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Auteur Petillon, Julien
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Can urban consolidation limit local biodiversity erosion? Responses from carabid beetle and spider assemblages in Western France
article dans des revues - 2014
Varet, Marion, et al.
Titre Can urban consolidation limit local biodiversity erosion? Responses from carabid beetle and spider assemblages in Western France Type d'Ã©tude article dans des revues Auteurs personnes Varet, Marion Auteur Burel, FranÃ§oise Auteur Petillon, Julien Auteur Date de publication 2014 Editeur(s) [S.l.] : Springer Urban Ecosystems, ISSN 1083-8155 RÃ©sumÃ© During the last decades, urban consolidation has been developed to minimize spatial expansion of cities, yet very few studies investigated whether it would actually reduce some negative effects of urbanization on biodiversity. In this study, we compared the invertebrate assemblages associated with two distinct urban forms (compact vs. conventional), focusing on two arthropod taxa often used as bioindicators, and dominant in urban habitats: spiders and carabid beetles. The following parameters were estimated: assemblage composition, species richness, activity-density total, per species (excluding seldom-recorded species) and per size class. The field collection was performed in 2009 using pitfall traps randomly set in hedgerows within 6 sites (representing 251 traps). A total of 4,413 spiders belonging to 117 species and 2,077 adult carabid beetles belonging to 39 species were collected. We found few significant differences in carabid beetle and spider assemblages between the two urban forms. The species richness of both groups was independent from the neighborhood design. Only four species of carabid beetles and ten of spiders significantly reacted to the neighborhood design, and no difference was found among the two designs for all other species. Large carabid beetles were more abundant and small spiders less abundant in the new neighborhood design compared to the conventional one. For both carabid beetles and spiders, no difference in assemblage composition was found between neighborhood designs. We therefore conclude that urban consolidation, by permitting a higher human density with similar arthropod assemblages, could contribute to reduce biodiversity loss in cities. CatÃ©gories thÃ©matiques expansion urbaine anarchiqueorganisme du solinvertÃ©brÃ©densitÃ© de l'habitat Mots-clÃ©s libres City compaction/Araneae/Carabidae/Housing density/Arthropods/densitÃ© de logement/arthropode/araignÃ©e/scarabÃ©e/BiodiversitÃ© et gestion des territoires EA 7316 Echelle de territoire rÃ©gion (ou supra) Note Dans "Urban Ecosystems" (ISSN: 1083-8155) Ã©ditÃ© par Springer Verlag en 2014 vol 17, nÂ°1, pp.123-137.
Notice = https://tel.archives-ouvertes.fr/ECOBIO-PAYS/hal-00999573v1
Article = https://hal.archives-ouvertes.fr/hal-00999573/PDF/Can_urban_consolidation_limit_local_biodiversity_erosion_accepted.pdf
Langue(s) Anglais Format 29p Document en ligne https://hal.archives-ouvertes.fr/hal-00999573/PDF/Can_urban_consolidation_limit_local_biodiversity_erosion_accepted.pdf NÂ° d'Ã©dition (ISBN, DOI,...) 10.1007/s11252-013-0307-2 Permalink http://etudes.bretagne-environnement.org/index.php?lvl=notice_display&id=149739Phenological and meteorological determinants of spider ballooning in an agricultural landscape
article dans des revues - 2016-09
Simonneau, Manon, et al.
Titre Phenological and meteorological determinants of spider ballooning in an agricultural landscape Titre traduit DÃ©terminants phÃ©nologiques et mÃ©tÃ©orologiques du ballooning chez les araignÃ©es en contexte agro-Ã©cosystÃ©mique Type d'Ã©tude article dans des revues Auteurs personnes Simonneau Manon Auteur Courtial Cyril Auteur Petillon, Julien Auteur Date de publication 2016-09 Editeur(s) [S.l.] : Elsevier Comptes Rendus Biologies, ISSN 1631-0691 vol339 nÂ°9-10 RÃ©sumÃ© Spiders are known to commonly use aerial dispersal, so-called ballooning, especially at juvenile stages. They produce a silk thread that allows them to rise up in the air to disperse, which serves as inbreeding avoidance or to find an optimal over-winter habitat. Studies of phenology, species and meteorological factors associated with aerial dispersal have been limited to laboratory settings, with few data obtained under natural settings and no studies to date executed in France. To understand aerial dispersal, we conducted daily sampling between 2000 and 2002 at a height of 12 m. For adults, high proportions of âballoonersâ were observed during four seasonal peaks, with dispersal most prevalent during summer, while for juveniles dispersal was protracted across summer and fall. Linyphiidae is the most abundant family among the 10,879 individuals caught. We show a significant and negative influence of high wind speeds on ballooning, an effect that increased even under low temperatures (< 19 Â°C). At wind speeds greater than 4 mÂ·sâ1 dispersal becomes difficult, and is almost impossible beyond 5.5 mÂ·sâ1. Ballooning ability is reported for the first time for several species. This study increases our knowledge on aerial dispersal in spiders in an agricultural context. Such behaviour can be seen as a survival strategy to escape from a disturbed and unstable landscape.
Â© extrait de l'article =
"[...] A Rothamsted Insect Survey suction trap was employed to study spider dispersal in Brittany, western France (48Â°6â²44.82â³N 1Â°46â²51.16â³O) in an agricultural landscape consisting of crops, hedgerows, woody areas and human infrastructures (e.g., buildings, roads). [...]"
CatÃ©gories thÃ©matiques BIOSPHERE (organismes vivants, Ã©cosystÃ¨mes)organisme du soltempÃ©raturearaignÃ©e Mots-clÃ©s libres Aerial dispersal/Araneae/AraneaeÃ©s/Dispersion aÃ©rienne/PhÃ©nologie/Phenology/Vitesse du vent/Wind speed Echelle de territoire rÃ©gion (ou supra) Note DOI = 10.1016/j.crvi.2016.06.007 Langue(s) Anglais Format 408-416 Document en ligne http://www.sciencedirect.com/science/article/pii/S1631069116300919 Localisation du document article au format HTML disponible en ligne = http://www.sciencedirect.com/science/article/pii/S1631069116300919 NÂ° d'Ã©dition (ISBN, DOI,...) 10.1016/j.crvi.2016.06.007 Permalink http://etudes.bretagne-environnement.org/index.php?lvl=notice_display&id=158133