The drift and its ecological significance. Experimental investigation onEcdyonurus venosus (Fabr.) in a stream model

Keller, Andres

doi:10.1007/bf02503409

Cited by 10 publications

(2 citation statements)

References 72 publications

(42 reference statements)

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“…When it Starts to move, the attached organisms get washed out and enter the drift. Dur ing this phase of a spate, a sharp increase in the density of drifting animals should take place, and indeed this has been recorded by several authors (Bailey 1966, Keller 1975, Hütte 1987. According to these assumptions, the insect drift during a flood should mainly consists of young larvae.…”

Section: Discussionmentioning

confidence: 58%

The influence of floods on benthic insect populations in a Swiss mountain stream and their strategies of damage prevention

Maier¹

2001

fal

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The influence of floods on benthic insect populations in a Swiss mountain stream and their strategies of damage prevention K.^J. Maier1 Wlth 5 figures and 3 tables Abstract: This paper describes flood induced changes of stream bed morphology and the effects of spates on the populations of dominant benthic insect taxa of a Swiss mountain stream (Kalte Sense, CH). The typical spates showed a steep increase of discharge, due to the topography of the catchment area. Within 6 hours the discharge may rise from 0.5 up to 20m3/s or more. During the 475 day study 45 floods were recorded of which 10 had discharges ranging from 15 to 25 m3/s. The floods which exceeded 15 m3/s caused large scale bed sediment movements and severe reductions in macroinvertebrate abundances. The effects of four flood situations on flve insect taxa (Heptageniidae, Baetidae, Leuctridae, Chironomidae, Simuliidae) were recorded and analysed. In general, young larvae were affected much more than the older stages. Therefore, the severity of the floods and the amount of bed sediment transport correlated strongest with the reduction in abundance of young larvae. Individual severe flood events reduced the insect fauna to 60% or even 27% of the preflood value, a series of severe floods in November 1992 resulted in a reduction to 8 %. However, dur ing the period from July to December, the insect populations usually recovered within 3 weeks and losses were compensated by young larvae which had just hatched.

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Section: Discussionmentioning

confidence: 58%

The influence of floods on benthic insect populations in a Swiss mountain stream and their strategies of damage prevention

Maier¹

2001

fal

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“…Phototactic responses may however complicate matters, where cool animals exhibit positive phototactic reactions and swim upwards towards a light source and warm organisms exhibit a negative phototactic reaction swimming away from a light source (Gerritsen, 1982). The amplitude of diel patterns of invertebrate drift may also be increased at warmer temperatures (Waters, 1972;Keller, 1975;Brittain and Eikeland, 1988), while catastrophic drift responses may result from drastic and sudden temperature changes (Ward and Stanford, 1982).…”

Section: Behavioural Effectsmentioning

confidence: 99%

Review: Sublethal effects of temperature on freshwater organisms, with special reference to aquatic insects

Dallas¹,

Ross‐Gillespie²

2015

WSA

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Water temperature is a key variable affecting aquatic organisms. Understanding their response to elevated water temperatures is important for estimating upper thermal limits, and ultimately for assisting with setting defendable, biologically-relevant water temperature guidelines for lotic systems. Sublethal effects impacting on an individual organism or species may manifest at higher levels of the hierarchy, namely, populations, communities and entire ecosystems. Sublethal effects typically include those affecting an organism's physiology and metabolism (e.g. growth rates, secondary productivity, respiration); phenology (e.g. development time, voltinism, emergence); reproductive success and fitness (e.g. fecundity, rates and success of egg development and hatching); behaviour (e.g. migration, movement, drift); and broad-scale ecological effects (e.g. species richness, composition, density, distribution patterns). Sublethal effects are discussed with examples drawn from freshwater studies, in particular those focused on aquatic insects. Commonly-used methods, which vary from simple, cost-effective, laboratory-based methods to more elaborate, expensive, laboratory-and field-based studies, are assimilated to serve as a toolbox for future thermal research. Ultimately, the method adopted depends largely on the question(s) being asked and available resources.

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Migrations and Distributions of Stream Benthos

Williams

1981

Perspectives in Running Water Ecology

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The drift and its ecological significance. Experimental investigation onEcdyonurus venosus (Fabr.) in a stream model

Cited by 10 publications

References 72 publications

The influence of floods on benthic insect populations in a Swiss mountain stream and their strategies of damage prevention

The influence of floods on benthic insect populations in a Swiss mountain stream and their strategies of damage prevention

Review: Sublethal effects of temperature on freshwater organisms, with special reference to aquatic insects

Migrations and Distributions of Stream Benthos

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