Persistent border: an analysis of the geographic boundary of an intertidal species

This source preferred by Roger Herbert

Authors: Herbert, R.J.H., Southward, A.J., Clarke, R.T., Sheader, M. and Hawkins, S.J.

http://www.int-res.com/

Journal: Marine Ecology Progress Series

Volume: 379

Pages: 135-150

ISSN: 0171-8630

DOI: 10.3354/meps07899

The biological performance of species close to their biogeographic boundaries is of critical interest in a period of rapid climate change and can inform predictions of future patterns of distribution. The classic view is that performance attributes (reproduction, growth, survival) will gradually decline from the centre towards the edge of a species range. A persistent discontinuity in the distribution of the intertidal barnacle Chthamalus montagui on the central south coast of England has enabled us to test hypotheses about its performance and recruitment as the range edge is approached. Although adult density was reduced by over 5 orders of magnitude along a 200 km distance, there was little evidence of impaired performance at the range edge. There have been fluctuations in abundance over the last 50 yr at shores approaching the border, which are associated with changes in temperature and suggest thermal sensitivities. A study of recruitment in C. montagui and in other intertidal barnacles revealed a region of very low recruitment for all species close to the border of C. montagui. We propose that reductions in larval supply caused by complex regional hydrography and suboptimal habitat quality, not adult performance, is most likely responsible for a steep gradient in recruitment as the border is approached, although possible reductions in larval performance cannot be totally discounted. The location of ‘low recruitment cells’ caused by oceanographic processes that obstruct the dispersal of propagules needs to be identified when modelling the rate of change of biological assemblages and the location and spacing of reserves.

This data was imported from Scopus:

Authors: Herbert, R.J.H., Southward, A.J., Clarke, R.T., Sheader, M. and Hawkins, S.J.

Journal: Marine Ecology Progress Series

Volume: 379

Pages: 135-150

ISSN: 0171-8630

DOI: 10.3354/meps07899

The biological performance of species close to their biogeographic boundaries is of critical interest in a period of rapid climate change and can inform predictions of future patterns of distribution. The classic view is that performance attributes (reproduction, growth, survival) will gradually decline from the centre towards the edge of a species range. A persistent discontinuity in the distribution of the intertidal barnacle Chthamalus montagui on the central south coast of England has enabled us to test hypotheses about its performance and recruitment as the range edge is approached. Although adult density was reduced by over 5 orders of magnitude along a 200 km distance, there was little evidence of impaired performance at the range edge. There have been fluctuations in abundance over the last 50 yr at shores approaching the border, which are associated with changes in temperature and suggest thermal sensitivities. A study of recruitment in C. montagui and in other intertidal barnacles revealed a region of very low recruitment for all species close to the border of C. montagui. We propose that reductions in larval supply caused by complex regional hydrography and suboptimal habitat quality, not adult performance, is most likely responsible for a steep gradient in recruitment as the border is approached, although possible reductions in larval performance cannot be totally discounted. The location of 'low recruitment cells' caused by oceanographic processes that obstruct the dispersal of propagules needs to be identified when modelling the rate of change of biological assemblages and the location and spacing of reserves. © Inter-Research ch 2009.

This data was imported from Web of Science (Lite):

Authors: Herbert, R.J.H., Southward, A.J., Clarke, R.T., Sheader, M. and Hawkins, S.J.

Journal: MARINE ECOLOGY PROGRESS SERIES

Volume: 379

Pages: 135-150

eISSN: 1616-1599

ISSN: 0171-8630

DOI: 10.3354/meps07899

The data on this page was last updated at 04:46 on November 24, 2017.