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Shumate, Byron C.; Schelske, Claire L.; Crisman, Thomas L.; Kenney, William F.

doi:10.1023/a:1013599502262

Cited by 29 publications

(2 citation statements)

References 7 publications

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“…Major changes in the fish community occurred after 1947 (Clugston 1963;Lowe et al 1999). Microfossil evidence also indicates zooplankton community structure changed after the shift (Shumate et al 2002). Schelske et al (2000) found diatom microfossils changed in a pattern consistent with macrophyte shading driven by progressive nutrient enrichment (Phillips et al 1978) and inconsistent with the theory of alternate stable states (Scheffer et al 1993).…”

Section: Discussionmentioning

confidence: 99%

How anthropogenic darkening of Lake Apopka induced benthic light limitation and forced the shift from macrophyte to phytoplankton dominance

Schelske

Lowe

Kenney

et al. 2010

Limnology & Oceanography

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Controversy exists about the historic shift of primary producer community structure (PPCS) in Lake Apopka, a shallow, 125-km 2 lake in central Florida, U.S.A. The controversial questions are: was a lake-wide shift from macrophyte to phytoplankton dominance triggered by a 1947 hurricane or tornadoes spawned by the hurricane within a few weeks or months, or was the shift forced by progressive cultural eutrophication over several years? In 1947, fringing wetlands (35 km 2 ) were being diked and drained for agricultural purposes changing their function from nutrient sinks to nutrient point sources to the lake. We examined whether anthropogenic darkening of the water column induced the PPCS shift during a 0.6-m lake-stage rise. Darkening was defined as lake-bottom photosynthetically available radiation (PAR) # 1.0% of incident PAR. We simulated darkening from changes in the light extinction coefficient (K d ) due to water color, chlorophyll a, and rising lake stage. Simulations predicted that darkening was restricted to 80% of the lake deeper than 2.16 m, a finding consistent with persistence of shallow-water submersed macrophytes after 1947. Anthropogenic wetland draining increased water color, lake stage, and phytoplankton blooms stimulated by phosphorus enrichment, causing a progressive shift to lake-wide phytoplankton dominance over at least several years. The relationship between the 1947 hurricane and the PPCS shift was not causal, but only a temporal coincidence. Our darkening model can be applied to other systems with known bathymetry to predict submersed aquatic vegetation (SAV) coverage from SAV light requirements and water-column light attenuation.

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Section: Discussionmentioning

confidence: 99%

How anthropogenic darkening of Lake Apopka induced benthic light limitation and forced the shift from macrophyte to phytoplankton dominance

Schelske

Lowe

Kenney

et al. 2010

Limnology & Oceanography

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“…Cladoceran remains (Crustacea: Branchiopoda) are widely used to infer significant changes in environmental variables, such as eutrophication, salinity and nutrient concentrations, and with alterations in fish community structure and abundance [2][3][4] . Their chitinous exoskeletal components (shell, head shield, postabdomen, postabdominal claws, antennal segments, and mandibles) are usually well preserved after death.…”

Section: Introductionmentioning

confidence: 99%

Reconstructing Lake History Changes from Zooplankton Subfossil in the Sediment of Wuliangsuhai Lake, China

Liu

Jin³

et al. 2011

AMR

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The sediment samples of zooplankton subfossil at different depths were collected from a large shallow lake Wuliangsuhai Lake, China, in order to reconstruct lake past changes. The lake began to switch to eutrophication gradually in the middle 1980s, creating a sediment discontinuity layer (about 32.5 cm depth) that can be visually used to separate sediments derived from plankton and macrophyte. Inferences about the timing and trajectory of eutrophication were made using sediment zooplankton subfossil reconstruction. The changes in composition of the zooplankton fragments were rather gradual up the core, whereas the total numbers of fragments show the most marked changes from 32.5 cm to present. Changes in the composition of zooplankton fragments (in 32.5 cm depth) show a gradual shift from a “pelagic community” dominated by B. longirostris, reflecting clearwater conditions with high predation pressure, to a more “benthic” community, dominated by plant associated Chydorids. The results suggest that it is possible to reconstruct past eutrophication trends of the lake by using zooplankton subfossil, and that anthropogenic pollutant loading is the key factor in the eutrophication of Lake Wuliangsuhai.

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Habitat type as strongest predictor of the body size distribution of Chydorus sphaericus (O. F. Müller) in small water bodies

Basińska

Antczak

Świdnicki

et al. 2014

Internat. Rev. Hydrobiol.

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Chydorus sphaericus, a cladoceran characterized by a wide range of distribution, is often numerous in various water habitats. Its body size is a consequence of environmental characteristics and physiology. The aim of the study focused on the distribution of body size and densities of C. sphaericus in relation to environmental conditions represented by: (i) habitat types (elodeids, helophytes, and the open water); (ii) specific pond types (forest and field); (iii) pond size (surface area); (iv) the presence/lack of fish; and (v) physicochemical factors. Similar to large daphnids, in the case of the examined small water bodies, fish presence was responsible for a reduction of the body size of C. sphaericus in the zone of open water. More abundant crustacean communities and the presence of larger specimens were found among macrophytes, which indicated that aquatic vegetation offered optimal growth conditions as well as an effective refuge against fish predation. These facts reflect the necessity for maintaining a varied mosaic of habitats even in small water bodies such as the examined ponds. We found that not only the abundance of C. sphaericus but also its body size can be used as an bioindicator of environmental conditions as it preferred small and eutrophic ponds, particularly those with complex macrophyte cover (such as elodeids). Furthermore, the abundance pattern of zooplankton dominant species was affected by elodeids and fish presence as well as by the area of the ponds.

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Cited by 29 publications

References 7 publications

How anthropogenic darkening of Lake Apopka induced benthic light limitation and forced the shift from macrophyte to phytoplankton dominance

How anthropogenic darkening of Lake Apopka induced benthic light limitation and forced the shift from macrophyte to phytoplankton dominance

Reconstructing Lake History Changes from Zooplankton Subfossil in the Sediment of Wuliangsuhai Lake, China

Habitat type as strongest predictor of the body size distribution of Chydorus sphaericus (O. F. Müller) in small water bodies

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