Investigation using data from ERTS-1 to develop and implement utilization of living marine resources

The author has identified the following significant results. This 15-month ERTS-1 investigation produced correlations between satellite, aircraft, menhaden fisheries, and environmental sea truth data from the Mississippi Sound. Selected oceanographic, meteorological, and biological parameters were used as indirect indicators of the menhaden resource. Synoptic and near real time sea truth, fishery, satellite imagery, aircraft acquired multispectral, photo and thermal IR information were acquired as data inputs. Computer programs were developed to manipulate these data according to user requirements. Preliminary results indicate a correlation between backscattered light with chlorophyll concentration and water transparency in turbid waters. Eight empirical menhaden distribution models were constructed from combinations of four fisheries-significant oceanographic parameters: water depth, transparency, color, and surface salinity. The models demonstrated their potential for management utilization in areas of resource assessment, prediction, and monitoring

Emerging patterns of species richness, diversity, population density, and distribution in the skates (Rajidae) of Alaska

Six years of bottom-trawl survey data, including over 6000 trawls covering over 200 km2 of bottom area throughout Alaska’s subarctic marine waters, were analyzed for patterns in species richness, diversity, density, and distribution of skates. The Bering Sea continental shelf and slope, Aleutian Islands, and Gulf of Alaska regions were stratified by geographic subregion and depth. Species richness and relative density of skates increased with depth to the shelf break in all regions. The Bering Sea shelf was dominated by the Alaska skate (Bathyraja parmifera), but species richness and diversity were low. On the Bering Sea slope, richness and diversity were higher in the shallow stratum, and relative density appeared higher in subregions dominated by canyons. In the Aleutian Islands and Gulf of Alaska, species richness and relative density were generally highest in the deepest depth strata. The data and distribution maps presented here are based on species-level data collected throughout the marine waters of Alaska, and this article represents the most comprehensive summary of the skate fauna of the region published to date

Soil Survey of Iowa, Report No. 49—Worth County Soils

Worth County is located in north central Iowa in the fifth tier of counties west of the Mississippi River and bordering the state of Minnesota on the north. It is partly in the Iowan drift soil area and partly in the Wisconsin drift soil area. Hence, the soils of the county are all of glacial origin, being derived in major part from the Iowan drift and to a smaller extent from the Wisconsin drift

Soil Survey of Iowa, Report No. 8—Clinton County

Clinton county is located in central eastern Iowa along the Mississippi river, partly within the Mississippi loess and partly in the Iowan drift soil areas. Most of the soils are of loessial origin but there are several drift soils whose total acreage is considerable

Soil Survey of Iowa, Report No. 23—Winnebago County Soils

Winnebago county is located in northern central Iowa, bordering on the state of Minnesota, and almost in the exact center of the northern boundary of the state. It lies entirely within the Wisconsin drift soil area. Hence the upland soils of the county are all of glacial origin and the terrace and bottomland types also are derived from the drift material

Soil Survey of Iowa, Report No. 59—Cherokee County Soils

Cherokee County is located in the northwestern part of the state, in the third tier of counties south of the Minnesota state line and in the second tier east of the South Dakota state line. It lies mainly in the Missouri loess soil area and hence the soils of the county are largely of loessial origin

Field experiments with fertilizers on some Iowa soils

Many of the experiments carried out in the field in cooperation with Iowa farmers on some of the more extensive soil types in the state have been under way for 10 or more years. The average results secured on the Carrington loam, the Clarion loam, the Carrington silt loam, the Grundy silt loam, the Grundy silty clay loam, the Tama silt loam, the Muscatine silt loam, the Clinton silt loam, the Marshall silt loam and the Waukesha silt loam are presented and discussed in this bulletin. The results secured show that crop yields may be increased on many Iowa farms by adopting better methods of management and treatment of the land. The Iowa system of soil management, which has been developed from extensive experimental work and has been tested on many farms, points the way toward securing greater crop yields per acre and keeping the land permanently productive. The fertilizing value of farm manure and green manures is well known, but the results given, in this bulletin and in other publications emphasize the importance of keeping up the supply of organic matter in soils

Soil Survey of Iowa, Report No. 38—Hardin County

Hardin county is located in central Iowa in the fourth tier of counties south of the Minnesota state line and in the sixth tier west of the Mississippi River. It lies partly in the Wisconsin drift soil area and partly in the Iowan drift and Southern Iowa loess areas. The soils of the county are therefore of glacial and loessial origin, the major portion of the area being covered by glacial soils