scholarly journals Mating systems and population structure in two closely related species of the wheat group II. Environmental factors and population structure

Heredity ◽  
1973 ◽  
Vol 30 (1) ◽  
pp. 73-83 ◽  
Author(s):  
J Hillel ◽  
G Simchen ◽  
M W Feldman
Keyword(s):  
Population Structure ◽  
Environmental Factors ◽  
Related Species ◽  
Mating Systems ◽  
Closely Related Species ◽  
Wheat Group ◽  
Group Ii

scholarly journals Genomic compatibility occurs over a wide range of parental genetic similarity in an outcrossing plant

2005 ◽  
Vol 272 (1570) ◽  
pp. 1333-1338 ◽  
Author(s):  
Yvonne Willi ◽  
Josh Van Buskirk
Keyword(s):  
Mate Choice ◽  
Inbreeding Depression ◽  
Related Species ◽  
Genetic Similarity ◽  
Mating Systems ◽  
Hybrid Breakdown ◽  
Offspring Performance ◽  
Closely Related Species ◽  
Wide Range ◽  
Broad Scale

The theory of inbreeding and outbreeding suggests that there is a hump-shaped relationship between the genetic similarity of sexually reproducing parents and the performance of their offspring. Inbreeding depression occurs when genetic similarity is high, whereas hybrid breakdown is expected when genetic similarity is low. Between these extremes, the effect of genetic similarity on fitness is unclear. We studied the shape of this relationship by crossing 65 target genotypes of the clonal, self-incompatible Ranunculus reptans with partner genotypes spanning a broad scale of genetic similarity, ranging from crosses within populations to between-population crosses and hybridisation with a closely related species. Offspring were raised in outdoor tubs. Results revealed a quadratic relationship between parental genetic distance and offspring performance, with the clonal component of fitness more strongly hump-shaped than the sexual component. Optimal genetic similarity encompassed a broad range of within-population and between-population crosses. This pattern of genomic compatibility has important implications for the evolution of mating systems and mate choice.

The effect of silt on the parental behaviour of the sea stickleback, Spinachia spinachia

1988 ◽  
Vol 68 (2) ◽  
pp. 277-285 ◽  
Author(s):  
G. W. Potts ◽  
M. H. A. Keenleyside ◽  
J. M. Edwards
Keyword(s):  
Environmental Factors ◽  
Related Species ◽  
Major Part ◽  
Environmental Changes ◽  
Experimental Treatment ◽  
Male Fish ◽  
Closely Related Species ◽  
Parental Behaviour ◽  
Before And After ◽  
Spinachia Spinachia

The sea stickleback, Spinachia spinachia, lives in shallow coastal and estuarine waters where the male builds a nest and undergoes a protracted period of parental care. The accumulation of silt in the nest has been suggested as one of the environmental factors that regulate nest-directed activities during the parental phase. Experiments have quantified the behaviour of the male fish before and after the application of silt to the nest and shown that some behaviours are affected. The fanning activity, attendance at the nest and other nest-directed activities were examined and it was found that nest inspection and nest pushing increased significantly following the application of silt. Fanning activity, a major part of the parental behaviour of the sticklebacks, was unaffected by the experimental treatment and seems to be unresponsive to environmental changes. The results are discussed in relation to the functional significance of parental behaviour, and compared with a closely related species.

A review of the systematics and distribution of Chydorus ventricosus Daday, 1898, with the first description of the male and redescription of the species

1986 ◽  
Vol 64 (4) ◽  
pp. 818-832 ◽  
Author(s):  
R. Rajapaksa ◽  
C. H. Fernando
Keyword(s):  
Population Structure ◽  
Sri Lanka ◽  
Critical Review ◽  
Related Species ◽  
Accurate Diagnosis ◽  
Review Of The Literature ◽  
Comprehensive Description ◽  
Closely Related Species ◽  
Oriental Region ◽  
Type Series

Based on the study of the type series and material from Sri Lanka, a comprehensive description of Chydorus ventricosus Daday is given including the first description of the male. The detailed morphology of all instars of females and males, population structure, and some biological notes are also provided. This species was considered a tropicopolitan species based on previous records from Asia, America, and Africa. However, a detailed study of populations from a wide area of the Oriental region and material previously designated as Chydorus ventricosus from America and Africa, and a critical review of the literature indicates that it is very probably restricted to the Oriental region. Chydorus ventricosus closely resembles an undetermined number of taxa. Only a detailed study will determine their status. We have compared it with the only two well-described, closely related species. The present study has characterized all stages of Chydorus ventricosus. This will enable accurate diagnosis of this species.

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