Description of Brown Trout Redds in a Mountain Stream

Grost, Richard T.; Hubert, Wayne A.; Wesche, Thomas A.

doi:10.1577/1548-8659(1991)120<0582:dobtri>2.3.co;2

Cited by 51 publications

(71 citation statements)

References 11 publications

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“…Other studies have shown similar effects by spawning salmonids, although none have used cryogenic sampling in the same manner to document these changes (Everest et al 1987, Young et al 1989, Young et al 1990, Grost et al 1991b. Removal of some of the matrix material from the stream bed makes space for the eggs and increases the porosity of the gravel.…”

Section: Discussionmentioning

confidence: 96%

Persistence of egg pocket architecture in redds of chum salmon, Oncorhynchus keta

Peterson

Quinn

1996

Environ Biol Fish

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Analysis of frozen cores of gravel surrounding the egg pockets of chum salmon, Oncorhynchus keta, collected in the fall revealed that spawning activity by females purged about 75% of the fine sediments from the stream bed. The egg pocket was one of four distinct vertical strata detected in the cores. There was an undisturbed layer below the egg pocket, and separate bridge and cover strata above the egg pocket, all defined by different particle size distributions. However, by spring most of the egg pockets had been infiltrated with fine sediment and the particle size distribution approached background levels. The most likely physical factors responsible for these results were: (1) intrusion of fine sediments through the cleaned surface gravel, (2) lateral subsurface migration of fine sediment into interstitial voids, (3) scour of the surface gravel and subsequent deposition of a sand rich bedload, and (4) superimposed spawning activity of other fish, causing disturbance of the cleaned surface gravel and exposing the egg pocket to intrusion of fine particles. We conclude that, while female salmon substantially affect the physical environment of their embryos, subsequent sediment transport processes and fine bedload flux tend to return this environment to pre-spawning conditions.

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Section: Discussionmentioning

confidence: 96%

Persistence of egg pocket architecture in redds of chum salmon, Oncorhynchus keta

Peterson

Quinn

1996

Environ Biol Fish

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“…Habitat assessment procedures for stream-dwelling brown trout have focused on features important to juvenile and adult fish (Wesche et al, 1987a(Wesche et al, , 1987bKozel et al, 1989aKozel et al, , 1989bKozel et al, , 1990 or spawning fish (MacCrimmon et al, 1990;Grost et al, 1991;Beard & Carline, 1991) with little or no consideration of the habitat needs of age-0 fish. Age-O brown trout occupy unique habitat that could be limiting in some cases, such as downstream from reservoirs where stream channels tend to narrow and deepen and lateral habitat is lost (Gore & Petts, 1989).…”

Section: Discussionmentioning

confidence: 99%

Diurnal shifts in use of summer habitat by age-0 brown trout in a regulated mountain stream

1994

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Diurnal shifts in habitat use by age-0 (< 50 mm total length) brown trout (Salmo trutta) were observed from June to July 1989 and 1990 in low-gradient (< 1% channel slope) reaches of Douglas Creek, Medicine Bow National Forest, Wyoming. Fish were visually located during day and night, and water depth, water velocity, distance from the stream edge, substrate, habitat type, and cover were determined at each location. The fish were found predominantly in locations with slow water velocities in streammargin and backwater-pool habitats. They were observed in slower water, closer to the stream edge at night than during the day.

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“…For example, Adams and Beschta (1980) reported large spatial and temporal variation in the composition of stream substrates, but they did not quantify the proportion of that variation caused by their use of a single-probe freeze-core sampler. Crisp and Carling (1989), also using this device, failed to detect significant differences in substrate composition at sites before and after spawning by brown trout (Salrno trutta), yet such differences have been caused by spawning brook trout ) and brown trout (Grost 1989).…”

Section: Discussionmentioning

confidence: 95%

Biases Associated with Four Stream Substrate Samplers

Young¹,

Hubert²,

Wesche³

1991

Can. J. Fish. Aquat. Sci.

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. Wesche. 1991. Biases associated with four stream substrate samplers.We compared samples collected from 10 substrates of various compositions with a single-probe freeze-core sampler, a triple-probe freeze-core sampler, a McNeil sampler, and a shovel. The accuracy with which these devices sampled particles larger than 50 mm in diameter varied; they were oversampled by the freeze-core devices, sampled in proportion to their availability by a shovel, and sampled inconsistently by the McNeil Sam-' pler. The geometric mean particle size and variance of single-probe freeze-core samples consistently exceeded those of samples collected with the other devices. Most sample means also exceeded the test substrate means. By excluding the proportions of particles larger than 50 mm in diameter in our analyses, we found that proportions of several particles sizes in samples collected by different methods differed significantly from the actual proportions in test substrates. There were few differences between the single-and triple-probe freeze-core samples or between McNeil and shovel samples. All four samplers were biased, but the McNeil sampler most frequently produced samples that approximated the true substrate composition.

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Description of Brown Trout Redds in a Mountain Stream

Cited by 51 publications

References 11 publications

Persistence of egg pocket architecture in redds of chum salmon, Oncorhynchus keta

Persistence of egg pocket architecture in redds of chum salmon, Oncorhynchus keta

Diurnal shifts in use of summer habitat by age-0 brown trout in a regulated mountain stream

Biases Associated with Four Stream Substrate Samplers

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