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Colonization potential of an endangered riparian shrub species / Sabine Fink in Biodiversity and Conservation, vol. 26, n°9 (Août 2017)

Public [article]  inBiodiversity and Conservation > vol. 26, n°9 (Août 2017) . - pp. 2099–2114 Titre : Colonization potential of an endangered riparian shrub species Type de document : texte imprimé Auteurs : Sabine Fink, Auteur ; Tabea Lanz, Auteur ; Rebecca Stecher, Auteur ; Christoph Scheidegger, Auteur Année de publication : 2017 Article en page(s) : pp. 2099–2114 Langues : Anglais (eng) Catégories : [habitats/milieux] 2 - Milieux aquatiques non marins [habitats/milieux] ZH - Zones humides [Espèces (in biblio)] Myricaria germanica [ZG] Europe Mots-clés : communauté végétale  perte d'habitat  graine  germination  conservation Résumé : "Riparian areas and their plant communities are threatened due to human exploitation and habitat loss. Conservation of riparian vegetation requires knowledge on limiting factors in the biology of species preventing its spread along suitable areas. It needs to be assessed if an endangered species is trapped in an extinction vortex or whether it can recover from its current bottleneck situation by management measurements. We investigate the recovery potential of an endangered riparian shrub species of European rivers, the German tamarisk, Myricaria germanica, by combining field and lab experiments on seed production, germination and wind dispersal with a modelling approach on species distribution. While the seed potential is high, wind-mediated dispersal is average, with a majority of seeds falling next to the mother shrub. The modelled dispersal kernel shows highest goodness-of-fit with a polynomic function. Including this kernel in a model on the future distribution of the species based on identification of suitable habitat, limited spread to new areas in Switzerland after 20 and 50 dispersal events is predicted. Given the current limited distribution of the German tamarisk in Switzerland, conservation efforts are required to allow for the formation of new riparian habitat. Additionally, connectivity along river networks has to be enhanced to help the species to escape the extinction vortex it is trapped in." (source : auteurs) Type de publication : périodique Référence biblio : Fink S., Lanz T., Stecher R., Scheidegger C., 2017 - Colonization potential of an endangered riparian shrub species. Biodiversity and Conservation, 26 (9) : 2099–2114. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66256 [article]

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Future extinction risk of wetland plants is higher from individual patch loss than total area reduction / David C. Dean in Biological conservation, vol. 209 (Mai 2017)

Public [article]  inBiological conservation > vol. 209 (Mai 2017) . - pp. 27-33 Titre : Future extinction risk of wetland plants is higher from individual patch loss than total area reduction Type de document : texte imprimé Auteurs : David C. Dean, Auteur ; Damien A. Fordham, Auteur ; Fangliang He, Auteur ; Corey Bradshaw (Corey J.A.), Auteur Année de publication : 2017 Article en page(s) : pp. 27-33 Langues : Anglais (eng) Catégories : [habitats/milieux] ZH - Zones humides Mots-clés : perte de zone  Planification de la conservation  risque d'extinction  relation entre espèces  diversité biologique  perte d'habitat Résumé : "Quantifying the risk of extinction due to habitat loss is an increasingly urgent task for the design and implementation of effective conservation interventions. Methods based on species- and endemics-area relationships are well developed, but applications to date have concentrated primarily on the fragmentation of formerly continuous habitats such as forests and woodlands. Applying these area-based methods to predict extinction risk in habitat types occurring naturally as spatially discrete patches has been largely ignored. We address this knowledge gap using a network of seasonally connected wetlands. We modelled the risk of extinction associated with native wetland plant communities under two alternative scenarios: the loss of (i) entire wetlands (patch loss) versus (ii) an equivalent area distributed across the wetlands (area loss). Patch-loss scenarios resulted in more than twice the number of species going extinct than the equivalent loss of area. Extinction due to patch loss was highest when wetlands were removed in increasing size order (smallest to largest) – a plausible scenario arising from forecast climatic drying in the region. Small wetlands contained > 16% of endemic species in only < 5% of wetland area, largely explaining this result. Extinction risk associated with naturally occurring habitat patches depends on the distribution of regionally endemic species; where this is not solely a function of habitat area, the loss of small patches can represent higher risk than an equivalent reduction in total habitat area across the network." (source : auteurs) Type de publication : périodique Référence biblio : Dean D., Fordham D., He F., Bradshaw C., 2017 - Future extinction risk of wetland plants is higher from individual patch loss than total area reduction. Biological conservation, 209 : 27-33. ID PMB : 65411 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=65411 [article]

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The collapse of marsh fritillary (Euphydryas aurinia) populations associated with declining host plant abundance / Ane Kirstine Brunbjerg in Biological conservation, vol. 211 (Juillet 2017)

Public [article]  inBiological conservation > vol. 211 (Juillet 2017) . - pp. 117-124 Titre : The collapse of marsh fritillary (Euphydryas aurinia) populations associated with declining host plant abundance Type de document : texte imprimé Auteurs : Ane Kirstine Brunbjerg, Auteur ; Toke Thomas Høye, Auteur ; Anne Eskildsen, Auteur ; Bettina Nygaard, Auteur ; Christian Frølund Damgaard, Auteur ; Rasmus Ejrnæs, Auteur Année de publication : 2017 Article en page(s) : pp. 117-124 Langues : Anglais (eng) Catégories : [ZG] Danemark [Espèces (in biblio)] Succisa pratensis [Thèmes] Relation plante - animal Mots-clés : acidification  facteur biotique  eutrophisation  perte d'habitat Résumé : "Monophagous butterflies often have smaller ranges than their host plants, which could relate to host plant abundance. Many specialist butterflies have already gone regionally extinct and studies of the role of host plant and habitat abundance at resolutions sufficiently detailed to cover host plant abundance are urgently needed for conservation management. Here, we investigate the link between a predominantly monophagous butterfly – the critically endangered Euphydryas aurinia and its host – Succissa pratensis in Denmark using high resolution (1 × 1 km) butterfly distribution data and an extensive national host plant frequency data set. More specifically, we assessed whether patterns in the present day distribution of S. pratensis and its habitat can explain the current distribution of E. aurinia and which ecological factors determine habitat suitability for S. pratensis. We used logistic regression to model the occurrence of E. aurinia as a function of habitat and host plant abundance as well as connectivity among habitats. We also modelled the occurrence of S. pratensis from habitat type, soil type, precipitation and indicators of soil moisture, nutrient level, and pH using generalized additive models. The remaining E. aurinia populations are confined to small regions in northern Jutland and this pattern was well predicted by our model. High modelled probabilities of E. aurinia coincided with habitat abundance exceeding 6–7% of land area and host plant frequency within habitat exceeding 40% at plot scale. Habitat connectivity was not included in the most parsimonious model. S. pratensis occurrence probability increased with pH, decreased with nutrient status and showed a unimodal response to soil moisture. The geographic partitioning of pH and nutrient effects indicated host plant scarcity due to eutrophication in Eastern Denmark and acidification in Western Denmark. Our findings highlight the importance of identifying empirical thresholds for habitat and host plant abundance in future conservation of herbivorous insects while also taking host plant habitat requirements into account." (source : auteurs) Type de publication : périodique Référence biblio : Brunbjerg A., Høye T., Eskildsen A., Nygaard B., Frølund Damgaard C., Ejrnæs R., 2017 - The collapse of marsh fritillary (Euphydryas aurinia) populations associated with declining host plant abundance. Biological conservation, 211 : 117-124. ID PMB : 65424 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=65424 [article]

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