A Modified Freeze-Core Technique to Quantify the Depth Distribution of Fauna in Stony Streambeds

Pugsley, C. W.; Hynes, H. B. N.

doi:10.1139/f83-084

Cited by 46 publications

(38 citation statements)

References 15 publications

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“…He suggested that invertebrates were able to escape the advancing freeze-front, particularly in surface sediments (animals entered the drift), resulting in lower numbers and incorrectly reported patterns of depth distribution. In contrast, Pugsley & Hynes (1983) found no difference in horizontal distribution of invertebrates following freeze-coring in prepared cages. Given that our data analysis did not include results from the top 15 cm of cores, which Bretschko (1985) identified as most susceptible to escape reactions, we suggest that the increased effort required for electro-positioning was not warranted in our study.…”

Section: Limitations Of Hyporheic Sampling Methodsmentioning

confidence: 61%

“…Several authors have suggested that the effectiveness of freeze-coring as a sampling method can be increased by allowing a settling period after standpipes are implanted (e.g., Pugsley & Hynes 1983), and by electro-positioning of animals before freezing (e.g., Bretschko & Klemens 1986). Bretschko (1985) showed that numbers of invertebrates in cores were higher after electro-positioning than before.…”

Section: Limitations Of Hyporheic Sampling Methodsmentioning

confidence: 99%

“…Several sampling methods have been developed, and there have been a number of reviews addressing the advantages and disadvantages of these methods (e.g., Pugsley & Hynes 1983;Bretschko & Klemens 1986;Fraser & Williams 1997;Pusch et al 1998;Hunt & Stanley 2000). However, most comparisons of hyporheic sampling methods have been carried out at a single site and usually on a single occasion (e.g., Fraser & Williams 1997), and the effects of sampling method on determination of patterns in space and time have not usually been addressed (Palmer 1993).…”

Section: Introductionmentioning

confidence: 99%

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Detecting patterns in hyporheic community structure: Does sampling method alter the story?

Scarsbrook¹,

Halliday²

2002

New Zealand Journal of Marine and Freshwater Research

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Hyporheic invertebrates were sampled in six small headwater streams draining pine, pasture, and native forest catchments. Sites were sampled in autumn and spring using three different hyporheic sampling methods (colonisation pots, pump sampling, and freeze-coring). Total invertebrate abundance and taxon richness differed significantly among sites on both sampling occasions for pump samples, whereas freeze-coring did not discriminate among sites, and pot samples showed significant differences in autumn, but not in spring. Differences among sites with respect to community composition were not consistent between sampling methods. Community ordination indicated that samples from colonisation pots tended to group together, whereas pump and freeze core samples were widely separated. Differences across land uses were also apparent (native forest sites formed a distinct cluster separated from pine and pasture sites). Results suggest that colonisation pots may provide a pathway for the entry of epigean organisms into the hyporheic zone even when hydraulic connectivity between surface and hyporheic zones is low. Invertebrate abundance was very low in pump samples, and this method also captured the fewest taxa of the three methods. The size bias known to exist with pump sampling techniques may restrict the usefulness of the method when comparing streams of differing hydraulic conductivity.

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Section: Limitations Of Hyporheic Sampling Methodsmentioning

confidence: 61%

Section: Limitations Of Hyporheic Sampling Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Detecting patterns in hyporheic community structure: Does sampling method alter the story?

Scarsbrook¹,

Halliday²

2002

New Zealand Journal of Marine and Freshwater Research

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“…In contrast, more conventional coring approaches performed poorly due to the very large grain sizes often encountered. The freeze coring technique, although used in hyporehic zone or lake bed research in other contexts (Pugsley and Hynes, 1983), appears under used in contaminated groundwater discharge studies. Grab samples of the sand lenses and intermediate depth drive tube cores were also taken for organic matter measurements.…”

Section: Field Site and Instrumentationmentioning

confidence: 99%

Heterogeneous hyporheic zone dechlorination of a TCE groundwater plume discharging to an urban river reach

Freitas

Rivett

Roche

et al. 2015

Science of The Total Environment

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This version is available at https://strathprints.strath.ac.uk/62331/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the AbstractThe typically elevated natural attenuation capacity of riverbed -hyporheic zones is expected to decrease chlorinated hydrocarbon (CHC) groundwater plume discharges to river receptors through dechlorination reactions. The aim of this study was to assess physico-chemical processes controlling field-scale variation in riverbed -hyporheic zone dechlorination of a TCE groundwater plume discharge to an urban river reach. The 50-m long pool -riffle -glide reach of the River Tame in Birmingham (UK) studied is a heterogeneous high energy river environment. The shallow riverbed was instrumented with a detailed network of multilevel samplers. Freeze coring revealed a geologically heterogeneous and poorly sorted riverbed. A chlorine number reduction approach provided a quantitative indicator of CHC dechlorination. Three sub-reaches of contrasting behaviour were identified. Greatest dechlorination occurred in the riffle sub-reach that was characterised by hyporheic zone flows, moderate sulphate concentrations and pH, anaerobic conditions, low iron, but elevated manganese concentrations with evidence of sulphate reduction. Transient hyporheic zone flows allowing input to varying riverbed depths of organic matter is anticipated to be a key control. The glide sub-reach displayed negligible dechlorination attributed to the predominant groundwater baseflow discharge condition and absence of hyporheic zone, transition to more oxic conditions and elevated sulphate concentrations expected to inhibit dechlorination. The tail-of-pool-riffle sub-reach exhibited patchy dechlorination that was attributed to sub-reach complexities including significant flow bypass of a low permeability, high organic matter, silty unit of high dechlorination potential. A process-based conceptual model of reach-scale dechlorination variability was developed. Key findings of practitioner relevance were: riverbed -hyporheic zone CHC dechlorination may provide only a partial, patchy barrier to CHC groundwater plume discharges to a surface water receptor; and, monitoring requirements to assess the variability in CHC attenuation within a reach are expected to be onerous. Further research on transient hyporheic zone dechlorination is...

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“…The vertical distribution of invertebrates is known to show different patterns in different streams (e.g., WILLIAMS and HYNES, 1974;PUGSLEY and HYNES, 1983). In the Loučka River more than three quarters of all invertebrates were found in the first 20 cm of the substratum.…”

Section: General Features Of Vertical Distributionmentioning

confidence: 99%

Vertical Distribution of Invertebrates in Bed Sediments of a Gravel Stream in the Czech Republic

Omesová¹,

Helešic²

2007

International Review of Hydrobiology

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The vertical distribution of invertebrates in bed sediments was studied in a gravel stream in the hercynian region of Central Europe, using freeze-cores to the depth of 70 cm at two sites with different flow conditions, taken on five occasions. About 78% of invertebrates were concentrated in the upper 20 cm layer. The invertebrate communities at the two sites varied in abundance, diversity, vertical distribution and stability of vertical distribution with time. Densities of invertebrates were not limited by fine grain content and showed a site-specific relationship with organic carbon content. Depth optima of invertebrates were negatively correlated with surface water temperature, but not with measured hydraulic parameters. Among individual taxa, Nematoda showed the deepest depth optimum.

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A Modified Freeze-Core Technique to Quantify the Depth Distribution of Fauna in Stony Streambeds

Cited by 46 publications

References 15 publications

Detecting patterns in hyporheic community structure: Does sampling method alter the story?

Detecting patterns in hyporheic community structure: Does sampling method alter the story?

Heterogeneous hyporheic zone dechlorination of a TCE groundwater plume discharging to an urban river reach

Vertical Distribution of Invertebrates in Bed Sediments of a Gravel Stream in the Czech Republic

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