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Focal plant species and soil factors in Mediterranean coastal dunes: An undisclosed liaison? / Claudia Angiolini in Estuarine, Coastal and Shelf Science, vol 211 (31 October 2018)  

Public [article]  inEstuarine, Coastal and Shelf Science > vol 211 (31 October 2018) . - pp 248 - 258 Titre : Focal plant species and soil factors in Mediterranean coastal dunes: An undisclosed liaison? Type de document : Article/Communication Auteurs : Claudia Angiolini, Auteur ; Gianmaria Bonari, Auteur ; Marco Landi, Auteur Année de publication : 2018 Article en page(s) : pp 248 - 258 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] analyse canonique [Termes IGN] dune [Termes IGN] facteur édaphique [Termes IGN] indicateur biologique [Termes IGN] littoral méditerranéen [Termes IGN] microhabitat [Termes IGN] pédologie locale [Termes IGN] placette d'échantillonnage [Termes IGN] Toscane (Italie) [Vedettes matières IGN] Ecologie forestière Résumé : (auteur) Understanding the response of plant species to soil factors on coastal sand dunes is critical for effective conservation of coastal habitats in the Mediterranean basin. Our main objectives were to investigate: i) the main soil factors driving species composition in a Mediterranean coastal dune environment; ii) the ecological requirements of focal plant species with respect to single soil factors; iii) whether the focal species of a given macrohabitat (including EU habitats) have similar edaphic needs. We identified 108 plots with three macrohabitats as strata (embryo dunes; mobile dunes; fixed dunes) by random stratified sampling design along the Tyrrhenian coast of central Italy in areas with a high degree of biodiversity and naturalness. Vegetation and soil data were collected in the plots. Canonical Correspondence Analysis (CCA) confirmed that soil had a main role in driving focal dune species composition as found in other Mediterranean areas and indicated that three factors (field capacity, pH and CaCO3) sufficiently explain patterns of plant species. An inverse relation between field capacity, which proves to be the most decisive feature for differences in species ecological requirements between macrohabitats, and pH was observed. Generalized Additive Models (GAMs) showed that: i) the focal species of fixed dunes have a higher probability of occurrence and response curves that overlap at high field capacity and TOC values and at low pH, showing an opposite trend with respect to the species of embryonic and mixed dunes; ii) species of mixed dunes have a probability of occurrence linked to different values of CaCO3, with Ammophila arenaria showing its optimum at high CaCO3 values. Thus our results sustain the hypothesis that dune focal species, diagnostic and characteristic of coastal dune marcohabitats, have different ecological responses with respect to soil factors. Moreover, species within the same habitat can have different ecological responses due to species competition. Data about edaphic requirements of sand dune species and modelling of their ecological responses suggests that focal dune species can be bio-indicators of soil conditions and provide useful indications for conservation, monitoring and restoration of Mediterranean coastal habitats. Numéro de notice : A2017-249 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article DOI : 10.1016/j.ecss.2017.06.001 Date de publication en ligne : 08/06/2017 En ligne : https://doi.org/10.1016/j.ecss.2017.06.001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85209 [article]

Habitat connectivity affects specialist species richness more than generalists in veteran trees / Anne Sverdrup-Thygeson in Forest ecology and management, vol 403 (1 November 2017)  

Public [article]  inForest ecology and management > vol 403 (1 November 2017) . - pp 96 - 102 Titre : Habitat connectivity affects specialist species richness more than generalists in veteran trees Type de document : Article/Communication Auteurs : Anne Sverdrup-Thygeson, Auteur ; Olav Skarpaas, Auteur ; Stefan Blumentrath, Auteur ; et al., Auteur Année de publication : 2017 Article en page(s) : pp 96 - 102 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] biodiversité [Termes IGN] Coleoptera (ordre) [Termes IGN] connexité (topologie) [Termes IGN] Insecta [Termes IGN] microhabitat [Termes IGN] Norvège [Termes IGN] Quercus (genre) [Vedettes matières IGN] Ecologie forestière Résumé : (auteur) Intensified human land use continues to increase habitat loss and fragmentation, and leads to a homogenization of biodiversity. Specialized species with narrow niches seem to be declining more rapidly than generalist species. Veteran trees offer an excellent model system for testing the responses of habitat specialists vs. generalists in a changing environment, as they host a rich fauna of associated insects, with different degrees of strict habitat affinity. In this study, we use an extensive dataset of more than 22 000 wood-living beetles collected from 62 veteran oaks across Southern Norway, combined with a full-cover map predicting the occurrence of similar oaks in the surrounding landscape. We calculate three different connectivity measures, at eight different scales up to 25 km radius, and compare the response to patch size and patch connectivity for the specialist beetles in the veteran oak community, with that of the remaining beetle species in the community. We investigate these responses in oaks in two different surroundings; forests and parks. Our overall aim is to test whether habitat specialists and generalists respond differently to habitat patch connectivity, and if so, if differences in species traits or close surroundings can explain the response. We found that the specialists showed a positive response to habitat amount on a small scale (0.5 km), and this effect of small-scale connectivity was the only common factor explaining a high species richness of specialists in all models, independent of park or forest surroundings. For generalists, there was no or only a weak response to connectivity, and only at the largest scale (25 km) tested. The differences in response to habitat connectivity between specialists and generalists in veteran oaks can partly be explained by differences in traits, as the specialists were found to have larger body sizes, and feed on larger and more decayed dead wood material. These are all traits that have been related to increased sensitivity to forest fragmentation in earlier studies. The size and vitality of the oak, as well as the openness around it, also influenced the species richness, with different patterns between specialists and generalists and between the two types of oak surroundings. We conclude that increasing biotic homogenization is likely to take place with further fragmentation and loss of veteran trees, and specialist species will be the major group affected. Numéro de notice : A2017-614 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article DOI : 10.1016/j.foreco.2017.08.003 En ligne : https://doi.org/10.1016/j.foreco.2017.08.003 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=86924 [article]

