Reproductive isolation between Urophora affinis and U. quadrifasciata (Diptera: Tephritidae) in British Columbia

1983 ◽  
Vol 61 (4) ◽  
pp. 787-791 ◽  
Author(s):  
D. E. Berube ◽  
Judith H. Myers
Keyword(s):  
British Columbia ◽  
Mate Selection ◽  
Reproductive Strategies ◽  
Species Recognition ◽  
Theoretical Models ◽  
Behavioral Differences ◽  
Centaurea Diffusa ◽  
Males And Females ◽  
Free Ranging ◽  
Selection Of

Observations were made of the reproductive behavior of free-ranging Urophora affinis and U. quadrifasciata on their host plant, Centaurea diffusa, near Kamloops, British Columbia. The behavior of both species is similar. Courting males of both species do not distinguish between conspecific males and females until attempted copulation. Males do discriminate between conspecific and non-conspecific females. Species recognition by males occurs at the time of prospective mate selection of during precopulatory displays. Recognition is apparently based on morphological and subtle behavioral differences between the two species. Some males did attempt copulation with non-conspecific females, and these were consistently rejected by the females. Differences in the male genitalia are probably important in female recognition of males. The behavior of these two species is discussed in relation to theoretical models of the evolution of reproductive strategies.

Habitat selection by the Puerto Rican yellow-chinned anole, Anolis gundlachi

2005 ◽  
Vol 83 (7) ◽  
pp. 983-988 ◽  
Author(s):  
Javier A Rodríguez-Robles ◽  
Manuel Leal ◽  
Jonathan B Losos
Keyword(s):  
Habitat Selection ◽  
Habitat Use ◽  
Puerto Rican ◽  
Visual Cues ◽  
Evolutionary Dynamics ◽  
Males And Females ◽  
Selection For ◽  
Free Ranging ◽  
Woody Substrates ◽  
Selection Of

Habitat selection can directly affect the fitness of an individual and the evolutionary dynamics of the population to which that organism belongs. We studied habitat use of the Puerto Rican yellow-chinned anole (Anolis gundlachi Peters, 1876) to examine whether this arboreal lizard uses its environment in a nonrandom manner. Males and females preferred woody vegetation substrates over nonwoody plants and sierra palms (Prestoea acuminata var. montana (Graham) A. Henderson and G. Galeano) as perching sites, and they also selected wider vegetation than what was randomly available. Selection for minimizing conspicuousness to potential predators and for increased locomotion capacity may help explain the preference for woody substrates and broader surfaces, respectively. Anolis gundlachi relies almost exclusively on visual cues for foraging and social interactions, and using wider perches also increases an individual's ability to scan a larger proportion of its territory. Our findings thus indicate that the nonrandom habitat use of free-ranging A. gundlachi leads to the selection of perching substrates that may increase performance of ecologically relevant capabilities.

scholarly journals Mating system modulates mate selection in aphidophagous ladybird, Menochilus sexmaculatus

2020 ◽  
Author(s):  
Swati Saxena ◽  
Geetanjali Mishra ◽  
Omkar
Keyword(s):  
Mate Choice ◽  
Mating System ◽  
Mate Selection ◽  
Mating Systems ◽  
Multiple Mating ◽  
Female Mate Choice ◽  
Egg Viability ◽  
Males And Females ◽  
Male Mate ◽  
Selection Of

ABSTRACTMate competition and selection of mates is strongly influenced by the organism’s mating system. Monogamous matings provide more benefits as compared to polygamous matings. However, it has been proven that in polygamous systems, females gain benefits from the males, therefore indulging in multiple mating, leading males to access maximum females. In zigzag ladybird, Menochilus sexmaculatus, mate choice has been studied on several pre-and postcopulatory factors. However, mate choice as a function of mating system is still remains untouched. In the present study, we hypothesised that the mating system modulates mate selection of beetles. Adults were held in different mating systems and then males and females were tested in mate choice trials. Polygynous males were more preferred over monogynous males. However, males preferred monandrous females over polyandrous females. In a second experiment, we also included relatedness as additional factor. In female mate choice trials, females preferred unrelated monogynous males which were earlier rejected over related polygynous and in male mate choice trials, males preferred unrelated polyandrous females over related monandrous females. The results were not confined only to mate choice but significant effect was also observed on time to commence mating, copulation duration, fecundity and percent egg viability.

scholarly journals Selection of Agricultural Foods by Eastern Grey Squirrels (Sciurus carolinensis): Implications for a New Introduction in British Columbia

2016 ◽  
Vol 130 (3) ◽  
pp. 202
Author(s):  
Jillian M McAllister ◽  
Valerie Law ◽  
Karl W Larsen
Keyword(s):  
British Columbia ◽  
Local Scale ◽  
Sciurus Carolinensis ◽  
Grey Squirrel ◽  
Food Items ◽  
South Central ◽  
Fruit Growing ◽  
Free Ranging ◽  
Grey Squirrels ◽  
Selection Of

