Intensity of Reproductive Isolation between Sympatric and Allopatric Populations of Bufo americanus and Bufo fowleri

1955 ◽  
Vol 89 (848) ◽  
pp. 303-317 ◽  
Author(s):  
E. Peter Volpe
Keyword(s):  
Reproductive Isolation ◽  
Bufo Americanus ◽  
Allopatric Populations ◽  
Bufo Fowleri

The Original Descriptions of Bufo fowleri and Bufo americanus

Copeia ◽  
1931 ◽  
Vol 1931 (3) ◽  
pp. 94 ◽  
Author(s):  
George S. Myers
Keyword(s):  
Bufo Americanus ◽  
Bufo Fowleri

No character displacement for reproductive isolation between Drosophila bipectinata and Drosophila malerkotliana

Genome ◽  
1991 ◽  
Vol 34 (6) ◽  
pp. 849-852 ◽  
Author(s):  
B. N. Singh ◽  
Sujata Chatterjee
Keyword(s):  
Reproductive Isolation ◽  
Sexual Isolation ◽  
Character Displacement ◽  
Sympatric Populations ◽  
Allopatric Populations ◽  
Drosophila Bipectinata ◽  
Isolation Index ◽  
Drosophila Malerkotliana

To test whether character displacement for reproductive isolation between Drosophila bipectinata and Drosophila malerkotliana exists, the degree of sexual isolation was measured between their sympatric and allopatric populations. Although the isolation indices vary in different crosses, the average isolation index for sympatric populations is very close to that for allopatric populations. This shows no difference in the degree of sexual isolation between sympatric and allopatric populations of D. bipectinata and D. malerkotliana. Thus there is no evidence for the existence of character displacement for sexual isolation between these two closely related sympatric species.Key words: Drosophila bipectinata, Drosophila malerkotliana, sexual isolation, sympatric and allopatric populations.

scholarly journals The distribution of two morphological forms of Lutzomyia longipalpis (Lutz & Neiva) (Diptera: Psychodidae)

1985 ◽  
Vol 80 (2) ◽  
pp. 145-148 ◽  
Author(s):  
R. D. Ward ◽  
A. L. Ribeiro ◽  
L. Ryan ◽  
A. L. Falcão ◽  
E. F. Rangel
Keyword(s):  
Reproductive Isolation ◽  
Lutzomyia Longipalpis ◽  
Single Pair ◽  
Museum Collections ◽  
Southern Brazil ◽  
Eastern Area ◽  
Allopatric Populations ◽  
North Brazil ◽  
The One ◽  
Cuticular Structures

The males of the sandfly Lutzomyia longipalpis occur in two forms, one which bears a single pair of pale spots on tergite 4 and another in which an additional pair of spots characterizes tergite 3. Almost complete reproductive isolation between sumpatric populations of the two forms and between allopatric populations of the one-spot form has been reported (Ward et al., 1983). Micromorphological differences in cuticular structures on the spots have also been observed and may be sites of pheromone release (Lane & Ward, 1984). Detais of the known distribution of the two are based on the examination of new specimens captured in Brazil during 1982, as well as museum collections and specimens from other laboratories. Males with a single pair of pale spots have been found from Mexico to southern Brazil, whilst the two-spot form is found only from the state of Maranhão in North Brazil to Minas Gerais and the border with Paraguay. In the eastern area of Brazil the two forms occur sympatrically in some locations and separately in others.

Evidence of Pre-mating Reproductive Isolation in Two Allopatric Populations of the Vlei Rat, Otomys irroratus

Ethology ◽  
2010 ◽  
Vol 100 (1) ◽  
pp. 61-71 ◽  
Author(s):  
N. Pillay ◽  
K. Willan ◽  
J. Meester ◽  
J. Cooke
Keyword(s):  
Reproductive Isolation ◽  
Allopatric Populations

A comparison of cone and needle characters in Abies: a test of a new theory of evolution

1983 ◽  
Vol 61 (7) ◽  
pp. 1926-1930 ◽  
Author(s):  
Jack Maze
Keyword(s):  
Reproductive Isolation ◽  
Population Level ◽  
Dynamic Interaction ◽  
General Sense ◽  
Theory Of Evolution ◽  
Allopatric Populations ◽  
Evolutionary Event ◽  
Different Levels

One part of a new theory of evolution proposed by Wiley and Brooks is that evolution results in continually increasing complexity. This leads to the unique prediction that once speciation occurs and species are embarked on independent histories, developmentally independent characters will become more correlated. This was tested by comparing cone and needle characters for some Abies species from different levels in a hierarchy, i.e., from the population level, where one would predict low correlations, to the supraspecific level, where one would predict high correlations. In a general sense, these predictions were realized. The results also indicated approximately equal correlations between cone and needle characters at levels below the species. These results were unexpected since one would predict that allopatric populations in the analyses would be embarked on independent histories because they are reproductively isolated and this would show correlations between cone and needle characters. This implies that reproductive isolation may not be a basic evolutionary event but that the dynamic interaction between entropic decay of information and reproductive linkages, the view presented in the new theory of evolution mentioned above, may be.

scholarly journals Haldane's rule and other aspects of reproductive isolation observed in the Anastrepha fraterculus complex (Diptera: Tephritidae)

1999 ◽  
Vol 22 (4) ◽  
pp. 507-510 ◽  
Author(s):  
Denise Selivon ◽  
André L.P. Perondini ◽  
João S. Morgante
Keyword(s):  
Sex Ratio ◽  
Reproductive Isolation ◽  
Adult Emergence ◽  
Egg Hatching ◽  
Closely Related Species ◽  
Haldane’S Rule ◽  
Allopatric Populations ◽  
Haldane's Rule ◽  
Anastrepha Fraterculus ◽  
Biological Entities

Some aspects of reproductive isolation between allopatric populations of two closely related species of the Anastrepha fraterculus complex (A. fraterculus sp. 1 and sp. 2) were evaluated in laboratory conditions. Most of the crosses were fertile in each species as well as between sp. 2 females and sp. 1 males. In the reciprocal cross only 41.7% of the matings yielded viable progeny. Egg hatching occurred at similar rates within the two species, but was significantly lower in the crosses between the species. Adult emergence did not differ significantly among crosses. The sex ratio of adult progeny within each species, as well as in the hybrid progeny derived from sp. 1 females crossed to sp. 2 males, did not differ from the expected 1:1 ratio. However, in the crosses between sp. 2 females to sp. 1 males, a significant deviation in the sex ratio in favor of females was observed, according to the Haldane's rule. The results reinforce previous data which indicated that A. fraterculus sp. 1 and A. fraterculus sp. 2 are distinct biological entities.

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