Journal Article10.1002/RRR.3450030116
Serial discontinuities in a Rocky mountain river. I. Distribution and abundance of plecoptera
Jack A. Stanford,James V. Ward +1 more
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TL;DR: In this paper, the authors studied the distribution of the Plecoptera and evaluated responses to hypolimnial-release dams in the headwaters and middle reaches of the Gunnison River.
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Abstract: Samples were taken year-round at eleven sites along the altitudinal profile (2900-1400 m a.s.l.) of the Gunnison River, a 329 km tributary of the Colorado River, to document the distribution of the Plecoptera and to evaluate responses to hypolimnial-release dams in the headwaters and middle reaches. Twenty-two species were present, with the greatest species richness occurring in an unregulated segment upstream of the middle reach dams; average nymphal biomass over the study period (175 organisms, 395 mg dry mass m−2) was also greatest in this segment. Only four species (58 organisms, 48 mg m−2) were present in the tailwaters of the headwater dam and values were greatly reduced (nine species; 35 organisms, 180 mg m−2) below the middle reach dams. The stonefly community recovered ca. 80 km downstream from the last dam (15 species; 244 organisms, 250 mg m−2), apparently in response to natural resetting of environmental conditions corresponding to those above the middle reach dams. At the most downstream site (11) only four species (four organisms, 16 mg m−2) were present. The observed distributional pattern is a classic serial discontinuity in response to hypolimnial stream regulation in a temperate latitude river.
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Citations
A general protocol for restoration of regulated rivers
Jack A. Stanford,James V. Ward,William J. Liss,Christopher A. Frissell,Richard N. Williams,James A. Lichatowich,Charles C. Coutant +6 more
TL;DR: In this article, the authors proposed a management belief system that relies upon natural habitat restoration and maintenance, as opposed to artificial propagation, installation of artificial instream structures (river engineering) and predator control.
Longitudinal trends in regulated rivers: a review and synthesis within the context of the serial discontinuity concept
TL;DR: In this paper, the authors provide evidence for SDC predictions on physical, chemical, and biological recovery in regulated rivers and determine how these changes are reflected in the benthic community.
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Influence of mild to severe flow alterations on invertebrates in three mountain streams
TL;DR: Invertebrates appeared resilient to mild flow alterations as neither the abundance, diversity, nor spatial and temporal variation in abundance and diversity differed upstream versus downstream during either period, but in severely diverted streams, total invertebrate density downstream from the diversion was only 50% of upstream.
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Serial discontinuities in a Rocky mountain river. II. Distribution and abundance of trichoptera
TL;DR: In this article, the authors found that river regulation in the headwaters and middle reaches of the Gunnison River, Colorado, significantly altered distributions and abundances of trichoptera fauna.
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•Journal Article
Ecological impacts of small dams on South African rivers Part 2: Biotic response - abundance and composition of macroinvertebrate communities
TL;DR: The results of this study highlight the need for a systematic and detailed collection of data to verify the results of cumulative effects of small dams to further the development of a framework for small-dam construction and management that will limit their impact on river catchments.
References
The River Continuum Concept
TL;DR: It is hypothesized that producer and consumer communities characteristic of a given river reach become established in harmony with the dynamic physical conditions of the channel.
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Predator-Prey Interactions between Stoneflies and Mayflies: Behavioral Observations
TL;DR: None of the species of mayflies tested responded to the presence of stonefly predators given only visual stimuli, and the Ephemerella species assumed a "scorpion"-like display posture upon encounter with the stoneflies, which may increase the apparent size of the mayflies which are then rejected by the tactile predators.
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