2002
DOI: 10.1127/archiv-hydrobiol/153/2002/469
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Nutrient release and detritus production by herbicide-treated freely floating aquatic vegetation in a large, shallow subtropical lake and river

Abstract: The areal extent of freely fl oating aquatic vegetation (FFAV), treated annually with herbicides in Lake Okeechobee and the Kissimmee River, was com piled, and preliminary estimates were made of the amounts of detritus produced and total nitrogen (N) and total phosphorus (P) released. On average, over the 24-yr period of record for Lake Okeechobee from 1975 through 1998, 14,281 ± 1,544 metric tons (m.t.) of detritus was produced, and 285 ± 31 m.t. of N and 74 ± 8 m.t. of P were returned to the water column. Nu… Show more

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Cited by 7 publications
(5 citation statements)
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“…The slower average rate in the Kissimmee River may partially reflect losses from the ODL by continued decomposition and mineralization during the Baseline Period, slower deposition rates by species other than water hyacinth, lower vegetation coverage in the river than in the cited experiment, or a combination of these factors. Organic deposition was likely reduced after 1988 when maintenance herbicide control reduced the coverage of invasive floating aquatic vegetation, such as water hyacinth and water lettuce ( Pistia stratiodes ) in the Kissimmee River (Grimshaw ).…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…The slower average rate in the Kissimmee River may partially reflect losses from the ODL by continued decomposition and mineralization during the Baseline Period, slower deposition rates by species other than water hyacinth, lower vegetation coverage in the river than in the cited experiment, or a combination of these factors. Organic deposition was likely reduced after 1988 when maintenance herbicide control reduced the coverage of invasive floating aquatic vegetation, such as water hyacinth and water lettuce ( Pistia stratiodes ) in the Kissimmee River (Grimshaw ).…”
Section: Discussionmentioning
confidence: 99%
“…Remnants of the native channel remained connected to C‐38 but did not carry flow except for local runoff (Toth ; Toth et al ). The absence of flow allowed aquatic vegetation to expand in the river channel; as the vegetation died, the detritus accumulated on the river bed as a primarily organic deposition layer (ODL) (Toth , ; Grimshaw ; Bousquin et al , Chapter 3; Bousquin & Colee ). The ODL was 1 m thick in some places (Toth ) and was beginning to fill in the river channel (Toth ; Bousquin et al , Chapter 3).…”
Section: Introductionmentioning
confidence: 99%
“…Twice‐annual herbicide treatments targeted at in‐channel monocultures were undertaken to reduce cover of these species in remnant channels. By 1988, reductions to sustainable levels of invasive species had been achieved (Grimshaw ). The program has the objective of “maintenance control” levels of floating exotics.…”
Section: Methodsmentioning
confidence: 99%
“…First, because a "forward switch" into a turbid algal state results in cascading changes to biotic assemblages and sediment structure, even substantial reductions of external nutrient loading will not lead to a straightforward recovery of the previous macrophyte community (Scheffer et al 1993). Largescale control of exotic macrophytes has been suggested as such a catalyst for forward shifts observed in several Florida lakes, including Lake Apopka (Clugston 1963, Chesnut andBarman 1974), Lake Okeechobee (Grimshaw 2002), and Lake Tarpon (Robison and Zarbock 1998). A second implication of this alternative steady states logic is that widespread herbicide use and similar disruptions caused by invasive plant control activities may catalyze a forward shift in stable state from macrophytes to algal dominance.…”
Section: Alternative Stable Statesmentioning
confidence: 99%