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Edaphic differentiation in Lasthenia: A model for studies in evolutionary ecology

, : Edaphic differentiation in Lasthenia: A model for studies in evolutionary ecology. Madrono 50(1): 34-40, January-March

The current knowledge of the goldfield genus Lasthenia is discussed, emphasizing the possible role of edaphic factors in the divergence of this predominantly Californian genus. Lasthenia species occupy a wide array of edaphic habitats ranging from serpentine outcrops to salt flats to guano deposits, thriving under specific ion and osmotic conditions that are uninhabitable for the vast majority of species. Studies show that ion accumulation and sequestration are common strategies used to counter osmotic effects, common to most habitats harboring Lasthenia species. Inter- and intra-specific variation in tolerance to edaphic conditions has been observed in closely related yet reproductively isolated taxa, suggesting that edaphic factors may have set the stage for the diversification of this genus. Lasthenia provides numerous opportunities to examine the link between adaptation, reproductive isolation and speciation.


DOI: 10.2307/41425490

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