lundi 25 novembre 2024

"Nightlife au mont Pinacle" d'Éliane Excoffier

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dimanche 17 novembre 2024

Limited impact of soil inocula from arbuscular and ectomycorrhizal-dominated sites on root morphology and growth of four tree seedling species from a temperate deciduous forest

Limited impact of soil inocula from arbuscular and ectomycorrhizal-dominated sites on root morphology and growth of four tree seedling species from a temperate deciduous forest
Vlad Parasquive, Jacques Brisson, Etienne Laliberté, Pierre-Luc Chagnon - Plant Soil - 29 October 2024
We inoculated seedlings of ectomycorrhizal (ECM) and arbuscular mycorrhizal (AM) tree species with soils from ECM-dominated forests or AM-dominated open fields ... However, only Acer grew better and invested less in autonomous root-based foraging, when inoculated with AM-dominated soils ... Both AM species (Acer rubrum L. and Ulmus americana L.) had higher AM colonization rates when inoculated with AM-dominated open field soils. However, only Acer grew better and invested less in autonomous root-based foraging, when inoculated with AM-dominated soils. Responses of ECM species to soil inocula were more nuanced. Both species remained unresponsive to inoculation treatment. Populus tremuloides Michx. ECM colonization was higher when inoculated with ECM-dominated soils, while neither root morphology nor mycorrhizal colonization responded to inoculum origin for Quercus rubra L.
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samedi 16 novembre 2024

Mycorrhizal dominance reduces local tree species diversity

Alexis Carteron, Mark Vellend & Etienne Laliberté - Nature Ecology & Evolution - 24 February 2022
... we analyse approximately 82,000 forest plots across the USA to show that both ectomycorrhizal-dominated and arbuscular mycorrhizal-dominated forests show relatively low tree diversity, while forests with a mixture of mycorrhizal strategies support a higher number of tree species. Our findings suggest that mycorrhizal dominance, rather than mycorrhizal type, shapes tree diversity in forests.
Link: Preprint

Shan Luo et al  - New Phytologist - 10 June 2024
... we tested tree species richness–community productivity relationships and the role of arbuscular (AM) or ectomycorrhizal (ECM) fungal-associated tree species in these relationships. Tree species richness had a positive effect on community productivity across experiments, modified by the diversity of tree mycorrhizal associations. In communities with both AM and ECM trees, species richness showed positive effects on community productivity, which could have resulted from complementarity between AM and ECM trees. Moreover, both AM and ECM trees were more productive in mixed communities with both AM and ECM trees than in communities assembled by their own mycorrhizal type of trees. 
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Interplay of biotic and abiotic factors shapes tree seedling growth and root-associated microbial communities

Joey Chamard, Maria Faticov, F. Guillaume Blanchet, Pierre-Luc Chagnon & Isabelle Laforest-Lapointe - Communications Biology volume 7, Article number: 360 -  22 March 2024
... we use root microscopy, coupled with amplicon sequencing, to study bacterial, fungal, and mycorrhizal root-associated microbial communities from sugar maple seedlings distributed across two temperate-to-boreal elevational gradients in southern Québec, Canada. Our findings demonstrate that soil pH, soil Ca, and distance to sugar maple trees are key drivers of root-associated microbial communities, overshadowing the influence of elevation. Interestingly, changes in root fungal community composition mediate an indirect effect of soil pH on seedling growth, a pattern consistent at both sites. Overall, our findings highlight a complex role of biotic and abiotic factors in shaping tree-microbe interactions, which are in turn correlated with seedling growth. These findings have important ramifications for tree range expansion in response to shifting climatic niches.
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Mycorrhizal communities: Quebec

Joey Chamard, Maria Faticov, F. Guillaume Blanchet, Pierre-Luc Chagnon & Isabelle Laforest-Lapointe - Communications Biology volume 7, Article number: 360 -  22 March 2024
... we use root microscopy, coupled with amplicon sequencing, to study bacterial, fungal, and mycorrhizal root-associated microbial communities from sugar maple seedlings distributed across two temperate-to-boreal elevational gradients in southern Québec, Canada. Our findings demonstrate that soil pH, soil Ca, and distance to sugar maple trees are key drivers of root-associated microbial communities, overshadowing the influence of elevation. Interestingly, changes in root fungal community composition mediate an indirect effect of soil pH on seedling growth, a pattern consistent at both sites. Overall, our findings highlight a complex role of biotic and abiotic factors in shaping tree-microbe interactions, which are in turn correlated with seedling growth. These findings have important ramifications for tree range expansion in response to shifting climatic niches.
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vendredi 15 novembre 2024

Activités de la fiducie foncière du mont Pinacle

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Activités de la Fiducie fonciere du Mont-Pinacle Land Trust Activities
 http://www.montpinacle.ca/activites/
 La Fiducie est fière d’offrir des activités éducatives susceptibles d’intéresser jeunes et moins jeunes. SVP inscrivez vous au liens si dessous./The Land Trust is proud to offer educational activities that will interest the young and not-so-young. Please register at the links below.
  • Activités extérieures gratuites sur nos sentiers/ Free outdoor activities: on our trails
  • « Soirée des possibles » offre des projections mensuelles de films chez/"Evenings of possibilities" monthly films at:   Beat et Bettrave
A venir/Upcoming
Projection du film "Vivant parmi les vivants"
Beat & Betterave 41 Rue Principale Frelighsburg - jeu. 12 déc. 2024 19:00 - 21:00 EST
Lien/Link: FFMP(Facebook)Sylvère Petit (Facebook, Web)

