Benthic assemblage variation among channel units in high-gradient streams on Vancouver Island, British Columbia

Halwas, Karen L.; Church, Michael; Richardson, John S.

doi:10.1899/02-075.1

Cited by 31 publications

(20 citation statements)

References 37 publications

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“…These patterns of lower macroinvertebrate densities and biomass in intermittent streams and after severe droughts have been described elsewhere (Feminella, 1996;Gasith & Resh, 1999;del Rosario & Resh, 2000;Muñoz, 2003Halwas et al, 2005;Bêche et al, 2006). In addition, macroinvertebrate taxa were generally smaller in the intermittent reach (e.g.…”

Section: Differences In the Fish Assemblagesupporting

confidence: 76%

“…Neither whole stream fertilization experiments conducted in Fuirosos intermittent stream had bottom-up effects in its detritus based food web . Although higher macroinvertebrate density and biomass could result from flow permanence (del Rosario & Resh, 2000;Muñoz, 2003;Halwas et al, 2005) and nutrient availability (Cross et al, 2006), macroinvertebrates from intermittent streams possess life traits that enable them to cope with streambed drying (Bonada et al, 2007).…”

Section: Differences In the Fish Assemblagementioning

confidence: 99%

“…Surface water disappearance in intermittent streams represents a critical stage that negatively affects survival and nextyear recruitment of taxa that have limited mobility, those whose aquatic stage is longer than 1 year, as well as those lacking desiccation-resistant stages (Boulton & Lake, 1992;Boulton, 2003;Acuña et al, 2005;Bêche et al, 2006;Bêche & Resh, 2007). Compared to permanent rivers, intermittent streams have macroinvertebrate assemblages with lower densities, biomasses and productions, as well as smaller individuals for a given taxon and smaller-bodied taxa with shorter generation times (del Rosario & Resh, 2000;Muñoz, 2003;Halwas et al, 2005;Chadwick & Huryn, 2005Bonada et al, 2007). Optimal foraging theory predicts that prey selection is determined by the relative profitability of particular types and sizes of prey (Pyke, 1984).…”

Section: Introductionmentioning

confidence: 99%

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Comparing fish assemblages and trophic ecology of permanent and intermittent reaches in a Mediterranean stream

et al. 2010

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Mediterranean streams are characterised by seasonal droughts, the frequency and intensity of which vary spatially and are expected to increase with global change. We studied the potential effects of drought and climate change on the fish assemblage and its trophic ecology in a Mediterranean stream by comparing an intermittent tributary with two more permanent neighbouring reaches. Although the three sites were dominated by the same two fish species, Mediterranean barbel (Barbus meridionalis) and chub (Squalius laietanus), the intermittent tributary had a lower overall fish density and fewer eel (Anguilla anguilla). The intermittent tributary had macroinvertebrates with lower density, smaller taxa and higher diversity. Fish in the intermittent tributary had significantly lower biomasses in their gut contents (adjusted for fish length) and more negative electivities than those in the permanent reaches, as well as significantly lower taxonomic diversity. These results indicate that there was reduced resource availability in the intermittent tributary, which resulted in significantly lower condition and gonadal weight (adjusted for length) of barbel and chub. The data obtained in this Mediterranean stream support the observation that reduced water flow may affect fish at both individual and assemblage levelsThis study was financially supported by projects CGL2007-65549/BOS, CGL2008-05618-C02-02, CGL2009-12877-C02-01 and Consolider-Ingenio 2010 CSD2009-00065 of the Spanish Ministry of Science. Catalan Water Agency, the Government of Catalonia and the Barcelona Provincial Council (‘Observatori de la Tordera’

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Section: Differences In the Fish Assemblagesupporting

confidence: 76%

Section: Differences In the Fish Assemblagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparing fish assemblages and trophic ecology of permanent and intermittent reaches in a Mediterranean stream

et al. 2010

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“…Periods of high flow (spates) are one of the most important disturbances in streams (Resh et al, 1988), and differences in community composition associated with stream gradient are often attributed to flow or disturbance (Grubaugh et al, 1996;Halwas et al, 2005). In the study streams, exposed substrate averages more than 20 cm maximum dimension, large boulders (ca.…”

Section: Discussionmentioning

confidence: 99%

Disturbance, fish, and variation in the predatory insect guild of coastal streams

