After years of decline, many American cities are experiencing growth and renewal. In the first decades of the new century a host of U.S. cities saw increases in urban employment and population along with decreased rates of poverty and crime (McDonald, 2008). For the last three years data show American cities growing faster than their surrounding suburbs (Voith & Wachter, 2014).
Massachusetts Agricultural Experiment Station
Global climate change is altering the Earth's natural cycling of water from the ground to the air and back again, what is known as the hydrologic cycle. In New England, climate change is predicted to increase temperatures and increase the frequency and strength of rain events. The increased temperatures will result in less snow accumulation in the winter and an increased need for irrigation in the hotter summer as evapo-transpiration increases. This will alter significantly the recharge/extraction cycle. Will less water enter groundwater aquifers because of reduced snow fall?
Total wetland area in the U.S. has been in precipitous decline since the 1900's, and although recent decades have slowed the decline and advocated strongly for the services and economic benefits (not to mention ecological benefits!) these lands provide, still much more work needs to be done to preserve existing wetlands and promote restoration of impaired ones.
The safety of the food supply is a continuing issue for agriculture, with an estimated 81 million instances of food borne illnesses in the USA annually, with an estimated cost of $152 billion dollars per year to the US economy. The Center for Disease Control and prevention estimates that 46% of these illnesses were due to produce - thus food safety is very much an agricultural issue.
The red-backed salamander P. cinereus is an important component of forest ecosystems and, because they are widely distributed, occur at high densities, and are sensitive to environmental change and habitat disturbance/alteration, they are an ideal indicator species for assessing forest ecosystem health. However, the behavioral ecology of P.
Family forest owners (FFOs) control 263 million acres (or 35%) of U.S. forests. In the eastern U.S, FFOs control more than 50% of the forests (Butler, 2008). The average age of FFOs is over 60 years old. It is estimated that over 75% of family forest land is owned by people over the age of 55 and nearly 50% is owned by people over the age of 65 (Butler, et al. 2016). In the coming years, nearly 3.8 million FFOs will be deciding the future of their land. We are, in fact, in the midst of the largest intergenerational shift of land our country has ever experienced.
Invasive plants are species introduced from another region (non-native) that have established self-sustaining populations and are spreading, often with substantial negative consequences (Lockwood et al., 2007). Invasive species are a prominent component of global change (Vitousek et al., 1997, 1996), and have been identified as one of five major threats to ecosystems by the Millennium Ecosystem Assessment (along with, for example, climate change; MA, 2003).
Eastern white pine (Pinus strobus) is a crucial ecological and economic component of forests in the eastern U.S. and Canada. In the southeastern U.S., white pine is an especially critical associate of forests in the Appalachian Mountains as hemlock trees have been in decline due to the exotic hemlock woolly adelgid (Adelges tsugae).
Many bee pollinators are in decline, and exposure to diseases has been implicated as one of the potential causes Novel work in my lab found that consuming sunflower pollen dramatically reduced bumble bee infection by a gut pathogen. These are exciting results, but at this point we have established this effect only in the lab, with a single sunflower variety, one bumble bee species, and one pathogen species.
This proposal is about programmed cell death and sex determination in maize and the grass family. Programmed cell death is best defined as genetically encoded, actively controlled cellular suicide. Programmed cell death is of fundamental importance in plant development. For example, xylem cells undergo programmed cell death and create an interconnected network of hollow tubes essential for water transport.