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Assessment of lamprey abundance and distribution in the River Tweed SAC/SSSI, 2004

Dataset homepage

Citation

NatureScot (2020). Assessment of lamprey abundance and distribution in the River Tweed SAC/SSSI, 2004. Occurrence dataset https://doi.org/10.15468/vv63tu accessed via GBIF.org on 2021-03-09.

Description

Ammocoete larvae of the two Lampetra species (L. fluviatilis and L. planeri) were widespread throughout the survey area, though larvae of the sea lamprey (Petromyzon marinus) were found only in the most downstream section of the main river Tweed. However, several age classes of P. marinus larvae were found, indicating regular breeding in this section of the river in recent years. Variable numbers of age classes of Lampetra larvae were also apparent. Post-larval macropthalmia stages of both Lampetra species were also found. Generally, those of L. fluviatilis were in the larger channels of the main Tweed and major tributaries, while those of L. planeri were in the smaller channels as well. Historic and recent records of adults confirm the wide spread of the Lampetra species, but suggest a more extensive range for P. marinus breeding than shown by this survey. High abundances of Lampetra juveniles were found at relatively few survey locations. This indicates that most bankside habitat in the Tweed catchment is of little importance for lamprey, but that the areas of good habitat where high levels of abundance do occur could be of critical importance for local populations.

Purpose

To assess the distribution and abundance of lamprey. The three lamprey species present in UK (brook lamprey Lampetra planeri, river lamprey L. fluviatilis and sea lamprey Petromyzon marinus) are listed on Annex IIa of the Habitats Directive, reflecting concern over widespread declines across their European range. Five Scottish rivers known to hold good populations of lampreys have been selected as candidate Special Areas of Conservation (cSAC).

Sampling Description

Method steps

  1. Method is described in Harvey J & Cowx I (2003). Monitoring the River, Brook and Sea Lamprey, Lampetra fluviatilis, L. planeri and Petromyzon marinus. Conserving Natura 2000 Rivers Monitoring Series No. 5, English Nature, Peterborough.

Taxonomic Coverages

Geographic Coverages

Bibliographic Citations

Contacts

originator
NatureScot
Great Glen House, Leachkin Road
INVERNESS
IV3 8NW
Telephone: 01463 725000
homepage: https://www.nature.scot/
metadata author
NatureScot
Great Glen House, Leachkin Road
INVERNESS
IV3 8NW
Telephone: 01463 725000
homepage: https://www.nature.scot/
distributor
NBN Atlas
Unit F, 14 - 18 St Mary's Gate, Lace Market
Nottingham
NG1 1PF
Nottinghamshire
GB
email: admin@nbnatlas.org
Colin McLeod
administrative point of contact
position: editor
email: Colin.McLeod@nature.scot
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