The recent introduction of the Eastern Grey Squirrel (Sciurus carolinensis) into south-central British Columbia occurred within an important agricultural zone. As repercussions for the fruit-growing sector are currently unknown, we conducted trials with captive squirrels to understand the range of fruits consumed and their references. The squirrels consumed a portion of every food item offered, although the order in which the foods were used was inconsistent (with sharp contrasts between animals). Of the fruit types offered, apples appeared to be of greatest overall interest. However, seeds and nuts tended to be used first when presented in combination with fruit, suggesting opportunities to use these food types to deflect or remove Eastern Grey Squirrels from orchard crops. We caution that our results may not reflect the food items that free-ranging Eastern Grey Squirrels will target or disregard once densities in the introduced population become higher and the availability of food on a local scale begins to exert an effect.

Diagnostic approach to causes of spinal pain

2018 ◽  
pp. 66-70
Author(s):  
F. D. Nasirova
Keyword(s):  
Spinal Pain ◽  
Rapid Loss ◽  
Loss Of Weight ◽  
History Of ◽  
Radiologic Investigation ◽  
Males And Females ◽  
Serious Disease ◽  
Pain At Rest ◽  
Oncologic Diseases ◽  
Selection Of

Causes of spinal pain are extremely varying. Sex composition of patients referring with spinal pain at the age of 16 to 35 was 35% and 65% for males and females, respectively. Peak number of complaints was observed in 30-40 years age group of highest work ability. The followings should be considered as precautions in spinal pain: onset of pain at the age of 20 and after 50, family history of oncologic diseases, walking disorders or dysfunctions of sphincters, numbness in extremities, general malaise and rapid loss of weight, pain at rest and primarily at night, as these conditions may be a warning of underlying serious disease. Selection of algorithm for radiologic investigation is decided by the treating physician.

scholarly journals We’re Not That Choosy: Emerging Evidence of a Progression Bias in Romantic Relationships

2021 ◽  
pp. 108886832110258
Author(s):  
Samantha Joel ◽  
Geoff MacDonald
Keyword(s):  
Romantic Relationships ◽  
Mate Selection ◽  
Theoretical Models ◽  
Romantic Partners ◽  
Test Phase ◽  
Relationship Development ◽  
Cultural Narrative ◽  
Relationship Initiation ◽  
Relationship Decisions

Dating is widely thought of as a test phase for romantic relationships, during which new romantic partners carefully evaluate each other for long-term fit. However, this cultural narrative assumes that people are well equipped to reject poorly suited partners. In this article, we argue that humans are biased toward pro-relationship decisions—decisions that favor the initiation, advancement, and maintenance of romantic relationships. We first review evidence for a progression bias in the context of relationship initiation, investment, and breakup decisions. We next consider possible theoretical underpinnings—both evolutionary and cultural—that may explain why getting into a relationship is often easier than getting out of one, and why being in a less desirable relationship is often preferred over being in no relationship at all. We discuss potential boundary conditions that the phenomenon may have, as well as its implications for existing theoretical models of mate selection and relationship development.

scholarly journals A Clinical Study to Correlate the Facial Form and Maxillary Central Incisor Tooth Form in Males and Females of Davangere Population

2016 ◽  
Vol 04 (03) ◽  
pp. 156-164
Author(s):  
Deepak Bansal ◽  
Shruti Sharma ◽  
Manjit Kumar ◽  
Amrit Khosla
Keyword(s):  
Facial Appearance ◽  
Central Incisor ◽  
Incisor Tooth ◽  
Maxillary Central Incisor ◽  
Anterior Teeth ◽  
The Face ◽  
Tooth Form ◽  
Males And Females ◽  
Selection Of ◽  
Made In

AbstractAn altered facial appearance is more difficult to face, than problems related to ill-fitting denture or eating. The selection of maxillary anterior teeth for complete denture has long posed problem in clinical practice and a controversy about the best method to employ still exists. An attempt is made in the present study to clinically correlate the face form with maxillary central incisor tooth form in males and females of Davangere population. In 1914, Leon William's projected the “the form method” where he classified facial forms as square, tapering, and ovoid. Maxillary central incisors were selected according to the facial forms.Of total 100 subjects four different tooth forms and face forms were evaluated. They are: square, ovoid, square-tapered, tapered. No significant correlation existed between face form in male and females. Females exhibited greater correlation between face forms and inverted tooth form but that correlation is not sufficient to serve as a guide for selection of anterior teeth.

