scholarly journals Heavy Metals in the Burrowing Bivalve Scrobicularia Plana from the Tamar Estuary in Relation to Environmental Levels

1978 ◽  
Vol 58 (1) ◽  
pp. 89-108 ◽  
Author(s):  
G. W. Bryan ◽  
H. Uysal
Keyword(s):  
Macoma Balthica ◽  
Bivalve Mollusc ◽  
Indicator Organism ◽  
Intertidal Sediments ◽  
Overlying Water ◽  
Tamar Estuary ◽  
Widespread Distribution ◽  
South West ◽  
Scrobicularia Plana ◽  
South West England

The bivalve mollusc Scrobicularia plana (da Costa) is very common in the estuaries of South-West England and lives in permanent burrows in intertidal sediments ranging from soft mud to fairly hard sand and sometimes gravel. Although it obtains some of its food by filtering the overlying water, Scrobicularia is mainly a deposit feeder (Hughes, 1969). In addition to its widespread distribution, Scrobicularia has several features which make it attractive as a possible indicator organism for metallic contamination. It is more tolerant of low salinities than most common estuarine bivalves, usually penetrating farther upstream than Macoma balthica, Mytilus edulis and Cerastoderma edule (Percival, 1929; Spooner & Moore, 1940; Bryan & Hummerstone, 1977). Also, it lives for over ten years, usually attaining a length of 4–5 cm, and its rate of growth can be estimated from rings on the shell (Green, 1957; Hughes, 1970).

The Turbellarian Paravortex Parasitic in Scrobiculariid Bivalves: New Records from South-West England

1982 ◽  
Vol 62 (3) ◽  
pp. 739-740 ◽  
Author(s):  
P. E. Gibbs
Keyword(s):  
New Records ◽  
Sea Water ◽  
First Record ◽  
Recent Survey ◽  
Gut Contents ◽  
South West ◽  
Scrobicularia Plana ◽  
Length Range ◽  
South West England

The rhabdocoele turbellarian Paravortex scrobiculariae (Graff) was first described, but not named, by Villot (1878) who discovered this parasite living in the gut of Abra tennis (Montagu) in Brittany. In naming the species, Graff (1882) did not add to Villot's description. Wahl (1906) erected the genus Paravortex to include this form which he had found in Scrobicularia plana (da Costa) and Venerupis decussata (L.) at Trieste and Naples. The first record of P. scrobiculariae in British waters was supplied by Freeman (1957) who, working at Whitstable, Kent, found 8 specimens in 3 out of a sample of 40 S. plana he examined. No further British record appears to have been made.A recent survey has shown Paravortex to be common and widespread in S. plana inhabiting the estuaries of south-west England. As noted by previous workers, Paravortex can be readily seen through the semi-transparent gut wall of its host on account of its pinkish colour; observation is facilitated if the bivalve is maintained in clean sea water for 3–4 days to allow evacuation of some of the gut contents and is most easily performed during the winter months when gametes are not present in quantity. In this study, counts of the Paravortex were made by removing the gut from the surrounding foot tissues and releasing the Paravortex by cutting the gut longitudinally. From each locality, 20–30 S. plana, all within the length range of 30–50 mm, were examined. Paravortex is viviparous, the newly-hatched young being 120–150 μm long; at this stage they are transparent and are easily overlooked amongst the gut contents; thus counts relate chiefly to adults 0·5–1·5 mm in length.

New species of Terschellingia (Nematoda: Linhomoeidae) from the Tamar estuary, England and the Maldive Islands

1989 ◽  
Vol 69 (1) ◽  
pp. 93-99 ◽  
Author(s):  
M. C. Austen
Keyword(s):  
New Species ◽  
Marine Nematode ◽  
Free Living ◽  
Tamar Estuary ◽  
South West ◽  
Oesophageal Bulb ◽  
A New Species ◽  
South West England

A new species of free-living marine nematode, Terschellingia gourbaultae sp. nov., from the Tamar estuary, south-west England, is described and illustrated. This species has also been recorded from Brittany, France. T. daviger, sensu Gerlach (1963) nec Wieser (1956) is a junior homonym and is re-named T. maldivensis sp. nov. Five Terschellingia species including the new species are distinguished by their lack of a distinctly offset, rounded oesophageal bulb; a table and figures are given to aid identification of these species.

Fractionation of thallium in the Tamar estuary, south west England

2013 ◽  
Vol 125 ◽  
pp. 1-7 ◽  
Author(s):  
Marykate U. Anagboso ◽  
Andrew Turner ◽  
Charlotte Braungardt
Keyword(s):  
Tamar Estuary ◽  
South West ◽  
South West England

Chemical variability in the Tamar Estuary, south-west England

1982 ◽  
Vol 14 (6) ◽  
pp. 649-661 ◽  
Author(s):  
A.W. Morris ◽  
A.J. Bale ◽  
R.J.M. Howland
Keyword(s):  
Tamar Estuary ◽  
South West ◽  
Chemical Variability ◽  
South West England

TBE in United Kingdom

2020 ◽  
Keyword(s):  
United Kingdom ◽  
Clinical Disease ◽  
England And Wales ◽  
Probable Case ◽  
The United Kingdom ◽  
South West ◽  
Louping Ill ◽  
The Uk ◽  
North And South ◽  
South West England

Until 2019, TBE was considered only to be an imported disease to the United Kingdom. In that year, evidence became available that the TBEV is likely circulating in the country1,2 and a first “probable case” of TBE originating in the UK was reported.3 In addition to TBEV, louping ill virus (LIV), a member of the TBEV-serocomplex, is also endemic in parts of the UK. Reports of clinical disease caused by LIV in livestock are mainly from Scotland, parts of North and South West England and Wales.4

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