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The Austral Floristic Realm Revisited

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The Austral Floristic Realm Revisited Journal of Biogeography (J. Biogeogr.) (2007) 34, 1649–1660 GUEST The Austral floristic realm revisited EDITORIAL A. Moreira-Mun˜oz* Institute of Geography, University of Erlangen- Abstract Nu¨rnberg, Kochstrasse 4/4, 91054 Erlangen, The classification of the Earth’s flora into floristic regions has been the major goal Germany of plant geography since the 19th century. A detailed revision of 19th and 20th century classifications is presented herein, with particular emphasis on the deli- mitation of the Austral floristic realm. A comparison between Chile, New Zealand, and the Cape Floristic Region is made at the genus level. Using the vascular flora of these biogeographical regions, the analysis revises previous attempts to define the Austral realm, while also assessing differences made by changes in taxonomic delimitations from recent molecular phylogenetic studies. The results indicate that the Austral floristic realm can nowadays be better described as a circum-Antarctic generalized track, composed of some 60 genera and 15 families restricted to South America and Australasia, possibly including South Africa. *Correspondence: Andre´s Moreira-Mun˜oz, Keywords ´ Instituto de Geografia, P.Universidad Catolica Antarctica, Australasia, biogeographical classification, Cape Floristic Region, de Chile, Av. Vicun˜a Mackenna 4860, Santiago, Chile. Chile, floristic kingdom, New Zealand, panbiogeography, South Pacific track, E-mail: [email protected] southern South America. another because they contain plants that are restricted to that INTRODUCTION area, for which he coined the word ‘endemic’ (Cox & Moore, In historical biogeography significant developments are often 2005, p. 22). Following this observation, a major goal of reached through continuously challenging the parameters of floristic plant geography has been the classification of the Earth biogeographical classifications. Cox (2001) discussed the into floristic areas. A. P. de Candolle wrote ‘[…] from all these many inconsistencies in previous schemes and provided a facts, one may deduce that there are botanical regions; and by new global system of six phytogeographical kingdoms and this term I denote whatever areas that, with the exception of another of six mammal zoogeographical regions. While introduced species, have a certain number of plants that to commenting on this last scheme, Morrone (2002) proposed them are peculiar, and that can be called aboriginal’ (quoted by an integrated biogeographical scheme for all organisms Nelson, 1978, p. 283). Since then, there has been controversy composed of three kingdoms: a Holarctic kingdom, a over the most adequate global classification, and in particular, Holotropical kingdom, and an Austral one. Morrone contrasting views have been put forward for the Southern (2002) and Cox (2001) recognized a lack of studies that Hemisphere. A summary of floristic classifications since the compare the composition of different floras, especially ‘in beginnings of plant geography is given in Table 1 and is the case of that most surprising unit, the Antarctic kingdom, discussed hereafter. spread over several areas that are widely separated Gottfried R. Treviranus (1776–1837), one of the first geographically’ (Cox, 2001, pp. 511–512). It seems appro- naturalists to use the term ‘biology’, put forward a pioneering priate, therefore, to reanalyse the floristic relationships of the global floristic classification, dividing the world’s flora into southern territories. eight main floras (Hauptfloren). This early classification included an Antarctic flora (Antarktische Flor), which com- prised Chile, Magallanes, Tierra del Fuego, and New Zealand THE BIOGEOGRAPHICAL CLASSIFICATION OF (Treviranus, 1803). The Cape flora was included in an THE AUSTRAL TERRITORIES Afrikanische Flor. Treviranus was, to my knowledge, the first Augustin Pyramus de Candolle (1778–1841) was the first biologist to recognize explicitly the floristic relationship naturalist to notice that regions exist that are distinct from one between southernmost South America and New Zealand, ª 2007 The Author www.blackwellpublishing.com/jbi 1649 Journal compilation ª 2007 Blackwell Publishing Ltd doi:10.1111/j.1365-2699.2007.01757.x A. Moreira-Mun˜ oz Table 1 Summary of floristic classifications for southern South America, New Zealand and the Cape Region since the beginnings of plant geography. No. of No. of Southern Source realms regions South America New Zealand Cape Floristic Region Treviranus, 1803 8 – Antarktische Flor Antarktische Flor Afrikanische Flor Augustin – 20 Le Chili and les terres (Not explicitly Le cap de Bonne-Espe´rance, Pyramus de Magellaniques mentioned) ou l’extre´mite´ australe Candolle, 1820 de l’Afrique, hors des tropiques