Changes in mediterranean shrub communities with Cytisus purgans and Genista scorpius

Derussche, M.; Escarr�, J.; Lepart, Jacques

doi:10.1007/bf00121019

Cited by 28 publications

(22 citation statements)

References 23 publications

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“…The interactions relate to how colonizing and dominant plants influence other simultaneously established species and subsequent invaders. These models have been criticized for being "overly simplistic" (Christensen and Peet 1981, p. 239) and changing as the vegetation develops (Debussche et al 1980;Kimmins 1997, p. 408;Tonioli et al 2001;Brockerhoff et al 2003). However, the tolerance model appeared to best characterize species interactions within the clearcut vegetation.…”

Section: Discussionmentioning

confidence: 91%

Secondary vegetation and floristic succession within a boreal aspen (Populus tremuloides Michx.) clearcut

Strong¹

2004

Can. J. Bot.

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The composition and abundance of vascular plants within a boreal Populus tremuloides Michx. stand in west-central Alberta were assessed three, five, nine, and 20 years after clearcutting. Rapid re-establishment of Populus tremuloides and other species such as Amelanchier alnifolia (Nutt.) Nutt. ex M. Roemer and Rosa acicularis Lindl. occurred primarily in response to vegetative propagation. Some minor compositional variability occurred among the year 3 plots (n = 88), but they were considered members of the same plant community, with 88% of the plots undergoing similar developmental processes during the course of the study. Some dominant species substantially increased in canopy cover, although most species maintained a relatively consistent level of abundance over time. Floristic richness was similar in year 3 (64 species) and year 20 (62 species) with the survival of 52 initiating species in year 20. The variability in floristic richness included the invasion of 32 species and the extirpation of 34 species. Stand development over a 20-year period best fit a tolerance model of succession because of the rapid development of dominant species, the lack of a major understory composition change, and a similar degree of dominance concentration among species. Understory vegetation growth was constrained by overstory shading.Résumé : Les auteurs ont examiné la composition et l'abondance des plantes vasculaires dans un peuplement boréal de Populus tremuloides Michx., du centre ouest de l'Alberta, trois, cinq, neuf et vingt ans après la coupe à blanc. Le repeuplement rapide par le Populus tremuloides et autres espèces, telles que l'Amelanchier alnifolia (Nutt.) Nutt. ex M. Roemer et le Rosa acicularis Lindl., provient surtout de leur propagation végétative. On a observé des variabilités mineures de composition dans les parcelles de 3ième année (n = 88), mais on peut les considérer comme membres d'une même communauté végétale, avec 88 % des parcelles subissant des processus de développement similaires au cours de l'étude. Certaines espèces dominantes augmentent de façon substantielle dans la formation de la canopée, bien que la plupart des espèces maintiennent un degré relativement constant d'abondance avec le temps. La richesse floristique observée est semblable à la 3ième (64 espèces) et à la 20ième année (62 espèces), avec la survie de 52 des espè-ces initiales jusqu'à la 20ième année. La variabilité de la richesse floristique inclut l'invasion par 32 espèces et l' expulsion de 34 espèces. Le développement du peuplement au cours de la période de 20 ans correspond à un modèle de tolérance de succession lié au développement rapide des espèces dominantes, au manque de modification majeure dans la composition des sous-étages, et à un degré comparable de concentration de dominance entre les espèces. La végétation de sous-bois est contrainte par l'ombre des étages supérieurs.

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Section: Discussionmentioning

confidence: 91%

Secondary vegetation and floristic succession within a boreal aspen (Populus tremuloides Michx.) clearcut

Strong¹

2004

Can. J. Bot.

