Isotopic ecology of coyotes from scat and road kill carcasses: A complementary approach to feeding experiments.

Scat is frequently used to study animal diets because it is easy to find and collect, but one concern is that gross fecal analysis (GFA) techniques exaggerate the importance of small-bodied prey to mammalian mesopredator diets. To capitalize on the benefits of scat, we suggest the analysis of scat carbon and nitrogen isotope values (δ13C and δ15N). This technique offers researchers a non-invasive method to gather short-term dietary information. We conducted three interrelated studies to validate the use of isotopic values from coyote scat: 1) we determined tissue-to-tissue apparent C and N isotope enrichment factors (ε13* and ε15*) for coyotes from road kill animals (n = 4); 2) we derived diet-to-scat isotope discrimination factors for coyotes; and 3) we used field collected coyote scats (n = 12) to compare estimates of coyote dietary proportions from stable isotope mixing models with estimates from two GFA techniques. Scat consistently had the lowest δ13C and δ15N values among the tissues sampled. We derived a diet-to-scat Δ13C value of -1.5‰ ± 1.6‰ and Δ15N value of 2.3‰ ± 1.3‰ for coyotes. Coyote scat δ13C and δ15N values adjusted for discrimination consistently plot within the isotopic mixing space created by known dietary items. In comparison with GFA results, we found that mixing model estimates of coyote dietary proportions de-emphasize the importance of small-bodied prey. Coyote scat δ13C and δ15N values therefore offer a relatively quick and non-invasive way to gain accurate dietary information

The Impact of Income Growth and Provision of Health-Care Services on Child Nutrition in Vietnam

Vietnam enjoyed rapid economic growth and a sharp reduction in child stunting in the 1990s. Economic growth can increase children's nutritional status in two ways. First, by raising household incomes, which can be used it to purchase more food, medicine and medical services. Second, by raising government revenue, which can be used to improve publicly provided medical services. This paper estimates the impact of household per capita expenditures on children's nutritional status. All the estimation methods used indicate that household income growth explains at best only part of the decrease in child stunting. The paper also examines what aspects of public and private medical services improveme child health.child nutrition and health, economic growth

A Hot Channel

This paper studies on-chip communication with non-ideal heat sinks. A channel model is proposed where the variance of the additive noise depends on the weighted sum of the past channel input powers. It is shown that, depending on the weights, the capacity can be either bounded or unbounded in the input power. A necessary condition and a sufficient condition for the capacity to be bounded are presented.Comment: to be presented at 2007 IEEE Information Theory Workshop (ITW), replaced with version that will appear in the proceeding

Child nutrition, economic growth, and the provision of health care services in Vietnam in the 1990s

Vietnam's rapid economic growth in the 1990s greatly increased the incomes of Vietnamese households, which led to a dramatic decline in poverty. Over the same period, child malnutrition rates in Vietnam, as measured by low height for age in children under 5, fell from 50 percent in 1992-93 to 34 percent in 1997-98. Disparities exist, however, between different regions, urban and rural areas, ethnicities, and income quintiles. This dramatic improvement in child nutrition during a time of high economic growth suggests that the nutritional improvements are due to higher household incomes. The authors investigate whether this causal hypothesis is true by estimating the impact of household income growth on children's nutritional status in Vietnam. Different estimation methods applied to the 1992-93 and 1997-98 Vietnam Living Standards Survey data find that growth in household expenditures accounts for only a small proportion of the improvements in children's nutritional status. The authors use data on local health facilities to investigate the role that they may have played in raising children's nutritional status in Vietnam.Public Health Promotion,Health Systems Development&Reform,Early Child and Children's Health,Health Monitoring&Evaluation,Housing&Human Habitats,Early Child and Children's Health,Street Children,Youth and Governance,Poverty Lines,Health Monitoring&Evaluation

CHILD NUTRITION AND ECONOMIC GROWTH IN VIETNAM IN THE 1990S

Child malnutrition is pervasive in almost every developing country. Economic growth can lead to better child nutrition, but the size and nature of this effect can vary widely across countries. This first part of this paper examines the impact of increased household income on children's nutritional status on Vietnam, a country with a high rate of economic growth in the 1990s. It finds that increases in household incomes lead to statistically significant improvements in children's nutritional status, but the size of this effect explains only a small proportion of the reduction in child malnutrition in Vietnam in the 1990s. This suggests that something else occurred in Vietnam during those years that reduced child malnutrition. A preliminary analysis of data on health services in rural areas suggests that specific types of services, particularly equipment for measuring and monitoring child growth, lead to improved child nutrition.Food Consumption/Nutrition/Food Safety,