Correlations of Regulated Lake Levels and Climatic Factors with Abundance of Young-of-the-Year Walleye and Yellow Perch in Four Lakes in Voyageurs National Park

1987 ◽  
Vol 7 (4) ◽  
pp. 513-521 ◽  
Author(s):  
Larry W. Kallemeyn
Keyword(s):  
National Park ◽  
Yellow Perch ◽  
Climatic Factors ◽  
Lake Levels ◽  
Young Of The Year ◽  
Voyageurs National Park ◽  
Regulated Lake

Stabilization of Shoreline Archaeological Sites at Voyageurs National Park

1989 ◽  
Vol 54 (4) ◽  
pp. 792-801 ◽  
Author(s):  
Mark J. Lynott
Keyword(s):  
National Park ◽  
Large Scale ◽  
Data Recovery ◽  
Archaeological Sites ◽  
Lake Levels ◽  
Large Scale Data ◽  
Park Service ◽  
Voyageurs National Park ◽  
Scale Data ◽  
Filter Fabric

Elevated lake levels resulting from dam construction in the early twentieth century is producing widespread shoreline erosion at Voyageurs National Park, Minnesota. In an effort to preserve a sample of the more significant archaeological sites, the National Park Service has initiated a program of site stabilization. Stabilization of the Clyde Creek and Sweetnose Island sites was accomplished during the winter months by transporting materials and supplies across an ice road. The use of filter fabric and turf-stabilization matting in association with large quantities of sediment and riprap have produced a new shoreline that serves to protect the respective archaeological deposits. This approach has successfully preserved these intact archaeological resources and avoided the costs associated with large-scale data recovery and curation of collections.

scholarly journals Lake levels and water quality in comparison to fish mercury body burdens, Voyageurs National Park, Minnesota, 2013–15

2017 ◽  
Author(s):  
Victoria G. Christensen ◽  
James H. Larson ◽  
Ryan P. Maki ◽  
Mark B. Sandheinrich ◽  
Mark E. Brigham ◽  
...  
Keyword(s):  
Water Quality ◽  
National Park ◽  
Lake Levels ◽  
Voyageurs National Park

Walleye (Stizostedion vitreum vitreum) and Yellow Perch (Perca flavescens) Populations and Fisheries of the Red Lakes, Minnesota, 1930–75

1977 ◽  
Vol 34 (10) ◽  
pp. 1774-1783 ◽  
Author(s):  
Lloyd L. Smith Jr.
Keyword(s):  
Growth Rate ◽  
Yellow Perch ◽  
Climatic Factors ◽  
Perca Flavescens ◽  
Growing Season ◽  
Commercial Fishery ◽  
Class Strength ◽  
Parent Stock ◽  
Catch Statistics

In an investigation of the commercial fishery of Red Lakes, Minnesota, for the 46-yr period 1930–75, catch statistics were analyzed, and the dynamics of the perch and walleye populations were examined. Mean annual yields of walleye for two statistical periods, 1930–53 and 1954–75, were 309,900 and 245,100 kg, respectively for walleyes, and 96,400 and 109,500 kg for perch. Annual abundance (CPE based on average catches per day per 5-net units of gill nets) varied from 3.8 to 64.6 kg for walleye, and from 2.5 to 34.4 kg for perch. Causes of fluctuations in harvestable stock were directly related to strength of year-classes and to growth rate during the season of capture. Year-class strength was not related to the abundance of parent stock or of potential predators. The respective strengths of year-classes of perch and walleye in the same year were positively correlated (r = 0.859, P < 0.01), and are directly related to climatic factors. Growth rate of walleye in different calendar years varied from +30.7 to −42.2% of mean growth, and that of perch from +13.4 to −8.6% (1941–56). Growing season began in mid-June and was almost over by September 1. Walleye yield could be enhanced by starting harvest July 1 instead of early June. Perch yield could be improved by harvesting small perch. Key words: Percidae, Perca, population dynamics, Stizostedion, long-term yield

scholarly journals Altitudinally coordinated pattern of plant community structure in the Shivapuri National Park, Nepal

1970 ◽  
Vol 18 (1) ◽  
pp. 11-17 ◽  
Author(s):  
Shalik Ram Sigdel
Keyword(s):  
Community Structure ◽  
Species Diversity ◽  
Plant Species ◽  
Plant Community ◽  
National Park ◽  
Climatic Factors ◽  
Flower Colour ◽  
Basal Area ◽  
Plant Community Structure ◽  
Closed Canopy

