References of "Andrello, Marco"
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See detailEffects of management regimes and extreme climatic events on plant population viability in Eryngium alpinum
Andrello, Marco; Bizoux, Jean-Philippe ULg; BARBET-MASSIN, morgane et al

in Biological Conservation (2012), 147(1), 99-106

Extreme climatic events like the 2003 summer heatwave and inappropriate land management can threaten the existence of rare plants. We studied the response of Eryngium alpinum, a vulnerable species, to ... [more ▼]

Extreme climatic events like the 2003 summer heatwave and inappropriate land management can threaten the existence of rare plants. We studied the response of Eryngium alpinum, a vulnerable species, to this extreme climatic event and different agricultural practices. A demographic study was conducted in seven field sites between 2001 and 2010. Stage-specific vital rates were used to parameterize matrix population models and perform stochastic projections to calculate population growth rates and estimate extinction probabilities. Among management regimes, spring grazing and land abandonment decreased vital rates and population growth, while autumn grazing and late mowing had positive effects on population viability. The 2003 heatwave reduced fecundity rates and survival rates. Only spring grazed sites presented considerable extinction risk. Stochastic projections showed that an increased frequency of 2003-like events may exacerbate extinction risk, but extinction probability depends mainly on land management regimes. To better conserve E. alpinum populations, we recommend conversion of presently spring grazed and abandoned sites to late mowing or autumn grazing. [less ▲]

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Peer Reviewed
See detailEffect of the 2003 heatwave on Eryngium alpinum demography under different management regimes
Bizoux, Jean-Philippe ULg; Andrello, Marco; Till-Bottraud, Irène

Conference (2011, September 28)

In the summer of 2003, Europe was impacted by an extreme heatwave that altered ecosystem productivity and increased plant mortality in natural areas. We analyse the effect of this extreme climatic event ... [more ▼]

In the summer of 2003, Europe was impacted by an extreme heatwave that altered ecosystem productivity and increased plant mortality in natural areas. We analyse the effect of this extreme climatic event on the demography of the protected alpine plant Eryngium alpinum in relation to local ecological conditions and management regimes (mowing, grazing and unmanaged). Spatiotemporal variation in the vital rates of different plant life-stages (seedlings, juveniles, vegetative and reproductive adults) was estimated in seven sites of E. alpinum in the French Alps between 2001 and 2010. The effects on population dynamics (deterministic and stochastic population growth rates, λ and a) were studied using matrix population models and life table response experiments. Reductions in survival rates were observed following the extreme 2003 summer. λ was smaller during the heatwave and a decreased in simulations where the occurrence probability of a 2003-like event was increased. Adult survival rates and fecundity were negatively affected by heavy spring grazing, leading to lower λ and a. There were few differences in population dynamics between mowed and unmanaged sites. While greater rates of heatwave occurrence did increase extinction probability, only heavily grazed sites showed considerable extinction risk. As a consequence, heavy spring grazing must be discouraged in sites where the conservation of E. alpinum is a priority, while it is important to quantify acceptable levels of grazing in semi-natural areas where plant conservation has to be achieved in accordance with human development needs. [less ▲]

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