Isabelle Grégoire - Sentiers d'interprétation de la Fiducie foncière du mont Pinacle - sam. 11 janv. 2025 10:00 - 12:00 et  
Vous voulez apprendre à décoder les indices du passage et des déplacements des animaux de nos bois? Venez découvrir le minutieux travail de détective dans l’univers des empreintes, traces et signes de la forêt en hiver. Venez seul, entre amis ou en famille suivre les traces sur les féériques sentiers enneigés de la Fiducie foncière du mont Pinacle. Vous aurez besoin de raquettes, vêtements chauds d’hiver, eau et collation pour cette randonnée de 2 heures. Au plaisir de pister avec vous. 

Isabelle Grégoire - Sentiers d'interprétation de la Fiducie foncière du mont Pinacle - sam. 15 févr 2025 10:00 - 12:00 e

Beat & Betterave 41 Rue Principale Frelighsburg - jeu. 13 mars 2025 19:00 - 21:00 EST

Beat & Betterave 41 Rue Principale Frelighsburg - jeu. 13 mars 2025 19:00 - 21:00 EST

Vieux/Old
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Brome-Missisquoi dévoile sa stratégie pour 2024-2034

Claude Hébert - Le Guide de Cowansville - 14 novembre 2024
Le plan stratégique de développement 2024-2034 de Brome-Missisquoi, entériné par le conseil des maires le 22 octobre dernier et rendu public deux semaines plus tard, vient définir les objectifs et les moyens qui seront mis en œuvre pour garantir un avenir durable aux générations actuelles et futures.

Huit enjeux prioritaires
  1. Conservation des milieux naturels et des paysages dans un contexte de changements climatiques
  2. Disponibilité des ressources en eau et en énergie
  3. Pénurie de logements, y compris les unités abordables
  4. Pression sur les services publics (éducation, santé, services sociaux, etc.)
  5. Alternatives à l’automobile (auto-partage, transport en commun, etc.) pour se déplacer
  6. Maximisation des retombées économiques sur tout le territoire
  7. Adéquation entre la main-d’œuvre et les besoins des entreprises
  8. Capacité des municipalités à répondre à la demande avec des ressources limitées
Jérôme Savary - La Voix de l'Est - 5 novembre 2024
La communauté de Brome-Missisquoi tient à encadrer de façon durable le développement de son territoire jusqu'en 2034.

MRC - Brome-Missisquoi - Novembre 2024
La MRC à mis à jour de son plan stratégique de développement durable 2017-2032 et a officiellement déposé son plan 2024-2034.
Read more »
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vendredi 1 novembre 2024

Préserver la salamandre pourpre en zone Bécancour/The race is on to save Quebec's elusive, rare spring salamander

The race is on to save Quebec's elusive, rare spring salamander
Isaac Olson - CBC News - Sep 16, 2024
"It's hours and hours of flipping rocks and then finally we find one. There's always that joy," said Laura Molina as she searched a cold creek near Saint-Ferdinand, Que., about 200 kilometres east of Montreal  ...  The colourful species can grow up to 23 centimetres long. It's one of the largest salamanders without lungs or gills. It breathes through its skin, and can live up to 10 years. ...  Under provincial and federal law, the spring salamander is considered vulnerable and endangered ... They are so rare, the province doesn't even know how many live in Quebec...  finding one takes persistence, knowing where to look and the perfect temperature ...  By 2031, Quebec plans to further study the species, protect its habitat and identify what it needs to thrive. Finally, a communication strategy must be developed and implemented to ensure, among other things, the success of sound agricultural and forestry practices, the recovery plan says.
Rowan Kennedey - CBC News - Sep 16, 2024
A conservation group in Quebec is trying to save the spring salamander by counting them and learning how they live. The province says it also has a plan to help this endangered species.

Courrier Frontenac - 1 septembre 2024
Le Groupe de concertation des bassins versants de la zone Bécancour (GROBEC) s’intéresse à la préservation de la salamandre pourpre, une espèce vulnérable au Québec ... La salamandre pourpre (Gyrinophilus porphyriticus) est la plus grande des espèces de salamandre dites de ruisseaux. D’une couleur pourpre, elle fréquente les ruisseaux des Appalaches à la recherche d’eau claire, fraîche et bien oxygénée, sans contaminants ou sédiments ... plusieurs menaces pèsent sur la salamandre pourpre et ses habitats. « Les plans de rétablissement de l’espèce mentionnent entre autres le développement résidentiel et commercial, l’agriculture et l’aquaculture, la production d’énergie, les corridors de transports, l’exploitation forestière et la modification des systèmes naturels, pour ne nommer que celles-ci », déclare Daphné Manseau, chargée de projets Biodiversité au GROBEC.
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