Humans have long sought to understand the forces that shape the diversity of living creatures on our planet. This work is primarily concerned with examining one such force---the historical action of natural selection---from practical, philosophical, and pedagogical perspectives.…
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This master thesis addresses a large-scale biogeographical question, the distribution and evolutionary history of a marine species complex with a vast distribution in the northern hemisphere. This complex includes two intertidal brown macroalgae, Fucus spiralis and Fucus guiryi,…
Nos últimos anos, houve uma evolução clara nos fornecedores da indústria automotiva, a qual se deve às constantes exigências impostas pelas OEMs (Fabricantes de Equipamentos Originais). É exigido um nível de qualidade bastante elevado, com uma competitividade dos produtos cada v…
Across most of North America, white-tailed deer ( Odocoileus virginianus ) populations are increasingly overabundant and the widespread impacts of their herbivory are having important ecological and economic repercussions. The cascading consequences of white-tailed deer overabun…
Clean and safe drinking water is a human right. Global, federal, and state agencies that monitor the source and quality of drinking water are limited in power and oversight. Historically, human groups have replaced wetland habitat with cropland, disregarding the abundance of res…
Global patterns of biodiversity intrigue biologists to investigate their origins and common mechanisms and causes underlying the patterns through studies of evolutionary histories, processes, drivers that might have shaped the patterns of species diversification. The eastern Asi…
Agriculture is a major driver of global environmental change. Restorative practices like agroforestry, that integrate native and non-native, culturally important plants while mimicking the structure and function of native forests have the potential to increase biodiversity and e…
Medicinal plants were selected on the basis of their use by Berber and Arab people to treat infectious diseases caused by viruses and microbes, as determined in interviews with 55 healers and herbalists of all regions of Morocco. Plants used traditionally to treat colds, flu, co…
Callus induction in Origanum species . The present study was undertaken to determine the explant and media for callus induction of Origanum hirtum and O. onites . The explants (leaf-base, nodal, stem, cotyledon, hypocotyl, and root segments) were cultured onto Gamborg's B5 or Mu…
Many tree species reproduce in episodic, yet synchronous events. This phenomenon, mast-fruiting, has been investigated mainly in temperate forests, and several hypotheses have been proposed for its evolutionary origin and maintenance. To understand the possible adaptive signific…
Effects of dwarfing and semi-dwarfing rootstocks on apple yield, fruit drop, fruit weight, fruit length, fruit diameter, Brix, juice pH, leaf area, transpiration, photosynthesis, shoot water potential before dawn and at noon, and scion cultivar and rootstock diameters were evalu…
Phytophthora capsici is the cause of Phytophthora root rot disease in pepper. In this study, a set of 34 P. capsici isolates from California, New Mexico, North Carolina, and Turkey were screened against a set of 11 pepper varieties for virulence. These same isolates were also ch…
The recirculation of nutrient runoff was investigated in a container nursery using a computerized injector, and the impact of recirculation on growth of seven woody species was compared against traditional non-recirculated fertilizers. Recirculation had no adverse affect on grow…
Quercus wislizenii and Q. parvula are evergreen oaks of California. The latter was recognized as a species distinct from Q. wislizenii only recently, but has not received full acceptance. In an attempt to study differentiation between these two taxa and the genetic architecture …
Slow establishment and poor herbage yield in the seeding year limit the use of cultivated perennial C\sb4 forage grasses in the Ethiopian highlands. Adding legumes could improve total herbage yield and forage quality of grass pastures. The yield and quality of three annual legum…
Leaf samples were collected from various research and commercial mango (Mangifera indica L.) farms from south and western regions of Puerto Rico. The purpose of this study was to isolate, identified and characterized the species of Colletotrichum spp. associated with typical ant…
In most plant communities, neighbours are likely to interact in at least two ways—negatively through competition and positively by facilitation. However, typically only the end product of these interactions is measured thereby detecting only the outcome, not the interactions the…
The inheritance of the primocane (fall)-fruiting (PF) characteristic was studied in seedling populations of tetraploid blackberry. Four selections (A-1836, A-593, A-830, and A-1680) and two cultivars (Arapaho and Shawnee) were used as parents in a full diallel crossing scheme. C…
The objective of this research was to express a fungal phytase gene in transgenic soybean cells to to study the potential for improving phosphorus utilization in soybean meal. A simple and inexpensive particle inflow gene gun was constructed and bombardment was optimized as assa…