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25 May 2013  
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Trends - Dolomedes plantarius (Fen Raft Spider)

 
Latest estimate post 2008 reporting round

No trend latest estimate data have been recorded for this national plan.


2008 reporting

 

Date assessed

Trend

Accuracy

Adequate baseline data?

Data available via NBN?

UK

2008 Fluctuating - probably stable Partial survey No but likely by 2011 No
  Did you refer to the LBAP data (e.g. obtained from the links provided) when compiling this assessment?   No

E

2008 Fluctuating - probably stable Partial survey No but likely by 2011 No
  Did you refer to the LBAP data (e.g. obtained from the links provided) when compiling this assessment?   No
  The Lopham Population has suggested a range extension in the face of better grazing of the fen vegetation, whilst the Pevensey population was quite large in the last survey. It is considered, in combination, that this is probably a stable English population, in the light of the number of agi-environment agreements on the Pevensey levels, though these are not specifically ditch-focused. An analysis of a smaple of nursery webs between 1990 and 1991 should not statisticaly significant differences,

NI

Not relevant for this country

S

Not relevant for this country

W

2008 Fluctuating - probably stable Best guess No but likely by 2011 No
  Did you refer to the LBAP data (e.g. obtained from the links provided) when compiling this assessment?   No
  Asides from establishng its presence it is not considered that the full extent of Dolomedes occupation across Crymlyn Bog and asspciated and connected wetlands is fully known. This is, in part, becuase of the extreme difficulty of surveying in this terrain, and the difficuty, (despite its size) of seeing Dolomedes in situ. It is considered that the habitat is probably good enough at present for the spider not to be declining.


2005 reporting

 

Date assessed

Trend

Accuracy

Adequate baseline data?

Data available via NBN?

UK

2005 No clear trend Partial survey No but likely by 2008 Some

E

2005 Fluctuating - probably declining Sample or full survey No but likely by 2008  

NI

Not relevant for this country

S

Not relevant for this country

W

2005 Stable Partial survey Yes Yes


2002 reporting

 

Trend

Accuracy

Reference for data

UK

Fluctuating / No clear trend Full survey  

E

Fluctuating / No clear trend Full survey  

NI

     

S

     

W

     


1999 reporting

 

Status

UK

No change

E

No change

NI

Not appropriate

S

Not appropriate

W

Not appropriate