The Vegetation of Stinson Prairie, Kossuth County, Iowa

Stinson Prairie, a 12.5 ha native preserve, is a rich grassland exhibiting the full range of prairie vegetation. Situated on a rolling moraine, topographic differences produce four main vegetation types: dry prairie, mesic prairie, swales and pothholes. Species richness is highest in the mesic prairie and lowest in the swales and pothholes. Stinson Prairie, although small, is well preserved, and compared to Kalsow Prairie (mesic) and Sheeder Prairie (dry), shows a well-developed vegetation gradient. Cypripedium candidum, an orchid rare in Iowa, is found on Stinson Prairie

Strip Mining, Peromyscus and Other Small Mammals in Southern Iowa

Small mammal presence, diversity and reproduction were compared from summer 1975 to summer 1976 on abandoned coal strip mine spoils and unmined land in southern Iowa. More species were trapped on the unmined area, while the relative dominance of Peromyscus spp. on mined land was greater. Peromyscus populations on mined land exhibited a shorter breeding season than on unmined land. Other population parameters did not show clear differences between the areas

Natural History in Iowa: The Early Phases

Natural history in Iowa prior to the 20th Century can be conveniently arranged into 4 phases: Native American, before the Louisiana Purchase, between the Louisiana Purchase and about 1850, and after 1850. Native American natural history was extensive and had a distinctly spiritual character. Natural history was a component of European exploration up to the time of the Louisiana Purchase, but was not treated as a separate endeavor; the evidence from this period comes from the journals and diaries of early exploreres, fur traders and the like. Between the Louisiana Purchase and about 1850, natural history changed from its status as an adjunct to geographic exploration, for instance government sponsored expeditions along the rivers and Army excursions into the interior, to systematic research with natural history as the primary goal. During this period, descriptions of natural history moved from being parts of exploration narratives to reports on natural history itself. After 1850, natural history in Iowa encompassed organized, systematic efforts to record the geology, environment and biota of the state

The Vegetation of the Paleozoic Plateau, Northeastern Iowa

The present vegetation of the Paleozoic Plateau region of Iowa is a fragmented representation of the original complex of oak-hickory forest mixed with more mesophytic forest, open oak savanna and hill prairie. Because of the topographic variation and the relatively cool, moist environment of the region, the forests are the best developed of those in Iowa, and show the greatest variation, including two types of alluvial forests (Salix thickets and alluvial hardwood forest), and several kinds of upland forests (Tilia, Acer, Quercus borealis, Q, alba and Pinus forests). These types represent points along a more-or-less continuous topographic gradient. Many of the native oak savannas have been eliminated, but oak-juniper glades may be found on cliff faces and steep ridges. The remaining hill prairies are rich in species characteristic of the dry prairies farther to the west. Cold, north-facing slopes ( algific slopes ) are the setting for a unique community containing a large number of rare and disjunct species. Outcrops of sandstones and limestone have characteristic microcommunities, often distinguished by their bryophyte or pteridophyte flora. There is a dearth of quantitative vegetation data from the region, and there are numerous research questions about the communities and their plant species that need answers. Preservation and conservation of plant communities and plant species are extremely important and should be addressed by a landscape approach to inventory and management

Mortality risk after COVID-19 vaccination: A self-controlled case series study

Background Although previous studies found no-increased mortality risk after COVID-19 vaccination, residual confounding bias might have impacted the findings. Using a modified self-controlled case series (SCCS) design, we assessed the risk of non-COVID-19 mortality, all-cause mortality, and four cardiac-related death outcomes after primary series COVID-19 vaccination. Methods We analyzed all deaths between December 14, 2020, and August 11, 2021, among individuals from eight Vaccine Safety Datalink sites. Demographic characteristics of deaths in recipients of COVID-19 vaccines and unvaccinated individuals were reported. We conducted SCCS analyses by vaccine type and death outcomes and reported relative incidences (RI). The observation period for death spanned from the dates of emergency use authorization to the end of the study period (August 11, 2021) without censoring the observation period upon death. We pre-specified a primary risk interval of 28-day and a secondary risk interval of 14-day after each vaccination dose. Adjusting for seasonality in mortality analyses is crucial because death rates vary over time. Deaths among unvaccinated individuals were included in SCCS analyses to account for seasonality by incorporating calendar month in the models. Results For Pfizer-BioNTech (BNT162b2), RIs of non-COVID-19 mortality, all-cause mortality, and four cardiac-related death outcomes were below 1 and 95 % confidence intervals (CIs) excluded 1 across both doses and both risk intervals. For Moderna (mRNA-1273), RI point estimates of all outcomes were below 1, although the 95 % CIs of two RI estimates included 1: cardiac-related (RI = 0.78, 95 % CI, 0.58-1.04) and non-COVID-19 cardiac-related mortality (RI = 0.80, 95 % CI, 0.60-1.08) 14 days after the second dose in individuals without pre-existing cancer and heart disease. For Janssen (Ad26.COV2.S), RIs of four cardiac-related death outcomes ranged from 0.94 to 0.98 for the 14-day risk interval, and 0.68 to 0.72 for the 28-day risk interval and 95 % CIs included 1. Conclusion Using a modified SCCS design and adjusting for temporal trends, no-increased risk was found for non-COVID-19 mortality, all-cause mortality, and four cardiac-related death outcomes among recipients of the three COVID-19 vaccines used in the US

The theory of expanded, extended, and enhanced opportunities for youth physical activity promotion

Background Physical activity interventions targeting children and adolescents (≤18 years) often focus on complex intra- and inter-personal behavioral constructs, social-ecological frameworks, or some combination of both. Recently published meta-analytical reviews and large-scale randomized controlled trials have demonstrated that these intervention approaches have largely produced minimal or no improvements in young people\u27s physical activity levels. Discussion In this paper, we propose that the main reason for previous studies\u27 limited effects is that fundamental mechanisms that lead to change in youth physical activity have often been overlooked or misunderstood. Evidence from observational and experimental studies is presented to support the development of a new theory positing that the primary mechanisms of change in many youth physical activity interventions are approaches that fall into one of the following three categories: (a) the expansion of opportunities for youth to be active by the inclusion of a new occasion to be active, (b) the extension of an existing physical activity opportunity by increasing the amount of time allocated for that opportunity, and/or (c) the enhancement of existing physical activity opportunities through strategies designed to increase physical activity above routine practice. Their application and considerations for intervention design and interpretation are presented. Summary The utility of these mechanisms, referred to as the Theory of Expanded, Extended, and Enhanced Opportunities (TEO), is demonstrated in their parsimony, logical appeal, support with empirical evidence, and the direct and immediate application to numerous settings and contexts. The TEO offers a new way to understand youth physical activity behaviors and provides a common taxonomy by which interventionists can identify appropriate targets for interventions across different settings and contexts. We believe the formalization of the TEO concepts will propel them to the forefront in the design of future intervention studies and through their use, lead to a greater impact on youth activity behaviors than what has been demonstrated in previous studies