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The Unionid Mussels Of The Upper Iowa And Turkey River Watersheds, Jim Eckblad, Brett Ostby, Karis Tenneson
The Unionid Mussels Of The Upper Iowa And Turkey River Watersheds, Jim Eckblad, Brett Ostby, Karis Tenneson
Journal of the Iowa Academy of Science: JIAS
The Iowa driftless region occupies an area of about 9,000 km2 in the northeastern corner of Iowa and is drained by relatively old entrenched meandering streams. The Upper Iowa River and Turkey River are the largest of these streams. During the period from June, 1999 to October, 2000, a total of 193 sites were surveyed for mussels from the Upper Iowa River, the Turkey River, and their main tributaries. Surveys were conducted by hand using a 10 m bank-to-bank search at each site. Data analysis was facilitated using ArcView GIS. The presence of mussels was recorded at 75% of …
Analyzing Anthropogenic Landscapes With Gis And Remote Sensing: A Literature Review, Andi O. Kraft
Analyzing Anthropogenic Landscapes With Gis And Remote Sensing: A Literature Review, Andi O. Kraft
Nebraska Anthropologist
Anthropogenic landscapes are those that have been modified, to varying degrees, by human. Their development is affected by the over-use of natural landscapes in the past such as overgrazing, frequent fires, or excessive depletion of forests. Anthropologists analyzing land-use intensification are now realizing the promise of geographical information systems (GIS) and remote sensingfor their research. A literature review of case studies done on varying anthropogenic landscapes will highlight how GIS can give practical integration of geographic spatial structures (habitation, soils, river drainage) to past and current relationships between the environment and human systems when combined with local-level knowledge. Research of …
Effects Of Cattle Grazing On Woodlands In Central Iowa, Cathy Mabry
Effects Of Cattle Grazing On Woodlands In Central Iowa, Cathy Mabry
Journal of the Iowa Academy of Science: JIAS
Iowa's forests have undergone a dramatic decline in area since settlement by Europeans. Most of the remaining forests have been degraded by an assortment of human impacts, with cattle grazing the most prominent among them. Using a matched pairs study designed to control for environmental differences among plots, I examined the impact of cattle grazing on the forest understory, canopy trees, and tree regeneration. There were distinct groups of understory species associated with ungrazed and grazed plots. Species associated with ungrazed plots were all native and tended to be perennial herbs with fleshy roots. Ungrazed plots also had species preferring …