Desarrollo de métodos para una gestión integrada de la polilla del boj en parques, jardines y espacios verdes
Desde la elevada afectacion por la polilla del boj (Cydalima perspectalis), una especie exotica d... more Desde la elevada afectacion por la polilla del boj (Cydalima perspectalis), una especie exotica de origen asiatico, en la ciudad de Olot (Girona) durante el 2017, se puso de manifiesto la necesidad de elaborar una gestion integrada basada en el desarrollo de este crambido. Para ello, se ha registrado su dinamica de desarrollo anual, se ha medido la eficacia de diferentes tratamientos, se ha analizado las posibilidades del control biologico existente y se ha establecido un umbral de tolerancia
SEGUIMIENTO DE LA EVOLUCIÓN DEMOGRÁFICA DEL JABALÍ (Sus scrofa) Y EFECTOS DEL INCREMENTO DE PRESIÓN CINEGÉTICA EN EL PARQUE NATURAL DE LA ZONA VOLCÁNICA DE LA GARROTXA
Monitoring the demograhpic variation of the Wild Boar (Sus scrofa) and the effects of the increas... more Monitoring the demograhpic variation of the Wild Boar (Sus scrofa) and the effects of the increase of the cinegetic pressure in the Zona Volcánica de la Garrotxa Natural Park A monitoring of the wild boar battues conducted in the Zona Volcànica de la Garrotxa Natural Park (NE Iberian) was started during the 1990/91 hunting season and has been continued untill present. This study is based on the collaboration of the hunter teams, the Park crew and specialized technicians on wildlife management. At present, data collected concern a hunting area of almost 30.000 ha, where 8 different teams are hunting. Besides compiling the cinegetic information (participants in the battues, traits of animals captured, etc.), several other activities including recording of biometrical and reprodutive
<p>Distribution of cavity diameters used by hosts for nest construction in spring (n = 719 ... more <p>Distribution of cavity diameters used by hosts for nest construction in spring (n = 719 nests) and summer (n = 768 nests). (X-squared = 272.45, df = 6, P < 0.0001).</p
The incidence of alien species to invaded host ecosystems has increased in recent years due to cl... more The incidence of alien species to invaded host ecosystems has increased in recent years due to climate change and the growth in international trade (Hulme, 2003). The movement of alien species (not native to a specific location, also referred to as introduced or non-native species) has been linked to human activity for millennia due to international trade that favors the accidental introduction of species into new ecosystems (Bradshaw et al., 2016; Hulme, 2009). The association is so strong that key moments in history involving international commerce match alien species redistribution peaks, highlighting the end of the Middle Ages, the industrial
<p>Spring (A) and summer (B) host-parasitoid network (data from 14 sites lumped together). ... more <p>Spring (A) and summer (B) host-parasitoid network (data from 14 sites lumped together). Numbers correspond to species names in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0205854#pone.0205854.s004" target="_blank">S4 Table</a>. Width of grey bands denotes interaction strength (number of cells parasitized). Width of red and yellow bars indicates host abundance (number of cells produced). Note different scales (number of cells) in spring and summer networks.</p
<p>Nonmetric multidimensional scaling (NMDS) of (A) host and (B) parasitoid community compo... more <p>Nonmetric multidimensional scaling (NMDS) of (A) host and (B) parasitoid community composition in each season and site. Dots represent seasons (blue: spring; red: summer). Numbers represent species codes (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0205854#pone.0205854.s004" target="_blank">S4 Table</a>; red: bees; orange: wasps; black: parasitoids). Polygons encompass all sites within a season. Ellipses represent 0.95% confidence intervals. Only two of the three dimensions obtained in the analyses (k = 3) are displayed.</p
LIFE Potamo Fauna (LIFE12 NAT/ES/001091), un proyecto para la recuperación y la conservación de fauna fluvial amenazada en las cuencas de los ríos Ter, Fluvià i Muga (Cataluña)
The exotic bee Megachile sculpturalis has colonized the European continent in the last decade, in... more The exotic bee Megachile sculpturalis has colonized the European continent in the last decade, including some Mediterranean countries such as France and Italy. In summer 2018 it was recorded for the first time in Spain, from several sites in Catalonia (NE Iberian Peninsula). Here we give details on these first records and provide data on its biology, particularly of nesting and floral resources, mating behaviour and interactions with other species.
Qualsevol forma de reproducció, distribució, comunicació pública o transformació d'aquesta obra n... more Qualsevol forma de reproducció, distribució, comunicació pública o transformació d'aquesta obra només es pot fer amb l'autorització dels seus titulars, llevat de l'excepció prevista a la llei.
