Limits...
Imposex in the dogwhelk (Nucella lapillus): 22-year monitoring around England and Wales.

Nicolaus EE, Barry J - Environ Monit Assess (2015)

Bottom Line: This study firstly analysed the results of the 2014 survey and secondly carried out a trend assessment of the same 88 sampled sites between 1997 and 2014 of which 65 showed statistically significant reductions.To highlight the magnitude of change, the Vas Deferens Sequence stages (VDS) of the same 56 sites sampled in 1997 and 2010 showed that the Vas Deferens Sequence Index (VDSI) reduced statistically significantly from 2.89 and 0.42, respectively.These data confirm that the legislation enacted, latterly through the International Maritime Organization (IMO) during 2003 to 2008, has been effective in progressively reducing the impact of TBT in the marine environment.

View Article: PubMed Central - PubMed

Affiliation: Centre for Environment, Fisheries and Aquaculture Science, Lowestoft, Suffolk, NR33 0LB, UK. manuel.nicolaus@cefas.co.uk.

ABSTRACT
Six imposex surveys in the dogwhelk (Nucella lapillus) have been conducted over the past two decades to assess legislation effectiveness controlling the use of tri-butyl tin (TBT) by the maritime shipping industry. This study firstly analysed the results of the 2014 survey and secondly carried out a trend assessment of the same 88 sampled sites between 1997 and 2014 of which 65 showed statistically significant reductions. To highlight the magnitude of change, the Vas Deferens Sequence stages (VDS) of the same 56 sites sampled in 1997 and 2010 showed that the Vas Deferens Sequence Index (VDSI) reduced statistically significantly from 2.89 and 0.42, respectively. These data confirm that the legislation enacted, latterly through the International Maritime Organization (IMO) during 2003 to 2008, has been effective in progressively reducing the impact of TBT in the marine environment. Nevertheless, the 2014 results show that two of 18 sampled sites (Gurnard Bay and St. Mawes) are still above the Ecotoxicological Assessment Criteria (EAC) derived for TBT (VDSI ≤ 2).

No MeSH data available.


All 102 imposex sampling sites in England and Wales
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Related In: Results  -  Collection


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Fig1: All 102 imposex sampling sites in England and Wales

Mentions: The aim of the limited 1992 survey (14 stations) was to measure the effects TBT had on dogwhelks, to establish the geographic spread of it around England and Wales and to assess the need for a wider study. Due to the high level of TBT exposure around these coastlines, the network of sites increased from 14 sites in 1992 to 102 in 2007 (Fig. 1, Table 1). These sites include areas close to ports, e.g. Dover, Southampton Water and Milford Haven; areas close to shipping lanes (traffic separation zones), e.g. Dover Straits, Isle of Wight and Holyhead; and areas away from the influence of shipping, including “background reference” sites.Fig. 1


Imposex in the dogwhelk (Nucella lapillus): 22-year monitoring around England and Wales.

Nicolaus EE, Barry J - Environ Monit Assess (2015)

All 102 imposex sampling sites in England and Wales
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4641150&req=5

Fig1: All 102 imposex sampling sites in England and Wales
Mentions: The aim of the limited 1992 survey (14 stations) was to measure the effects TBT had on dogwhelks, to establish the geographic spread of it around England and Wales and to assess the need for a wider study. Due to the high level of TBT exposure around these coastlines, the network of sites increased from 14 sites in 1992 to 102 in 2007 (Fig. 1, Table 1). These sites include areas close to ports, e.g. Dover, Southampton Water and Milford Haven; areas close to shipping lanes (traffic separation zones), e.g. Dover Straits, Isle of Wight and Holyhead; and areas away from the influence of shipping, including “background reference” sites.Fig. 1

Bottom Line: This study firstly analysed the results of the 2014 survey and secondly carried out a trend assessment of the same 88 sampled sites between 1997 and 2014 of which 65 showed statistically significant reductions.To highlight the magnitude of change, the Vas Deferens Sequence stages (VDS) of the same 56 sites sampled in 1997 and 2010 showed that the Vas Deferens Sequence Index (VDSI) reduced statistically significantly from 2.89 and 0.42, respectively.These data confirm that the legislation enacted, latterly through the International Maritime Organization (IMO) during 2003 to 2008, has been effective in progressively reducing the impact of TBT in the marine environment.

View Article: PubMed Central - PubMed

Affiliation: Centre for Environment, Fisheries and Aquaculture Science, Lowestoft, Suffolk, NR33 0LB, UK. manuel.nicolaus@cefas.co.uk.

ABSTRACT
Six imposex surveys in the dogwhelk (Nucella lapillus) have been conducted over the past two decades to assess legislation effectiveness controlling the use of tri-butyl tin (TBT) by the maritime shipping industry. This study firstly analysed the results of the 2014 survey and secondly carried out a trend assessment of the same 88 sampled sites between 1997 and 2014 of which 65 showed statistically significant reductions. To highlight the magnitude of change, the Vas Deferens Sequence stages (VDS) of the same 56 sites sampled in 1997 and 2010 showed that the Vas Deferens Sequence Index (VDSI) reduced statistically significantly from 2.89 and 0.42, respectively. These data confirm that the legislation enacted, latterly through the International Maritime Organization (IMO) during 2003 to 2008, has been effective in progressively reducing the impact of TBT in the marine environment. Nevertheless, the 2014 results show that two of 18 sampled sites (Gurnard Bay and St. Mawes) are still above the Ecotoxicological Assessment Criteria (EAC) derived for TBT (VDSI ≤ 2).

No MeSH data available.