Study on plant community structure was undertaken in different altitudinal ranges of Shivapuri National Park. The general objective of this study is to analyse different plant community structure in Shivapuri National Park with regards to altitudinal variation. The forest was divided into three distinct altitudinal ranges on the basis of dominancy. In each altitudinal range standard quadrats method was applied for vegetation analysis. The highest number of species was found in site II. All the ecological parameters of the plant species were higher in site II except Basal Area of tree that was highest in site III. The pattern of distribution of plant species was not uniform according to altitude. At higher elevation, the forest was mature with almost closed canopy and trees were large; so the tree density was low. Species richness was highest in site II. Species diversity among tree and shrub species was higher in site I. But for herb species diversity was higher in site II for both seasons. Such type of variations may be due to nature of soil i.e. acidity, nutrient availability and other micro-climatic factors. The most noteworthy thing was that variation in flower colour of Rhododendron arboreum i.e. deep scarlet at low altitude, but it gradually changed into pinkish white as altitude increased. Key words: Altitude, Density, Plant community, Species diversity doi: 10.3126/banko.v18i1.2161 Banko Janakari, Vol. 18, No. 1, 11-17

scholarly journals A pedogeomorphic comparison of two granitic areas in the Kruger National Park

Koedoe ◽  
1990 ◽  
Vol 33 (2) ◽  
Author(s):  
M.C. Munnik
Keyword(s):  
National Park ◽  
Climatic Factors ◽  
Parent Material ◽  
Kruger National Park ◽  
Erosion And Deposition ◽  
The Creation

Two climatically different areas on granitic materials near Phalaborwa and Pretoriuskop in the Kruger National Park were pedogeomorphologically compared and the influence of climatic factors on soil and hillslope development in the two areas was assessed. The examination of 18 hillslopes and their soils showed that while the two areas have many broad similarities, there are specific soil and hillslope differences between them with the result that each area has its own distinctive pedogeomorphic character. While comparable parent material, situation and age appear to be responsible for similarities between the areas, the differences could in most cases be accounted for by the disparity in rainfall between the two areas. It was, however, also necessary to note the role of past (and possibly current) cycles of erosion and deposition in the creation of the two types of simple hillslopes occurring in the areas.

Responses of Walleye (Stizostedion vitreum vitreum) and Yellow Perch (Perca flavescens) Populations to Removal of White Sucker (Catostomus commersoni) from a Minnesota Lake, 1966

1977 ◽  
Vol 34 (10) ◽  
pp. 1633-1642 ◽  
Author(s):  
Fritz H. Johnson
Keyword(s):  
Species Interactions ◽  
Standing Crop ◽  
Yellow Perch ◽  
Perca Flavescens ◽  
Food Competition ◽  
Community Response ◽  
Stizostedion Vitreum ◽  
Catostomus Commersoni ◽  
Young Of The Year ◽  
Fish Species Diversity

In a northeastern Minnesota lake subject only to sportfishing, removal of 85% of the estimated standing crop (34 kg/ha) of adult white suckers, Catostomus commersoni in 1966 was followed by marked changes in community structure and interrelations. During 7 yr alter the removal: catch indices for adult suckers remained far below those before the sucker removal but juvenile suckers increased about 17-fold; yellow perch, Perca flavescens, increased about 15-fold; walleye Stizostedion vitreum vitreum, standing crop increased about one-third; mayflies increased in diet of adult perch and smaller invertebrates decreased; micro-crustaceans increased in diet of young-of-the-year and juvenile perch; young-of-the-year perch increased in diet of adult walleye; walleye angling yield increased from an average of 3.0 kg/ha before the removal to an average of 4.9 kg/ha in 1970–73; the rate of exploitation of adult walleye did not change with increase in angling effort; and the increased walleye harvest consisted mostly of fish recruited to the catch during the fishing season. The average annual harvest of walleye in 1970–73 exceeded estimated potential production for all fish by 81.5% and probably cannot be sustained. Removal of white suckers from lakes with limited fish species diversity appears to benefit percid populations. Key words: Percidae, species interactions, (Stizostedion vitreum vitreum), Perca flavescens, Catostomus commersoni, harvests, community response, community ecology, food, competition

scholarly journals River Otter (Lontra canadensis) Killed by Wolves (Canis lupus) during Winter in Northern Minnesota

2018 ◽  
Vol 131 (3) ◽  
pp. 252-253
Author(s):  
Thomas D. Gable ◽  
Steve K. Windels ◽  
Ian C. Rautio
Keyword(s):  
Canis Lupus ◽  
National Park ◽  
Lontra Canadensis ◽  
River Otter ◽  
Gray Wolves ◽  
Mammalian Predators ◽  
Voyageurs National Park

Few accounts exist of Gray Wolves (Canis lupus) killing small sympatric mammalian predators. In January 2017, we observed a River Otter (Lontra canadensis) that had been killed by wolves on the ice in Voyageurs National Park, Minnesota. This is one of only a few documented instances of wolves killing otters.

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