References of "Cristofoli, Sara"
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See detailColonization Credit in Restored Wet Heathlands
Cristofoli, Sara ULg; Piqueray, Julien ULg; Dufrêne, Marc ULg et al

in Restoration Ecology (2010), 18(5), 645-655

Although human-driven landscape modification is generally characterized by habitat destruction and fragmentation, it may also result in the creation of new habitat patches, providing conditions conducive ... [more ▼]

Although human-driven landscape modification is generally characterized by habitat destruction and fragmentation, it may also result in the creation of new habitat patches, providing conditions conducive to spontaneous colonization. In this article, we propose the concept of ‘‘colonization credit’’ (i.e., the number of species yet to colonize a patch, following landscape changes) as a framework to evaluate the success of colonization, in terms of species richness, in new/restored habitats, taking into account the spatial structure of landscapes. The method mirrors similar approaches used to estimate extinction debt in the context of habitat fragmentation, that is, comparisons, between old and new habitat patches, of the relationships among spatial patch metrics and patch species richness. We applied our method to the case of spontaneous colonization of newly created habitat patches suitable for wet heathland plant communities in South Belgium. Colonization credit was estimated for the total species richness, the specialist species richness, and the species richness of three emergent groups (EGs) of specialist species, delineated on the basis of dispersal traits. No significant colonization credit was identified either in patches created 25–55 years ago or in those created within the past 25 years, with the exception of species from our first EG (mostly anemochorous species with long-term persistent seed bank). However, the differential response of species in that first EG could not be explained through their characteristic life history traits. The results of this study are encouraging and suggest that deliberate, directed restoration activities could yield positive developments in a relatively short period of time. [less ▲]

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See detailRestauration écologique: contexte, contraintes et indicateurs de suivi
Cristofoli, Sara ULg; Mahy, Grégory ULg

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2010), 14(1), 203-211

Dans un contexte global de perturbations anthropiques toujours croissantes des écosystèmes naturels et semi-naturels, l’unique conservation de ces écosystèmes ne suffit plus. La restauration écologique ... [more ▼]

Dans un contexte global de perturbations anthropiques toujours croissantes des écosystèmes naturels et semi-naturels, l’unique conservation de ces écosystèmes ne suffit plus. La restauration écologique peut ainsi se révéler un complément essentiel à la conservation s.l. L’article consiste en une synthèse de la littérature scientifique dédiée aux concepts de la restauration écologique. Nous abordons la notion d’objectifs de la restauration notamment au travers de la référence écologique. Outre la définition d’objectifs clairs de restauration, la référence permet ensuite d’évaluer les efforts de restauration, par le biais d’indicateurs de suivi. Les indicateurs peuvent par ailleurs fournir des informations quant aux attributs de l’écosystème restauré et/ou la trajectoire écologique empruntée. Les éventuelles contraintes rencontrées par les espèces au travers de filtres à la restauration pourront être détectées et des mesures de compensation adéquates pourront être proposées. [less ▲]

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See detailSpider communities as evaluation tools for wet heathland restoration
Cristofoli, Sara ULg; Mahy, Grégory ULg; Kekenbosh, Robert et al

in Ecological Indicators (2010), 10

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See detailColonisation credit in recent wet heathland butterfly communities
Cristofoli, Sara ULg; Mahy, Grégory ULg

in Insect Conservation and Diversity (2010), 3

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See detailSpecies response to the fragmentation and restoration of wet heathlands and associated habitats in High Ardenne (Belgium) – A multi-taxonomic approach
Cristofoli, Sara ULg

Doctoral thesis (2009)

The impact of habitat fragmentation and the success of habitat restoration were studied through a multi-taxonomic approach. The response to landscape structure and/or habitat quality of three taxonomic ... [more ▼]

The impact of habitat fragmentation and the success of habitat restoration were studied through a multi-taxonomic approach. The response to landscape structure and/or habitat quality of three taxonomic groups was explored, in (semi-)natural habitats. The three taxonomic groups were complementary, both in terms of their specific life history traits and their place in the food chain. We considered autotrophic species (vascular plants), herbivores (butterflies) and predators (spiders). Life-history traits and species specialization for target habitat were used to refine the analysis. Target habitat was a complex of wet heathlands, poor fens and bogs. Patches of this complex of habitats were sampled on two high plateaus in the Belgian Ardenne, the Plateau de Saint-Hubert and the Plateau des Tailles. Over the last 250 years, two jointly acting habitat dynamics were observed in these areas: a loss of area (and connectivity) on the one hand but also the creation of new habitat patches. It is precisely this double dynamics that enabled us to analyze and develop concepts linked to the response of species faced with spatio-temporal modifications of their habitat. Specifically, in this work we focused on the comprehension of two unbalanced situations, affecting the relationships between species richness and patch characteristics. A first unbalanced situation, the extinction debt, was observed for vascular plant communities. On the opposite, a colonization credit, the second unbalanced situation, was noted for butterflies and seemed to mainly affect specialist species. Specialist species of the three taxonomic groups showed relatively contrasted responses compared to generalist species. However, the life-history traits we studied only slightly influenced the response of species at the community level, excepted for pioneer communities in habitat patches less than 5 years old. [less ▲]

