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            "abstractNote": "/ Cette étude porte sur l'évolution des communautés d'oiseaux au cours de la succession de la futaie régulière de Chêne sessile dans deux grands massifs du Parc Naturel Régional du Perche. Les analyses portent sur plus de 373 points d'écoute (2 passages de 5 min par point) réalisés par Christian Thiébaut (ONF) en 2004 en forêt domaniale de Perche-Trappe et en 2005 en forêt domaniale de Bellême. Les résultats montrent que :\n- l'avifaune évolue fortement au cours de la succession de la futaie régulière selon un patron cyclique,\n- ce patron d'évolution est très général même si certains résultats demandent à être nuancés entre régions ou parfois même entre forêts d'une même région (par exemple, le Pouillot siffleur n'a apparemment pas les mêmes exigences en Normandie et en Bourgogne),\n- l'avifaune continue d'évoluer après 150 ans, au profit notamment d'une partie des espèces cavernicoles mais pas seulement,\n- les exigences écologiques de certaines espèces demeurent assez floues,\n- la réaction de l'avifaune semble proche de celle des carabiques, dont beaucoup sont également prédateurs mais diffère de celle de la flore, en ceci que la richesse des plantes vasculaires décroît progressivement au cours du cycle.\nCette étude a cependant des limites communes avec celle de Ferry et Frochot (1970):\n- ces deux études ont été réalisées dans des grands massifs, il n'est pas certain que l'on retrouve exactement les mêmes résultats dans des massifs moins étendus, plus fragmentés où tous les stades ne seront pas nécessairement présents simultanément,\n- l'agencement parcellaire n'a pas été pris en compte. Dans notre cas, plusieurs résultats s'expliquent probablement par l'agencement parcellaire (cas du Pic cendré, de la Grive draine, de la Mésange à longue queue),\n- les effets de lisière (distance au chemin le plus proche, distance à la bordure du massif) n'ont pas été pris en compte non plus (alors qu'il s'agit probablement un élément important pour les espèces se nourrissant préférentiellement dans les espaces ouverts intra-forestiers (Sylviidés par exemple) ou agricoles (Columbidés ou Fringillidés par exemple).\nCette étude plaide donc pour le maintien de cycles longs. En effet, on constate l'augmentation de fréquence d'un nombre conséquent d'espèces au-delà de 150 ans alors même que les peuplements sont encore sains. Par ailleurs, il est probable que la sénescence d'une partie du peuplement (par exemple si le bois était récolté au-delà de 200 ans) se traduira par une augmentation encore plus marquée de la fréquence de ces espèces des vieux peuplements.\nCette étude milite également en faveur d'une structure équilibrée des classes d'âge dans ces grands massifs qui permette aux populations de trouver en permanence des habitats favorables en quantité suffisante. Ce point cependant devra être approfondi par une réelle analyse spatiale, étendue à d'autres massifs plus ou moins grands et de structures en classes d'âge variées.",
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            "date": "2005",
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                    "tag": "Animaux cavernicoles",
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                },
                {
                    "tag": "Animaux prédateurs",
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                    "tag": "Cadeaux",
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                    "tag": "Carabidés",
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            "abstractNote": "/ L'empreinte du forestier la plus importante sur les peuplements est probablement la sélection qu'il opère sur les essences en début et au cours du cycle sylvicole, qu'elles soient essences objectif et/ou d'accompagnement. La structure d'un peuplement forestier évolue avec son âge et la gestion qui peut favoriser ou limiter la stratification des peuplements. Les analyses des relevés de Christian Thiébaut dans les massifs de Perche-Trappe et de Bellême confortent les hypothèses de travail en partie seulement.\nLes feuillus hébergent une plus forte richesse totale et en espèces cavernicoles que les résineux uniquement lorsque la hauteur dominante du peuplement excède 20 m, mais la richesse des pics et des espèces migratrices n'est pas différente entre les peuplements feuillus et résineux de même hauteur, de même que la richesse totale pour les peuplements dont la hauteur est inférieure à 20 m. Au niveau spécifique, pratiquement la moitié des espèces n'ont pas de préférence manifeste pour le Chêne ou les résineux (45%), mais plus d'espèces préfèrent les feuillus que les résineux (32.5% contre 22.5%). L'évolution de la fréquence d'occurrence au cours du cycle sylvicole d'un certain nombre d'espèces diffère sensiblement entre peuplements feuillus et résineux, ce qui traduit des interactions complexes entre essence dominante et stade sylvicole. La richesse gamma ne diffère pas entre feuillus et résineux et si l'on considère les différentes essences résineuses séparément, on constate même que les peuplements de Pin sylvestre et de Douglas ont une richesse gamma supérieure à celle de Chêne d'âge comparable. Il convient de garder en tête que nous avons travaillé dans un contexte où les feuillus étaient largement majoritaires, ce qui a pu jouer en faveur plutôt des peuplements résineux. On ne trouve aucune relation entre le nombre d'essences et la richesse moyenne (totale, cavernicole, pics, migrateurs) pour les peuplements matures feuillus ou résineux. Il faut garder en tête (1) que les deux massifs étudiés se prêtent assez mal à cette analyse (le seul mélange d'essence intra-parcellaire assez bien représenté est feuillu-feuillu Chêne-Hêtre avec des taux de mélange assez modestes), et (2) qu'il semble peu probable que des arbres isolés (surtout feuillus dans un peuplement de feuillus ou de résineux dans un peuplement résineux) aient une forte importance pour des espèces dont le territoire dépasse souvent l'ha.\nLa réponse des communautés d'oiseaux à la stratification est équivoque, elle varie sensiblement selon les groupes d'espèces considérés (ce qui n'est pas surprenant), mais également selon l'âge des peuplements sans que ne se dégage une logique parmi les résultats trouvés. A l'échelle spécifique, il semble que l'avifaune réagisse plus à la présence d'une strate haute (7 espèces sur 37 ont une fréquence significativement différente dans les peuplements avec ou sans strate haute) qu'à celle d'une strate basse (3 espèces sur 37). Il n'est pas exclu que l'absence d'effet net de la stratification des peuplements de Chêne s'explique par l'identité des plantes et essences constituant le sous-étage : la Fougère aigle et le Hêtre sont les deux espèces majoritaires dans les relevés avec un sous-étage herbacé ou arbustive marqué. Or ces deux espèces ne sont pas considérées comme très favorables à l'avifaune.",
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