here was established in 1591 - 1596.

Unfortunately with the establishment of the first colony started the introduction of alien plants and animals - goats, pigs, dogs. Colonies on the island were abandoned and then again established, there were living also castaways, including Alexander Selkirk - the possible prototype of Robinson Crusoe.

Unfortunately the coming of the people brought catastrophic change to the ecosystem. Forests have been logged and burned, unknown number of unique species have been exterminated by the introduced animals and plants.

The forest was nearly intact until the early 19th century, but then logging started here. In late 19th century started intense soil erosion and islanders were forced to make forest plantations in some parts of the island to prevent the loss of soil. Unfortunately erosion prosesses continue here up to this day.

National park and research

The government of Chile declared a national park here in 1935. In 1977 islands became a UNESCO approved Biosphere Reserve.

Today Robinson Cruzoe island is recognized attraction point to many scientists. There are few other small islands in the world with that much scientific work devoted to them.

Much effort is put to preserve the unique natural heritage. 8.3 km long fence was built to prevent the cattle from entering into forest.

The biggest danger to the ecosystem of Robinson Crusoe Island is created by alien plants. Three such plants are especially dangerous to the local plants: Aristotelia chilensis, Ugni molinae and Rubus ulmifolius. It seems that this terrible trio alone could replace all the local vegetation over the next 70 years.

Ecolocigal hotspot

Extraordinary endemism on these islands makes them unique in the world, with a specific ecosystem - Juan Fernández Islands temperate forests - met only on Juan Fernández archipelago (basically - Robinson Crusoe Island). As a result Juan Fernández Islands are one of two ecological mini-hotspots in the world - another is Galapagos islands.

Robinson Crusoe Island offers fantastic scenery, with more than 600 m tall sea cliffs and magnificent mountains and ravines. The part of the island, which rises above 600 m height, is constantly shrouded in clouds - the forest there is soaked, water is dripping from the leaves constantly.

The forest in Robinson Crusoe Island is divided by the altitude zones. Tall forest (with much impact from alien species) grows in 300 - 500 m height, lower montane forests - 500 - 700 m, tree fern forests - 700 - 750 m and high brushwood on exposed cliffs - at 500 - 850 m height.

These forests are different - but all of them are composed from endemic tree species, unique in the world.

Endemics

132 species of plants on Juan Fernández islands are endemic (with 1 endemic plant family and 12 endemic genes). Most of these plant species are met only on Robinson Crusoe Island. 79 species are native - but met elsewhere as well. And a huge lot - some 260 species - are introduced by man.

Amazing is the diversity of ferns - out of 53 species of local ferns 23 are endemic. Happily ferns withstand the degradation of the ecosystem much better.

Thus Robinson Crusoe Island has the highest density of endemic plants per unit of area in the world - no other oceanic island can compete in this respect.

Endemic animals

Less impressive is the number of endemic animal species. There are known more than 230 endemic insects (e.g. Kalotermes gracilignatus), but most interesting are the birds.

Juan Fernández Firecrown (Sephanoides fernandensis) is a rare and endangered hummingbird, the only endemic hummingbird on oceanic island. Although the native forest is the original habitat of this beautiful bird, today they often are seen in the gardens in San Juan Bautista village.

Another endemic forest bird is Juan Fernández Tit-Tyrant (Anairetes fernandezianus).

Endemic plant species of Robinson Crusoe forest

This list is not exhaustive - there are even more endemic species of plants!

