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Phylogeography of California$
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Kristina A. Schierenbeck

Print publication date: 2014

Print ISBN-13: 9780520278875

Published to California Scholarship Online: January 2015

DOI: 10.1525/california/9780520278875.001.0001

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Consistent Phylogeographic Patterns across Taxa and Major Evolutionary Events

Consistent Phylogeographic Patterns across Taxa and Major Evolutionary Events

(p.209) 14 Consistent Phylogeographic Patterns across Taxa and Major Evolutionary Events
Phylogeography of California

Kristina A. Schierenbeck

University of California Press

Consistent Phylogeographic Patterns across Taxa and Major Evolutionary Events Mediterranean to alpine climates (combined with vicariant events associated with glaciations, changing sea levels, and rapid mountain formation) have resulted in the formation of deep and shallow divergences. Significant events include the formation of the Klamath-Siskiyou ranges, the Coastal Range, and the Transverse and Peninsular Ranges; growth of and glaciation events in the Sierra Nevada; Bering Land Bridge; stabilization of the Mediterranean climate; connection between North and South America; connection between the Pacific Ocean and the Central Valley in the Monterey area; flooding of the Los Angeles Basin and the Salton Trough, formation of the Channel Islands and their connections to land, and the Bouse Embayment. Refugia and high levels of diversity for multiple taxa are identified in multiple regions that reflect both diversification and hybridization through secondary contact. Questions remain about the extent of differentiation of species in alpine environments; further exploration is warranted in areas identified with high levels of neoendemism. Regional analyses of species origins would provide insight into the development of the California biota, particularly in areas that are known suture zones. The concordance of phylogeographic breaks across divergent taxa supports the commonality of processes that shape the speciation of the biota of California. It is important to consider the influences of life-history characteristics and ecological requirements that affect lineages differently in time and space.

Keywords:   Miocene, Paleozoic, Pleistocene, last glacial maximum, Beringia, Refugia, hybridization, geographic structuring

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