Effects of environmental factors on the species richness, composition and community horizontal structure of vascular plants in Scots pine forests on fixed sand dunes / Mari Tilk in Silva fennica, vol 51 n° 3 (2017)  

Public [article]  inSilva fennica > vol 51 n° 3 (2017) Titre : Effects of environmental factors on the species richness, composition and community horizontal structure of vascular plants in Scots pine forests on fixed sand dunes Type de document : Article/Communication Auteurs : Mari Tilk, Auteur ; Tea Tullus, Auteur ; Katri Ots, Auteur Année de publication : 2017 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] biodiversité [Termes IGN] dune [Termes IGN] Estonie [Termes IGN] facteur édaphique [Termes IGN] microhabitat [Termes IGN] Pinus sylvestris [Vedettes matières IGN] Ecologie forestière Résumé : (auteur) Different environmental factors were studied to determine which factors influence the species richness, composition and structure of vascular plants in Pinus sylvestris L. forests in a fixed dune landscape in south-western Estonia. In addition to site topographic factors, different environmental parameters were investigated. Thirty-four vascular plant species were recorded in 232 quadrats. The most abundant species was Vaccinium vitis-idaea L., which was in 82.8% of quadrats, followed by Vaccinium myrtillus L. (74.1%), Melampyrum pratense L. (71.1%) and Deschampsia flexuosa (L.) Trin. (69.8%). The multiple response permutation procedure (MRPP) showed considerable differences in species composition at the bottoms of dunes compared with that on the slopes and at the tops of dunes. Indicator species analysis (ISA) determined species exhibited characteristics specific to zone: V. myrtillus had the highest indicator value at the bottoms of dunes; Calluna vulgaris L., at the tops. Soils were Haplic Podzols, and the presence of humus horizon depended on zone. Soil conditions on the dunes were variable and site specific, in general, soils at the bottoms of the dunes were more acidic and moist compared with those of the slopes and tops of the dunes, and the nutrient content decreased toward the dune tops. According to non-metric multidimensional scaling (NMDS) and linear mixed model analyses, species coverage, composition and richness were controlled by site-specific factors such as absolute height, location and aspect of the quadrat on the dune; soil nitrogen, potassium and phosphorus contents; soil pH and moisture; light conditions; and the thickness of the litter horizon. Numéro de notice : A2017-647 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.14214/sf.6986 En ligne : https://doi.org/10.14214/sf.6986 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=87005 [article]

Land ownership affects diversity and abundance of tree microhabitats in deciduous temperate forests / Franz Johann in Forest ecology and management, vol 380 (15 november 2016)  

