Demography and Growth Forms of the Clonal Perennial Rubia Peregrina in Mediterranean Vineyard and Unmanaged Habitats

Navas, M. L.; Garnier, Éric

doi:10.2307/2260893

Cited by 29 publications

(26 citation statements)

References 29 publications

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“…The 29 records showed that short spacers were associated with high branching rate while long spacers were associated with low branching rate. This result is in clear accordance with numerous previous studies reporting on the classical trade-off between the length and the number of connections in clonal growth forms (Lovett Doust 1981;Bell 1984;Navas and Garnier 1990). Independently, the records were patterned following the number of clumping tillers, leading up to the fact that this trait was more than just null length of spacer.…”

Section: Phalanx-guerrilla Continuumsupporting

confidence: 92%

On the Relationship Between Clonal Traits and Small-Scale Spatial Patterns of Three Dominant Grasses and its Consequences on Community Diversity

Pottier

Évette

2009

Folia Geobot

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In a secondary successional community, we focused on the role of local dispersion mediated by clonal growth in the density and spatial patterning of tillers of three dominant grass species (Elymus repens, Brachypodium pinnatum and Calamagrostis epigejos) on the plant neighbourhood scale. We also asked whether the spatial pattern/density of their tillers were linked to the local diversity structure. In ten 75 cm×75 cm quadrats for each of the three species, we quantified i) the clonal morphology patterns from measuring spacer length, branching rate and the number of clumping tillers per module, ii) the spatial patterns and density of tillers in grids at four different resolutions (cell sizes varied between 1 cm×1 cm; 2.5 cm× 2.5 cm; 5 cm×5 cm and 7.5 cm×7.5 cm), and iii) local species richness and local dominance based on botanical relevés. Then, we explored the relationships between iv) the clonal architecture pattern and the density/spatial pattern of tillers and v) the density/spatial pattern of tillers and local diversity variables, through regression analyses. Aggregation intensity on the smallest scales and tiller density were negatively linked to spacer length and positively linked to branching rate and number of clumping tillers. Species richness and dominance in quadrats were negatively and positively linked to tiller density, respectively. Dominance was positively linked to aggregation intensity on a 1-cm scale. This study emphasized and quantified the importance of clonal growth in the intensity and quality of grass tiller patterning in space on the plant neighbourhood scale. Our approach allowed the accurate positioning of species, or even clones on the phalanx-guerrilla continuum. This should help us to understand how dominant grass species affect the dynamics of stand communities.

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Section: Phalanx-guerrilla Continuumsupporting

confidence: 92%

On the Relationship Between Clonal Traits and Small-Scale Spatial Patterns of Three Dominant Grasses and its Consequences on Community Diversity

Pottier

Évette

2009

Folia Geobot

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“…Greater persistence and reduced initiation of ramets support the generalization that in environments with very low resource availability, as in the understory of our young, closed-canopy stands, survival of existing structures takes precedence over formation of new modules. Reduced ramet formation in clonal herbs frequently results from low light (Ashmun and Pitelka 1984;Pitelka et al 1985;Navas and Garnier 1990;Salonen 1994;Whitman et al 1998), but more generally reflects the small size and poor vigor of plants Cain and Damman 1997;Wijesinghe and Whigham 1997) that could result from limitation by one or more resources in young, closed-canopy stands. Within each of the more open forest types, short-shoot frequencies declined markedly with age, suggesting fairly rapid turnover.…”

Section: Age Structure and Demographymentioning

confidence: 99%

Clonal development of Maianthemum dilatatum in forests of differing age and structure

Lezberg¹,

Halpern²,

Antos³

2001

Can. J. Bot.

