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Plant response to disturbance in a Mediterranean grassland: How many functional groups?

Identifieur interne : 00C493 ( Main/Exploration ); précédent : 00C492; suivant : 00C494

Plant response to disturbance in a Mediterranean grassland: How many functional groups?

Auteurs : Sandra Lavorel [France] ; S. Mcintyre [Australie] ; Karl Grigulis [France, Australie]

Source :

RBID : ISTEX:E4AE9FDF59272CDC0B4D58A8AC8FD269C3F86C52

Descripteurs français

English descriptors

Abstract

Abstract. Data referring to changes in vegetation composition resulting from cattle exclosure and ploughing in a Portuguese pasture dominated by annuals were used to test hypotheses regarding the biology of species favoured or eliminated by disturbance in semi‐natural herbaceous communities. These hypotheses were tested in two ways. First we compared the distribution of six a priori groups – grasses, small rosettes, large rosettes, small species with leafy stems, large species with leafy stems, legumes – across grazed, ploughed and undisturbed plots. In a second set of analyses we examined changes in the frequencies of individual biological attributes in response to grazing and ploughing. These analyses were carried out separately for grasses and dicot forbs. Overall, the species composition showed little response to either grazing or ploughing, though species dominance changed. This lack of responsiveness of species composition was attributed to the long history of intensive land use which has resulted in the loss of disturbance‐intolerant species over entire landscapes.

Url:
DOI: 10.2307/3237081


Affiliations:


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Le document en format XML

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<term>Actual combinations</term>
<term>Annual grassland</term>
<term>Annual pastures</term>
<term>Attribute</term>
<term>Autumn germination</term>
<term>Biological attributes</term>
<term>Biological diversity</term>
<term>Biomass</term>
<term>Block structure</term>
<term>Cambridge university press</term>
<term>Canopy</term>
<term>Canopy structure</term>
<term>Cattle exclosure</term>
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<term>Different sites</term>
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<term>Disturbance treatments</term>
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<term>Ecosystem</term>
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<term>Global change</term>
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<term>Lateral spread</term>
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<term>Leafy</term>
<term>Legume</term>
<term>Life forms</term>
<term>Light seeds</term>
<term>Logarithmic transformation</term>
<term>Mcintyre</term>
<term>Mediterranean</term>
<term>Mediterranean grassland</term>
<term>Medium height</term>
<term>Moderate dormancy</term>
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<term>Partial species density</term>
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<term>Previous studies</term>
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<term>Regional scale</term>
<term>Relative frequencies</term>
<term>Relative species density</term>
<term>Response group</term>
<term>Response groups</term>
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<term>Rosette canopy</term>
<term>Rosette canopy structure</term>
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<term>Seed dormancy</term>
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<term>Treatment levels</term>
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<term>Ungrazed</term>
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<term>Autumn germination</term>
<term>Biological attributes</term>
<term>Biological diversity</term>
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<term>Herbaceous communities</term>
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<term>Individual traits</term>
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<term>Large rosettes</term>
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<term>Lateral spread</term>
<term>Lavorel</term>
<term>Leafy</term>
<term>Legume</term>
<term>Life forms</term>
<term>Light seeds</term>
<term>Logarithmic transformation</term>
<term>Mcintyre</term>
<term>Mediterranean</term>
<term>Mediterranean grassland</term>
<term>Medium height</term>
<term>Moderate dormancy</term>
<term>Morphology</term>
<term>Other hand</term>
<term>Partial densities</term>
<term>Partial species densities</term>
<term>Partial species density</term>
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<term>Ploughing treatments</term>
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<term>Regeneration attributes</term>
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<term>Relative frequencies</term>
<term>Relative species density</term>
<term>Response group</term>
<term>Response groups</term>
<term>Rosette</term>
<term>Rosette canopy</term>
<term>Rosette canopy structure</term>
<term>Rosette morphology</term>
<term>Rosette species</term>
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<term>Seed dormancy</term>
<term>Seed sources</term>
<term>Seed weight</term>
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<term>Short duration</term>
<term>Significant changes</term>
<term>Significant differences</term>
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<term>Small rosettes</term>
<term>Small seeds</term>
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<term>Small species</term>
<term>Soil disturbance</term>
<term>Species composition</term>
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<term>Species richness</term>
<term>Species traits</term>
<term>Standard deviation values</term>
<term>Summer drought</term>
<term>Syndrome</term>
<term>Tall height</term>
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<term>Total species richness</term>
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<term>Ungrazed</term>
<term>Unploughed</term>
<term>Vegetation</term>
<term>Vegetation composition</term>
<term>Woodward cramer</term>
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<front>
<div type="abstract">Abstract. Data referring to changes in vegetation composition resulting from cattle exclosure and ploughing in a Portuguese pasture dominated by annuals were used to test hypotheses regarding the biology of species favoured or eliminated by disturbance in semi‐natural herbaceous communities. These hypotheses were tested in two ways. First we compared the distribution of six a priori groups – grasses, small rosettes, large rosettes, small species with leafy stems, large species with leafy stems, legumes – across grazed, ploughed and undisturbed plots. In a second set of analyses we examined changes in the frequencies of individual biological attributes in response to grazing and ploughing. These analyses were carried out separately for grasses and dicot forbs. Overall, the species composition showed little response to either grazing or ploughing, though species dominance changed. This lack of responsiveness of species composition was attributed to the long history of intensive land use which has resulted in the loss of disturbance‐intolerant species over entire landscapes.</div>
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