Habitat preferences and positive assortative mating in an avian hybrid zone

2010 ◽  
Vol 41 (3) ◽  
pp. 237-247 ◽  
Author(s):  
Fredrik Haas ◽  
Jonas Knape ◽  
Anders Brodin
Keyword(s):  
Assortative Mating ◽  
Hybrid Zone ◽  
Habitat Preferences ◽  
Positive Assortative Mating

The role of breeding behavior and habitat preferences on the reproductive isolation of three allopatric populations of ninespine stickleback, Pungitius pungitius

1977 ◽  
Vol 55 (10) ◽  
pp. 1601-1611 ◽  
Author(s):  
John R. Foster
Keyword(s):  
Assortative Mating ◽  
Habitat Preferences ◽  
Breeding Behavior ◽  
Pungitius Pungitius ◽  
Nest Location ◽  
Ninespine Stickleback ◽  
Positive Assortative Mating ◽  
Size Type ◽  
Nesting Substrate

Earlier studies have shown differences in morphology and reproductive behavior of Mississippi, Bering, and European populations of ninespine stickleback (Pungitius pungitius). In this study, assortative mating was examined experimentally to determine the role of habitat preference and breeding behavior as possible isolating mechanisms. Choice tests in naturalistic and uniform environments showed positive assortative mating in all but one pairing. One-hour latency tests gave similar results, while in the 24-h latency tests, interpopulation mating became prevalent. Although nesting habitat selection differences were found, courtship breakoff appeared to be a more important isolating mechanism. Failure to induce females to court was probably due to differences in male color, size, body proportions, and zigzag display. Failure to lead the female to the nest was probably related to differences in color and leading behavior, while failure to induce the female to enter the nest was probably related to differences in nesting substrate, nest location, and size, type, and number of entrances. The results of this study demonstrate that reproductive divergence among the three populations makes intrapopulation mating more likely than interpopulation mating.

scholarly journals Sexual Size Dimorphism and Positive Assortative Mating in Alpine Choughs (Pyrrhocorax graculus)

The Auk ◽  
2001 ◽  
Vol 118 (2) ◽  
pp. 553-556 ◽  
Author(s):  
Anne Delestrade
Keyword(s):  
Sample Size ◽  
Assortative Mating ◽  
Body Condition ◽  
Sexual Size Dimorphism ◽  
Morphological Characters ◽  
Positive Trend ◽  
Tarsus Length ◽  
Size Dimorphism ◽  
Positive Assortative Mating ◽  
Larger Sample

Abstract The degree of sexual size dimorphism in a number of different morphological characters was examined in a social corvid, the Alpine Chough, using measurements taken on 178 males and 144 females. A small amount of size dimorphism appeared in all morphological characters, and weight was the most dimorphic character. To identify if Alpine Choughs mate assortatively, measurements of mates were compared in 76 pairs. A positive assortative mating was found on tarsus length, and a small positive trend is suggested between body condition of partners, but that needs to be confirmed with a larger sample size.

scholarly journals Marry Your Like: Assortative Mating and Income Inequality

2014 ◽  
Vol 104 (5) ◽  
pp. 348-353 ◽  
Author(s):  
Jeremy Greenwood ◽  
Nezih Guner ◽  
Georgi Kocharkov ◽  
Cezar Santos
Keyword(s):  
Income Inequality ◽  
Assortative Mating ◽  
Household Income ◽  
The United States ◽  
Census Bureau ◽  
United States Census ◽  
United States Census Bureau ◽  
Positive Assortative Mating ◽  
High Level ◽  
Married Female

Has there been an increase in positive assortative mating? Does assortative mating contribute to household income inequality? Data from the United States Census Bureau suggests there has been a rise in assortative mating. Additionally, assortative mating affects household income inequality. In particular, if matching in 2005 between husbands and wives had been random, instead of the pattern observed in the data, then the Gini coefficient would have fallen from the observed 0.43 to 0.34, so that income inequality would be smaller. Thus, assortative mating is important for income inequality. The high level of married female labor-force participation in 2005 is important for this result.

scholarly journals Testing the Role of Habitat Isolation among Ecologically Divergent Gall Wasp Populations

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Scott P. Egan ◽  
Glen R. Hood ◽  
James R. Ott
Keyword(s):  
Reproductive Isolation ◽  
Assortative Mating ◽  
Host Plants ◽  
Habitat Preferences ◽  
Habitat Isolation ◽  
Native Plant ◽  
Gall Wasp ◽  
Quercus Virginiana ◽  
Respective Host

Habitat isolation occurs when habitat preferences lower the probability of mating between individuals associated with differing habitats. While a potential barrier to gene flow during ecological speciation, the effect of habitat isolation on reproductive isolation has rarely been directly tested. Herein, we first estimated habitat preference for each of six populations of the gall waspBelonocnema treataeinhabiting eitherQuercus virginianaorQ. geminata. We then estimated the importance of habitat isolation in generating reproductive isolation betweenB. treataepopulations that were host specific to eitherQ. virginianaorQ. geminataby measuring mate preference in the presence and absence of the respective host plants. All populations exhibited host preference for their native plant, and assortative mating increased significantly in the presence of the respective host plants. This host-plant-mediated assortative mating demonstrates that habitat isolation likely plays an important role in promoting reproductive isolation among populations of this host-specific gall former.

scholarly journals A test of sexual isolation in Drosophila

1966 ◽  
Vol 8 (2) ◽  
pp. 181-187 ◽  
Author(s):  
Forbes W. Robertson
Keyword(s):  
Assortative Mating ◽  
Sexual Isolation ◽  
Genetic Differences ◽  
Genetic Changes ◽  
Positive Assortative Mating ◽  
Selection For

1. A test is described for the development of sexual isolation between a wild and a derived population of D. melanogaster adapted to a new diet, containing EDTA. Other experiments had shown that adaptation to the new diet involved genetic changes in all chromosomes. Also fitness was reversed on the alternative diets under crowded competitive conditions.2. In three replicated trials flies from each population were used to establish paired cage populations, supplied with the medium to which each was adapted, and the pairs of cages were joined to allow restricted immigration between them. The experiment was run for about twenty-five generations.3. After fifteen and twenty-five generations, flies were collected from each cage to provide eggs which were cultured on the alternative diets to determine how far the members of pairs of populations differed from each other and from the foundation population. There were striking differences between the sub-populations and the parent populations, attributable to immigration between the former. Judged by the differences in performance between the sub-populations, genetic differences persisted but these were minor compared with the differences between the parent populations.4. Tests of preferential mating on the part of flies from paired sub-populations were entirely negative.5. Fourteen generations of selection for positive assortative mating failed to provide evidence of sexual isolation between the two basic populations, adapted to different diets.6. From these and other experiments it is inferred that sympatric divergence is improbable in a species like D. melanogaster.

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