Comparative Productivity of Four Carolina Lakes

Tilly, L.J.

doi:10.2307/2424459

Cited by 17 publications

(6 citation statements)

References 5 publications

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“…The reservoir was created in 1958 by the impoundment of Lower-Three-Runs Creek for the purpose of receiving heated water from nuclear reactors. Limnologically, PAR is a relatively shallow, softwater, mesotrophic system with a well-developed littoral zone (Tilly 1973, Grace 1977. The emergent vegetation of PAR is dominated by TL and TD though many other species are present.…”

Section: Field Observationsmentioning

confidence: 99%

The Impact of Preemption on the Zonation of Two Typha Species Along Lakeshores

Grace¹

1987

Ecological Monographs

115

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The objective of this study was to examine the effects of preemption on rates of competitive displacement and on competitive outcomes for two Typha species (T. latifolia, TL, and T. domingensis, TD) growing along gradients of water depth. Evidence from several experiments indicated that the relative competitive abilities of the two species were size dependent. When TL and TD competed as small seedlings, TD was generally favored while TL was the better competitor when the plants were larger before beginning to compete. Because of this effect, initial density was determined to influence strongly the early outcome of competition. When seeds were sown at high densities, TD gained an early advantage; at lower densities TL was the better competitor. At very low densities, such as when the species competed as clones, TL was very much the better competitor. In the absence of preemption, the results showed that differences in germination, seedling growth, and competitive ability act to create an initial segregation of species at the waterline where establishment occurs. TL is upslope and TD downslope initially, but as the species spread downslope, TL progresses faster because of its greater capacity for vegetative spread, and the result is a widespread overlap along the gradient. Studies of the rate of competitive displacement between established plants yielded an estimate of slightly <6 yr required for complete segregation of two species starting from maximum overlap. Preemption had a strong effect on early growth and distribution of the species. After the initial effects of temporal disadvantage, delayed plants were able to recover under certain circumstances. Both species recovered better in shallow water than in deep water, and, in general, TL recovered better than did TD. Experiments on spatial preemption found that the species moved towards the expected segregation of TL upslope and TD downslope regardless of the initial conditions. This process of recovery was somewhat slower for established stands of adults than for seedlings. Comparison of aerial photographs of natural populations of TL and TD in PAR Pond (South Carolina) in 1980 with distributions in 1984 also suggests that recovery from even large—scale spatial preemption can occur over only a few years time. These results suggest that extreme temporal advantage by either species can lead to extinction of the other species and that the magnitude of the effect depends upon the initial density of seedlings. If both species survive the initial phase of competition and the habitat remains undisturbed, subsequent vegetation spread and competitive displacement can over—come the initial effects of spatial and temporal preemption, resulting in a predictable zonation.

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Section: Field Observationsmentioning

confidence: 99%

The Impact of Preemption on the Zonation of Two Typha Species Along Lakeshores

Grace¹

1987

Ecological Monographs

115

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“…The death of organisms which are entrained in the cooling water, as well as the physical and chemical action of the temperatures in the heatexchange system (> 80°C) are likely to cause changes in both nutrient quality and quantity as well as increases in amounts of suspended material. (39) and based on samples taken from the unheated portion of Par Pond during June-August, 1967. Water quality data are from the euphotic zone .…”

Section: Disclaimermentioning

confidence: 99%

“…Marshall and Tilly (19) and Tilly (39,40) have examined the primary productivity of phytoplankton and periphyton in Par…”

Section: Disclaimermentioning

confidence: 99%

Distribution and abundance of submerged aquatic macrophytes in a reactor cooling reservoir

Grace¹

1977

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“…1). Heat distribution patterns and water quality parameters in the reservoir have been reported elsewhere (Lewis, 1974;Tilly, 1973).…”

Section: Methodsmentioning

confidence: 97%

Relationship of season, thermal loading and red‐sore disease with various haematological parameters in Micropterus salmoides

Hazen

Esch

Glassman

et al. 1978

Journal of Fish Biology

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One hundred and fifty largemouth bass (Micropterus salmoides) were caught during the mid-winter and mid-summer months in Par Pond, an 1120 ha cooling reservoir located on Savannah River Plant near Aiken, SC. Equal numbers of fish were taken from ambient and thermally altered (> 10" C ambient) areas of the lake. The total length and weight of each bass was noted, along with the presence or absence of lesions associated with red-sore disease (caused by the bacterium, Aeromonas hydrophila and the ciliate, Epistylis sp.). Blood was drawn, by heart puncture, from each bass and the following haematological parameters measured: haematocrit, haemoglobin, iron, total iron-binding capacity, thyroxine, sodium and potassium. Only the total iron-binding capacity was significantly higher in bass with red-sore disease; none of the other blood parameters were significantly different in infected and uninfected bass. Bass from thermally altered locations had consistently higher haematocrits during both summer and winter. Bass from thermal and ambient locations were not different with respect to iron, iron-binding capacity, sodium or potassium levels. However, bass taken during summer months had higher levels of circulating iron than individuals in winter months. Summer bass had higher thyroxine levels than bass in winter. These results are discussed in terms of their relationship to red-sore disease, season and the impact of thermal effluent.

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Comparative Productivity of Four Carolina Lakes

Cited by 17 publications

References 5 publications

The Impact of Preemption on the Zonation of Two Typha Species Along Lakeshores

The Impact of Preemption on the Zonation of Two Typha Species Along Lakeshores

Distribution and abundance of submerged aquatic macrophytes in a reactor cooling reservoir

Relationship of season, thermal loading and red‐sore disease with various haematological parameters in Micropterus salmoides

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