Download or read book Sago Pondweed Potamogeton Pectinatus L written by Harold A. Kantrud and published by . This book was released on 198? with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sago Pondweed Potamogeton Pectinatus L written by Harold A. Kantrud and published by . This book was released on 1990 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sago pondweed is a submerged macrophyte of nearly cosmopolitan distribution. The plant is of worldwide importance as a waterfowl food but also can be a nuisance in irrigation canals and recreational areas. Future research should concentrate on (1) determining, in a variety of wetland types, the causes of light-limiting turbidity that often suppresses sago growth, (2) understanding the ways in which human activities on and near wetlands affect sago production, and (3) developing reliable and predictable techniques to stimulate sago production for waterfowl by using water level manipulations and other means, in a variety of environmental settings.
Download or read book Ecology of Sago Pondweed Potamogeton Pectinatus L Communities written by Alden L. Kollman and published by . This book was released on 1974 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Reproduction and Mode of Spread of Sago Pondweed Potamogeton Pectinatus L in Irrigation System written by Alex G. Ogg and published by . This book was released on 1966 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nine experiments were conducted during 1964 and 1965 to study the methods of reproduction and mode of spread of sago pondweed (Potamogeton pectinatus) in irrigation systems. Frequent treatments of sago pondweed foliage with aromatic solvent greatly reduced the number of tubers in the substratum of an irrigation canal. However, complete eradication of all tubers in one irrigation season was not obtained. Ecological investigations revealed that sago pondweed was capable of invading and becoming established in new irrigation channels in one season. The propagules responsible for the establishment of new infestations were tubers and plant fragments. Considerable numbers of sago pondweed seed were transported into the new channels by the water, but no seedlings were found. Sago pond-weed tubers survived freezing temperatures under field conditions. Subsequent studies in the laboratory showed that sago pondweed tubers could become somewhat hardened or conditioned to withstand freezing temperatures. Removal of the parent tuber did not affect the survival of emerged shoots nor did it prevent the growth of excised sprout tips. The main portion of the tuber appeared to have a function other than initiating growth. The study of shoot emergence from tubers indicated a relationship between the weight of the tuber and the depth from which the shoot would emerge. The main portion of the tuber, whose dry weight consists primarily of carbohydrates, may function as a food reserve enabling the shoot to emerge from a considerable depth in the soil. Sago pondweed seeds that had overwintered in a canal bottom gave 15 percent germination in a greenhouse aquarium after a 50-day period. Seeds that had passed through the digestive tracts of wild-ducks germinated abundantly. However, if the seeds were held in the digestive tract for more than three days, no germination occurred. The storage of sago pondweed seeds at different conditions of temperature and moisture for different periods of time resulted in significant differences in the percentages of germination. Storage of seed in water at 0.0 degrees C. for 12 days resulted in the highest percentage of germination. The seed germination studies indicated that the importance of seed in the spread of sago pondweed in irrigation systems may be underestimated.
Download or read book Sago Pondweed Potamogeton Pecinatus L A Literature Review written by and published by . This book was released on 1990 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sago pondweed (Potamogeton pectinatus L.) is a submersed macrophyte of nearly cosmopolitan distribution. The plant is of worldwide importance as a waterfowl food but also can be a nuisance in irrigation canals and recreational areas. The plant reproduces by many different means, depending on habitat and environmental stress. Several genetic ecotypes have evolved. Most important as waterfowl food are the turions (tubers), vegetative propagules rich in carbohydrates that are mostly buried in bottom sediments. In temperate wetlands, most turions sprout in spring, making sago behave as an annual. Drupelets (seeds) are the sexual propagules of sago and provide a mechanism for sago to survive periods of drought and excessive water salinity. Drupelets can be washed ashore or carried by birds for long distances. Sago decomposes rapidly at senescence, annually in temperate wetlands.
Download or read book Production and Waterfowl Utilization of Sago Pondweed Potamogeton Pectinatus on the Marshes of the Bear River in Northern Utah written by Robert Leon Craner and published by . This book was released on 1965 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Net Photosynthesis and Respiration of Sago Pondweed Potamogeton Pectinatus Exposed to Herbicides written by MS. Ailstock and published by . This book was released on 1995 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: We determined net photosynthesis and respiration rates for sago pondweed (Potamogeton pectinatus) exposed to various concentrations of 11 herbicides widely used in Maryland during the past decade. Net photosynthesis and respiration were determined by measuring changes in the oxygen content of solutions containing dilutions of technical grade herbicides. At 20-22° C and 58 ?mol/m2/sec of photosynthetically active radiation (PAR), oxygen production of undosed plants averaged 0.72-2.03 mg/g fresh wt/h. Respiration rates of undosed plants averaged 0.46-0.60 mg O2/g fresh wt/h. Nominal herbicide concentrations (ng/L) that reduced net photosynthesis by 50 percent (IC50) were: metribuzin, 8; atrazine, 29; cyanazine, 32; linuron, 70; simazine, 164; and paraquat, 240. IC50 values for 2,4-D, acifluorfen, glyphosate and metolachlor exceeded the maximum test concentration of 10,000 ng/L. The IC50 value for alachlor was estimated to be between 1,000 and 10,000 ng/L. None of the herbicides tested had a significant effect on dark respiration.
