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Auteur Eric S. Menges |
Documents disponibles écrits par cet auteur (4)
Affiner la rechercheAdaptive introductions: How multiple experiments and comparisons to wild populations provide insights into requirements for long-term introduction success of an endangered shrub / Eric S. Menges in Plant diversity, 38 (5) (October 2016)
Titre : Adaptive introductions: How multiple experiments and comparisons to wild populations provide insights into requirements for long-term introduction success of an endangered shrub Type de document : Imprimé Auteurs : Eric S. Menges ; Stacy A. Smith ; Carl W. Weekley Année de publication : 2016 Article en page(s) : 238-246 Langues : Anglais (eng) Mots-clés : Florida ziziphus Résumé : Recovery of an imperiled plant species may require augmentation of existing populations or creation of new ones. Hundreds of such projects have been conducted over the last few decades, but there is a bias in the literature favoring successes over failures. In this paper, we evaluate a series of introductions that experimentally manipulated microhabitat and fire in an adaptive introduction framework. Between 2002 and 2012, we (and our collaborators) carried out ten introductions and augmentations of Florida ziziphus Pseudoziziphus (Condalia, Ziziphus) celata, a clonal shrub limited to very small populations and narrowly endemic to pyrogenic central Florida sandhills. Six of the introductions were designed as experiments to test hypotheses about how demographic performance was affected by microhabitat, fire, and propagule type. Introduced transplants had high survival (<90% annually), inconsistent growth, and little transition to reproduction, while introduced seeds had low germination and survival. Transplants were more efficient than seeds as translocation propagules. Shaded (vs. open) sites supported generally higher transplant and seedling survival and seed germination percentages, but growth responses varied among experiments. Supplemental irrigation increased transplant survival and seed germination, but otherwise seedling and plant survival and growth were not significantly affected. Contrary to expectations based on wild populations, introduced propagules have not been more successful in unshaded sites, suggesting that Florida ziziphus has broader microhabitat preferences than hypothesized. Compared to wild plants, introduced plants had similar survival and responses to fire, slower growth, and more delayed flowering. Introduced plants had no clonal spread. While no introduced population has demonstrated a capacity for long-term viability, one augmented population has flowered and produced viable fruits. Given that Florida ziziphus genets are long-lived, low levels of sexual reproduction may be adequate for the establishment of viable populations. Thus, after many translocations over more than a decade, it is premature to characterize any single translocation as a success or a failure, underscoring the need for a long view of translocation success. Lien pérenne : DOI : 10.1016/j.pld.2016.09.004 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=146646
in Plant diversity > 38 (5) (October 2016) . - 238-246Menges, Eric S., Smith, Stacy A., Weekley, Carl W. 2016 Adaptive introductions: How multiple experiments and comparisons to wild populations provide insights into requirements for long-term introduction success of an endangered shrub. Plant diversity, 38(5): 238-246.Documents numériques
Consultable
Article (2016)URLEffects of seed collection on the extinction risk of perennial plants / Eric S. Menges (2004)
est un extrait de Ex situ plant conservation supporting species survival in the wild / Edward O. Guerrant (2004)
Titre : Effects of seed collection on the extinction risk of perennial plants Type de document : Extrait d'ouvrage Auteurs : Eric S. Menges ; Edward O. Guerrant ; Samara Hamzé Année de publication : 2004 Importance : p. 305-324 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Banque de semences
[CBNPMP-Thématique] Stratégie de conservation ex situ
[CBNPMP-Thématique] Extinction, régressionPermalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=84992 Menges, Eric S., Guerrant, Edward O., Hamzé, Samara 2004 Effects of seed collection on the extinction risk of perennial plants. In: Ex situ plant conservation supporting species survival in the wild. Island Press, Washington: 305-324.
Titre : Restoration demography and genetics of plants : when is a translocation successful ? Type de document : Numérique Auteurs : Eric S. Menges Année de publication : 2008 Article en page(s) : 187-196 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Conservation des ressources génétiques
[CBNPMP-Thématique] Distribution de la diversité génétique
[CBNPMP-Thématique] Génie génétique et environnement
[CBNPMP-Thématique] Restauration des écosystèmesRésumé : Restorations are complex, often involving restoring ecological processes, vegetation structure, and species’ populations. One component of restorations is translocation of key species. Translocations (introductions, reintroductions, augmentations) are often necessary to recover species diversity and install key species. In this review, I consider the ways translocations have been evaluated at various stages duringthe process of restoration. Vital rates (survival, growth, fecundity) of propagules (seeds, transplants) are commonly used to evaluate initial success. Transplants usually provide greater initial success than do sown seeds. Beyond initial rates, completion of the life cycle through flowering, fruiting, dispersal and subsequent seedling recruitment is a key benchmark. Modelling population viability of translocated populations is a logical next step and can bring in many powerful inferential tools. Of factors affecting the success of translocations, genetic issues are paramount, as restorationists need to consider inbreeding depression, reproductive viability, local adaptation, and evolutionary potential of translocated populations. The success of translocations is also clearly context-dependent, with herbivory, disturbance, competition and other ecological factors important. Future translocations need to make better use of comparisons with reference populations, a long-term perspective on success and an experimental framework that can provide both practical and basic knowledge. Demographic data collection and analysis in restorations has great potential to elucidate causes of translocation failure and improve the prognosis of future restorations. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=155172
in Australian Journal of Botany > 56 (2008) . - 187-196Menges, Eric S. 2008 Restoration demography and genetics of plants : when is a translocation successful ? Australian Journal of Botany, 56: 187-196.Documents numériques
Article (2008)URL
Titre : The application of minimum viable population theory to plants Type de document : Extrait d'ouvrage Auteurs : Eric S. Menges Année de publication : 1991 Importance : p. 45-61 Langues : Français (fre) Catégories : [CBNPMP-Thématique] Métapopulation
[CBNPMP-Thématique] Densité-seuil population
[CBNPMP-Thématique] Démographie, écologie des populations (dynamique des populations, démécologie)Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=84381 Menges, Eric S. 1991 The application of minimum viable population theory to plants. In: Genetics and conservation of rare plants. Oxford University Press, New-York: 45-61.
