Downstream effect of impoundments on stoneflies: Case study of an epipotamal reach of the Jihlava river, Czech Republic

Helešic, Jan; Sedlák, Edmund

doi:10.1002/rrr.3450100104

Cited by 12 publications

(6 citation statements)

References 12 publications

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“…Baetis lutheri). Distinctive production patterns regarding benthic macroinvertebrates and comparable results to Helesic & Sedlak (1995) were found by Buffagni & Comin (2000) and Buffagni (2001) for Italian rivers, leading to the concept of functional habitats (e.g. riffles and pools).…”

Section: Identification Of Benthic Drift Sources and Sinkssupporting

confidence: 56%

Hydro-morphologically related variance in benthic drift and its importance for numerical habitat modelling

et al. 2011

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Numerical fish-habitat modelling on various scales is considered to be state of the art in river management. However, most of the concepts applied use steady-state hydraulic parameters such as flow velocity and water depth. Herein we present analysis and discussion of the possibility of including a driftfeeding parameter (SI F ) into habitat evaluations based on multiplying suitability indices. ''Sources'' and ''sinks'' of benthic drift were identified according to both the zero-crossing and hydraulic-threshold methods in an alpine gravel-bed river. Minor differences could be determined between the two methods in a well-developed riffle-pool section. Macroinvertebrates, used for simulating benthic drift, were collected by multi-habitat sampling and appraised according to their critical threshold (s cr ) for motion on the bed surface and sinking velocity (v s ). The findings of the calculation of drift rates using one-(1D) and twodimensional (2D) hydrodynamic numerical models highlight a specification of best feeding position for drift-feeding fish (i.e. brown trout, grayling) considering the SI F parameter. Riffle-pool sequences are characteristic of pristine alpine streams; our findings underline their importance as production (riffles) and consumption areas (pools) in terms of holistic river function. Moreover, the results indicate that (artificial) lateral obstruction (e.g. dams) may lead to a reduced transport rate of benthic organisms due to low bottom shear stress (\0.25 N m -2 ). Thus, deposition of drifting macroinvertebrates occurs in backwaters, with downstream impacts on benthic and fish communities.

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Section: Identification Of Benthic Drift Sources and Sinkssupporting

confidence: 56%

Hydro-morphologically related variance in benthic drift and its importance for numerical habitat modelling

et al. 2011

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“…Armitage et al (1987) also noted that two stonefly families, Leuctridae and Nemouridae, were unaffected by regulation in the UK. Helesic and Sedlak (1995) recorded an increase in the number of stonefly species and abundance in the Czech Republic following regulation of a river. However, the river was affected by organic pollution before regulation and the pollution decreased following the damming of the river.…”

Section: Discussionmentioning

confidence: 98%

Ecological effects of flow regulation on macroinvertebrate and periphytic diatom assemblages in the Hawkesbury–Nepean River, Australia

Growns

2001

Regul. Rivers: Res. Mgmt.

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The effects of flow regulation on macroinvertebrates and periphytic diatoms were examined in the HawkesburyNepean River system in Australia. Regulated sites below eight dams or weirs were compared with unregulated sites above the impoundments and sites on two nearby unregulated streams. The management of the water supply during the study created two types of flow regulation, sites with water supply releases and sites with comparatively small or no releases. The macroinvertebrate communities in three habitats and periphytic diatoms below the storages and weirs differed from the biota at unregulated sites above the weirs and on unregulated systems. The number of macroinvertebrate taxa in riffle and pool-rock assemblages was significantly lower at regulated sites when compared with unregulated sites and the number of stream edge macroinvertebrate and diatom taxa was unaffected by regulation. Riffle and pool-rock macroinvertebrate assemblages differed between the two types of regulation. However, periphytic diatom and edge habitat macroinvertebrate assemblages did not differ between the two types of flow regulation. Examination of environmental variables associated with the change in the biota suggested that the principal effect of the management of the water supply system in the Hawkesbury-Nepean River was changed hydrology rather than altered water quality.

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“…Macrophyte development results in a biodiversity peak due to diverse habitat conditions along pronounced lateral and vertical, and trapped organic material from the margin toward the center of the macrophyte patch. In comparison, invertebrate diversity is significantly lower in submerged macrophyte patches located in pools, due to the absence of high-flow microhabitats at the patch margin (Helesic & Sedlak, 1995). In contrast to riffles and runs, pools, glides, recirculation zones, and point bars are characterized by lower velocity and bed shear stress, as well as finer sediments.…”

Section: Linkages Between Habitat Heterogeneity and Biodiversitymentioning

confidence: 98%

Complex hydromorphology of meanders can support benthic invertebrate diversity in rivers

2011

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In freshwater environments, high biodiversity is commonly associated with habitat heterogeneity. River bends and meanders are particularly complex morphodynamic elements of watercourses. However, the specific spatio-temporal interactions between hydromorphology and the resident biota have scarcely been studied. This article reviews the relationships between hydraulic processes, and morphological units that are typical for meanders, and analyzes the concomitant spatial and temporal dynamics of habitats suitable for aquatic invertebrates. Flow in river bends is characterized by significant crossstream velocities, which modify primary flow patterns, and create helical flow trajectories. Consequently, boundary shear stresses at the river-bed are altered, so that complex erosion, transport, and accumulation processes characteristically shape bed and bank morphology. The diversity of substrate types and complex bathymetry in meanders provide a large variety of habitat conditions for benthic invertebrates within a relatively small spatial domain, which are connected via hydraulic pathways. Periodic reversal of hydromorphological processes between low and high flow, and seasonal growth of aquatic macrophytes creates spatio-temporal dynamics at the meso-and microhabitat scales. Such habitat dynamics increases benthic invertebrate diversity to the extent it is consistent with spatio-temporal scales of invertebrate mobility and life cycle. Furthermore, the presence of flow refugia, and hydraulic dead zones in meanders is essential to sustain species richness. This study concludes that meanders are highly complex morphodynamic elements that exhibit several self-regulating principles supporting invertebrate diversity and resilience in fluvial ecosystems.

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Downstream effect of impoundments on stoneflies: Case study of an epipotamal reach of the Jihlava river, Czech Republic

Cited by 12 publications

References 12 publications

Hydro-morphologically related variance in benthic drift and its importance for numerical habitat modelling

Hydro-morphologically related variance in benthic drift and its importance for numerical habitat modelling

Ecological effects of flow regulation on macroinvertebrate and periphytic diatom assemblages in the Hawkesbury–Nepean River, Australia

Complex hydromorphology of meanders can support benthic invertebrate diversity in rivers

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