Temporal Responses of the Macrophyte, Potamogeton perfoliatus L., and Its Associated Autotrophic Community to Atrazine Exposure in Estuarine Microcosms

Cunningham, Jeffrey J.; Kemp, W. Michael; Lewis, Marlon R.; Stevenson, J. Court

doi:10.2307/1352057

Cited by 38 publications

(18 citation statements)

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“…Response patterns vary for different compounds, but there is a general concern that the homeostatic nature of ecosystem metabolism makes these rates poor indicators of low-level ecosystem stress (e.g., Taub, 1993). In contrast, herbicide addition to sea grass-dominated mesocosms resulted in sharp declines in ecosystem production (P a ) that abated within weeks as herbi cides degraded (e.g., Cunningham et al, 1984). In contrast, herbicide addition to sea grass-dominated mesocosms resulted in sharp declines in ecosystem production (P a ) that abated within weeks as herbi cides degraded (e.g., Cunningham et al, 1984).…”

Section: Metabolic Response To Perturbationmentioning

confidence: 99%

Metabolic Balance between Ecosystem Production and Consumption

Kemp

Testa

2011

Treatise on Estuarine and Coastal Science

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Section: Metabolic Response To Perturbationmentioning

confidence: 99%

Metabolic Balance between Ecosystem Production and Consumption

Kemp

Testa

2011

Treatise on Estuarine and Coastal Science

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“…Seventy-five pots each planted with a single shoot were then transferred to each of the 12 experimental aquaria filled with dechlorinated tap water. The volume of the aquarium was large enough to maintain approximately the same stem density per square meter as adopted by Cunningham et al (1984). Two light intensities were used: 200 lE m -2 s -1 as the high light and 80 lE m -2 s -1 as the low light intensity at 1 cm above the water surface.…”

Section: Methodsmentioning

confidence: 99%

Morphological responses of a submerged macrophyte to epiphyton

et al. 2009

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Epiphyton might have distinctive influence on the morphology of substrate macrophyte. In this article, we evaluate the influence of epiphyton on the morphological characteristics of their substrate submerged macrophyte, Potamogeton perfoliatus under two light intensities. The experiment was carried out for a period of 84 days in 12 glass aquaria under laboratory conditions. It was based on a 2 9 2 factorial design with epiphyton status (present or absent) and light intensity (200 or 80 lE m -2 s -1 ). Both epiphyton and light intensity had significant effects on the morphology and biomass allocation of the experimental plants. The average number of leaves, total length of newly recruited shoots and diameter of stems were greater in the epiphyton-free control plants than in the epiphyton-colonized plants under low light conditions. The plants with epiphyton allocated more biomass in their rhizomes and roots (% relative to total biomass basis) when compared to the control plants in both light intensities. There were also significant epiphyton-light interactions. The control plants under low light intensity showed higher internodal elongation in their main shoots when compared to the plants under high light intensity as an adaptation mechanism. Whereas the plants with epiphyton did not show such an adaptation. The new shoots of the control plants under low light intensity did not show any internodal elongation as observed in the main shoots. Furthermore, the length of the leaves of main shoots was larger in control plants with epiphyton and high light intensity than in plants with epiphyton and low light intensity, but such a variation was absent in the new shoots. We conclude that the long-term colonization by epiphyton and their shading effects induced the observed morphological changes in plants.

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“…For example, Wiegner et al (2003) reported that ecosystem production was significantly stimulated by nutrients and inhibited by metal toxins, while input of both sets of chemicals resulted in slight enhancement of gross and net production. Herbicide additions to seagrass-dominated mesocosms resulted in sharp declines in production that diminished within weeks as the herbicides degraded (Cunningham et al, 1984). In Chapter 11, Benfield reports on both acute and lethal impacts of toxins on zooplankton.…”

Section: Toxinsmentioning

confidence: 99%