Are invaders disturbance-limited? Conservation of mountain grasslands in Central Argentina

Petryna, L.; Moora, Mari; Nunes, Cátia; Cantero, Juan José; Zobel, Martin

doi:10.1658/1402-2001(2002)005[0195:aidcom]2.0.co;2

Cited by 13 publications

(21 citation statements)

References 30 publications

(29 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These results partially disagree with the general hypothesis that relates the availability of resources or diversity with plant invasibility (Rejmá nek 1989;Hobbs and Huenneke 1992;Plant Ecol (2007) 193:279-291 287 Tilman 1997Davis et al 2000), indicating the influence of many other variables besides available resources or plant diversity controlling alien recruitment. Our results also partially differ from those obtained by Petryna et al (2002) in similar nearby natural grasslands of central Argentina, suggesting that establishment of six alien plants, including C. vulgare, depends on local disturbances. Nevertheless, these authors found that aboveground plant biomass removal alone does not produce suitable gaps for regeneration from seeds and that additional soil disturbance is necessary to enhance seedling establishment.…”

Section: Soil Disturbance and Seedling Recruitmentcontrasting

confidence: 99%

“…Both species are biennial herbs of Eurasian origin (Klemow and Raynal 1981;Michaux 1989;Klinkhamer and De Jong 1993), and form persistent seed banks (Turkington et al 1978;Doucet and Cavers 1997), but differ in life history traits and germination requirements. Cirsium vulgare has a very widespread distribution in lowlands, particularly in disturbed or abandoned fields, and has been reported to be naturalized in highland sites that are similar to the study area, 200 km to the south (Petryna et al 2002). Seeds bear a pappus that enables wind dispersal, although most fall within a few meters of the parent plant (Michaux 1989).…”

Section: Study Speciesmentioning

confidence: 84%

“…Furthermore, the presence of exotic species is still restricted to patches subjected to disturbance, such as ploughing (Díaz et al 1990) and burning (Menghi et al 1993), and along roadsides (unpublished data), suggesting that alien species are disturbance-limited. Recent observations made by Petryna et al (2002) in similar grasslands found that, in a seed addition experiment, different disturbances are needed to ensure the recruitment of six common alien species.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Alien seedling recruitment as a response to altitude and soil disturbance in the mountain grasslands of central Argentina

2007

View full text Add to dashboard Cite

Climate and disturbance are considered key factors in explaining plant invasion, mainly by their effect on alien seedling recruitment. We tested whether soil disturbance by digging and altitude, as a sub-set of climate, affected the seedling recruitment of two alien species (Cirsium vulgare and Melilotus alba) in the mountain grasslands of central Argentina. We performed a seed-addition factorial experiment with altitude as a fixed factor co-variable (6 levels), time since sowing (6 levels) as an autoregressive co-variable, and soil disturbance by digging (two levels) and seed addition (two levels) as fixed factors. Seeds of the studied species were sown in replicated undisturbed and disturbed soil plots, in grassland stands located every 200 m from 1200 to 2200 m a.s.l. The number of emerging seedlings at each plot was recorded during a period of 8 months, at intervals of 30-60 days. Seedlings of both alien species emerged at all the studied altitudes, but only the recruitment of C. vulgare increased linearly with altitude. Moreover, the time window of seedling recruitment for this species increased with altitude. Soil disturbance produced a significant decrease in overall seedling emergence of both species; however, an increase in emergence was observed for C. vulgare at an altitude over 2000 m a.s.l. Natural emergence inside control plots without seed addition was only observed for Cirsium vulgare, which indicates that this species was not seed limited. Our results show that altitude and the absence of disturbance do not restrict the recruitment of C. vulgare and M. alba in these natural mountain grasslands. Moreover, these alien species seem to be tolerant to and even favoured by conditions occurring at higher altitudes and in absence of micro-site soil disturbances in the Có rdoba mountain grasslands.

show abstract

Section: Soil Disturbance and Seedling Recruitmentcontrasting

confidence: 99%

Section: Study Speciesmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Alien seedling recruitment as a response to altitude and soil disturbance in the mountain grasslands of central Argentina

2007

View full text Add to dashboard Cite

show abstract

“…Abundance and distribution were extracted from different phytosociological studies already carried out Cantero, 1985a,b,c, 1989;Cantero and Bianco, 1986a,b;Bianco et al, 1987;Cantero and Nuñez, 1994a,b;Cantero et al, 1996Cantero et al, , 1999Cantero et al, , 2000Cantero et al, , 2001Cantero et al, , 2003Cantero et al, , 2004Nuñez et al, 1998Nuñez et al, , 2002González et al, 1998González et al, , 1999González et al, , 2002aPetryna et al, 1999Petryna et al, , 2002Amuchastegui et al, 2003). In order to express the relative abundance of the different species, the Braun-Blanquet scale (BB) (1979) was converted into the following qualitative combined scale for this work (Table 1): r or + from BB is very rare; 1 from BB is rare; 2 from BB is fairly abundant; 3 from BB is abundant; and 4-5 from BB is very common.…”

Section: Ethnobotanical Datamentioning

confidence: 99%

Medicinal plants from the “Sierra de Comechingones”, Argentina

Goleniowski

Bongiovanni

Palacio

et al. 2006

Journal of Ethnopharmacology

Self Cite

133

View full text Add to dashboard Cite

“…A few studies have addressed invasions by herbaceous species in the area (Díaz et al 1994;Petryna et al 2002;Cantero et al 2003;Paiaro et al 2007, in press), but none of them consider the incipient spread of woody alien species from lower altitudes. Because most introduced woody species were originally planted below 1,500 m asl., and at present are successful invaders of low-mountain ecosystems (Tecco 2006;Tecco et al 2010;Hoyos et al in press), the lowlands surrounding the Córdoba Mountains, represent an important source of propagule pressure of alien species towards higher altitudes.…”

Section: Introductionmentioning

confidence: 99%

Factors associated with woody alien species distribution in a newly invaded mountain system of central Argentina

et al. 2010

View full text Add to dashboard Cite

To help determine the major factors associated with alien plant in a newly invaded mountain range; we analyzed the distribution patterns of woody alien species along the altitudinal gradient of the Córdoba mountains, in relation to biotic, abiotic and anthropogenic factors. We selected 303 plots using a Geographic Information System (GIS) covering all the variability of these factors. In the field we registered woody alien occurrence in these 303 and in 303 additional neighbor plots. We used 12 biotic, abiotic and anthropogenic variables from the GIS to predict the probability of presence of alien species through a logistic model. Then, we analyzed if neighbor alien occurrences could explain some additional variance. We created a probability map with 4 categories of alien occurrence which was then validated by new field sampling. Occurrence of woody aliens was highest in the eastern slope (with longer history of species introduction), at low altitudes, near sources of propagule pressure (human settlements, roads and neighbor sites with established alien plants), and associated to sheltered topographies. In the upper belt of the Córdoba Mountains woody invasion is incipient and thus in a transient stage. Accordingly, propagule pressure seems to be the major factor at play, while the relevance of disturbance and biotic interactions is less clear.

show abstract

Are invaders disturbance-limited? Conservation of mountain grasslands in Central Argentina

Cited by 13 publications

References 30 publications

Alien seedling recruitment as a response to altitude and soil disturbance in the mountain grasslands of central Argentina

Alien seedling recruitment as a response to altitude and soil disturbance in the mountain grasslands of central Argentina

Medicinal plants from the “Sierra de Comechingones”, Argentina

Factors associated with woody alien species distribution in a newly invaded mountain system of central Argentina

Contact Info

Product

Resources

About