Public [article]  inForest ecology and management > vol 380 (15 november 2016) . - pp 70 - 81 Titre : Land ownership affects diversity and abundance of tree microhabitats in deciduous temperate forests Type de document : Article/Communication Auteurs : Franz Johann, Auteur ; Harald Schaich, Auteur Année de publication : 2016 Article en page(s) : pp 70 - 81 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] feuillu [Termes IGN] forêt privée [Termes IGN] forêt tempérée [Termes IGN] habitat forestier [Termes IGN] microhabitat [Termes IGN] propriété foncière [Vedettes matières IGN] Ecologie forestière Résumé : (auteur) Tree microhabitats – e.g. cavities, bark pockets or crown dead wood – have been described as key habitat elements, which are particularly important for birds, bats and xylobiont insects. They are therefore vital for promoting biodiversity in forest ecosystems. The occurrence of such tree microhabitats in forest stands is closely related to forest management. In Central European cultural landscapes, forest areas are subdivided into a mosaic of stands under different ownership types and owners vary in their forest management strategies and practices. However, little is known about the influence of forest ownership on the density and diversity of tree microhabitats in forest stands. In this study, we investigate tree microhabitats – categorised into 31 different tree microhabitat types – within forest stands in clusters of different ownership types. We compare small-scale private forests, municipal forests and state-owned forests in deciduous temperate forest ecosystems in south-western Germany. Our results reveal that the density of tree microhabitats per hectare is more than twice as high in small-scale private forests than in municipal or state-owned forests. Similarly, the diversity of tree microhabitats related to area is highest in small-scale private forests. Moreover, we found differences in tree microhabitat occurrences under the three ownership types at the single tree level. Besides ownership type, relevant indicators for tree microhabitats are basal area of forest stands as well as tree vitality and diameter. Within the study region, the share of tree microhabitats provided by small-scale private forests plays a substantive role for overall forest biodiversity. Management of publicly owned forests should promote a higher density and diversity of tree microhabitats to comply with goals of close-to-nature forest management approaches. In conclusion, we regard the type of forest ownership as a relevant driver of tree microhabitat occurrence. Ownership should therefore be considered in the design of policy frameworks and instruments which address the promotion of forest biodiversity. Numéro de notice : A2016-702 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article DOI : 10.1016/j.foreco.2016.08.037 En ligne : http://dx.doi.org/10.1016/j.foreco.2016.08.037 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82065 [article]

Combined effects of area, connectivity, history and structural heterogeneity of woodlands on the species richness of hoverflies (Diptera: Syrphidae) / Pierre-Alexis Herrault in Landscape ecology, vol 31 n° 4 (May 2016)  

Public [article]  inLandscape ecology > vol 31 n° 4 (May 2016) . - pp 877 - 893 Titre : Combined effects of area, connectivity, history and structural heterogeneity of woodlands on the species richness of hoverflies (Diptera: Syrphidae) Type de document : Article/Communication Auteurs : Pierre-Alexis Herrault, Auteur ; Laurent Larrieu, Auteur ; S. Cordier, Auteur ; U. Gimmi, Auteur ; Thibault Lachat, Auteur ; Annie Ouin, Auteur ; Jean-Pierre Sarthou, Auteur ; David Sheeren , Auteur Année de publication : 2016 Article en page(s) : pp 877 - 893 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] analyse spatio-temporelle [Termes IGN] connexité (topologie) [Termes IGN] hétérogénéité spatiale [Termes IGN] ilot boisé [Termes IGN] indicateur biologique [Termes IGN] microhabitat [Termes IGN] syrphidae [Vedettes matières IGN] Ecologie forestière Résumé : (auteur) Context : Hoverflies are often used as bio-indicators for ecosystem conservation, but only few studies have actually investigated the key factors explaining their richness in woodlands. Objectives : In a fragmented landscape in southwest France, we investigated the joint effects of woodland area, structural heterogeneity, connectivity and history on the species richness of forest-specialist hoverflies, and whether there was a time lag in the response of hoverflies to habitat changes, and tested the effect of spatiotemporal changes. Methods : Current species richness was sampled in 48 woodlands using 99 Malaise traps. Structural variables were derived from a rapid habitat assessment protocol. Old maps and aerial photographs were used to extract past and present spatial patterns of the woodlands since 1850. Relationships between species richness and explanatory variables were explored using generalized linear models. Results : We show that current habitat area, connectivity, historical continuity and the average density of tree-microhabitats explained 35 % of variation in species richness. Species richness was affected differently by changes in patch area between 1979 and 2010, depending on woodland connectivity. In isolated woodlands, extinction debt and colonization credit were revealed, showing that even several decades are not sufficient for hoverflies to adapt to landscape-scale habitat conditions. Conclusions : These findings emphasise the importance of maintaining connectedness between woodlands, which facilitates the dispersion in a changing landscape. Our results also highlight the benefits of using a change-oriented approach to explain the current distribution patterns of species, especially when several spatial processes act jointly. Numéro de notice : A2016-359 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article DOI : 10.1007/s10980-015-0304-3 En ligne : https://doi.org/10.1007/s10980-015-0304-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81093 [article]

Exploring life forms for linking orthopteran assemblage and grassland plant community / Rocco Labadessa in Hacquetia, vol 14 n° 1 (June 2015)  

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Comparison of tree microhabitat abundance and diversity in the edges and interior of small temperate woodlands / Annie Ouin in Forest ecology and management, vol 340 (March 2015)  

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Deadwood and tree microhabitat dynamics in unharvested temperate mountain mixed forests: A life-cycle approach to biodiversity monitoring / Laurent Larrieu in Forest ecology and management, vol 334 ([15/12/2014])  

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Les approches intégratives en tant qu‘opportunités de conservation de la biodiversité forestière / Daniel Kraus (2013) 

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Forêts anciennes de Méditerranée et des montagnes limitrophes / Magali Rossi (2013)  

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