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Limited impact of microtopography on alpine plant distribution / Kryštof Chytrý in Ecography, (2024) 

Public Citation [article]  inEcography > (2024) . - e06744 Titre : Limited impact of microtopography on alpine plant distribution Type de document : Imprimé Auteurs : Kryštof Chytrý ; Norbert Helm ; Karl Hülber ; Dietmar Moser ; Johannes Wessely ; Johannes Hausharter ; Andreas Kollert ; Andreas Mayr ; Martin Rutzinger ; Manuela Winkler ; Harald Pauli ; Patrick Saccone (1976-) ; Mariana Paetzolt ; Peter Hietz ; Stefan Dullinger Année de publication : 2024 Article en page(s) : e06744 Langues : Anglais (eng) Résumé : Complex topography regulates near-surface temperature above the treeline. It may thus sustain microrefugia for alpine plants and relax the need of shifting upward when the climate warms. The effectiveness of these microrefugia rests on the premise that plant distributions in alpine landscapes are mainly controlled by fine-scale topographic variation. We tested this assumption by relating the distribution of 79 plant species and 10 community attributes across 900 1 m² plots in a landscape spanning 1677 m of elevation to 17 topographical descriptors at resolutions between 1 and 301 m. We found that the presence of most species and most community attributes were better explained by topographic variation at coarser scales (> 20 m). Fine-scale topography is more clearly reflected in moisture than in temperature requirements of species. The elevational gradient rather than topographic variation at any scale, is the single most important driver of both species distributions and the variation in community attributes in the area studied. We hypothesise that our results reveal a hitherto underestimated influence of spatial mass effects on alpine plant distributions. These effects can override environmental filtering at fine scales and will thus impede the survival of cold-adapted plants in small and fragmented refugia under climate warming. Identifiant : DOI : 10.1111/ecog.06744 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=155512 Chytrý, Kryštof, Helm, Norbert, Hülber, Karl, Moser, Dietmar, Wessely, Johannes, Hausharter, Johannes, Kollert, Andreas, Mayr, Andreas, Rutzinger, Martin, Winkler, Manuela, Pauli, Harald, Saccone, Patrick (1976-), Paetzolt, Mariana, Hietz, Peter, Dullinger, Stefan 2024 Limited impact of microtopography on alpine plant distribution. Ecography: e06744.

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Phenological Responses of Snowbed Species to Snow Removal Dates in the Central Alps: Implications for Climate Warming / Karl Huelber in Arctic, Antarctic, and Alpine Research, 38 (1) (2006) 

Public Citation [article]  inArctic, Antarctic, and Alpine Research > 38 (1) (2006) . - 99-103 Titre : Phenological Responses of Snowbed Species to Snow Removal Dates in the Central Alps: Implications for Climate Warming Type de document : Imprimé Auteurs : Karl Huelber ; Michael Gottfried ; Harald Pauli ; Karl Reiter ; Manuela Winkler ; Georg Grabherr (1946-) Année de publication : 2006 Article en page(s) : 99-103 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Changement climatique [CBNPMP-Géographique] Alpes Mots-clés : Combes à neige Résumé : Low temperatures and the short growing season in high altitude snow patches in temperate mountains constrain life cycles and reproduction of snowbed species. This leads to a highly adapted timing of sexual reproduction. Winter precipitation and temperature, the main factors determining growing season length, are predicted to change with global warming. To understand their impacts on plant phenology, we studied the responses of seven alpine vascular plant species during 2001. Temperature had a clear impact on phenological patterns. The start of the reproductive development was not directly linked with the date of snowmelt, but rather with the cumulative energy input. In addition, photoperiodism may also contribute to the control of plant development through an increasing temporal adjustment of phenology until flowering. Identifiant : DOI : 10.1657/1523-0430(2006)038[0099:PROSST]2.0.CO;2 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=155398 Huelber, Karl, Gottfried, Michael, Pauli, Harald, Reiter, Karl, Winkler, Manuela, Grabherr, Georg (1946-) 2006 Phenological Responses of Snowbed Species to Snow Removal Dates in the Central Alps: Implications for Climate Warming. Arctic, Antarctic, and Alpine Research, 38(1): 99-103.

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