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Landscape connectivity and insect herbivory: A framework for understanding tradeoffs among ecosystem services / Dorothy Y. Maguire in Global ecology and conservation, vol 4 (July 2015)  

Public [article]  inGlobal ecology and conservation > vol 4 (July 2015) . - pp 73 - 84 Titre : Landscape connectivity and insect herbivory: A framework for understanding tradeoffs among ecosystem services Type de document : Article/Communication Auteurs : Dorothy Y. Maguire, Auteur ; Patrick M.A. James, Auteur ; Christopher M. Buddle, Auteur ; Elena M. Bennett, Auteur Année de publication : 2015 Article en page(s) : pp 73 - 84 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] connexité (topologie) [Termes IGN] corridor biologique [Termes IGN] insecte nuisible [Termes IGN] protection de l'environnement [Termes IGN] service écosystémique [Vedettes matières IGN] Ecologie forestière Résumé : (auteur) Current theory suggests that ecosystem services in fragmented landscapes can be maintained by preserving connectivity of remaining habitat patches. However connectivity does not always influence services positively. For example, outbreaks of destructive insect herbivores can be facilitated by connectivity among forest patches. Understanding the positive and negative effects of connectivity on ecosystem processes is needed to help scientists and managers anticipate tradeoffs among services that result from forest fragmentation or restoration. In this paper we use a vote counting meta-analytic approach in combination with a literature survey to explore how connectivity affects ecosystem service provisioning using insect herbivory as a model process. Our results indicate that landscape connectivity affects herbivory in diverse ways, and that implications for services depend on whether we consider outbreaking species. Under non-outbreak conditions, herbivory positively affects services such as timber production, soil formation, and recreation by stimulating tree growth and enhancing soil productivity, but under outbreak conditions, herbivory negatively affects services by reducing timber yields and the aesthetic value of forests. We present a framework that shows herbivory is an important mechanism through which connectivity affects ecosystem services. Using case studies we demonstrate the applicability of the framework to management of two forest insect pests: the mountain pine beetle and forest tent caterpillar. Numéro de notice : A2015--046 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article DOI : 10.1016/j.gecco.2015.05.006 En ligne : http://dx.doi.org/10.1016/j.gecco.2015.05.006 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82113 [article]

Effects of micro-topographies on stand structure and tree species diversity in an old-growth evergreen broad-leaved forest, southwestern Japan / Tran Van Do in Global ecology and conservation, vol 4 (July 2015)  

Public [article]  inGlobal ecology and conservation > vol 4 (July 2015) . - pp 185 - 196 Titre : Effects of micro-topographies on stand structure and tree species diversity in an old-growth evergreen broad-leaved forest, southwestern Japan Type de document : Article/Communication Auteurs : Tran Van Do, Auteur ; Tamotsu Sato, Auteur ; Satoshi Saito, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 185 - 196 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] biodiversité végétale [Termes IGN] facteur édaphique [Termes IGN] feuillu [Termes IGN] gradient de pente [Termes IGN] Japon [Termes IGN] placette d'échantillonnage [Termes IGN] structure d'un peuplement forestier [Vedettes matières IGN] Ecologie forestière Résumé : (auteur) Stand structure and species diversity were studied in correspondence with micro-topographies in an old-growth forest in southwestern Japan. The study was conducted in a View the MathML source200×200m2 permanent plot, which were divided into 400 subplots using grids of View the MathML source10m×10m. Subplots were categorized to four micro-topographies as crest slope (CS), head hollow (HH), upper slope (US) and lower slope (LS), basing on slope of forest floor and plot position, and to two elevational zones as below 450 m and above 450 m. Tree censuses for all individuals with diameter at breast height (DBH) ⩾⩾ 5 cm were conducted in 2009 and 2013. The results indicated that CS had subplot means of living stems, dead stems, DBH, basal area (G), and basal area increment (▵▵G) significantly higher than that in LS. While, means of recruited stems and Shannon diversity index were significantly lower. Comparing between below and above 450 m elevational zones indicated the significantly higher parameters of stand structure and species diversity in above 450 m elevational zone. The differences of edaphic conditions led to difference of density of living stems, species density, DBH, G, and ▵▵G among micro-topographies. Therefore, crest slope, upper slope, and higher elevational zones should be encouraged for the purposes of carbon accumulation and storage. While, the lower elevational zones should be used for the purposes of species diversity conservation. Numéro de notice : A2015--047 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article DOI : 10.1016/j.gecco.2015.06.010 En ligne : http://dx.doi.org/10.1016/j.gecco.2015.06.010 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82114 [article]