World Englishes, Pragmatics, and Discourse

2015 ◽  
Author(s):  
Yamuna Kachru
Keyword(s):  
Speech Acts ◽  
Theoretical Models ◽  
Cross Cultural ◽  
World Englishes ◽  
Cultural Communication ◽  
Conversational Speech ◽  
Cross Cultural Communication ◽  
Unique Site ◽  
Selection Of

The central role of English in cross-cultural communication worldwide has made it a unique site for understanding diversity in systems of discourse pragmatics. In contact situations, these differences can help to refine theoretical models, such as the question of how universal speech acts or properties of facework and politeness are. They can also have significant real-world implications in the form of cross-cultural (mis-) communication in globalized contexts. This chapter reviews a selection of examples of speech acts and politeness in World Englishes contexts that use theoretical models to account for variation, but in some instances also challenge elements of such models. The discussion also includes a consideration of variation in surface form as well as variation in discourse other than conversational speech, such as written genres.

scholarly journals Rapid sex-specific adaptation to high temperature in Drosophila

eLife ◽  
2020 ◽  
Vol 9 ◽  
Author(s):  
Sheng-Kai Hsu ◽  
Ana Marija Jakšić ◽  
Viola Nolte ◽  
Manolis Lirakis ◽  
Robert Kofler ◽  
...  
Keyword(s):  
Reproductive Strategies ◽  
Adaptive Strategies ◽  
Selection Response ◽  
Functional Requirements ◽  
Natural Habitats ◽  
Medical Treatments ◽  
Specific Adaptation ◽  
Males And Females ◽  
The Impact ◽  
New Mutations

The pervasive occurrence of sexual dimorphism demonstrates different adaptive strategies of males and females. While different reproductive strategies of the two sexes are well-characterized, very little is known about differential functional requirements of males and females in their natural habitats. Here, we study the impact environmental change on the selection response in both sexes. Exposing replicated Drosophila populations to a novel temperature regime, we demonstrate sex-specific changes in gene expression, metabolic and behavioral phenotypes in less than 100 generations. This indicates not only different functional requirements of both sexes in the new environment but also rapid sex-specific adaptation. Supported by computer simulations we propose that altered sex-biased gene regulation from standing genetic variation, rather than new mutations, is the driver of rapid sex-specific adaptation. Our discovery of environmentally driven divergent functional requirements of males and females has important implications-possibly even for gender aware medical treatments.

Webb, Phyllis (1927– )

2018 ◽  
Author(s):  
Melissa Dalgleish
Keyword(s):  
British Columbia ◽  
West Coast ◽  
Full Length ◽  
The West ◽  
University Of British Columbia ◽  
Mcgill University ◽  
Phyllis Webb ◽  
The University ◽  
Point Of Departure ◽  
Selection Of

Phyllis Webb, OC is a Canadian poet, teacher, and broadcaster. She was born in Victoria, British Columbia and attended the University of British Columbia and McGill University. She is the author of numerous books of poetry, a selection of prose, and a collection of broadcast scripts, essays and reviews published as Talking (1982). Her first collection of poems was published alongside work by Eli Mandel and Gael Turnbull in Trio (1954). Webb’s first full-length collection, Even Your Right Eye (1956) was followed by The Sea is Also a Garden (1962). She began working at CBC Toronto in 1964 and acted as the producer of the ‘Ideas’ programme from 1967–1969. Her 1965 collection Naked Poems marked a point of departure with its compact forms and erotic evocation of lesbian desire. After returning to the West Coast, Webb did not publish another full-length collection until Wilson’s Bowl (1980). She won the Governor General’s Award for The Vision Tree (1982). Webb’s interest in the Persian ghazal form inspired Sunday Water: Thirteen Anti-Ghazals (1982) and Water and Light: Ghazals and Anti-Ghazals (1984). Her consistent concern with form manifests itself in her formal experimentation and her meticulous crafting of poems.

scholarly journals Morphology and Timing of Spawning of Umatilla Dace (Rhinichthys umatilla) in the Slocan River, British Columbia

2016 ◽  
Vol 130 (3) ◽  
pp. 224
Author(s):  
Louise Porto ◽  
Crystal Lawrence
Keyword(s):  
British Columbia ◽  
Aquatic Macrophytes ◽  
Columbia River Basin ◽  
Terrestrial Vegetation ◽  
Spawning Period ◽  
Habitat Features ◽  
In The Wild ◽  
Males And Females ◽  
First Time ◽  
Timing Of Spawning

Umatilla Dace (Rhinichthys umatilla, Cyprinidae) are endemic to the Columbia River Basin. In Canada, this species is assessed as “threatened”. Little is known about its life history, especially with respect to spawning in the wild. A total of 688 specimens were captured, including 39 mature males and females displaying spawning colouration and tubercles, during minnow trapping and electrofishing surveys conducted on the Slocan River in southern British Columbia, Canada. Fertilized eggs were not observed, but eggs and milt were expressed from ripe individuals. Spawning was estimated to occur from mid-July to mid-September. Aquatic macrophytes and flooded terrestrial vegetation were important habitat features for mature Umatilla Dace leading up to the spawning period on the Slocan River. To our knowledge this is the first time that Umatilla Dace have been captured in spawning condition and observed with spawning colouration and tubercles in the wild in Canada. Results of this study will aid the development of recovery plans and management for this species in British Columbia.

Sign in / Sign up

Export Citation Format

Share Document