Australia's Place in the Cosmopolitan World of Indo-West Pacific
Molecular Phylogenetics and Evolution 43 (2007) 645–659 www.elsevier.com/locate/ympev An island in the stream: Australia’s place in the cosmopolitan world of Indo-West Pacific freshwater shrimp (Decapoda: Atyidae: Caridina) Timothy J. Page a,*, Kristina von Rintelen b, Jane M. Hughes a a Australian Rivers Institute, Faculty of Environmental Sciences, Griffith University, Nathan Campus, Qld., 4111, Australia b Museum of Natural History, Humboldt-University Berlin, Invalidenstrasse 43, D-10115, Berlin, Germany Received 3 May 2006; revised 5 August 2006; accepted 8 August 2006 Available online 18 August 2006 Abstract Mitochondrial DNA sequences were used to investigate phylogenetic and biogeographic relationships among Australian freshwater shrimp from the genus Caridina H. Milne Edwards, 1837 (Atyidae) and congeners from potential source populations throughout the Indo-West Pacific region. Numerous Australian taxa have close evolutionary relationships with non-Australian taxa from locations throughout the region, indicating a diverse origin of the Australian freshwater fauna. This implies many colonisations to or from Aus- tralia over a long period, and thus highlights the surprising adeptness of freshwater shrimp in dispersal across ocean barriers and the unity of much of the region’s freshwater biota. Interestingly, a study on Australia’s other main genus of atyid shrimp, Paratya Miers, 1882, inferred only a single colonisation. A number of potential species radiations within Australia were also identified. This agrees with patterns detected for a large number of Australian freshwater taxa, and so implies a vicariant explanation due to the development of colder, dryer climates during the late Miocene/early Pliocene. Ó 2006 Elsevier Inc.
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