Are grazing increaser species better tolerators than decreasers? An experimental assessment of defoliation tolerance in eight British grassland species

del‐Val, Ek; Crawley, Michael J.

doi:10.1111/j.1365-2745.2005.01011.x

Cited by 124 publications

(115 citation statements)

References 66 publications

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“…Tolerance to grazing, i.e., the ability to regrow and/or reproduce after a grazing event (Strauss and Agrawal 1999), is dependent on both frequency and intensity of grazing (del-Val and Crawley 2005). Grazing intensity on Geranium sylvaticum, expressed in terms of proportion of biomass removed, is low in this study; normally only 1-2 leaves are removed (M. Evju, unpublished data).…”

Section: Discussionmentioning

confidence: 99%

“…Repeated defoliation is expected to deplete the plants' resource pools, and thereby to reduce the plants' ability to express tolerance to grazing (del-Val and Crawley 2005). Reduction of individual size, and thereby a shift in stage distribution towards smaller plants under high sheep densities could, therefore, be expected to reduce k (Knight 2004;Ehrlén 1995b), as survival, fecundity and clonal reproduction rates all increase with size.…”

Section: Discussionmentioning

confidence: 99%

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Effects of sheep grazing and temporal variability on population dynamics of the clonal herb Geranium sylvaticum in an alpine habitat

et al. 2011

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An improved understanding of population-level consequences of grazing on plants can be facilitated by an assessment of grazing effects on all stages in the life-cycle. In this study, 6 years of demographic data for three populations of the perennial herb Geranium sylvaticum were analysed. We examined the effects of sheep grazing (high sheep density, low sheep density and no sheep) and interannual climatic variability on vital rates and population growth rates (k). Grazing did not affect survival or flowering rates, but reduced rates of growth and increased rates of clonal reproduction. At the population level, high contributions from retrogression and clonal reproduction buffered reduced rates of growth and stasis, and no consistent differences in k between populations exposed to different sheep densities were found. Instead, large betweenyear variability in k, independent of sheep density, was detected, related to variation in the local summer climate. The results indicated, however, that grazing effects on k were more severe in unfavourable than in normal years. Our study highlights that increased clonal reproduction rates functioned as a tolerance mechanism towards grazing in this herb, which forms a mechanism to explain how moderate population responses to grazing in some herbs can arise.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effects of sheep grazing and temporal variability on population dynamics of the clonal herb Geranium sylvaticum in an alpine habitat

et al. 2011

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“…The expression of these relationships results from an interaction with the level of resource availability (Ferraro and Oesterheld 2002;Wise and Abrahamson 2005). For example, high tissue turnover and resource acquisition rates are important strategies for plants with high growth rates (del-Val and Crawley 2005) and occurring at high resource availability (Grime et al 1997).…”

Section: Introductionmentioning

confidence: 99%

Do Clonal and Bud Bank Traits Vary in Correspondence with Soil Properties and Resource Acquisition Strategies? Patterns in Alpine Communities in the Scandian Mountains

et al. 2010

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Plant traits associated with resource acquisition strategies (specific leaf area (SLA), leaf dry matter content (LDMC), leaf size and plant height) change along gradients of soil properties, being the most conservative in a resource-poor environment and the most dynamic in a resource-rich environment. Clonal attributes also vary along soil and other environmental conditions. We hypothesized that in alpine communities in the Scandian Mts. (1) the average composition of traits in a plant assemblage in terms of i) the predominance of different clonal growth organ types, ii) the number of buds in the bud bank, iii) the distribution of the bud-bank (above-and below ground), iv) the distance of lateral spread and v) the longevity of plant -offspring connections would change along a gradient of soil properties and (2) that this variation would be in correspondence with that of traits associated with resource acquisition strategies (SLA, LDMC, leaf size and plant height). Analysis of clonal and bud bank traits for species of alpine communities supported our first hypothesis: with decreasing soil quality the most common clonal growth organs were rhizomes, and there was a predominance of perennial bud banks located at the soil surface or below-ground, low rates of lateral spread and long persistence of plant -offspring connections. Our second hypothesis was partly supported. As predicted, at the level of the plant assemblage, these clonal and bud bank traits were positively associated with LDMC, and negatively with leaf size and plant height. These observations reinforce the hypotheses about trade-offs between acquisition and retention strategies in plants. The only result that was in contradiction with our expectations was the lack of correspondence between clonal and bud bank traits and SLA that could be attributed to errors associated to Folia Geobot (2011) 46:237-254 DOI 10.1007

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“…Frutas e vegetais são fontes ricas em compostos bioativos de grande potencial, que atuam como antioxidante e na prevenção de doenças degenerativas (DENNY & BUTTRISS, 2005).…”

Section: Polifenois Presentes Na Dietaunclassified

“…Algumas destas espécies podem se tornar escassas, pela ocorrência da herbivoria de outras espécies (DEL-VAL & CRAWLEY, 2005).…”

Section: Alocaçãounclassified

Monitoramento sazonal da atividade antioxidante das folhas de Erythroxylum suberosum A.St.-Hil. : correlação com o teor de hiperosídeo e isoquercitrina

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Are grazing increaser species better tolerators than decreasers? An experimental assessment of defoliation tolerance in eight British grassland species

Cited by 124 publications

References 66 publications

Effects of sheep grazing and temporal variability on population dynamics of the clonal herb Geranium sylvaticum in an alpine habitat

Effects of sheep grazing and temporal variability on population dynamics of the clonal herb Geranium sylvaticum in an alpine habitat

Do Clonal and Bud Bank Traits Vary in Correspondence with Soil Properties and Resource Acquisition Strategies? Patterns in Alpine Communities in the Scandian Mountains

Monitoramento sazonal da atividade antioxidante das folhas de Erythroxylum suberosum A.St.-Hil. : correlação com o teor de hiperosídeo e isoquercitrina

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