Schouw, 1823 25 – South of 42°: Neuseela¨ndisches Capland: Reich der Antarktisches Florenreich; Florenreich Stapelien [Apocynaceae] 42°–23°: Reich der Holzartigen und Mesembrianthemen Synanthereen [Compositae]; north of 23°: Reich der Cactus und Piper Alphonse de – 45 Le Chili (region 35), and la Region 15 La Region 40, le cap Candolle, 1835 Patagonie, la terre de Feu et Nouvelle-Hollande de Bonne-Espe´rance les iles Malouines (region 36) (Australia), l’ile de Van Die´men (Tasmania), la Nouvelle-Ze´lande, la Nouvelle-Cale´donie, l’ile de Norfolk Grisebach, 1872 – 24 Tropical Andean flora: Oceanische Inseln Kapland north to 23°; Chilenisches U¨ bergangsgebiet: 23°–34°; Antarktisches Waldgebiet: 34°–56° Engler, 1879; 431Su¨damerikanische Florenreich: Altoceanisches Florenreich: Altoceanisches Florenreich: Engler, 1882 north of 41°S; Altoceanisches temperate New Zealand; Gebiet des Caplandes Florenreich : south of 41°S Pala¨otropisches Florenreich: tropical New Zealand Drude, 1884 14 55 South of 41°: Antarktisches Neuseela¨ndisches Florenreich Florenreich von Su¨dafrika Florenreich; north of 41°: Andines Florenreich Drude, 1890 14 55 Andines Florenreich and Melanesisch- Neuseela¨ndisches Su¨dafrikanisches Florenreich Antarktisches Florenreich Reich and Antarktisches Florenreich Diels, 1908 6 Neotropis and Antarktis Palaeotropis Capensis Good, 1974; – 37 Antarctic kingdom, Patagonian Antarctic kingdom, South African kingdom, (1947) region, south of 41°; New Zealand region Cape Region Neotropical kingdom, Andean region, north of 41° Mattick, 1964 6 43 South: Antarktisches Florenreich; South of 45°: Antarktisches Kapla¨ndisches Florenreich north: Neotropisches Florenreich Florenreich; north of 45°: Pala¨otropisches Florenreich Takhtajan, 1961 6 37 Antarctic kingdom, Patagonian Antarctic kingdom, Cape kingdom region, south of 40°; Neotropical New Zealand region kingdom, Andean region, north of 40° Takhtajan, 1986 6 35 Holantarctic kingdom, Holantarctic kingdom, Cape kingdom Chile-Patagonian region, south New Zealand region of 25° to Antarctic peninsula and Malvinas Islands (Falkland Is.) Cox, 2001 5 – South American kingdom Australian kingdom African kingdom Morrone, 2002 3 12 Austral kingdom, Andean region Austral kingdom, Austral kingdom, Neozelandic region Cape or Afrotemperate region 1650 Journal of Biogeography 34, 1649–1660 ª 2007 The Author. Journal compilation ª 2007 Blackwell Publishing Ltd The Austral floristic realm revisited based on the early works of Molina, Forster, and Banks. (Drude, 1884). He therefore defined 14 floristic kingdoms and Treviranus noticed also the existence of an antitropical floristic 55 floristic regions (Gebiete). In this scheme, southern South element, i.e. genera present in temperate areas from both America was classified in an Antarktisches Florenreich, New hemispheres but absent in the Tropics, such as Pinguicula, Zealand and surrounding islands in a Neuseela¨ndisches Flor- Salix, [Notho]Fagus and Ribes. These relationships appeared to enreich, and the Cape Region in a Su¨dafrikanisches Florenreich. him surprising because at that time the known flora of Tierra Drude’s concern about the floristic and ecological differences del Fuego was composed of less than 40 species (Treviranus, soon led him to publish separate maps for floristic classifica- 1803, p. 132)! tion and for vegetation classification (Drude, 1887). He At this early stage, biogeographical representation was non- restated Schouw’s original idea, which was to raise the African existent. Two years later, in 1805, Jean B. Lamarck and Cape Region to the category of a floristic realm. Augustin Pyramus de Candolle published the ‘first biogeo- At the beginning of the 20th century, Ludwig Diels (1874– graphical map’ for the third edition of the Flore franc¸aise 1945), the successor of Engler in Berlin, synthesized Drude’s (Ebach & Goujet, 2006). A.P. de Candolle further classified the classification into six floristic realms. He divided Engler’s world flora into 20 floristic regions (de Candolle, 1820), but Altoceanisches Florenreich into an Antarktis,anAustralis and a this scheme still lacked a map. In 1823, Danish botanist Joakim Capensis (Diels, 1908). He considered the Australis as Frederik Schouw (1789–1852) published the first phytogeo- comprising Australia and Tasmania, and considered Melanesia graphical world map (Schouw, 1823; Mennema, 1985). and New Zealand as part of the Pala¨otropis. Southernmost Schouw proposed 25 floristic kingdoms or realms (Florenrei- South America retained its designation as a realm, the che). In his scheme, South America was divided into an Antarktis. Diels’ small but successful book had been reprinted Antarctic and a tropical realm (Reich der Holzartigen Synan- five times by 1958, and his realm classifications were retained thereen), and New Zealand and the Cape Region were awarded
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