Global ETD Search

1	Relative contributions of food and temperature to annual reproductive success in two tree swallow (Tachycineta bicolour) populations over 35 years LeClair, Dayna 05 December 2012 (has links) Understanding how environmental variation affects fitness and population dynamics is a central goal in modern population biology. Using a multilevel path model, I simultaneously examined the effects of food and temperature on multiple stages of the breeding cycle, and their relative contribution to annual variation in reproductive success in two tree swallow (Tachycineta bicolor) populations over the same 35 year period. In one population where food abundance peaked during the laying and incubation portion of the breeding season, the primary driver of annual reproductive success was laying period food abundance, which directly influenced clutch size and the proportion of eggs hatched. In the second population, food was relatively low during the first half of the breeding season, and the primary driver of annual reproductive success was temperature during the nestling period, which directly influenced nestling survival. My results show that understanding the factors that influence reproductive performance requires linking environmental variables to reproductive events throughout the entire breeding period and clearly demonstrate how climate change can have opposite effects on two populations less than 35 km apart temperature reproductive success tree swallow Tachycineta bicolor food abundance
2	Food Insecurity and Obesity in Low-Income Women: The Monthly Cycle of Food Abundance and Food Shortage Ye, Qian 21 March 2011 (has links) No description available. Nutrition Public Health food insecurity obesity monthly cycle food abundance food shortage household food inventory dietary intake food stamp program disordered eating NHANES
3	Saline and Organic Water Pollution Bohn, Hinrich L., Johnson, Gordon V. 06 May 1972 (has links) From the Proceedings of the 1972 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - May 5-6, 1972, Prescott, Arizona / Better use and recycling of fresh water, which often recharges the oceans, would reduce man's disruption of nature to increase his supply of potable water. The global distribution of water, desalination, water reclamation and recycling, the roles of soils and plants in recycling and urban misuse of water are discussed. Man can increase his supply of food and good fresh water by recycling and nutrient balance, which imply living off his wastes. Intimate involvement of soils and plants in the production of fresh water and food is clear. Soils and plants should be equally involved in converting our waste water into potable water and useful nutrients. Numerous examples of how this may be done and how it is being done are presented. Hydrology -- Arizona. Water resources development -- Arizona. Hydrology -- Southwestern states. Water pollution Saline water Organic matter Water utilization Recycling Freshwater Recharge Oceans Reclamation Desalination Food abundance Water supply Nutrients Wastes Soils Plants Treatment

1

Page generated in 0.0774 seconds