  1. Apium fernandezianum
  2. Arthropteris altescandens - fern, grows also on Masafuera island
  3. Asplenium macrosorum - fern, also on Masafuera island
  4. Asplenium stellatum - fern, also on Masafuera island
  5. Azara serrata var. fernandeziana - shrub with yellow flowers
  6. Berberis corymbosa - small shrub with yellow flowers, grows on cliffs
  7. Blechnum cycadifolium - tree fern, also on Masafuera island, forms very dense stands.
  8. Blechnum mochaenum - small fern, also on Masafuera island
  9. Blechnum schottii - a beautiful fern, climber
  10. Boehmeria excelsa - tree
  11. Carex berteroniana - grass, also on Masafuera island
  12. Centaurodendron dracaenoides - tree with impressive flowers
  13. Centaurodendron palmiforme - very rare tree
  14. Chenopodium crusoeanum
  15. Chenopodium sanctae-clara - tree, today found only on a small island next to Robinson Crusoe Island
  16. Chusquea fernandeziana - bamboo
  17. Colletia spartioides - grows on cliffs
  18. Coprosma oliveri - shrub or tree
  19. Coprosma pyrifolia - tree, also on Masafuera island
  20. Cuminia eriantha var. eriantha - a shrub with beautiful flowers
  21. Cuminia eriantha var. fernandezia
  22. Cuminia fernandezia - a shrub with beautiful flowers
  23. Dendroseris berteroana
  24. Dendroseris litoralis - tree. At one moment in 1980ies only 3 plants remained, still endangered. Beautiful orange flowers. Some plants are grown in local gardens.
  25. Dendroseris macrantha
  26. Dendroseris marginata - grows on cliffs
  27. Dendroseris micrantha
  28. Dendroseris neriifolia - a tree with white flowers, only two are remaining
  29. Dendroseris pinnata
  30. Dendroseris pruinata - white flowers, found also on small island next to Robinson Crusoe Island
  31. Dicksonia berteroana - tree fern, grows more than 5 m tall, mainly in upper montane forest
  32. Drimys confertifolia - tree, also on Masafuera island. Abundant, up to 25 m tall.
  33. Dysopsis hirsuta - herb
  34. Elaphoglossum squamatum - one remaining
  35. Erigeron fernandezianus - small herb, also on Masafuera island
  36. Eryngium bupleuroides - grows on cliffs
  37. Eryngium inaccessum
  38. Eryngium x fernandezianum
  39. Escallonia callcottiae
  40. Fagara  mayu - tree
  41. Greigia berteroii
  42. Gunnera bracteata - enormous, up to 1.5 m tall herb with large leaves, mainly in upper montane forest.
  43. Gunnera bracteata x peltata
  44. Gunnera glabra - a synonym for Gunnera peltata?
  45. Gunnera peltata - one of the most spectacular endemics on the island. This giant "rhubarb" grows up to 2 m tall and forms dense growes at the bottom of the deep ravines.
  46. Haloragis masatierrana
  47. Hymenophyllum cuneatum var. rariforme - fern in upper montane forest
  48. Hymenophyllum rugosum - fern in upper montane forest
  49. Juania australis - Chonta Palm, the only species in genus, up to 15 m tall
  50. Lactoris fernandeziana - small, flowering shrub, the only representative of Lactoridaceae family. Grows in cloud forest. The most exotic of the local plants.
  51. Machaerina scirpoidea
  52. x Margyracaena skottsbergii - a possible intergeneric cross between the local Margyricarpus diginus and introduced Acaena argentea. Possibly extinct on island, only in botanical garden in mainland Chile.
  53. Margyricarpus digynus - small herb
  54. Megalachne berteroana - grass, also on Masafuera island
  55. Megalachne masafuerana - grass, also on Masafuera island
  56. Megalastrum inaequalifolium - fern
  57. Myrceugenia fernandeziana - dominating tree in the forest, especially in upper montane forest, up to 25 m tall.
  58. Notholaena chilensis - small fern, also on Masafuera island
  59. Ochagavia elegans - beautiful bromeliad, grows on exposed cliffs
  60. Ophioglossum fernandezianum - fern
  61. Peperomia berteroana - also on Masafuera island
  62. Peperomia fernandeziana var. oblongifolia - herb, also on Masafuera island
  63. Peperomia margaritifera var. margaritifera
  64. Peperomia margaritifera var. umbraticola
  65. Pernettya rigida - grows on cliffs
  66. Plantago fernandezia
  67. Podophorus bromoides - extinct
  68. Polypodium intermedium subsp. intermedium - fern
  69. Polystichum tetragonum - fern, also on Masafuera island
  70. Pteris berteroana - fern, also on Masafuera island
  71. Raphithamnus venustus - called - Juan Bueno. Shrub and small tree with fine lilac flowers, grows also on Masafuera island
  72. Rea pruinata
  73. Robinsonia berteroi - tree, the last remaining plant died in Mai 2004
  74. Robinsonia evenia - yellow flowers
  75. Robinsonia gayana - greenish-yellow flowers, grows on cliffs
  76. Robinsonia gracilis - yellow flowers
  77. Robinsonia macrocephala - possibly extinct
  78. Robinsonia masatierrae - extinct since 1989
  79. Robinsonia thurifera
  80. Rumohra berteroana - fern, also on Masafuera island
  81. Santalum fernandezianum - became extinct due to extensive harvesting. Last seen in 1908.
  82. Selkirkia berteroii - shrub
  83. Serpyllopsis caespitosa - also on Masafuera island
  84. Solanum fernandezianum
  85. Sophora fernandeziana var. fernandeziana
  86. Sophora fernandeziana var. reedeana
  87. Spergularia confertiflora var. confertiflora - small herb, also on Masafuera island
  88. Spergularia confertiflora var. polyphylla - small herb, also on Masafuera island
  89. Thyrsopteris elegans - tree fern, the only species in genus, grows in upper montane forest. Met on Masafuera island as well.
  90. Trichomanes ingae - fern
  91. Trichomanes philippianum - fern
  92. Ugni selkirkii - shrub
  93. Uncinia douglasii - also on Masafuera island
  94. Urtica glomeruliflora - also on Masafuera island
  95. Wahlenbergia berteroi - one plant also on Santa Clara Island
  96. Wahlenbergia fernandeziana - small plant with wonderful white flowers
  97. Wahlenbergia grahamiae - small shrub with white flowers
  98. Wahlenbergia larrainii - possibly the same fernandeziana. Extinct in wild
  99. Yunquea tenzii - tree, no flowers of this tree have been seen, only 23 trees known

Map

See Forest on Robinson Crusoe Island on the map of Chile!

References

  1. Ana M. Abarzúa and Cecilia Smith‐Ramírez, Establishing the bases for a long term study about endemic biodiversity in Juan Fernández Archipelago, Chile. Centro de Estudios en Ecología y Biodiversidad (CASEB) Pontificia Universidad Católica de ChileGlobal Exploration. September 2010. Accessed in 07.01.2012.
  2. Juan Fernandez Islands temperate forests (NT0401). World Wildlife Fund. Accessed in 07.01.2012.
  3. Atholl Anderson, Simon Haberle, Gloria Rojas, Andrea Seelenfreund, Ian Smith and Trevor Worthy. An Archaeological Exploration of Robinson Crusoe Island, Juan Fernandez Archipelago. 2002. Accessed in 07.01.2012.
  4. Plantas endémicas del Archipiélago de las islas de Juan Fernández, a set of photographs in Flickr. Accessed in 07.01.2012.
  5. Clodomiro Marticorena, Tod F. Stuessy, and Carlos M. Baeza. Catalogue of the Vascular Flora of the Robinson Crusoe of Juan Fernandez Islands, Chile, Gayana, v. 55 no. 2 1998. Accessed in 07.01.2012.

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