Support for Baker's Law-As a Rule

Evolution ◽  
1967 ◽  
Vol 21 (4) ◽  
pp. 853 ◽  
Author(s):  
Herbert G. Baker
Keyword(s):  
Baker’S Law

scholarly journals Dynamics of apomictic and sexual reproduction during primary succession on a glacier forefield in the Swiss Alps

2019 ◽  
Author(s):  
Christian Sailer ◽  
Jürg Stöcklin ◽  
Ueli Grossniklaus
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
Primary Succession ◽  
Swiss Alps ◽  
Reproductive Assurance ◽  
Glacier Forefield ◽  
Early Stages ◽  
Hieracium Pilosella ◽  
Baker’S Law ◽  
Successional Stages

AbstractApomixis, the asexual reproduction through seeds, is thought to provide reproductive assurance when ploidy is not even and/or when population density is low. Therefore, apomicts are expected to be more abundant, and the frequency of apomictic offspring higher, at early stages of primary succession when mates are rare.To test this hypothesis, we sampled facultative apomictic Hieracium pilosella L. along the successional gradient on a glacier forefield and determined their ploidy, the level of apomixis in their offspring, and the genetic diversity of the entire meta-population and within subpopulations.We found that apomixis is more common in odd- and aneuploid cytotypes, which are more frequent at early stages of primary succession. However, apomixis was uncommon at all successional stages and sexual hexaploids were dominating throughout. Reproductive assurance was reflected in the higher fertility of all odd-ploid apomictic plants (3x, 5x) by avoiding meiosis, illustrating that apomixis provides an escape from sterility, as proposed by Darlington. Odd-ploid plants are supposedly better colonizers (Baker’s law), which is supported by their higher occurrence close to the glacier snout. Independent of succession, we found gene flow between apomicts and sexuals, which allows for the continuous creation of new apomictic and sexual genotypes.We conclude that apomixis in H. pilosella does indeed provide an escape from sterility, and therefore reproductive assurance, in aneuploid cytotypes. We further propose that apomixis preserves beneficial combinations of unlinked alleles in every generation for as long as apomictic genotypes persist in the population.

scholarly journals A test of baker’s law: breeding systems of invasive species of Asteraceae in China

2010 ◽  
Vol 13 (3) ◽  
pp. 571-580 ◽  
Author(s):  
Jian H. Hao ◽  
Sheng Qiang ◽  
Thomas Chrobock ◽  
Mark van Kleunen ◽  
Qian Q. Liu
Keyword(s):  
Invasive Species ◽  
Breeding Systems ◽  
Baker’S Law

scholarly journals DEMOGRAPHY, POLLINATION, AND BAKER'S LAW

Evolution ◽  
2011 ◽  
Vol 65 (5) ◽  
pp. 1511-1513 ◽  
Author(s):  
Jeremiah W. Busch
Keyword(s):  
Baker’S Law

scholarly journals Heterogeneity in local density allows a positive evolutionary relationship between self-fertilisation and dispersal

2017 ◽  
Author(s):  
James Rodger ◽  
Pietro Landi ◽  
Cang Hui
Keyword(s):  
Resource Competition ◽  
Local Density ◽  
Evolutionary Relationship ◽  
Negative Relationship ◽  
Theoretical Work ◽  
Extinction Rate ◽  
Range Edge ◽  
High Dispersal ◽  
Baker’S Law ◽  
The Relationship

AbstractTheoretical work predicts that dispersal and self-fertilisation (selfing) should always be negatively correlated and the Good Coloniser Syndrome (GCS) of high dispersal and selfing should not occur when both traits are free to evolve. This contradicts positive relationships between selfing and dispersal in empirical data. Critically, previous work assumes density of adults is spatially and temporally homogeneous, so selfing results in homogeneity in propagule production and competition, which eliminates the benefit of dispersal for escaping from local resource competition. We investigate the joint evolution of dispersal and selfing in a demographically structured metapopulation model where local density varies due to stochastic extinction-recolonisation dynamics. Increasing local extinction rate reduces local density across the metapopulation, which favours high selfing to mitigate mate limitation, but increases heterogeneity in density, which favours high dispersal for escape from competition. Together, these effects produce a positive relationship between selfing and dispersal, and evolution of the GCS. Nevertheless, the relationship between selfing and dispersal is context-dependent, as varying dispersal cost yields a negative relationship. Our results imply that if spatiotemporal heterogeneity in environmental suitability increases towards the range edge, the GCS may evolve there, favouring further range expansion (Cf. Baker’s Law).

scholarly journals A Test of Baker’s Law: Breeding Systems and the Radiation of Tolpis (Asteraceae) in the Canary Islands

2008 ◽  
Vol 169 (6) ◽  
pp. 782-791 ◽  
Author(s):  
Daniel J. Crawford ◽  
Jenny K. Archibald ◽  
Danielle Stoermer ◽  
Mark E. Mort ◽  
John K. Kelly ◽  
...  
Keyword(s):  
Canary Islands ◽  
Breeding Systems ◽  
Baker’S Law

The scope of Baker's law

2015 ◽  
Vol 208 (3) ◽  
pp. 656-667 ◽  
Author(s):  
John R. Pannell ◽  
Josh R. Auld ◽  
Yaniv Brandvain ◽  
Martin Burd ◽  
Jeremiah W. Busch ◽  
...  
Keyword(s):  
Baker’S Law

scholarly journals SUPPORT FOR BAKER'S LAW-AS A RULE

Evolution ◽  
1967 ◽  
Vol 21 (4) ◽  
pp. 853-856 ◽  
Author(s):  
Herbert G. Baker
Keyword(s):  
Baker’S Law

scholarly journals BAKER'S LAW REVISITED: REPRODUCTIVE ASSURANCE IN A METAPOPULATION

Evolution ◽  
1998 ◽  
Vol 52 (3) ◽  
pp. 657-668 ◽  
Author(s):  
John R. Pannell ◽  
Spencer C. H. Barrett
Keyword(s):  
Reproductive Assurance ◽  
Baker’S Law
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