Hampshire bryophytes

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Hampshire 10km distribution maps

These maps show the distribution of the main recognised taxa that have been recorded in Hampshire, plotted at 10km square (hectad) resolution. The maps were updated in July 2018 from those previously shown and are now based on all records up to March 2016 and on some of those added more recently. They also reflect recent confirmed additions to the VC11 and VC12 lists, including Dialytrichia saxicola, Hennediella macrophylla, Riccia crystallina and Sematophyllum substrumulosum.

Where possible, sensu lato and sensu stricto entries for the same species have been amalgamated into one or other entity and some taxa that have been recorded to subspecies level have been combined with the sensu lato species where no other subspecies exists in the county. The only taxon of the 493 recorded taxa not mapped here is Ulota crispa 'sensu strictissimo' (in the very strict sense), which has recently been split from Ulota crispula (which appears to be at least occasional in Hampshire) and Ulota intermedia (not yet recorded).

Date classes have been added to distinguish between those taxa last recorded in each hectad before 1960, between 1960 and 1989, and from 1990 onwards. The maps appear to indicate that many species have declined since 1960, but this is also due to under-recording in many cases (despite having well known internationally important sites and habitats, Hampshire has been relatively poorly studied by bryologists). Formely widespread species which have certainly declined include Campylopus fragilis, Leucodon sciuroides and Tortula lanceola. The maps show that recently spreading species, such as Didymodon nicholsonii and Cololejeunea minutissima are much better recorded in VC11 than in VC12. This is mainly due to more recent coverage of VC11 by Rod Stern (who produced the VC atlas in 2010) and myself.

Part of the reason for setting up this web site is to encourage more botanists in the county to take up recording bryophytes. The gaps in the data are not too obvious when the records are viewed at 10km resolution, but become apparent at the 5km resolution and smaller scales. The map below (not yet updated) shows that perhaps more work could be done across north Hampshire generally. Some of the corners and coastal areas are also probably under-recorded, even if some of them only contain small portions of land actually within one of the two vice-counties.

I would like to thank the British Bryological Society and to Oli Pescott at the Biological Records Centre for his assistance in supplying and managing the datasets. The BBS Atlas dataset is now on the NBN Gateway (but Hamsphire records are currently only included up to about March 2014). The maps were generated from QGIS using the Tom.bio Biological Recording plugin developed for the Field Studies Council.

Last updated by John Norton, July 2018

Species richness

The map opposite shows the total number of taxa recorded per 10km square for the two Hampshire vice-counties:

Contains Ordnance Survey data © Crown copyright and database right (2018).

number of taxa per 10km square