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 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 Gut microbiomes and reproductive isolation in Drosophila

2017 ◽  
Vol 114 (48) ◽  
pp. 12767-12772 ◽  
Author(s):  
Philip T. Leftwich ◽  
Naomi V. E. Clarke ◽  
Matthew I. Hutchings ◽  
Tracey Chapman
Keyword(s):  
Reproductive Isolation ◽  
Assortative Mating ◽  
Gut Microbiome ◽  
Experimental Studies ◽  
Gut Bacteria ◽  
Evolutionary Significance ◽  
Direct Role ◽  
General Role ◽  
Positive Assortative Mating

Experimental studies of the evolution of reproductive isolation (RI) in real time are a powerful way in which to reveal fundamental, early processes that initiate divergence. In a classic speciation experiment, populations of Drosophila pseudoobscura were subjected to divergent dietary selection and evolved significant positive assortative mating by diet. More recently, a direct role for the gut microbiome in determining this type of RI in Drosophila melanogaster has been proposed. Manipulation of the diet, and hence the gut microbiome, was reported to result in immediate assortative mating by diet, which could be eliminated by reducing gut microbes using antibiotics and recreated by adding back Lactobacillus plantarum. We suggest that the evolutionary significance of this result is unclear. For example, in D. melanogaster, the microbiome is reported as flexible and largely environmentally determined. Therefore, microbiome-mediated RI would be transient and would break down under dietary variation. In the absence of evolutionary coassociation or recurrent exposure between host and microbiome, there are no advantages for the gut bacteria or host in effecting RI. To explore these puzzling effects and their mechanisms further, we repeated the tests for RI associated with diet-specific gut microbiomes in D. melanogaster. Despite observing replicable differences in the gut microbiomes of flies maintained on different diets, we found no evidence for diet-associated RI, for any role of gut bacteria, or for L. plantarum specifically. The results suggest that there is no general role for gut bacteria in driving the evolution of RI in this species and resolve an evolutionary riddle.

scholarly journals Mosquito Vector Production across Socio-Economic Divides in Baton Rouge, Louisiana

2021 ◽  
Vol 18 (4) ◽  
pp. 1420
Author(s):  
Rebeca de Jesús Crespo ◽  
Madison Harrison ◽  
Rachel Rogers ◽  
Randy Vaeth
Keyword(s):  
Low Income ◽  
Baton Rouge ◽  
Habitat Preferences ◽  
Abundant Species ◽  
Mosquito Larvae ◽  
Mosquito Vector ◽  
Mosquito Vectors ◽  
Low Income Groups ◽  
Socio Economic Factors

We investigated the role of socio-economic factors in the proliferation of mosquito vectors in two adjacent but socio-economically contrasting neighborhoods in Baton Rouge, LA, USA. We surveyed mosquito larvae habitat, mosquito larvae, and adult mosquitoes during the summer of 2020. We also evaluated the number of requests for mosquito abatement services in the years preceding the study for each area. While we did not find differences in terms of the most abundant species, Culex quinquefasicatus (F1,30 = 0.329, p = 0.57), we did find a higher abundance of mosquito habitats, particularly discarded tires, as well as larvae (z = 13.83, p < 0.001) and adults (F1,30 = 4.207, p = 0.049) of the species Aedes albopictus in the low-income neighborhood. In contrast, mosquito abatement requests were significantly higher in the high socio-economic neighborhood (z = −8.561, p < 0.001). This study shows how factors such as adjudicated properties, discarded tires and pest abatement requests can influence the abundance of mosquito vectors, disproportionately affecting low-income groups. This study also highlights how Aedes spp. may be better indicators than Culex spp. of socio-economic differences between nearby neighborhoods, due to their short flight range and habitat preferences, and this should be considered in future studies attempting to detect such disparities in the future.

Individual and Community: The Changing Role of Megaliths in the Orcadian Neolithic

1985 ◽  
Vol 51 (1) ◽  
pp. 59-74 ◽  
Author(s):  
Niall Sharples
Keyword(s):  
The Other ◽  
Significant Problem ◽  
Neolithic Period ◽  
Size Type ◽  
The Individual ◽  
Changing Role

This paper is an exploration of the chronological development of a series of elaborate and architecturally distinctive chambered tombs on the Islands of Orkney. It begins with a short critique of the present views of the Orcadian Neolithic and highlights a failure to understand chronological developments as the most significant problem. Thus after a brief classification of the monuments there is a detailed discussion of the chronological evidence which consciously avoids typological assumptions. This is followed by an examination of the various uses the tombs were put to and involves an assessment of the location and architectural visibility of the monuments and the remains found in the chamber. When combined with the chronological evidence a series of changes in monument size, type, location and use can be hypothesized for the neolithic period. This culminates in a shift away from burial monuments to physically defined spaces, presumably used for ceremonial purposes. These changes can be interpreted as deliberate manipulation by groups within that society to change the ideological concepts which defined the role of the individual in relation to the other members of the society.

The Role of Personality and Intelligence in Assortative Mating

2012 ◽  
Vol 15 (2) ◽  
pp. 680-687 ◽  
Author(s):  
Sergio Escorial ◽  
Carmen Martín-Buro
Keyword(s):  
Socioeconomic Status ◽  
Empirical Evidence ◽  
Assortative Mating ◽  
Big Five ◽  
Educational Level ◽  
Big Five Model ◽  
Two Measures ◽  
Effect Of Age

Assortative mating is the individuals' tendency to mate with those who are similar to them in some variables, at a higher rate than would be expected from random. This study aims to provide empirical evidence of assortative mating through the Big Five model of personality and two measures of intelligence using Spanish samples. The sample consisted of 244 Spanish couples. It was divided into two groups according to relationship time. The effect of age, educational level and socioeconomic status was controlled. The results showed strong assortative mating for intelligence and moderate for personality. The strongest correlations for Personality were found in Openness, Agreeableness and Conscientiousness.

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.

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