Condition assessment of lamprey populations in the Yorkshire Ouse catchment, north‐east England, and the potential influence of physical migration barriers

Nunn, A. D.; Harvey, Jonathan; Noble, Richard; Cowx, I. G.

doi:10.1002/aqc.863

Cited by 43 publications

(53 citation statements)

References 21 publications

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“…These declines parallel those of Pacific salmonids (Oncorhynchus spp. ), perhaps because the two groups share widely sympatric distributions (Scott and Crossman 1973;Simpson and Wallace 1978;Moyle 2002) and similar anadromous life histories (McDowall 2001;Quinn and Myers 2004). Pacific lamprey adults feed and mature in the ocean, generally enter freshwater and migrate towards spawning areas during summer, and then overwinter and spawn the following spring.…”

Section: Introductionmentioning

confidence: 97%

Variability in migration timing of adult Pacific lamprey (Lampetra tridentata) in the Columbia River, U.S.A.

et al. 2009

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We examined the effects of river environment on the timing of spawning migrations by anadromous Pacific lamprey, Lampetra tridentata, in the Columbia River (U.S.A.). In a 41-year time series of adult lamprey counts, migration timing was earliest in warm, low-discharge years and latest in cold, highflow years. Threshold temperatures associated with run timing were similar throughout the dataset despite significant impoundment-related warming, suggesting that temperature-dependent migration cues have been temporally stable. Within each year, migration rates of PIT-tagged lampreys were positively correlated with temperature and negatively correlated with discharge through multiple river reaches, offering additional evidence for environmental control of upstream movement. Both visual count and PIT-tag data indicated that there may be population-based differences in migration timing within the aggregate Columbia River lamprey run. These life history and behavioral results have potentially farreaching implications for management of lamprey species.

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Section: Introductionmentioning

confidence: 97%

Variability in migration timing of adult Pacific lamprey (Lampetra tridentata) in the Columbia River, U.S.A.

et al. 2009

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“…Impacts are invariably observed most rapidly and dramatically when watercourses are dammed, but the cumulative effects of large numbers of smaller obstructions can also be significant (Lucas et al 2009;Nunn et al 2008). Tools are available to mitigate the impacts of barriers, thereby facilitating the migration of fishes up-and downstream or into adjacent watercourses (Cowx 1998;FAO 2002;Larinier 1998Larinier , 2008.…”

Section: Discussionmentioning

confidence: 99%

“…Increasing awareness of the prevalence and magnitude of fish migrations, including by species previously considered sedentary, has led to concerns over the possible impacts of barriers on population demographics (Baras and Lucas 2001;Nunn et al 2008Nunn et al , 2010. Manmade structures such as weirs, sluices and barrages may impede or prevent access of individuals to essential habitats, potentially affecting the distribution, population structures, spawning success and recruitment of many species.…”

Section: Introductionmentioning

confidence: 99%

Restoring River Connectivity: Prioritizing Passage Improvements for Diadromous Fishes and Lampreys

Nunn

Cowx

2012

AMBIO

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Physical obstructions are becoming increasingly recognized as major factors influencing the migrations, population structures, spawning success and recruitment of freshwater organisms. This paper presents a simple but effective method, intended for use by environmental managers, government agencies and conservation bodies, of rapidly assessing and prioritizing barriers to the migrations of diadromous fishes and lampreys for passage improvements. A prioritization matrix was developed using information on fish stock status, the passage efficiency of fishes at individual structures, the distance from the tidal limit and the passability of downstream barriers, and the quantity and quality of habitat upstream of each structure. Importantly, the 'Likelihood of access' was incorporated into the matrix to account for passage efficiency at downstream barriers. Barriers ranked as the highest priority for passage improvements were those characterized by poor fish stocks upstream, low passage efficiency, easy passage from downstream, and a large quantity and high quality of habitat upstream. Prioritization of migration barriers should ensure that access improvements are targeted to achieve optimum benefits.

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“…As more data become available, the threshold criteria for favourable conservation status for each species can be improved, and uncertainty in the assessment procedures reduced (Nunn et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Establishing survey and monitoring protocols for the assessment of conservation status of fish populations in river Special Areas of Conservation in the UK

Cowx

Harvey

Noble

et al. 2008

Aquatic Conservation

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ABSTRACT1. Under the EC Habitats Directive (92/43/EEC), several rivers in the UK have been designated Special Areas of Conservation (SACs) because they support important populations of fish species. Several factors need to be considered when establishing survey protocols to assess the conservation status of fish species in these rivers.2. It is important to understand the biology and habitat requirements of fish species and to design appropriate monitoring surveys that adequately assess the status of the fish populations. This information can, in turn, provide the basis for establishing sustainable conservation targets for specific stocks, a process known as condition assessment.3. Favourable condition of fish species in SAC rivers is assessed using three criteria. The first relates to density of fish in various life stages against pre-set targets, assuming that an appropriate number of sites is surveyed to account for natural spatial and temporal variations in fish populations. The second is evaluation of the demographic structure to demonstrate continued recruitment success. Third, by mapping the distribution of the target species in individual rivers and where favourable condition is only achieved where there has been no reduction in the distribution range river between surveys. 4. The framework described was developed from limited survey data. As more monitoring and assessment data become available, the threshold criteria for favourable condition for each species should be improved, and uncertainty in the procedures reduced.

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Condition assessment of lamprey populations in the Yorkshire Ouse catchment, north‐east England, and the potential influence of physical migration barriers

Cited by 43 publications

References 21 publications

Variability in migration timing of adult Pacific lamprey (Lampetra tridentata) in the Columbia River, U.S.A.

Variability in migration timing of adult Pacific lamprey (Lampetra tridentata) in the Columbia River, U.S.A.

Restoring River Connectivity: Prioritizing Passage Improvements for Diadromous Fishes and Lampreys

Establishing survey and monitoring protocols for the assessment of conservation status of fish populations in river Special Areas of Conservation in the UK

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