28 Result(s)
within
Christopher T Robinson
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Article
Effects of physical disturbance and canopy cover on attached diatom community structure in an Idaho stream
A field experiment was conducted to determine the effect of disturbance frequency on diatom communities established on artificial substrates within an open canopy site and a closed canopy site of a 3rd order s...
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Benthos and macroinvertebrate drift in six streams differing in alkalinity
The productive capacity of aquatic systems often is equated with the ‘chemical richness’ of the water. A primary objective of the present study was to relate macroinvertebrate benthos and drift to a streams' p...
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Genetic differentiation of Baetis alpinus Pictet (Ephemeroptera: Baetidae) in fragmented alpine streams
The interpretation of low FST values as evidence of high levels of gene flow among habitat fragments may be confounded by population genetic structures that are indicative of historical rather than present-day le...
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Development of Macroinvertebrate-Based Index for Bioassessment of Idaho Rivers
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Longitudinal effects of experimental floods on stream benthos downstream from a large dam
We examined the longitudinal effects of 3 experimental floods on seston, periphyton, and macroinvertebrates in a regulated river downstream from a large reservoir in the Swiss Alps. In addition, suspended orga...
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Using artificial floods for restoring river integrity
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Effects of a multi-year experimental flood regime on macroinvertebrates downstream of a reservoir
We examined the response of stream macroinvertebrates to a multiple-year experimental flood regime downstream of a large reservoir. Benthic samples were collected from the River Spöl prior to the initial flood...
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Macroinvertebrate diversity in fragmented Alpine streams: implications for freshwater conservation
Lakes and reservoirs disrupt the longitudinal connectivity of streams, considerably affecting benthic macroinvertebrate assemblages and diversity. Changes in assemblage composition within fragments can result ...
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Benthic diatoms of an Alpine stream/lake network in Switzerland
We compared the benthic diatom composition of lakes, and lake inlet and outlet streams in a high elevation catchment (∼2600 m a.s.l.) in the Swiss Alps. The catchment consisted of a southern basin mostly fed b...
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Benthic diatoms of an Alpine stream/lake network in Switzerland
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Article
Invertebrate and microbial responses to inundation in an ephemeral river reach in New Zealand: effects of preceding dry periods
Inundation marks the shift from a terrestrial ecosystem to an aquatic ecosystem in ephemeral rivers. The forms and rates of responses by aquatic invertebrates and sediment microbes to inundation depend on desi...
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Article
Open AccessBottlenecks drive temporal and spatial genetic changes in alpine caddisfly metapopulations
Extinction and re-colonisation of local populations is common in ephemeral habitats such as temporary streams. In most cases, such population turnover leads to reduced genetic diversity within populations and ...
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Spatial patterns in macroinvertebrate assemblages in surface-flowing waters of a glacially-influenced floodplain
We examined the spatial structure of macroinvertebrate assemblages in surface-flowing waters of a glacially-influenced floodplain. The floodplain main-channel responded longitudinally to changes in hydrology w...
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The hydro-morphological index of diversity: a tool for describing habitat heterogeneity in river engineering projects
We present a new hydro-morphological index of diversity (HMID), a tool aimed for use in river engineering projects and firstly developed at gravel-bed streams in Switzerland, but intended for a broader use. We...
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Shifts in isotopic signatures of animals with complex life-cycles can complicate conclusions on cross-boundary trophic links
Stable isotopes (13C and 15N) are widely applied in studies of trophic links. We used this method to investigate the contribution of aquatic and terrestrial prey to the diet of riparian predatory arthropods in tw...
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Spatio-temporal shifts of macroinvertebrate drift and benthos in headwaters of a retreating glacier
Recent alpine stream studies have aimed to predict biotic responses to changing environmental conditions, hydrological regime and climate, but there is little information on macroinvertebrate drift shifts in ...
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Spatio-temporal relationships between habitat types and microbial function of an upland floodplain
Natural floodplains comprise a spatial mosaic of habitat types that vary in successional development. The physical–chemical properties of soils and sediments in these habitats vary spatio-temporally with chang...
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Open AccessDistribution and population genetic variation of cryptic species of the Alpine mayfly Baetis alpinus (Ephemeroptera: Baetidae) in the Central Alps
Many species contain evolutionarily distinct groups that are genetically highly differentiated but morphologically difficult to distinguish (i.e., cryptic species). The presence of cryptic species poses signif...
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Article
Short-term colonization dynamics of macroinvertebrates in restored channelized streams
Macroinvertebrate colonization of restored rivers is a function of dispersal into the restored reach and its suitability for population establishment. To maximize potential for colonization success, spatial co...
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Changes in macroinvertebrate trophic structure along a land-use gradient within a lowland stream network
Running waters are among the most threatened ecosystems globally, having altered hydrological regimes, homogenized habitat, and impaired water quality. These multiple stressors impact aquatic biodiversity and ...
