On the effect of marginal tree rows with respect to the management of small lowland streams

Krause, A.

doi:10.1016/0304-3770(77)90018-3

Cited by 20 publications

(7 citation statements)

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“…Hammill (1983) demonstrated the ability of Sparganium erectum to exert high retardation on discharge in a time-of-travel study in a reach of the R. Skerne, U.K., of similar width and gradient to the R. Tullamore Silver. The remarkable development of S. erectum, in the R. Tullamore Silver, within 6 months of completion of maintenance, echoes the concerns of Krause (1977) and Wade (1978) as to the real benefits of maintenance in weeded, lowgradient channels. In the R. Tullamore Silver, velocities were substantially higher in the open-water experimental site, in fully weeded conditions, than in the partially weeded 'open-water' areas in the other Sparganium zones.…”

Section: Discussionmentioning

confidence: 51%

“…Glyceria maxima is considered to be favoured over Phalaris in low velocity channels (Krause, 1977) whereas Phalaris can colonize a range of sediment types and tolerate flooding for short or long periods (Conchou & Pautou, 1987). The rapid development of Phalaris and negligible expression of G. maxima in the experimental site, compared to the more equal development of both in the standard maintenance sites, may be due to the substrate, depth regime and enhanced velocities in the experimental site.…”

Section: Discussionmentioning

confidence: 99%

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The impact of drainage maintenance strategies on the flora of a low gradient, drained Irish salmonid river

King

1996

Hydrobiologia

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In 1990, the Central Fisheries Board initiated research on how drainage maintenance practices and strategies might be modified to enhance the salmonid carrying capacity of the affected water while maintaining an acceptable degree of conveyance. Much of the maintenance requirement was caused by dense in-channel weed beds impeding discharge and facilitating siltation. The impact of various maintenance regimes on the aquatic flora was examined in the course of pilot studies on channels of base width 3-9 m. The findings from one of these, the R. Tullamore Silver which chokes annually with Sparganium erectum L., are presented. Overdigging the centre of the channel and placement of spoil at the margins confined S. erectum to a narrow marginal zone and facilitated development of a submerged, open-water flora.

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Section: Discussionmentioning

confidence: 51%

Section: Discussionmentioning

confidence: 99%

The impact of drainage maintenance strategies on the flora of a low gradient, drained Irish salmonid river

King

1996

Hydrobiologia

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“…The widespread removal of bankside trees in England and Wales, to assist maintenance and alleviate flooding, has been carried out largely in ignorance of any biological consequences. However tbe value of even these management practices has recently been questioned (Krause, 1977;Dawson, 1978). as bankside trees can substantially reduce the costs spent on removing macrophytes and preventing bankside erosion.…”

Section: Discussionmentioning

confidence: 99%

The input of terrestrial invertebrates from tree canopies to a stream

1982

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SUMMARY. The input of terrestrial invertebrates from different tree canopies to a trout stream was determined for a 28‐week period from April to October, 1980. Sycamore produced the greatest number of animals, followed by oak and alder. Ash was not significantly different from the controls. Coleoptera, Diptera, Homoptera and Arachnida made up the greatest number of animals caught, with Lepidoptera larvae important beneath oak. The input of biomass (g m‐2 dry wt) was also greatest beneath sycamore (35.80), followed by oak (27.76), alder (20.39), ash (11.15) and control (9.92). The input of biomass was bimodal. The significance of terrestrial invertebrates as food for salmonids is discussed.

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“…Krause, 1977;Dawson, , 1981Dawson and Kern-Hansen, 1978;Dawson and Haslam, 1983). Trees overhanging the channel limit light availability and so reduce aquatic plant Brookes (1988) growth (Templeton, 1984).…”

Section: Shadingmentioning

confidence: 93%

Fluvial maintenance operations in managed alluvial rivers

Darby

Thorne

1995

Aquatic Conservation

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ABSTRACT1. Fluvial maintenance is frequently undertaken to preserve the flood capacity, visual amenity, conservation value and geomorphic stability of managed river channels. Maintenance tasks include the management of both riparian and in-channel vegetation and maintenance dredging.2. Riparian vegetation is traditionally managed by physical methods such as cutting of grasses or removal of trees. Less environmentally severe alternative practices include grazing or shading for grasses, and practices such as pollarding or coppicing for trees.3. While a range of alternative maintenance practices, with varying environmental impact, are usually available for river managers to select, the potential for improving maintenance practices varies according to the particular task considered and the constraints imposed by the need to reach and maintain the target standard of service in terms of flood defence and land drainage.4. This review shows that economic and environmental impacts associated with fluvial maintenance operations may be reduced a t three scales. First, at the smallest scale, it is shown that there is often potential for improving the local operational efficiency of individual fluvial maintenance tasks. Second, it may be possible to reduce the intensity of maintenance in channel reaches which are presently over-serviced. Third, at the largest scale, it is shown that efficient maintenance is best achieved within the framework of Integrated Basin Management, and by giving appropriate consideration to future maintenance requirements a t the design stage of new projects to reduce the overall need for fluvial maintenance. Examples of the way in which these policies may be implemented to reduce environmental impact without compromising engineering objectives are illustrated through case studies from the UK and the USA.

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On the effect of marginal tree rows with respect to the management of small lowland streams

Cited by 20 publications

References 0 publications

The impact of drainage maintenance strategies on the flora of a low gradient, drained Irish salmonid river

The impact of drainage maintenance strategies on the flora of a low gradient, drained Irish salmonid river

The input of terrestrial invertebrates from tree canopies to a stream

Fluvial maintenance operations in managed alluvial rivers

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