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|Title: ||A continental scale evaluation of the role of limpet grazing on rocky shores|
|Authors: ||Coleman, R. A.|
Underwood, A. J.
Castro, J. J.
Hartnoll, R. G.
Jenkins, S. R.
Santina, P. D.
Hawkins, S. J.
|Issue Date: ||2006|
|Abstract: ||It is critical for our knowledge of biodiversity
and ecosystem processes to understand how individual
species contribute to ecosystem processes and how these
contributions vary in space and time. We used a
manipulative field experiment in five locations over 17 º
of latitude [from southern Portugal to the Isle of Man
(British Isles)] to determine the relative response of
rocky intertidal algal assemblages released from control
by the grazing of limpets. Response ratios showed that
when limpets were removed there was a trend of effects
from north to south. In the north, grazing had a strong
effect on algal assemblages, but removing grazers
reduced spatial variability in assemblages. In the south,
the effect of limpet grazing was far weaker and removal
of grazers had a much reduced impact on spatial variability.
Here we show a clear trophic control of an
ecosystem in that grazing by limpets not only determines
macroalgal abundance overall but also modifies
ecosystem stability via variability in cover of algae.|
|Appears in Collections:||BIO - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica|
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