Prediction of Chlorophyll <i>a</i> Concentrations in Florida Lakes: Importance of Aquatic Macrophytes

Canfield, Daniel E.; Shireman, Jerome V.; Colle, Douglas E.; Haller, William T.; Watkins, Curtis E.; Maceina, Michael J.

doi:10.1139/f84-059

Cited by 258 publications

(161 citation statements)

References 9 publications

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“…Real or plastic macrophytes (as described in Lauridsen and Lodge 1996) occurred within an inner area (30-cm diameter), for which macrophyte density was expressed as percent plant volume infested (%PVI). PVI is calculated as the area of macrophyte coverage multiplied by the plant height divided by the water depth (Canfield et al 1984 (Burks pers. obs.…”

Section: Methodsmentioning

confidence: 99%

Littoral zone structures as Daphnia refugia against fish predators

Burks

Jeppesen²,

Lodge

2001

Limnology & Oceanography

144

118

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The assumption that macrophytes can provide zooplankton a daytime refuge against fish predation is central to the diel horizontal migration hypothesis. However, previous observations and experiments have shown that largebodied zooplankton avoid macrophytes. To directly test these contrasting roles of macrophytes, we measured the reaction of Daphnia pulex to macrophytes (Elodea canadensis or plastic) in the presence and absence of chemical cues from two commonly occurring European fishes, roach (Rutilus rutilus) and perch (Perca fluvialitis). In the same series of laboratory experiments, we then tested the ability of different densities of E. canadensis and plastic macrophytes to reduce predation by roach or perch. In the absence of fish, only 27% of daphnids occurred in the macrophytes. However, 70-80% of daphnids occurred in the macrophytes when either roach or perch occurred. In addition, significantly more daphnids occurred in plastic versus real macrophytes, indicating that some chemically mediated avoidance of real macrophytes by Daphnia occurred. In the presence of fish chemical cues from either roach or perch, the differences between real and plastic macrophytes quickly disappeared as daphnids moved into macrophytes. However, this behavior decreased mortality only from roach predation, because perch spent significantly more time than roach foraging among macrophytes. Thus, although daphnids sought macrophyte refuge in the presence of both fishes, the effectiveness of the refuge depended on macrophyte density and predator identity. These results support the idea that macrophytes can increase survival of Daphnia populations in shallow lakes, depending on the fish species present.

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Section: Methodsmentioning

confidence: 99%

Littoral zone structures as Daphnia refugia against fish predators

Burks

Jeppesen²,

Lodge

2001

Limnology & Oceanography

144

118

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“…During the first research period, the data from 285 study sites was collected; during the second onefrom 234 sites. The obtained results allowed to estimate the following parameters that characterize the spatial structure of macrophytes: species frequency in particular ecological groups, the average vegetation cover in these groups, the average cover of particular species, both in the whole reservoir and in different depth ranges, and the PVI (Percent Volume Infested) coefficient for ecological groups (Canfield et al 1984). The PVI coefficient value was determined according to the following formula:…”

Section: Field Studiesmentioning

confidence: 99%

Changes in the spatial structure of submerged macrophytes in Lake Rotcze (Łęczna-Włodawa Lakeland)

Lorens¹,

Sugier²

2010

Oceanological and Hydrobiological Studies

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Changes in the spatial structure of submerged macrophytes in Lake Rotcze (Łęczna-Włodawa Lakeland)The aim of this study is to present short-term changes in the spatial structure of water vegetation in Lake Rotcze. Field studies were carried out during the growing seasons of 2000 and 2005. The obtained results allowed to estimate the following parameters that characterize the spatial structure of macrophytes: species frequency in particular ecological groups, the average vegetation cover in these groups, the average cover of particular species, both in the whole reservoir and in different depth ranges, as well as the PVI (Percent Volume Infested) coefficient for ecological groups. The frequency and cover of some species and ecological groups of macrophytes changed during the study period.

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“…It seems probable that among the factors determining the zooplankton communities within the littoral zone of Lake Wielkowiejskie, among the most important are the morphological and spatial structure of particular macrophyte species. It is expected that the zooplankton communities differ greatly between various macrophyte stands that differ with regard to physical parameters including cover percentage, density, and biomass (Canfield et al 1984, Scheffer 2001.…”

Section: Resultsmentioning

confidence: 99%