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Abstract:The development of a dense tree layer in young coniferous stands can suppress understory plants, leading to very low herb abundance and diversity. In this study, clonal development of the rhizomatous herb Maianthemum dilatatum (Wood) Nels & Macbr. was compared among four types of coniferous forest (young, closed canopy; young, silviculturally thinned; mature; and old growth) on the western Olympic Peninsula, Washington. We predicted that (i) ramet turnover would be lowest, (ii) clonal fragment size would be smallest, and (iii) allocation of resources to leaves would be greatest in young, closed-canopy forests, and that these traits would increase (or decrease for leaves) as understory conditions became more favorable with stand development or thinning. The low frequency of new ramets in young, closed-canopy stands supported the first prediction. The second prediction was also supported: lateral spread and rhizome mass were smallest in these stands. However, allocation to leaves was not higher in dense young stands, indicating that Maianthemum does not respond to stress by increased investment in leaves. Clonal fragments in thinned, mature, and old stands showed no differences in traits, suggesting that once tree canopies rise, canopy gaps form, or young stands are thinned, resource levels are favorable for clonal growth. Maianthemum appears to persist in dense, young stands by maintaining long-lived ramets that produce leaves annually, rather than by increasing rhizome spread, rhizome storage, or allocation to leaves.Key words: age structure, biomass allocation, canopy closure, forest herb, rhizome.Résumé : Le développement d'une dense canopée dans les jeunes peuplements de conifères peut supprimer la végéta-tion de sous-bois et conduire à de très faibles abondances et diversités de petites plantes herbacées. Dans cette étude, les auteurs comparent le développement clonal d'une plante herbacée, le Maienthemum dilatatum (Wood) Nels & Macbr., dans quatre types de forêts conifériennes (jeune à canopée fermée, jeune éclaircie par sylviculture, mature, surannée), situés dans la péninsule Olympique occidentale de l'état de Washington. Les auteurs ont prédit que (i) le cyclage des ramettes serait le plus faible, (ii) la dimension des rameaux clonaux serait la plus faible, et (iii) l'allocation aux feuilles serait la plus élevée dans les jeunes forêts à canopée fermée, et que ces caractéristiques augmenteraient (ou diminueraient) à mesure que les conditions de sous-bois deviendraient plus favorables avec le développement ou l'éclairci du peuplement. La faible fréquence des nouvelles ramettes dans les peuplements jeunes à canopée fermée supportent la première prédiction. La seconde prédiction s'avère également juste : le développement latéral et la masse de rhizome sont plus faibles dans ces peuplements. Cependant, l'allocation aux feuilles n'est pas plus forte dans les jeunes peuplements denses, ce qui indique que le Maienthemum ne réagit pas à l'ombrage par un investissement accru dans les feuilles. Les fragme...

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“…This indicates that clones of B. pinnattim intermingle in the Hekl despite their phalanx-like growth form which rather suggests compact clone shapes (de Kioon and Knops 1990). Given the old ages of clones, initially compact clones may gradually have developed less integrated and more spacious growth Ibinis with intermingling ramets (Maddox et al 1989. Navas and Gamier 1990.…”

Section: Loiial Diversitymentioning

confidence: 99%

An isozyme study of clone diversity and relative importance of sexual and vegetative recruitment in the grass Brachypodium pinnatum

Schläpfer¹,

Fischer²

1998

Ecography

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We asked whether differences in abundance and seed prodtiction of Brachypodium pinnatum after 16 yr of four different experimental land use regimes were reflected in differences in vegetative dispersal distance, clone diversity, clone area, and the proportions of sexual and vegetative recruitment. Mean vegetative dispersal distance was 5.5 mm yr‘. Electrophoresis of 5 polymorphic isozyme loci of 20 tillers sampled at defined positions in each of twelve 1 × 6 m sampling areas (3 per treatment) revealed considerable clonal diversity. Per sampling area we found on average 9.98 enzyme phenotypes (clones), mean Simpson index was 0.825. and mean Shannon index 0.801. The mean ratio of sexual vs vegetative recruitment was about 1:32000. Despite this low ratio, clonal diversity within the population of” B. pinnatum was higher than reported for other clonal plant populations, possibly because of its high ramet densities. Moan clone area was 5.73 m2‐. i.e. mean clone radius was 1.35 m. None of the 10 pairwise correlations between abundance and seed production on the one hand, and number of clones per plot sample, plot Simpson index, plot Shannon index, ratio of vegetative vs sexual recruitment, and clone area on the other, was significant. Mean clone radius was 245 times larger than the mean distance of yearly vegetative dispersal which suggests old ages and low turnover rates of clones. The time scale of the inert response of clonal diversity of B. pinnatum to changes in land use appears to largely exceed the experimental period of 16 yr.

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Demography and Growth Forms of the Clonal Perennial Rubia Peregrina in Mediterranean Vineyard and Unmanaged Habitats

Cited by 29 publications

References 29 publications

On the Relationship Between Clonal Traits and Small-Scale Spatial Patterns of Three Dominant Grasses and its Consequences on Community Diversity

On the Relationship Between Clonal Traits and Small-Scale Spatial Patterns of Three Dominant Grasses and its Consequences on Community Diversity

Clonal development of Maianthemum dilatatum in forests of differing age and structure

An isozyme study of clone diversity and relative importance of sexual and vegetative recruitment in the grass Brachypodium pinnatum

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