Relationships between Zooplankton Abundance and Chlorophyll a Concentrations in Florida Lakes

Watkins, Curtis E.

doi:10.1080/02705060.1984.9664611

Cited by 33 publications

(9 citation statements)

References 9 publications

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“…Several authors studied the seasonality of various zooplankton groups in individual Florida lakes [11][12][13][14][15][16][17]. Rotifera and Copepoda nauplii (i.e., two of three groups that comprise microzooplankton) displayed seasonal patterns that seem independent of trophic state [18].…”

Section: Zooplanktonmentioning

confidence: 99%

USE of outdoor freshwater pond microcosms: II. Responses of biota to pyridaben

Rand

Clark

Holmes

2000

Enviro Toxic and Chemistry

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The effects of pyridaben, an insecticide‐miticide on zooplankton, macroinvertebrates, and fish were studied in outdoor freshwater microcosms using an analysis of variance design with three chemical concentrations (0.34, 3.4, 34.0 μg/L) and one untreated control randomized among 24 tanks. Each treatment was replicated six times. Monitoring was conducted during an 11‐month baseline phase followed by a total of three months for treatment and posttreatment phases. Two applications of a wettable powder formulation were sprayed directly below the water surface with a 30‐d interval between treatments. Copepoda adult abundance was significantly reduced at 34.0 μg/L but recovery occurred within 6 weeks after application. Abundance of copepoda nauplii was significantly reduced at 3.4 and 34.0 μg/L, after applications one and two; effects were more severe at 34.0 μg/L and recovery was more rapid at 3.4 μg/L. Abundance of Rotifera was reduced at 34.0 μg/L, after applications one and two, and recovery occurred within 8 weeks for all groups except Polyarthra and Keratella. Of the most abundant Cladocera, abundance of Alona was not significantly affected and abundance of Latonopsis was significantly reduced at 34.0 μg/L, after applications one and two, but recovery occurred within 6 weeks. Abundance of Latonopsis also was significantly reduced at 3.4 μg/L, after applications one and two, but recovery occurred within 2 weeks. A significant decrease occurred in the abundances of Cnidaria, Insecta, and Hydracarina at 34.0 μg/L, only after application one. Pyridaben was toxic to bluegill at 34.0 μg/L, but was not acutely toxic at the laboratory 96‐h LC50 concentration (∼3.4 μg/L).

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Section: Zooplanktonmentioning

confidence: 99%

USE of outdoor freshwater pond microcosms: II. Responses of biota to pyridaben

Rand

Clark

Holmes

2000

Enviro Toxic and Chemistry

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“…Chlorophyll a concentrations did not have significant Spearman Rank Correlations with zooplankton abundance. Although this relationship has been demonstrated for Florida lakes (Bays & Crisman, 1983;Canfield & Watkins, 1984), significant correlation between these parameters was not expected due to the limited range of chlorophyll values exhibited in the four lakes and the high level of variance associated with this relationship.…”

Section: Diversity Indices Year 1 Shannon Year 2 Shannon Year 3 Shannmentioning

confidence: 99%

Response of zooplankton to the reduction and elimination of submerged vegetation by grass carp and herbicide in four Florida lakes

1985

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Zooplankton populations were monitored monthly for a three year period in four Florida lakes. bach lake received an aquatic vegetation control program using grass carp (Ctenophar.~mgodon idella Val.) and herbicide, either alone or in combination. All aquatic vegetation was eliminated in the three lakes with grass carp; it was severely reduced and exhibited qualitative shifts in the lake treated with herbicide alone. Total number of recorded zooplankton species was reduced in each subsequent year as vegetation was eliminated, but mean density 1-I increased greatly. The overall trend in all lakes was toward increasing numbers of small filter-feeding herbivores, with a shift from copepod and copepod-cladoceran dominated to rotifer and small cladoceran dominated systems. It is suggested that these changes reflect primary plankton response to fluctuations in habitat, food base, and planktivore pressure resulting from gradual macrophyte alteration. Changes observed indicate apparent increases in eutrophy.

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“…Because of these strong correlations, we restricted later analyses to only chlorophyll, which is the indicator of actual biological biomass. Conventional wisdom suggests that the base fertility of a lake (trophic status) is a primary driver for the abundance of aquatic organisms, including but not limited to zooplankton abundance (Canfield and Watkins 1984), fish populations (Bachmann et al 1996), bird abundance (Hoyer and Canfield 1994), and even populations of top predators like the alligator (Evert 1999). All these results support the predictions of Fretwell (1987), who suggested that as nutrient levels increase among systems, the abundance of organisms, including top predators, would also increase.…”

Section: Managing Fish For the Benefit Of Peoplementioning

confidence: 99%