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 20 of 55 for “"Intraspecific competition"”.
-
Intraspecific competition in Leucadendron xanthoconus (O.Knutze) K. Shun
… as regards intersexual and intrasexual competition. The Proteaceae genus Leucadendron is an example. In the Highlands State forest near Grabouw (Cape Province, South Africa) a number of Leucadendron xanthoconus populations exist. Here, an investigation for the detection of competition …
-
Drivers of eco-evolutionary dynamics in model systems - the role of harvest mortality and intraspecific competition
… I utilise model systems to explore the roles of competition and harvesting in regulating population growth, structure and phenotypic variation of individuals. As well as addressing broad theoretical questions of how individuals adapt to differing environmental pressures, and how such adaptation …
-
Variations in Plant Development Under Various Conditions of Interspecific and Intraspecific Competition in Grass-Legume Associations
Made available in DSpace on 2014-12-10T17:12:33Z (GMT). No. of bitstreams: 1 6808018.pdf: 5637949 bytes, checksum: b7572571a62b3f2291a80e678679909f (MD5) Previous issue date: 1967
-
An experimental approach to assess the role of nest predation in the population dynamics of the sociable weaver (Philetairus socius)
… compensatory or positive effect by reducing the intraspecific competition of a colony. The fourth aim was investigated by tracking the foraging paths of eight colonies of varying sizes, with foraging distance acting as a proxy for intraspecific competition. Colonies that were protected from snake …
-
Aspects of Lumbricus Terrestris L. dispersal, distribution and intraspecific interactions in field and laboratory investigations
… L. terrestris dispersal, distribution and intraspecific interactions through a number of laboratory and field experiments. Results demonstrated that population density can significantly affect dispersal in L. terrestris. Intraspecific competition for food resources and space in combination …
-
Effect of population density on diel activity and growth in stream-dwelling Arctic charr Salvelinus alpinus
Intraspecific competition plays a significant role in shaping how animals use and share habitats in space and time. However, the way individuals may modify their diel activity in response to increased competition has received limited attention. I used juvenile (age 1+) Arctic charr Salvelinus …
-
The ecology of venom use in the Javan Slow Loris (Nycticebus Javanicus) and its implications for conservation
… I examined the hypotheses that venom is used for intraspecific competition, predator defence and/or (ecto-) parasite avoidance. From April 2012 to June 2013 I observed 12 radio-collared and several uncollared wild Javan slow lorises (N. javanicus) at the rural agricultural field site Cipaganti in …
-
Competition and Community Interactions of Two Generalist Herbivores
<p>Competition can have far-reaching consequences for the fitness and distribution of many organisms. In herbivorous insects, competition mediated by a third organism is more common than direct competition and has a strong effect on insect communities; yet most research on indirect competition …
-
Stand dynamics, growth, and yield of genetically enhanced loblolly pine (Pinus taeda L.)
… diameter relationships and distributions, and intraspecific competition were investigated in second generation open-pollinated, controlled-pollinated, and clonal loblolly pine with an objective of characterizing the nature and magnitude of changes in these characteristics due to genetic …
-
Habitat Selection By Size Classes of Largemouth Bass
Habitat selection and intraspecific competition for habitats by size classes of largemouth bass (Micropterus salmoides) was studied in a manipulative experiment and with a radio-telemetry field study. Largemouth bass ("small" and "large") were studied in artificial pools with three equal-area …
-
Documentation of Missouri white-tailed deer chronoclines : implications for archaeology, paleoecology, and conservation biology
… ecological factors (e.g., Bergmann's rule, competition, food quality and quantity) can be responsible for changes in animal body size over time. White-tailed deer (Odocoileus virginianus) serve as an ideal candidate for studying these variables due to their importance today (to hunters and …
-
Occurrence and Impact of the Asian Fish Tapeworm Bothriocephalus acheilognathi in the Rio Grande (Rio Bravo del Norte)
… seasonal trends in tapeworm maturation and intraspecific competition. The second study assessed impacts of B. acheilognathi infection on condition and reproduction in C. lutrensis to make inferences about potential impacts on other endemic cyprinid species.
-
Occurrence and Impact of the Asian Fish Tapeworm Bothriocephalus acheilognathi in the Rio Grande (Rio Bravo del Norte)
… seasonal trends in tapeworm maturation and intraspecific competition. The second study assessed impacts of B. acheilognathi infection on condition and reproduction in C. lutrensis to make inferences about potential impacts on other endemic cyprinid species.
-
A paleozoological perspective on predator extermination and white-tailed deer (Odocoileus virginianus Boddaert) overabundance in central Texas.
… that a lack of predation likely has increased intraspecific competition for forage among deer resulting in smaller body size today. In fact modern deer from settings without harvest pressure are significantly smaller than those from harvested areas and from prehistoric deer. From a natural …
-
Food Size And Foraging Site Selection In A Breeding Population Of Red- Winged Blackbirds (Agelaius Phoeniceus)
… less often on the field than males. This reduces intraspecific competition and may increase feeding efficiency. It was postulated that there exist two levels of selection during nestling feeding: a selection for larger food items and for foraging sites. As female red-winged blackbirds feed the …
-
A quantitative model of density-dependent habitat selection: integrating isodar and isoleg theories
… calculated according to the Lotka-Volterra competition equations. Because fitness is assessed via growth rates, this model provides a more accurate representation of distribution patterns than do current models. The development of this model serves two purposes: (1) to permit the …
-
Size-structured competition and predation in red-eyed treefrog tadpoles
… size is important in determining the outcome of competition and predator-prey interactions. Size structure of a population (i.e. relative proportion of large and small conspecifics) may be particularly important in organisms with prolonged breeding periods and rapid growth where populations may …
-
Reproduction and early life history of a landlocked population of alewife (Alosa pseudoharencus) in Claytor Lake, Virginia
… in 1978 than in 1979, possibly due to reduced intraspecific competition for food and space following an alewife die-off in winter 1977-1978. Rapid growth of young-of-the-year alewives allowed the earliest spawned cohorts to become morphologically unavailable as prey to age 0 and age I sportfish …
-
Mechanisms facilitating coexistence between leopards (Panthera pardus) and their competitors in the Okavango Delta, Botswana
… largely resilient to the effects of intraguild competition. Specifically, I found little evidence that spatio-temporal niches were driven by predator avoidance and found limited impacts of competitor encounters on leopard behaviours and movements. In the context of intraspecific competition, my …
Page 1 of 3