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.
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Showing 1 to 11 of 11 for “"Sex allocation"”.
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Sex Allocation in the Caribbean Coral, <em>Porites astreoides</em> (Lamarck)
… organisms, but may also be advantageous because allocation to male and female function can be manipulated to maximize fitness when energy availability limits reproduction. Sex allocation theory has been primarily developed in plants, but may be applicable to other sessile organisms that are …
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A model-based test of the efficacy of a simple rule for predicting adaptive sex allocation
… 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 complex, as is the case in many …
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Sex Ratios and the City: Is parental corticosterone a mediator of the relationship between urbanization and offspring sex allocation?
… states that mothers can adjust their offspring sex ratios according to their own condition and the environmental conditions they face during breeding. Past tests of this hypothesis in avian species have focused on how natural variation shapes sex allocation trade-offs. However, urbanization also …
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Immunocompetence, testosterone and breeding success in red bishop (Euplectes orix)
… hypothesis', 'compatible-genes hypothesis, and 'sex-allocation theory'), and with respect to possible influences of environmental factors on the immune system.
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PATERNAL ATTRACTIVENESS AND PARENTAL INVESTMENT STRATEGIES IN SONG SPARROWS MELOSPIZA MELODIA
… affects female mating tactics, offspring sex allocation, offspring growth rates and parental feeding rates in a wild population of song sparrows (Melospiza melodia melodia). Male song complexity appeared to affect female mating tactics, as males that had smaller song repertoires lost …
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Examining skewed sex ratio in the mountain plover (Charadrius montanus) population
Skewed sex ratios can have negative implications for population growth or persistence if not congruous for a species system. A skewed tertiary sex ratio (2.3 males per female) has been detected in the breeding population of a grassland shorebird experiencing population declines, the mountain plover …
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Examining skewed sex ratio in the mountain plover (Charadrius montanus) population
Skewed sex ratios can have negative implications for population growth or persistence if not congruous for a species system. A skewed tertiary sex ratio (2.3 males per female) has been detected in the breeding population of a grassland shorebird experiencing population declines, the mountain plover …
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Causes and consequences of sex ratio bias in Nazca boobies
… 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 regarding parental sex allocation, the relative …
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Local Variation in the Chemical Defence of European Pine Sawfly (Neodiprion sertifer): Effects of Host Tree Chemistry and Social Environment
… and female oviposition decisions (group size and sex allocation). Additionally, I analysed how the social environment (group size and sex ratio) correlates with larval defensive traits. To study these, I measured the effect of host plant’s chemical concentration on larval chemical defence traits …
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Variation in breeding systems and consequences for reproductive traits in Erica
… pollination syndromes very well. Presumably, sex allocation theory may explain the relationship of breeding system with P/O ratios better. Histological studies of pollen tube growth for self- and cross-pollinated flowers of eight species suggested that Erica has late acting …
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Strategies of Sexual Reproduction in Aphids
… um Ressourcen.Während sich die Mütter der sexuellen Generation von U. cirsii von Nymphen zu Adulten entwickeln, haben Unterschiede in der Populationsdichte keinen Effekt mehr auf das Geschlechter-Verhältnis ihres Nachwuchses. Ein Effekt der Populationsdichte während der Entwicklung der …