Paleotropical Kingdom
Origin
A distinct community of vascular plants evolved millions of years ago, and are now found on several separate areas. Millions of years ago, the warmer and wetter areas supported a tropical adapted flora, including forests of
Over millions of years, these type of vegetation present, covered much of the tropics of Earth. Many species are today relicts of a type of vegetation disappeared, which originally covered much of the mainland of Africa, Madagascar, India, South America, Antarctica, Australia, North America, Europe, and other lands when their climate were more humid and warm. Although warm cloud forests disappeared during the glaciations, they re-colonized large areas every time the weather was favorable again. Most of the cloud forests are believed to have retreated and advanced during successive geological eras, and their species adapted to warm and wet gradually retreated and advanced, replaced by more cold-tolerant or drought-tolerant sclerophyll plant communities. Many of the existing species became extinct because they could not cross the barriers posed by new oceans, mountains and deserts, but others found refuge as species relict in coastal areas and Islands.
In the Carboniferous and Permian, New Zealand and New Caledonia were on the periphery of Gondwana, which included Africa, South America, Antarctica, India, New Zealand and Australia. Paleomagnetic data locate New Caledonia originally near the South Pole. In the Triassic and early Jurassic, Gondwana moved northward, warming the eastern margin. New Caledonia separated from
The ecological requirements of many of the species, are those of the laurel forest and like most of their counterparts laurifolia in the world, they are vigorous species with a great ability to populate the habitat that is conducive. The geographical isolation and special edaphic conditions helped to preserve it too.
Many members of the late Cretaceous – early Tertiary Gondwanan flora survived in islands and Coastal area's equable climate but were eliminated in mainland due to increasingly dry conditions.[1] When the large landmasses became drier and with a harsher climate, this type of forest was reduced to those boundaries areas.
Plants have limited
For example, genera,
Fossils dating from before the
Flora
The paleotropical
Subdivisions
African Subkingdom
10 endemic families (incl.
- Guineo-Congolian Province
- Usambara-Zululand Region
- Sudano-Zambezian Region (including tropical Asia west of the Gulf of Khambhat)
- Karoo-Namib Region
- St. Helena and Ascension Region
Madagascan Subkingdom
9 endemic families, more than 450 endemic genera, about 80% endemic species. It ceased to be influenced by the African flora in the Cretaceous, but underwent heavy influence of the Indian Region's flora.
- Madagascan Region
Indo-Malesian Subkingdom
11 endemic families (incl.
- Indian Region
- Indochinese Region
- Malesian Region
- Fijian Region
Polynesian Subkingdom
No endemic families, many endemic genera. The flora is mostly derivative from that of the Indo-Malesian Subkingdom.
Neocaledonian Subkingdom
New Caledonia lies on the southernmost edge of the tropical zone, near the Tropic of Capricorn.
This flora originated on the supercontinent Gondwana, and persist in current day New Guinea, Australia, New Zealand, New Caledonia and South America. This flora is fossil in Antarctica. The
See also
- Flora of the Coral Sea Islands
- Flora of India – Plants native to India
- Flora of Indonesia – native plants of Indonesia
- Flora of the Marquesas Islands
- Flora of St Helena
References
- ^ "MBG: Diversity, Endemism, and Extinction in the Flora and Vegetation of New Caledonia".
- ^ Тахтаджян А. Л. Флористические области Земли / Академия наук СССР. Ботанический институт им. В. Л. Комарова. — Л.: Наука, Ленинградское отделение, 1978. — 247 с. — 4000 экз. DjVu, Google Books.
- ^ Takhtajan, A. (1986). Floristic Regions of the World. (translated by T.J. Crovello & A. Cronquist). University of California Press, Berkeley, PDF, DjVu.