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EFFECTS OF MECHANICAL CONTROL OF AQUATIC VEGETATION ON BIOMASS, REGROWTH RATES, AND JUV...
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EFFECTS OF MECHANICAL CONTROL OF AQUATIC VEGETATION ON BIOMASS, REGROWTH RATES, AND JUVENILE FISH POPULATIONS AT SARATOGA LAKE, NEW YORK
作者:
GeraldF. Mikol,
期刊:
Lake and Reservoir Management
(Taylor Available online 1984)
卷期:
Volume 1,
issue 1
页码: 456-462
ISSN:1040-2381
年代: 1984
DOI:10.1080/07438148409354556
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Experimental mechanical barge/conveyor harvesting conducted in June and August of 1981 and 1982 significantly reduced total plant biomass initially, relative to control areas. Regrowth of the predominant species, Eurasian watermilfoil(Myriophyllum spicatum), reached pre-harvest levels within 30 days after June and August harvestings. Total plant andM. spicatumbiomass (g·m−2, dry) in harvested areas peaked later than control area vegetation both years, and was slightly higher. The ratio of the average annual biomass of the harvested area to the control area was the same both years (0.73), despite significant decreases in overall average total biomass in 1982. Similar harvesting resulted in the removal of primarily juvenile fish. Harvesting was conducted in dense littoral zone stands of milfoil (M. spicatum) and curly-leaf pondweed (Potamogeton crispus). The harvesting operation removed primarily bluegill sunfish (Lepomis macrochirus) and to a lesser degree, largemouth bass (Micropterus salmoides), yellow perch (Perca flavescens) and pumpkinseed sunfish (Lepomis gibbosus). Harvesting effectively removed approximately 2–3 percent of the total standing crop of juvenile fish in both June 1981 and 1982, and approximately 2–8 percent in August of both years.
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