Pike Hybrids (\u3ci\u3eEsox lucius\u3c/i\u3e x\u3ci\u3e E. vermiculatus\u3c/i\u3e) in a Sandhill Lake, Nebraska

In the sandhill region of Nebraska both northern pike, Esox lucius, and grass pickerel, Esox vermiculatus, are abundant in several shallow natural lakes. Both species are known to utilize the same vegetative habitat for spawning during March and April. The pike is an important game species but the smaller pickerel is of little value to fishermen although in winter is at times taken by angling through the ice

Pike Hybrids (\u3ci\u3eEsox lucius\u3c/i\u3e x\u3ci\u3e E. vermiculatus\u3c/i\u3e) in a Sandhill Lake, Nebraska

In the sandhill region of Nebraska both northern pike, Esox lucius, and grass pickerel, Esox vermiculatus, are abundant in several shallow natural lakes. Both species are known to utilize the same vegetative habitat for spawning during March and April. The pike is an important game species but the smaller pickerel is of little value to fishermen although in winter is at times taken by angling through the ice

Some Ecological Relations of Fairy Shrimps in Alkaline Habitats of Nebraska

Ecological studies on the distribution of fairy shrimps have been made from 246 sites in the sandhills region of Nebraska. New records for Nebraska have been established for Artemia salina, Branchinecta campestris, B. lindahli, B. mackini and Cyzicus mexicanus. Seasonal populations of shrimp have been located in habitats containing permanent fish populations. Water mineralization was the dominant environmental condition related to the distribution of phyllopods with sodium and potassium compounds predominating in the strongly alkaline lakes. Several of the Artemia lakes were classified as hydroxide sites. Many of the alkaline ponds, where B. lindahli and B. campestris flourish, are chemically different from the sodium chloride waters common throughout the western United States. The Nebraska Sandhill Region, an area of about 20,000 sq miles, is a plains environment that has been extensively modified by wind. It is a region of vegetated sandhills, sandy basins and valleys, with numerous exposed ground-water lakes and marshes of a permanent or seasonal nature (Fig. 1). An extensive limnological inventory of the aquatic habitats of the sandhills was undertaken between 1954 and 1961. This inventory was used to formulate a management program for sport fisheries (McCarraher, 1961). About 1640 lakes were investigated and an additional 850 permanent, smaller lakes less than 10 surface acres were recorded. In addition to permanent water, numerous seasonal pools were found. Periodic sampling of these permanent lakes and numerous seasonal ponds was carried out during all months of the year over a 12-year period from 1954 to 1968. This paper reports on the distribution of phyllopods in alkaline lakes of Nebraska and describes the quality of water and associated biota. The inland mineral waters of arid regions of the western United States have been designated as saline since sodium chloride is the principal solute with a pH value normally less than 8.8. In Nebraska\u27s alkaline waters chloride salts occur in insignificant quantities. For this reason the term salinity, used in describing marine or inland chloride and sulfate waters, is employed here as a collective term for all dissolved ionic constituents, with concentrations expressed as parts per million (ppm)

Northern Pike, \u3ci\u3eEsox lucius\u3c/i\u3e, in Alkaline Lakes of Nebraska

Pike (Esox lucius) were studied in alkaline sandhill lakes from 1956 through 1961. Fry and fingerlings were released in alkaline environments as part of a continuing ecological study of survival and growth of northern pike in Nebraska waters. Survival and growth were determined by intensive nettings at release sites. Chemical, biological, and physical characteristics of each lake were investigated (Table 1). The majority of the nearly 2,000 Nebraska sandhill lakes may be classified as alkaline eutrophic of the bicarbonate-sulfate group (McCarraher). Salts other than chlorides predominate in these natural lakes supporting a biota somewhat different from inland chloride or saline waters. The sandhill lakes differ chemically from inland mineral areas in other regions (Rawson and Moore, 1944; Huntsman, 1922; Moyle, 1956; Young, 1924.)

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Curso de Especial InterésLa siguiente propuesta, contiene la información necesaria para poder asesorar y brindar una mejor atención a los procesos que son inherentes a la sexualidad del ser humano. El diseño de la creación de una aplicación llamada iPrevent, usada en aparatos tecnológicos como los móviles con sistema Android y Apple. Esta aplicación está encaminada a presentar y a exponer los distintos métodos anticonceptivos que se encuentran en el mercado, así mismo brindar un marco de conocimiento de cada uno, para facilitar la toma de decisiones de los adolescentes; de esta manera teniendo una correlación con la salud pública y mitigar los embarazos no deseados y posibles interrupciones voluntarias del embarazo (IVE) y uso de Métodos Anticonceptivos de emergencia en esta población.101 p.1. Resumen 2. Justificación 3. Marco teórico 4. Objetivos 5. Metodología 6. Estudio de mercadeo 7. Resultados 8. Discusión 9. Conclusiones y recomendaciones 10. Referencias 11. ApéndicesPregradoPsicólog

LIMNOLOGY OF CARBONATE – BICARBONATE LAKES IN NEBRASKA

The relation between chemical, physical and biological indices was examined in 1,640 sandhill lakes during the years of 1954 to 1963. Sandhill lakes are formed by either (1) wind deflation basins and closed drainages or (2) exposed ground water table basins. Topography of the 20,000 square mile sandhill region is primarily stabilized dune sand interspersed with wet meadows and pine - cedar - oak river drainage systems. Two-thirds of the area is dune sandhills and one-third occupied by basins, valleys and lakes. All of the lakes are comparatively shallow, the deepest lake being Blue Lake with 13.8 feet. The average depth of the 1,640 lakes is around 3.2 feet. The lakes have a combined area of 65,800 surface acres ranging in size from 10 to 2,300 acres. Permanent natural lakes less than 10 acres were not included in the survey but number about 850. Average rainfall is less than 18.0 inches a year

Extension of the Range of Northern Pike (\u3ci\u3eEsox lucius\u3c/i\u3e)

Recent technical publications and popular literature have not fully established the present geographical range of the northern pike. A survey by the writer in 1955 showed that 26 states and Canadian provinces had resident northern pike populations. During the past 5 years pike have been introduced into several other states, thus extending the range. Pike are already established in most of the northern states and are now being released into waters of the south and west

A PRELIMINARY BIBLIOGRAPHY AND LAKE INDEX OF THE INLAND MINERAL WATERS OF THE WORLD

This preliminary- bibliography and lake index has been prepared by the author on the basis of information available in the Office of Limnology, Hastings College, Nebraska. Although all source material available there has been searched, it is recognized that many papers, especially those published in regional languages may have been left out. Readers are requested to point out such omissions and any inaccuracies that require correction. This preliminary bibliography will be circulated among specialists in the subject for corrections to the citations and for suggested additions to the list. It is planned that the paper will then be revised to include abstracts of articles available to the compiler and issued as an FAO Fisheries Technical Paper