Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 13 of 13 for “"reproductive value"”.
-
Weak information flow challenging reproductive management decision-making along the swine reproductive value chain: three manuscripts
… increasing scale, linkages across the value chain with retailers and processors, environmental obligations and new technologies. As a result, industry structure, markets for information and transaction governance have emphasized contracts, vertical coordination, improved sharing of …
-
Life history trade-offs in a parental care-providing fish: the role of reproductive value, predation threat, and physiological condition on brood abandonment decisions by paternal largemouth bass
Parental care evolved as a means to maximize reproductive success at a cost to physiological and nutritional condition of the care-providing individual, and at a cost to future reproductive potential. Parental investment decisions are rooted in tradeoffs between these factors, and when the cost of …
-
Effect of age on female choice in the field cricket, Gryllus interger
… less time left to reproduce, and their residual reproductive value decreases. This should correspond to a higher reproductive effort which may be represented as increased motivation and/or decreased selectivity. The effect of age on mate choice in Gryllus integer was investigated by using a …
-
Factors influencing the outcome of male-male encounters in the entomopathogenic nematode Steinernema spp.
… fights with new partners. Prior residency, reproductive value of or presence of a female didn’t have measurable effects on the occurrence of paralysis and death. A well-established culture of the symbiotic bacteria also enhanced fighting outcome. IJs experience a different developmental …
-
Broad reduction and adoption in ring-billed gulls (Larus Delaworensis): the potential for inergenerational conflict
… parents in 1987, to obtain an extra unit of reproductive fitness, while in 1988 parents were often unable to raise the entire brood and third chicks likely represented insurance reproductive value. Experimental broods (1988) were created in which hatch intervals were double those of natural …
-
Biological-physical interactions on Georges Bank : plankton transport and population dynamics of the ocean quahog, Arctica islandica
… from 1974 and 1991. Projection matrix eigenvalues were most sensitive to changes in adult and larval survival and planktonic duration. Lower wind models identified the NE Peak region as having the highest reproductive value and sensitivity. This work indicates that winter wind forcing is a …
-
Fitness Consequences of Clutch Size Decisions and Mate Change in Black Brant
… fitness. I studied the fitness consequences of reproductive effort (Chapter 2) and mate change (Chapters 3-5) in black brant geese (Branta bernicla nigricans, hereafter brant), an Arctic nesting goose species with precocial young. I used a 25 year (1990-2014) dataset collected at the Tutakoke …
-
An Evolutionary Perspective of Human Female Rape
… a number of constructs. namely: fertility value; victim-offender relationship; socio-economic status; rape proclivity; actual sexual aggression; and sociosexual orientation. There were two types of studies: studies 1-3 involved archival data, e.g. the use of criminal statistics. and studies …
-
Causes and consequences of sex ratio bias in Nazca boobies
… Galápagos has been the focus of long-term reproductive and demographic studies. The adult sex ratio at this colony has been significantly male biased for more than twenty years. Knowledge of the ontogeny of this bias provides critical context that allows proper framing of hypotheses …
-
The population biology of Ligia oceanica (L.)(Crustacea: Oniscoidea)
… and schedules of survivorship, fecundity and reproductive value are calculated. Although the supralittoral zone of rocky shores is generally regarded as a severe and stressful habitat, the dynamics of the population exhibit only minor differences between years, and no direct influence of wave …
-
Breeding Biology Of Chuck-Will's-Widows: Incubation, Brooding, And Provisioning Behavior And Characteristics Of Nest Sites
… attentiveness may be related to the increased reproductive value of eggs as the incubation period progresses. Both males and females provisioned young, with eight observed visits by males and three by females. At dusk, feeding rates were highest (P = 0.0026) during the hour immediately after …
-
A model-based test of the efficacy of a simple rule for predicting adaptive sex allocation
The division of resources between male and female reproductive function is defined as sex allocation. The usefulness of simple rules to predict adaptive sex-allocation decisions has been a contentious topic. Simple rules are difficult to apply when the biological details of the life cycle are …
-
Fitness and Implications of Reproductive Decisions for Black Brant Nesting on the Yukon-Kuskokwim Delta, Alaska
… through reduced survival or reduced future reproductive investment. In the second chapter, human harvest of male brant was used as an experiment to examine effects of mate loss on fitness of female brant. Nineteen years of recapture/resighting and nesting data were used from 2338 marked …