Download or read book Impact of Heavy Metals on Potamogeton Pectinatus Sago Pondweed in the Heron Lake System written by Anthony D. Wagner and published by . This book was released on 1996 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seasonal Utilization of Sago Pondweed by Waterfowl at Bear River Migratory Bird Refuge Utah written by Michael Robert Sterling and published by . This book was released on 1970 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Various Environmental Factors on Growth of Native and Transplanted Sago Pondweed Potamogeton Pectinatus in the Heron Lake System MN written by Shawn M. Schroeder and published by . This book was released on 2002 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Simulation Model for Growth of the Submersed Aquatic Macrophyte Sago Pondweed Potamogeton Pectinatus L written by and published by . This book was released on 2003 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: A simulation model for biomass dynamics of the submersed macrophyte Potamogeton pectinatus L. is presented. The model (POTAM) is based on carbon flow through the vegetation in meter-squared (m2) water columns. It includes descriptions of several factors that affect biomass dynamics, such as site characteristic changes in climate, temperature, water transparency, water level, pH, and oxygen effects on CO2 assimilation rate at light saturation, wintering strategies, mechanical control (removal of shoot biomass), and grazing. The characteristics of community and site can be easily modified by the user. POTAM incorporates insight into the processes affecting the dynamics of a sago pondweed community in relatively shallow, hard water (0.1-to 6-m depth; dissolved inorganic carbon concentration> 0.8 mmol and pH> 6), under ample supply of nitrogen and phosphorus in a pest-, disease-, and competitor-free environment under the prevailing weather conditions. It has been calibrated on data pertaining to a sago pondweed community in the Western Canal near Zandvoort, The Netherlands. At this site, growth starts from the subterranean tubers alone. Plant biomass usually peaks once a year, in July, and intensive downward transport of soluble carbohydrates occurs after anthesis, used for the formation of tubers that grow into the sediment. POTAM simulated the dynamics of plant and tuber biomass and tuber numbers in the Western Canal near Zaudvoort, The Netherlands, well over a period of 1 to 5 years. Starting from measured instead of nominal tuber size increased the similarity between simulated and measured plant data. The importance of several plant species- characteristic properties was explored, namely, of leaf surface:dry weight ratio, tuber bank density, anchorage depth, and presence/absence of wintering shoots.
Download or read book Distribution of Selected Heavy Metals Between Sediments and Sago Pondweed Potamogeton Pectinatus in the Heron Lakes System MN written by Jeff Scripter and published by . This book was released on 1996 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of Factors Affecting the Growth and Reproduction of Sago Pondweed Potamogeton Pectinatus Within a Brackish Impoundment at Wallace Bay Nwa During 1981 1982 and 1983 written by R. G. Hounsell and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of Factors Affecting the Growth and Reproduction of Sago Pondweed Potamogeton Pectinatus Within a Brackish Impoundment at Wallace Bay Nwa During 1981 1982 1983 and 1984 Completion Report written by R. G. Hounsell and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Response of Sago Pondweed a Submerged Aquatic Macrophyte to Herbicides in Three Laboratory Culture Systems written by MS. Ailstock and published by . This book was released on 1991 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The phytotoxicity of atrazine, paraquat, glyphosate, and alachlor to sago pond-weed (Potamogeton pectinatus), a submerged aquatic macrophyte, was tested under three types of laboratory culture conditions. In each case, tests were conducted in static systems, the test period was four weeks, and herbicide exposure was chronic, resulting from a single addition of herbicide to the test vessels at the beginning of the test period. The three sets of test conditions employed were: (1) axenic cultures in 125-mL flasks containing a nutrient media and sucrose; (2) a microcosm system employing 18.9-L buckets containing a sand, shell, and peat substrate; and (3) an algae-free system employing 0.95-L jars containing reconstituted freshwater and a nutrient agar substrate. The primary variable measured was biomass production.
Download or read book Bibliography of critical tissue nutrient concentration in submersed aquatic macrophytes and tissue nutrient concentrations in sago pondweed Potamogeton Pectinatus L written by John D. Madsen and published by . This book was released on 1991 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Growth Plant Peroxidase Activity and Stress Proteins in the Submersed Aquatic Macrophyte Potamogeton Pectinatus L sago Pondweed Exposed to Heavy Metals written by Melanie May Siesko and published by . This book was released on 1995 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
