Diversity and functional groups dynamics affected by drought and fire in Patagonian grasslands

Ghermandi, Luciana; Gonzalez, Sofía Laura

doi:10.2980/16-3-3264

Cited by 16 publications

(18 citation statements)

References 33 publications

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“…and Senecio bracteolatus Hook et Arnott (Ghermandi et al 2004). Vegetation cover is approximately 60% and the gaps (inter-tussock areas) are colonised by herbaceous species (Ghermandi & Gonzalez 2009). The most abundant native herbs are the annuals Triptilion achilleae Ruiz et.…”

Section: Study Areamentioning

confidence: 99%

Seed longevity and fire: germination responses of an exotic perennial herb in NW Patagonian grasslands (Argentina)

Franzese¹,

Ghermandi²

2011

Plant Biology

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Fire affects grassland composition by selectively influencing recruitment. Some exotic species can increase their abundance as a consequence of fire-stimulated seed germination, but response may depend on seed age. Rumex acetosella L. (Polygonaceae, sheep's sorrel) is a cosmopolitan herb that has invaded NW Patagonia's grasslands. This species forms persistent soil seed banks and increases after disturbances, particularly fire. We studied how fire and seed longevity influence R. acetosella germination. In 2008, we conducted laboratory experiments where we exposed different-aged seeds (up to 19 years old) to heat, smoke, charcoal, ash and control treatments. Total percentage germination and mean germination time depended on both seed age and fire treatment. Germination of younger seeds decreased with increasing temperature. There was no general pattern in germination responses of different-aged seeds to smoke, charcoal and ash. While smoke improved the germination of fresh seeds, charcoal decreased germination. Germination of untreated seeds was negatively correlated with seed age, and mean germination time increased with seed age. In most treatments, fresh seeds had lower germination than 1-5-year-old seeds, indicating an after-ripening requirement. Smoke stimulates R. acetosella germination, causing successful recruitment during post-fire conditions. Fresh seeds are particularly responsive to fire factors, possibly because they have not experienced physical degradation and are more receptive to environmental stimuli. Knowing the colonisation potential from the soil seed bank of this species during post-fire conditions will allow us to predict their impact on native communities.

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Section: Study Areamentioning

confidence: 99%

Seed longevity and fire: germination responses of an exotic perennial herb in NW Patagonian grasslands (Argentina)

Franzese¹,

Ghermandi²

2011

Plant Biology

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“…Grazing has led to a reduction in plant cover (Paruelo et al, 1993;Sala, 1988), decreased abundance of palatable species (Aguiar and Sala, 1998;Cingolani et al, 2005;Defossé et al, 1990;Soriano, 1983) and losses in the size and diversity of soil seed banks (Bertiller, 1992(Bertiller, , 1998Ghermandi, 1997;Ghermandi and Gonzalez, 2008).…”

Section: Introductionmentioning

confidence: 99%

Studying the post-fire performance of tussock grasses in Patagonia: Survival, biomass production and early competition

Gittins¹,

Ghermandi²,

Bran³

2011

Journal of Arid Environments

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“…), and by exotic herbs like Draba verna ((L.) Bess. ex Erophila verna), Holosteum umbellatum (L.), and Rumex acetosella (L.) (Ghermandi and Gonzalez, 2009). Bare soil ranges from 29% to 60%.…”

Section: Description Of the Puyehue-cord On Caulle Volcanic Complex Amentioning

confidence: 98%

“…Pre-eruption seed bank was estimated by the seedling emergence method from soil samples collected in April 2001, in 20 gaps from similar grasslands, and within the same vegetation community, located 3 km away from the current study area in the same paddock (Ghermandi and Gonzalez, 2009). Considering the similarity in plant community, meteorological conditions, and land management during the compared periods, we expected that the observed differences in the analyzed variables are mainly due to the effect of ash deposition.…”

Section: Pre-and Post-eruption Vegetation and Seed Bank Datamentioning

confidence: 99%

“…In Patagonian steppe, gaps (areas between tussock grasses and shrubs) are the recruitment microsites for dominant plant species (Defoss e et al, 1997;Franzese et al, 2009;Franzese and Ghermandi, 2012a,b), and also preserve herbaceous richness (Ghermandi and Gonzalez, 2009). For this reason we studied the early vegetation dynamics of gap microsites after the most recent eruption of the Puyehue-Cord on Caulle volcanic complex.…”

Section: Introductionmentioning

confidence: 99%

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Effects of volcanic ash deposition on the early recovery of gap vegetation in Northwestern Patagonian steppes

Ghermandi

Gonzalez

Franzese

et al. 2015

Journal of Arid Environments

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Diversity and functional groups dynamics affected by drought and fire in Patagonian grasslands

Cited by 16 publications

References 33 publications

Seed longevity and fire: germination responses of an exotic perennial herb in NW Patagonian grasslands (Argentina)

Seed longevity and fire: germination responses of an exotic perennial herb in NW Patagonian grasslands (Argentina)

Studying the post-fire performance of tussock grasses in Patagonia: Survival, biomass production and early competition

Effects of volcanic ash deposition on the early recovery of gap vegetation in Northwestern Patagonian steppes

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