Changing Habitats

Current Activity

Habitat presence and quality is a controlling factor in the distribution and abundance of species. Widespread post-war habitat destruction led to a decline in many species and was a driver for the BRC’s establishment. Now, changes to habitats are often more subtle, brought about by factors such as fluctuating grazing pressure, eutrophication or changing climate. The recording schemes are essential in documenting the effect of these changes and in understanding the habitat requirements of species.

 

 

Key Outputs

The publication of atlases provides the opportunity to analyse long-term changes in range in response to habitat changes and other variables. Codification of attributes, as in PLANTATT147 and BRYOATT148, allows species to be linked to their habitats, an important approach being extended to other species groups. Changes in popular groups with rapidly changing ranges, such as butterflies, are summarised every five years. Records in the BRC database are available for analysis in between major, ‘state of the nation’ reports.

Catastrophic decline of a habitat specialist: Argynnis adippe, the High Brown Fritillary

Map showing declining distribution of high brown fritillary

Figure: Jim Asher, Butterfly Conservation

The High Brown Fritillary (Argynnis adippe) requires warm microhabitats where the larval foodplants, various species of violet, occur with bracken; they include south-facing rocky slopes, coppice woodlands or woodland clearings. Its decline mirrors the loss of coppiced woodland and bracken/grassland mosaics with low intensity grazing by cattle or ponies.

Expansion of a species able to colonise newly available habitats: Hairy Dragonfly

Map showing expansion of hairy dragonfly distribution

Figure: Steve Cham, British Dragonfly Society

As shown by the atlas published in 2014, the distribution of the Hairy Dragonfly (Brachytron pratense) was mainly coastal in Britain until recent years when it has colonised a number of inland gravel pits that were excavated in the 1960s and have acquired a mature vegetation cover. It may also have benefited from the more favourable climate in recent decades.

National Plant Monitoring Scheme

Photo of surveying for the natinoal plant monitoring scheme

Photo: Lucy Hulmes, CEH.

The National Plant Monitoring Scheme was designed and developed my UKCEH, BSBI, Plantlife and JNCC

The Scheme aims to fill a gap in terrestrial habitat monitoring by focusing on the abundance of plant species within plots for a range of vegetation types. This should enable changes in plant diversity to be detected earlier than is possible with traditional biological recording conducted at broader scales.

General recording has demonstrated habitat change effects on species with a very narrow habitat requirement, such as arable weeds or chalk grassland butterflies. Effects on species with a broader habitat range are harder to measure. Allocating records more precisely to habitats make it possible to investigate the effects of habitat modification on species with broader requirements, and identify changes in their habitat requirements in response to changing climate. This is a rationale of the National Plant Monitoring Scheme.

References

733 Sutton Peter G., Beckmann B, Nelson Brian (2017) The current status of Orthopteroid insects in Britain and Ireland. ,
RN317 Viglášová Sandra, Nedved Oldřich, Zach Peter, Kulfan Jan, Parák Michal, Honek Alois, Martinkova Zdenka, Roy Helen E. (2017) Species assemblages of ladybirds including the harlequin ladybird Harmonia axyridis: a comparison at large spatial scale in urban habitats. ,
622 Burns F., Eaton Mark A, Barlow K.E., Beckmann B, Brereton Tom M., Brooks D.R., Brown Peter M. J., Fulaij Al, Gent T., Henderson Ian G, Noble David G., Parsons M.S., Powney Gary D., Roy Helen E., Stroh P., Walker Kevin J., Wilkinson J.W., Wotton S.R., Gregory R.D. (2016) Agricultural management and climatic change are the major drivers of biodiversity change in the UK. ,
629 Bantock T. (2016) A review of the Hemiptera of Great Britain: The shieldbugs and allied families (Coreoidea, Pentatomoidea & Pyrrhocoroidea). Natural England Commissioned Report NECR190.. Natural England,
719 Viana D. S., Figuerola J., Schwenk K., Manca M., Hobaek A., Mjelde M., Preston Christopher D., Gornall R. J., Croft J. M., King R. A., Green A. J., Santamaria L. (2016) Assembly mechanisms determining high species turnover in aquatic communities over regional and continental scales. ,
RN296 Viana D. S., Figuerola J., Schwenk K., Manca M., Hobaek A., Mjelde M., Preston Christopher D., Gornall R. J., Croft J. M., King R. A., Green A. J., Santamaria L. (2016) Assembly mechanisms determining high species turnover in aquatic communities over regional and continental scales. ,
RN377 Staley Joanna T., Botham M. S., Chapman Roselle E., Amy Sam R., Heard Matthew S., Hulmes Lucy, Savage Joanna, Pywell Richard F. (2016) Little and late: How reduced hedgerow cutting can benefit Lepidoptera. ,
599 Beckmann B, Purse Bethan V., Roy D. B., Roy Helen E., Sutton Peter G., Thomas Chris D. (2015) Two species with an unusual combination of traits dominate responses of British grasshoppers and crickets to environmental change. ,
601 Stewart Alan JA, Bantock T., Beckmann B, Botham M. S., Hubble David S, Roy D. B. (2015) The role of ecological interactions in determining species ranges and range changes. ,
628 Cook A. A. (2015) A review of the Hemiptera of Great Britain: The Aquatic and Semi-aquatic Bugs (Dipsocoromorpha, Gerromorpha, Leptopodomorpha & Nepomorpha). Natural England Commissioned Report NECR188.. Natural England,