Sircom

Walde

2008

Hydrobiologia

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Species distributions, and thus the composition of communities, are determined by many interacting biotic and abiotic factors. We analyzed the variation in composition of the invertebrate predator guild across eight small, steep coastal streams in eastern Canada, in relation to variation in several broad categories of environmental variables: disturbance-related physical characteristics, top-down effects (fish), and bottom-up effects (prey composition and productivity-related physical/chemical variables). Similarity in composition (relative and absolute abundances of the 19 species belonging to the Rhyacophilidae, Perlodidae, and Chloroperlidae) declined significantly with distance. Streams that were most similar in predator composition were also most similar in physical factors related to disturbance, but were not more similar in prey abundance/composition or in environmental factors associated with productivity (chemistry, canopy cover, and riparian forest type).Similarity in the relative abundance of species within the Rhyacophilidae was linked to variation in the presence/abundance of brook trout. These results suggest that the invertebrate predator guilds of these small coastal streams are structured first and foremost by factors associated with the magnitude and variability of the flow regime, and second by response to topdown factors (predation by brook trout). There was no evidence that bottom-up effects altered the composition or abundance of the predator guild.Electronic supplementary material The online version of this article (

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“…Interaction of flow velocity and substrate forms two basic habitat types-riffles/run/steps in streams with swift current, mostly gravel substrate; and pools with slow current and fine substrate (Cummins 1964;Wetzel 2001). Generally, diversity, abundance and biomass is higher in riffles/steps (Brown & Brussock 1991;Wohl et al 1995;Kobayashi & Kagaya 2002;Buss et al 2004;Schmera & Erős 2004;Halwas et al 2005), however, de- tritus is also important determinant (Buss et al 2004). The aim of this study was to analyse macroinvertebrate communities longitudinal-downstream variability between two different morphological sequences -shallow (riffle/run/step) and deeper (pool) channelbed morphological units of 15 sampling sites representing seven different functional process valley segments in two seasons of the year (spring and autumn).…”

Section: Introductionmentioning

confidence: 99%

Testing for longitudinal zonation of macroinvertebrate fauna along a small upland headwater stream in two seasons

et al. 2016

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The effect of longitudinal zonation patterns and macroinvertebrate responses to changes in habitat characteristics have been given a lot of attention. But studies of changes in macroinvertebrate assemblages along small upland undisturbed watercourses are still lacking. The aim of the study is to analyse variability in macroinvertebrate communities between two different habitats/morphological sequences -shallow (riffle/run/step/) and deeper (pool) channel-bed morphological units on the background of the environmental parameters (local relief, slope, channel confinement ratio, channel-valley walls connectivity, floodplain continuity and channel abut, channel sinuosity and predominant land cover of riparian zone) of seven valley segments (functional process zones) in two seasons of the year (spring and autumn). The longitudinaldownstream gradient research was conducted on the semi-natural upland headwater brook in the Little Carpathians (9,330 m long, average gradient 2.8%) at 15 morphological sequences (30 sampling points). Each sampling point in spring as well as in autumn was characterised by mean flow velocity, discharge, water depth, channel width, channel bottom particle size, and flow types. Selected physico-chemical variables: pH, dissolved oxygen content (DO), oxygen saturation (DO %), temperature (t) conductivity and total dissolved solids (TDS) were measured directly in the field using the multisonde measuring device. Organisms were identified into the family level. The results showed that differences in zonation of benthic invertebrates between seasons are more apparent than seasonal variability between pools and riffles. Spring samples followed the increasing gradient of total dissolved solids downstream with characteristic families for upper and lower stretch. The disruption of macroinvertebrates zonation was more evident in autumn samples with greatest effects in pools. Based on RDA, the distribution of families was driven by three significant variables in riffles and four in pools. Alike environmental factors of pool sequences in the middle and upper reaches were responsible for similarity in macroinvertebrate structure. In conclusion, the distribution pattern of benthic invertebrates of the natural part of the small headwater stream in terms of abundance of macroinvertebrate families followed the longitudinal zonation in spring, but in autumn were the local habitat conditions more important.

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Benthic assemblage variation among channel units in high-gradient streams on Vancouver Island, British Columbia

Cited by 31 publications

References 37 publications

Comparing fish assemblages and trophic ecology of permanent and intermittent reaches in a Mediterranean stream

Comparing fish assemblages and trophic ecology of permanent and intermittent reaches in a Mediterranean stream

Disturbance, fish, and variation in the predatory insect guild of coastal streams

Testing for longitudinal zonation of macroinvertebrate fauna along a small upland headwater stream in two seasons

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