Ecological communities are composed of species that interact with each other forming complex inte... more Ecological communities are composed of species that interact with each other forming complex interaction networks. Although interaction networks have been usually treated as static entities, interactions show high levels of temporal variation, mainly due to temporal species turnover. Changes in taxonomic composition are likely to bring about changes in functional trait composition. Because functional traits influence the likelihood that two species interact, temporal changes in functional composition and structure may ultimately affect interaction network structure. Here, we study the seasonality (spring vs. summer) in a community of cavity-nesting solitary bees and wasps ('hosts') and their nest associates ('parasitoids'). We analyze seasonal changes in taxonomic compostion and structure, as well as in functional traits, of the host and parasitoid communities. We also analyze whether these changes result in changes in percent parasitism and interaction network structure. Our host and parasitoid communities are strongly seasonal. Host species richness increases from spring to summer. This results in important seasonal changes in functional composition of the host community. The spring community (almost exclusively composed of bees) is characterized by large, univoltine, adult-wintering host species. The summer community (composed of both bees and wasps) is dominated by smaller, bivoltine, prepupa-wintering species. Host functional diversity is higher in summer than in spring. Importantly, these functional changes are not only explained by the addition of wasp species in summer. Functional changes in the parasitoid community are much less pronounced, probably due to the lower parasitoid species turnover. Despite these important taxonomic and functional changes, levels of parasitism did not change across seasons. Two network metrics (generality and interaction evenness) increased from spring to summer. These changes can be explained by the seasonal increase in species richness (and therefore network size). The seasonal shift from a bee-dominated community in spring to a wasp-dominated community in summer suggests a change in ecosystem function, with emphasis on pollination in spring to emphasis on predation in summer.
LA CONSERVACIÓ DELS VALORS NATURALS DEL FLUVIA EMILI BASSOLS EL FET DIFERENCIAL MES DESTACAT DEL ... more LA CONSERVACIÓ DELS VALORS NATURALS DEL FLUVIA EMILI BASSOLS EL FET DIFERENCIAL MES DESTACAT DEL RIU PLUVIA és que es tracta de l'únic riu no regulat de Catalunya. Al liargdels seus gairebé cent quilometres de longitud no existeíx cap gran embassament que n'intercepti el seu cabal, n'iníerfereixi la seva capacitat erosiva o en condicioni la qualitat deis seus ecosistemes riberencs. Aquesta circumstáncia és realmení prodigiosa en un país com el nostre, on la majoria de rius topen amb l'obstacle d'un gBn barratge de foimigó. La singularitat del riu Pluvia és, dones, el seu alt potencial ecológic. És cert que lii ha impactes que en limiten aquest potencial, i per tant caldrá aplicar les corresponents mesures per aconseguir la consen/ació integral i real deis seus principáis valois naturals. Característiques generáis El riu Pluvia és un íípic riu de muntanya mitjana en el qual l'aportació de cabal depén, gairebé de forma exclusiva, de les precipitacions en forma de pluja. La conca del riu Pluvia té una superi'ície aproximada de 1.123,58 km^ que representa un 19,8% de la superficie de les comarques gironines. Des del seu incert naixement a Collsacabra fins a la seva desembocadura a Sant Pere Pescador, el Pluvia recorre una longitud aproximada de 97,2 km. La seva aporíació mitjana anual d'aigüa al Mediterrani se sitúa al vol-tant deis 225 hm^ valor que, si ens limitem ais rius de les conques internes de Catalunya, tan sois és superat peí Ter ¡ peí Uobregat. Deis vint-i-un municipis de la comarca de la Garrotxa, divuit drenen les seves aigües al Pluvia. La poblado d'aquests municipis suma un total de 47.403 habitants (segons padró continu de 2004), xifra considerable si tenim en compte que la resta de municipis de la conca del Pluvia computen un total de 28.274 habitants. Aixó vol dir que el pes específic de la comarca de la Garrotxa en la gestió del Pluvia és import:ant. De les conques internes de Catalunya, la conca del Pluvia és la que té una major superficie protegida, en concret 43.569 ha, que representen el 40% de la conca. La caracteristica mes destacable del Pluvia és que és l'únic riu de Catalunya que no está represat. De totes formes, tal com es pot veure en l'ariiicie dedicat a l'aigua (Canallas i Costa, en aquest mateix dossier) el Pluvia, a la Garrotxa, supera multitud de petites rescloses que emmagatzemen un important volum d'aigua. Aixo crea un comportament similar al d'un sistema de vasos comunicants amb un flux mínim i un índex de renovado molt baix, fet que incideix en la qualitat de l'aigua, en la capacitat d'autodepuradó del riu, en el manteniment de la connexió ecológica per a determinats organismes i, també, en !a composició florística de les ribes,
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