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Title: Seasonal variation in the biomass, tuber density, and photosynthetic metabolism of Hydrilla in three Florida lakes

Abstract

Biomass, tuber densities and various water parameters were measured throughout 1977 in mats of hydrilla (Hydrilla verticillata Royle) in three Florida lakes: Jackson, Orange, and Trafford. In the northern lakes, Jackson and Orange, no mats were present in winter, and a maximum mat biomass of 0.24 Kg dry weight/m/sup 2/ was attained in the late fall. In the southern Lake Trafford, mats were present year round, and the maximum biomass of 0.89 Kg/m/sup 2/ occurred in the summer. In the hydrosoil of lakes Jackson and Orange, tuber densities reached a peak in the late fall, whereas in Lake Trafford they remained high throughout the year. The differences in mat biomass and tuber densities from north to south indicate that control techniques and costs may differ drastically, both seasonally and regionally. In all three lakes the presence of hydrilla mats substantially altered the local aquatic environment. During the day, stratification occurred in the mat but not in open water. High levels of O/sub 2/, pH, and temperature in the mat surface water, and low light penetration, produced unfavorable conditions for the plant growth. Hydrilla plants from all three lakes altered their photosynthetic metabolism from winter to spring, as demonstrated by amore » shift in the CO/sub 2/ compensation points from high to low values. In the spring, a reduction in potential photorespiratory and respiratory activity, and a concomitant increase in net photosynthesis, increased the potential productivity and growth of the plants. It is suggested that submersed aquatic macrophytes belong to a new photosynthetic category.« less

Authors:
; ;
Publication Date:
Research Org.:
Univ. of Florida, Gainesville
OSTI Identifier:
6869714
Alternate Identifier(s):
OSTI ID: 6869714
Resource Type:
Journal Article
Resource Relation:
Journal Name: J. Aquat. Plant Manage.; (United States); Journal Volume: 17
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 59 BASIC BIOLOGICAL SCIENCES; PLANTS; POPULATION DYNAMICS; SEASONAL VARIATIONS; AQUATIC ECOSYSTEMS; BIOLOGICAL EFFECTS; BIOMASS; BOTANY; CARBON DIOXIDE; FRESH WATER; METABOLISM; OXYGEN; PH VALUE; PHOTOSYNTHESIS; PLANT GROWTH; SENSITIVITY; TEMPERATURE EFFECTS; TUBERS; VISIBLE RADIATION; WEIGHT; WEIGHT MEASUREMENT; BIOLOGY; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CHEMICAL REACTIONS; ECOSYSTEMS; ELECTROMAGNETIC RADIATION; ELEMENTS; ENERGY SOURCES; GROWTH; HYDROGEN COMPOUNDS; NONMETALS; OXIDES; OXYGEN COMPOUNDS; PHOTOCHEMICAL REACTIONS; RADIATIONS; RENEWABLE ENERGY SOURCES; SYNTHESIS; VARIATIONS; WATER 520100* -- Environment, Aquatic-- Basic Studies-- (-1989); 550100 -- Behavioral Biology

Citation Formats

Bowes, G., Holaday, A.S., and Haller, W.T. Seasonal variation in the biomass, tuber density, and photosynthetic metabolism of Hydrilla in three Florida lakes. United States: N. p., 1979. Web.
Bowes, G., Holaday, A.S., & Haller, W.T. Seasonal variation in the biomass, tuber density, and photosynthetic metabolism of Hydrilla in three Florida lakes. United States.
Bowes, G., Holaday, A.S., and Haller, W.T. Mon . "Seasonal variation in the biomass, tuber density, and photosynthetic metabolism of Hydrilla in three Florida lakes". United States.
@article{osti_6869714,
title = {Seasonal variation in the biomass, tuber density, and photosynthetic metabolism of Hydrilla in three Florida lakes},
author = {Bowes, G. and Holaday, A.S. and Haller, W.T.},
abstractNote = {Biomass, tuber densities and various water parameters were measured throughout 1977 in mats of hydrilla (Hydrilla verticillata Royle) in three Florida lakes: Jackson, Orange, and Trafford. In the northern lakes, Jackson and Orange, no mats were present in winter, and a maximum mat biomass of 0.24 Kg dry weight/m/sup 2/ was attained in the late fall. In the southern Lake Trafford, mats were present year round, and the maximum biomass of 0.89 Kg/m/sup 2/ occurred in the summer. In the hydrosoil of lakes Jackson and Orange, tuber densities reached a peak in the late fall, whereas in Lake Trafford they remained high throughout the year. The differences in mat biomass and tuber densities from north to south indicate that control techniques and costs may differ drastically, both seasonally and regionally. In all three lakes the presence of hydrilla mats substantially altered the local aquatic environment. During the day, stratification occurred in the mat but not in open water. High levels of O/sub 2/, pH, and temperature in the mat surface water, and low light penetration, produced unfavorable conditions for the plant growth. Hydrilla plants from all three lakes altered their photosynthetic metabolism from winter to spring, as demonstrated by a shift in the CO/sub 2/ compensation points from high to low values. In the spring, a reduction in potential photorespiratory and respiratory activity, and a concomitant increase in net photosynthesis, increased the potential productivity and growth of the plants. It is suggested that submersed aquatic macrophytes belong to a new photosynthetic category.},
doi = {},
journal = {J. Aquat. Plant Manage.; (United States)},
number = ,
volume = 17,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 1979},
month = {Mon Jan 01 00:00:00 EST 1979}
}