Gareth Rowell

• Ph.D. Biological Sciences
• Data Manager (retired) working at home

Native and restored plant communities are part of the foundation of park ecosystems and provide a natural context to cultural and historical events in parks throughout the Heartland Inventory and Monitoring Network (HTLN). Vegetation communities across the HTLN are primarily of three types: prairie, woodland, and forest. Park resource managers nee...

Executive Summary Fish communities are an important component of aquatic systems and are good bioindicators of ecosystem health. Land use changes in the Midwest have caused sedimentation, erosion, and nutrient loading that degrades and fragments habitat and impairs water quality. Because most small wadeable streams in the Heartland Inventory and Mo...

Executive Summary The Heartland Inventory and Monitoring Network (HTLN) is a component of the National Park Service’s (NPS) strategy to improve park management through greater reliance on scientific information. The purposes of this program are to design and implement long-term ecological monitoring and provide information for park managers to eval...

The National Park Service, Natural Resource Stewardship and Science office in Fort Collins, Colorado, publishes a range of reports that address natural resource topics. These reports are of interest and applicability to a broad audience in the National Park Service and others in natural resource management, including scientists, conservation and en...

A protocol for monitoring aquatic invertebrates in tributary streams

The National Park Service, Natural Resource Stewardship and Science office in Fort Collins, Colorado, publishes a range of reports that address natural resource topics. These reports are of interest and applicability to a broad audience in the National Park Service and others in natural resource management, including scientists, conservation and en...

This protocol describes methods used to collect fish community data and associated water quality and habitat data at Buffalo National River and Ozark National Scenic Riverways. The National Park Service, Natural Resource Stewardship and Science office in Fort Collins, Colorado, publishes a range of reports that address natural resource topics. The...

In this brief user’s guide, we describe data management and decision support tools offered by the Midwest Avian Data Center. These tools are designed to manage and analyze bird monitoring data in support of avian conservation and management decisions. There is an emphasis on data management procedures which are typically needed for long-term monito...

Tutorial for using data management tools on Midwest Avian Data Center website. Training materials from MWADC workshop, February 8th, 2015

Introduction to the Midwest Avian Data Center which is part of the Avian Knowledge Network. More info at http://data.pointblue.org/partners/mwadc/

Genetic and environmental sources of variation in the temporal patterning of song structure may be important variables influencing male field cricket reproductive success. Song structure in both field and laboratory populations of Gryllus pennsylvanicus was examined to assess possible sources of variation. Factors examined included temperature, mal...

The condition of streams is a direct reflection of the extent of development and other human uses in the watershed. Non-point source pollution--including urban and agricultural run off, treated sewage, and changes in hydrology--threaten water quality and quantity of streams. Because of these threats, streams are among the most vulnerable natural re...

During the breeding seasons of 2001 through 2003, a total of 517 variable circular plots were surveyed for birds and assessed for habitat composition at Agate Fossil Beds National Monument, Nebraska and Tallgrass Prairie National Preserve, Kansas. Systematic 400 x 400 meter grids, originating from random start points, were used to locate 40 permane...

Ashe juniper (Juniperus ashei Buchholz) is important in woodlands that harbor a diverse biota. Old-growth woodlands in which Ashe juniper is codominant have decreased in area within the Central Texas Hill Country since European settlement. Juniper is often viewed as undesirable because it readily colonizes open spaces and is not highly palatable to...

A computer-based simulation model of a population of honey bee colonies, based on the biology of European and African races of Apis mellifera L., is described. The intracolonial dynamics of each colony are simulated each day based on parameters internal and external to the colony. The honey bee population is the collection of all colonies in the mo...

Male field crickets and other acoustically communicating insects call and attract females and silently intercept females attracted by the calling of other males, so-called satellite behavior. A simulation of field cricket, Gryllus integer, mating behavior suggests that population density and sex ratio changes during the breeding season are importan...

To carry out its mission, the National Park Service (NPS) serves as a steward for the preservation of America's national parks and their resources. The NPS has initiated a service-wide, network-based inventory and monitoring (I&M) program to address the need for science-based natural resource information available to parks. The purpose of the progr...

Thesis (Ph.D.)--University of Kansas, 1989. Includes bibliographical references. Microfiche.