Diversification in North American arid lands: Niche conservatism, divergence and expansion of habitat explain speciation in the genus Ephedra

2012 ◽  
Vol 65 (2) ◽  
pp. 437-450 ◽  
Author(s):  
Israel Loera ◽  
Victoria Sosa ◽  
Stefanie M. Ickert-Bond
Keyword(s):  
North American ◽  
Arid Lands ◽  
Niche Conservatism

DOES NICHE CONSERVATISM PROMOTE SPECIATION? A CASE STUDY IN NORTH AMERICAN SALAMANDERS

Evolution ◽  
2006 ◽  
Vol 60 (12) ◽  
pp. 2604 ◽  
Author(s):  
Kenneth H. Kozak ◽  
John J. Wiens
Keyword(s):  
North American ◽  
Niche Conservatism

scholarly journals Ammonia-oxidizing archaea and bacteria are structured by geography in biological soil crusts across North American arid lands

2013 ◽  
Vol 2 (1) ◽  
pp. 9 ◽  
Author(s):  
Yevgeniy Marusenko ◽  
Scott T Bates ◽  
Ian Anderson ◽  
Shannon L Johnson ◽  
Tanya Soule ◽  
...  
Keyword(s):  
North American ◽  
Biological Soil Crusts ◽  
Arid Lands ◽  
Ammonia Oxidizing Archaea ◽  
Soil Crusts

Germination ecophysiology of the western North American species Osmorhiza depauperata (Apiaceae): implications of preadaptation and phylogenetic niche conservatism in seed dormancy evolution

2004 ◽  
Vol 14 (4) ◽  
pp. 387-394 ◽  
Author(s):  
Jeffrey L. Walck ◽  
Siti N. Hidayati
Keyword(s):  
New Mexico ◽  
North American ◽  
Low Temperatures ◽  
High Elevation ◽  
North American Species ◽  
Niche Conservatism ◽  
Cold Stratification ◽  
Warm Temperature ◽  
Phylogenetic Niche Conservatism ◽  
Morphophysiological Dormancy

Requirements for dormancy break and embryo growth were determined for seeds of the western North American species, Osmorhiza depauperata. Seeds were collected in August 2001 from Sandia Crest (3200 m elevation) and Las Huertas (2300 m), New Mexico (USA). Embryos in fresh seeds were c. 0.6 mm long, and they had to grow to c. 9–10 mm before the radicle emerged from the mericarp. Embryo growth occurred at low temperatures (1 and 5°C), and seeds germinated to high percentages at 1°C during 32 weeks of incubation in the light. No seeds germinated at 5, 15/6, 20/10, 25/15 or 30/15°C during 32 weeks of incubation. Although a 4–18 week warm-temperature (25/15°C) pretreatment increased germination rates at 1°C, it was unnecessary for a high percentage of seeds to germinate. Gibberellic acid (GA3, 10–1000 mg l–1) did not substitute for cold stratification. Seeds from the low-elevation population contained larger embryos and required less time to germinate than those from the high-elevation population. O. depauperata seeds have deep complex morphophysiological dormancy (MPD), which is similar to two other western North American congeners and an Asian congener, but different from two eastern North American congeners. Results from this study suggest that: (1) phylogenetic niche conservatism has played a role in the persistence of deep complex MPD in the three western North American species of Osmorhiza; and (2) the stimulatory effect from a warm pretreatment in species needing only cold stratification for dormancy break is a preadaptation that initiated the development of an absolute warm requirement in species needing both warm and cold stratification.

scholarly journals Community phylogenetics at the biogeographical scale: cold tolerance, niche conservatism and the structure of North American forests

2013 ◽  
Vol 41 (1) ◽  
pp. 23-38 ◽  
Author(s):  
Bradford A. Hawkins ◽  
Marta Rueda ◽  
Thiago F. Rangel ◽  
Richard Field ◽  
José Alexandre F. Diniz-Filho
Keyword(s):  
Cold Tolerance ◽  
North American ◽  
Niche Conservatism ◽  
Community Phylogenetics

DOES NICHE CONSERVATISM PROMOTE SPECIATION? A CASE STUDY IN NORTH AMERICAN SALAMANDERS

Evolution ◽  
2006 ◽  
Vol 60 (12) ◽  
pp. 2604-2621 ◽  
Author(s):  
Kenneth H. Kozak ◽  
JohnJ. Wiens
Keyword(s):  
North American ◽  
Niche Conservatism
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