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“…) reports that the fruit of Rhus are taken only after higher quality fruit are exhausted or during periods of unusual food shortage in late winter. The importance of invasion patterns on distance from source and the mode of dispersal, including dispersal agent and attractiveness of the fruit, has been shown by Debussche et al (1980).…”

Section: -mentioning

confidence: 99%

“…The different cover curves of wind and animal dispersed species (Figs. 6,9,10) indicate the importance of the difference between the two dispersal modes (see Debussche et al, 1980). Viburnum dentatum, Quercus spp.…”

Section: -mentioning

confidence: 99%

Population patterns through twenty years of oldfield succession

1982

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Using 48 permanent, 0.5 X 2.0 m quadrats, changes in species composition and cover were followed in an oldfield abandoned after plowing in the spring of 1960. Twenty years of data collected since then show the succession to be individualistic, that is, composed of broadly overlapping population curves through time. In general, the population curves exhibit long, persistent tails, indicating that, through this time span, succession is a process in which species that are present for much of the time become dominant at different times. Invasion and extinction are not the major mechanisms of community change. Bi-or multi-modal peaks were discovered in some species, but there is no clear explanation of such patterns yet. Many species which are important later in the sequence invade early. Information on the biologies of representative species from early, middle, and late portions of the sequence are correlated with the population patterns. In particular, the mode of dispersal, life cycle, germination behavior, ~ind assimilation requirements are related to species positions. However, there is need for coordinated, comparative study of species strategies as well as experimental study of species interactions in order to more fully understand the mechanisms of this succession. The patterns discovered in this oldfield are compatible with contemporary concepts of succession as an organism-based phenomenon, in which probabilistic gap creation and filling are critical.

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“…This legume shrub is a shade-intolerant species that spreads in sites with low overstory cover (Gracia et al 2007), and so is especially abundant in grasslands. After fire, C. balansae resprouts vigorously and also regenerates from seed (Debussche et al 1980). Despite being widespread in southern European mountain grasslands, to date little is known about the process of encroachment by Cytisus in different grassland communities.…”

Section: Study Sitementioning

confidence: 98%

“…Management techniques such as prescribed burning or mechanical thinning are commonly applied to control the surface area occupied by this shrub. Adult Cytisus is very seldom grazed by domestic animals, except when the grass is wet (Debussche et al 1980), but non-adult Cytisus is more palatable and is grazed by domestic animals (field observation).…”

Section: Introductionmentioning

confidence: 98%

Spatial patterns of shrub encroachment in neighbouring grassland communities in the Pyrenees: floristic composition heterogeneity drives shrub proliferation rates

et al. 2010

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We studied the role of floristic composition and associational resistance in shrub dynamics by comparing spatial patterns of shrub cover after prescribed burning in neighbouring grassland communities with different palatability. The study focused on the shrub Cytisus balansae ssp. europaeus (G. López and Jarvis) Muñoz Garmendia. Seven two-dimensional transects (20 9 0.5 m) were established to monitor shrub cover for at least 10 years after prescribed burning. Shrub cover and spatial patterns were assessed in each transect. Floristic similarity between transects and Cytisus associations with different species were estimated. Over an entire transect, shrub cover and shrub scale of pattern and patch size were lowest in the unpalatable Festuca eskia grasslands and highest in F. paniculata grasslands. At short distances, we found negative associations between Cytisus and most of the grasses, except for F. nigrescens and Agrostis capillaris, which showed positive associations with Cytisus. Thus, the effects of associational resistance on shrub encroachment were not as marked as expected, F. eskia grasslands showing the lowest shrub encroachment rates after fire. By contrast, Cytisus was positively associated with the most palatable grasses in the site, namely F. nigrescens and A. capillaris. We conclude that differences in floristic composition drive shrub encroachment rates in these spatially heterogeneous communities.

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Changes in mediterranean shrub communities with Cytisus purgans and Genista scorpius

Cited by 28 publications

References 23 publications

Secondary vegetation and floristic succession within a boreal aspen (Populus tremuloides Michx.) clearcut

Secondary vegetation and floristic succession within a boreal aspen (Populus tremuloides Michx.) clearcut

Population patterns through twenty years of oldfield succession

Spatial patterns of shrub encroachment in neighbouring grassland communities in the Pyrenees: floristic composition heterogeneity drives shrub proliferation rates

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