Spatial and temporal distribution of fish in a small lowland stream

Ibbotson, A.T.; Armitage, Patrick D.; Beaumont, W. R. C.; Ladle, M.; Welton, S.

doi:10.1111/j.1365-2400.1994.tb00157.x

Cited by 13 publications

(5 citation statements)

References 14 publications

(6 reference statements)

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“…of carp (Cyprinus carpio) spawning in the impounded section above the sluice gates. In addition, the abundance of fish species differs between the impounded and downstream reaches and only one species, the eel (Anguilla anguilla), was more common in the upstream regulated section, (Ibbotson et al, 1994).…”

Section: Discussionmentioning

confidence: 99%

Impact assessment of regulation at the reach level using macroinvertebrate information from mesohabitats

Armitage

Pardo

1995

Regul. Rivers: Res. Mgmt.

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The environmental effects of stream regulation are often assessed with reference to changes in river benthos, and biotic scores and indices have been used to summarize data on faunal community structure and richness. Although they have their use in presenting complicated data in a simplified form, they often do not detect the more subtle effects of regulation. In lowland regions the regulation of rivers is most often due to water abstraction, channelization and the construction of weirs or sluices. The effects of this form of stream regulation may sometimes be particularly difficult to demonstrate with conventional biological assessment techniques. In this study we examine a length of stream regulated with sluice gates using conventional techniques and test the applicability of the mesohabitat method (categorization of reaches on the basis of their substratum types) in describing changes brought about by regulation. Conventional biological assessment techniques were unable to demonstrate the regulation effects. This was because, although changes had occurred along the reach, these were not associated with a significant change in scores and indices based on family richness. The changes were subtle and were most clearly revealed by clustering techniques and analysis of variance. Most of the change was due to altered physical habitat and this was reflected in the proportions of mesohabitats above and below the sluice gates. The association of mesohabitats with particular faunal assemblages allows an assessment of the overall effects of habitat change on the composition of the faunal community.

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Section: Discussionmentioning

confidence: 99%

Impact assessment of regulation at the reach level using macroinvertebrate information from mesohabitats

Armitage

Pardo

1995

Regul. Rivers: Res. Mgmt.

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“…Detailed descriptions of the River Frome and the East Stoke site are given in Westlake et al (1972), Ibbotson et al (1994), Welton et al (2002). In summary, it is a small chalk river system with a long-term historical adult Atlantic salmon run of approximately 1500 fish per year as measured at the East Stoke adult salmon counter that is situated 4 km above the tidal limit.…”

Section: Site Description and Methodsmentioning

confidence: 99%

Diel migration patterns of Atlantic salmon smolts with particular reference to the absence of crepuscular migration

Ibbotson

Beaumont

Pinder

et al. 2006

Ecology of Freshwater Fish

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Ibbotson AT, Beaumont WRC, Pinder A, Welton S, Ladle M. Diel migration patterns of Atlantic salmon smolts with particular reference to the absence of crepuscular migration.Abstract -The real-time diel pattern of Atlantic salmon smolt migration was observed for 8 years using automatic resistivity counters verified by video surveillance. A clear dominant nocturnal migration was demonstrated early in the migration period, later becoming increasingly diurnal, until rates became approximately equal at day and night. Migration patterns were related to water temperature, such that when mean daily temperatures were below 12°C, hourly rates of migration were significantly lower during the day than at night. When daily mean temperatures exceeded 12°C, there was no significant difference between diurnal and nocturnal migration rates. Migration patterns showed a distinct suppression of migration at dawn and dusk throughout the migration period. It is hypothesised that this behaviour is an active decision and/or an adaptive strategy either to take advantage of increased food in the form of invertebrate drift or to reduce predation risk from actively feeding piscivores or both.

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“…Turnpenny (1989) surveyed 181 UK streams and estimated densities of 3-10 eels 100 m 2 , while Naismith & Knights (1993) estimated maximum eel density on the River Thames at 6 eels 100 m 2 . Ibbotson et al (1994) calculated densities on the River Frome at 5-20 eels 100 m 2 but, as they excluded fish <20 cm long from their calculations, total densities would have been higher. In Scandinavia, Vøllestad & Jonsson (1988) calculated eel density to be 1·16 eels 100 m 2 in the River Imsa, Norway, based on the total estimated population size in the catchment divided by the total area of water (including the deeper parts of lakes), while Degerman et al (1986) calculated values from 1·27-5·27 eels 100 m 2 for 12 Swedish streams.…”

Section: Density and Biomassmentioning

confidence: 99%

Spatial and temporal trends in unexploited yellow eel stocks in two shallow lakes and associated streams

Carss¹,

Elston

Nelson³

et al. 1999

Journal of Fish Biology

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Mean yellow eel density and biomass in two adjacent shallow (mean depth c 1·5 m) lochs varied significantly between years. Temporal patterns of density, biomass and size were similar in both soft and rocky substrata in the lochs, although eels were consistently smaller in the latter habitat. In both substrata, average length and weight showed a non-significant inverse relationship with density, supporting the hypothesis of density-dependent regulation of the yellow eel population. Fyke net catches were size selective, catching no eels <30 cm long, and providing length-frequency information for silver eels. Fyke net catch per unit effort (CPUE) declined consistently each autumn but specific annual trends were different. When eel density increased, fyke net CPUE declined substantially. 1999 The Fisheries Society of the British Isles

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Spatial and temporal distribution of fish in a small lowland stream

Cited by 13 publications

References 14 publications

Impact assessment of regulation at the reach level using macroinvertebrate information from mesohabitats

Impact assessment of regulation at the reach level using macroinvertebrate information from mesohabitats

Diel migration patterns of Atlantic salmon smolts with particular reference to the absence of crepuscular migration

Spatial and temporal trends in unexploited yellow eel stocks in two shallow lakes and associated streams

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