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See detailResponse of spider communities to habitat restoration in a wet heathland complex
Cristofoli, Sara ULg; Kekenbosch, Robert; Mahy, Grégory ULg

Poster (2008, September)

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See detailPlant species extinction debt in a biodiversity hotspot: community and species approaches
Piqueray, Julien ULg; Bisteau, Emmanuelle ULg; Cristofoli, Sara ULg et al

in Belgian Journal of Botany (2008), 141(2), 189

Destruction and fragmentation of natural and semi-natural habitats are considered as major threats for plant species richness. However, the response of plant species richness to habitat alteration is ... [more ▼]

Destruction and fragmentation of natural and semi-natural habitats are considered as major threats for plant species richness. However, the response of plant species richness to habitat alteration is sometimes delayed. This delay induces an extinction debt in plant communities that are thus prone to undergo species extinctions in the following years. Several methodologies were proposed to detect this extinction debt and estimate the mean number of species yet to disappear. In this study, we developed a new methodology for the estimation of the extinction debt extent. Moreover, we proposed a species approach aimed at determining which species are more sensitive to extinction as a consequence of habitat destruction and fragmentation. Finally, we explored the colonization ability of habitat specialist species. This aspect is of fi rst importance to counteract local species extinctions. Our model habitat is calcareous grasslands of Southeast Belgium that have suffered an important fragmentation process since the beginning of the twentieth century. We estimated that the mean extinction debt of the calcareous grassland patches was ca. 24 species, including ca. six specialist species. We showed that 16 of the 46 specialist species did not meet their area requirement anymore and were therefore considered as sensitive to extinction. However, the species composition of the more recent grasslands indicates a non-negligible recolonization potential of specialist species. There is thus a real possibility to reduce extinction risk by restoring suitable habitats. [less ▲]

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See detailElements linéaires
Monty, Arnaud ULg; Cristofoli, Sara ULg

Learning material (2008)

De toutes parts, notre paysage est traversé par des éléments linéaires. Certains divisent l'environnement en fragments de plus en plus isolés, entravant le déplacement de nombreux être vivants. Mais d ... [more ▼]

De toutes parts, notre paysage est traversé par des éléments linéaires. Certains divisent l'environnement en fragments de plus en plus isolés, entravant le déplacement de nombreux être vivants. Mais d'autres jouent, au contraire, un rôle favorable... Ce sont notamment les haies et les cordons arbustifs... [less ▲]

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See detailLa Balsamine et les Hommes
Monty, Arnaud ULg; Cristofoli, Sara ULg

Learning material (2007)

Les invasions biologiques sont actuellement considérées comme l’une des atteintes majeures à la biodiversité. Néanmoins, elles sont encore souvent mal perçues du grand public. Ce court-métrage s’inscrit ... [more ▼]

Les invasions biologiques sont actuellement considérées comme l’une des atteintes majeures à la biodiversité. Néanmoins, elles sont encore souvent mal perçues du grand public. Ce court-métrage s’inscrit dans ce contexte et présente le cas de la Balsamine géante (Impatiens glandulifera ROYLE), espèce très esthétique, mais aussi particulièrement dommageable pour la flore des berges de cours d’eau, dans son aire d’invasion. La Balsamine fut introduite en Europe il y a plus d’un siècle, depuis les hauts-plateaux indiens et l’Himalaya, pour ses qualités décoratives. Après une phase de latence, elle a commencé à se répandre dans les milieux naturels, favorisée par les perturbations anthropiques et par un engouement des jardiniers pour l’espèce. Actuellement, elle est devenue problématique dans plusieurs vallées belges comme celle de l’Ourthe, l’Amblève ou la semois. Dans ce court-métrage, sous forme de fable, la Balsamine nous conte l’histoire de son invasion, tantôt aidée, tantôt enrayée par l’Homme. Le texte, entièrement original, est basé sur les connaissances les plus actuelles de l’espèce et des mécanismes sous-jacents à l’invasion. L’objectifs des réalisateurs est d’interpeller le spectateur sur la problématique tout en lui suggérant des actions préventives. [less ▲]

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