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Jacinto planta reproduccion asexual de las plantas

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Dibuix de la coberta: Animal Biodiversity and Conservation Durant aquest temps hem publicat articles i hem estat citats 1. Tres societats han acceptat ja aquest repte: One of the aims of this change was to obtain an impact factor, the index that characterises the international ranking of journals. This milestone was reached some years later, inhaving published articles that have been cited in impact journals 1, times.

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Two of these papers have been cited more than times. We are now ready to take the next step forward. Our new challenge is to increase our impact factor so that Animal Biodiversity and Conservation is comparable with prestigious international journals in the field.

To meet this objective we have assembled a team of editors with international recognition, and we will continue to expand this team over time. We have sought support from the most prestigious Spanish scientific societies and three have accepted the task: These societies have named thematic editors who will help us strengthen their respective disciplines. Jacinto planta reproduccion asexual de las plantas front that we have opened to boost Animal Biodiversity and Conservation is the new webpage, remodelled for use as a medium to post our published papers.

With this move we not only hope to improve our services to readers but also look towards open access, open access in its broadest conception, offering the journal to scientists, both readers and authors, free of charge.

If we want science and the knowledge it generates —produced with public money— to belong to us all, we not only have to enable everyone to read it but we also have to help everyone publish, independently of their economic state.

These are difficult times for science, particularly in Spain. We hope that initiatives such as ours will accelerate the efforts of scientific societies and researchers to open knowledge to everyone. The impact of an invasive exotic bush on the stopover ecology of migrant passerines J. The impact of an invasive exotic bush on the stopover ecology of migrant passerines. Animal Biodiversity and Conservation, Abstract The impact of an invasive exotic bush on the stopover ecology of migrant passerines.

However, original habitat at stopover sites could be affected by invasive exotic plants outcompeting native vegetation. The impact of exotic plants on the stopover behavior of migrant bird species is poorly understood. To test these predictions, we used Jacinto planta reproduccion asexual de las plantas obtained in August at a ringing station in a coastal wetland in northern Iberia which contained both unaltered reedbeds Phragmites spp.

Passerines associated with reedbeds Jacinto planta reproduccion asexual de las plantas the migration period were used as model species, with a particular focus on sedge warblers Acrocephalus schoenobaenus.

The saltbush promoted a noticeable change on bird assemblage, which became enriched by species typical of woodland habitats. Sedge warblers departed with a higher fuel load, showed a higher fuel deposition rate, and stayed for longer in the control zone than in the invaded zone.

Invasive plants, such as saltbush, can impose radical changes on habitat, having a direct effect on the stopover strategies of migrants. The substitution of reedbeds by saltbushes in several coastal marshes in Atlantic Europe should be regarded as a problem with potential negative consequences for the conservation of migrant bird species associated with this habitat. Introduction Migration is considered to have carry—over effects on several parameters in the life cycle of avian migrants Newton, Generally, migrant birds cannot gain enough fuel at a single site to reach their destination areas in a single uninterrupted flight or in several flights without refuelling at en route stopovers.

They therefore need to stop over periodically to accumulate sufficiently high energy stores to accomplish the next flight bout successfully. Accordingly, any factor that affects fuel deposition rate, such as food availability or predator disturbance, can be crucial for migrant bird species in terms of migration success or survival. Exotic plants can displace native vegetation, causing habitat changes which are often linked to changes in biodiversity Vitousek et al.

This phenomenon also affects bird migrants when they land to refuel in an altered habitat e. This issue is worth taking into consideration, especially if we consider that several bird species, both at population and individual levels, tend to use the same stopover sites year after year Newton, Habitat changes in these Jacinto planta reproduccion asexual de las plantas can thus have negative consequences, even though alternative stopover sites may be available.

As a global hypothesis, it can be stated that native habitat change i. The predictions tested in this study were: Consequently, these species would not use areas heavily invaded by exotic plants. From a structural standpoint, the community may change toward species better adapted to the new conditions e. Consequently, migrants departing from a stopover site affected by exotic plants should have lower fuel loads than migrants departing from an unaffected site. The aim of this study was to evaluate the impact of exotic plants on the community structure and stopover ecology of migrant birds, particularly their effect on fuel load and fuel deposition rate.

We used data obtained at a coastal wetland in southwestern Europe that had both unaltered reedbeds Phragmites spp. The study was carried out at two levels: Material and methods Study system Reedbeds in Europe play a relevant role as stopover sites for marsh—associated birds during migratory periods Schaub et al.

This habitat, however, has suffered a notable decline in several areas due to the saltbush Sanz et al. Typical of plains within coastal marshes, it is currently widespread worldwide as an exotic, invasive plant that occupies wetlands with slight to moderate levels of brackish waters.

The saltbush has become a problem of primary importance in many wetlands in Europe, Asia and Australia, and it has been the target of numerous and usually costly management plans e.

Its eradication has thus been a priority in several projects e. The reed—associated warblers Acrocephalus spp. A paradigmatic case of this specialization is birds such as sedge warblers, which mainly forage on aphids Hyalopterus spp. During migration mainly from mid—July to September during the autumn migration periodthey preferably occupy reedbeds, both along the coast and inland Cramp, During the autumn migration period, the species accounts for ca.

The sedge warbler is a good avian model to test the effect of invasive plants on stopover behavior of migrants associated with reedbeds, since all birds captured in Urdaibai are non—breeding, true migrants. Study area and data collection Data were obtained at Urdaibai, a Ramsar coastal estuary in the southeastern Bay of Biscay, northern Iberia. The wetland spreads over an area of ha and has a relatively high richness of habitats, determined by tide regimens and the degree of salinity.

Such habitats range from beach and dunes situated within the lowest part of Urdaibai to tidal flats of limes and plant species adapted to tidal Jacinto planta reproduccion asexual de las plantas in the lower marsh and reedbeds and freshwater—associated vegetation in the upper marsh and nearby polders. Originally, both zones were occupied by reedbeds as dominant vegetation together with Juncus spp.

Hereafter, we will respectively call these zones 'control' and 'invaded'. Both zones are found in the upper marsh and are subject to daily tidal flooding. From July to September the area is used by warblers coming from the British Isles and Western—Central Europe Cantos, en route to their wintering areas in tropical Africa Cramp, Mist nets at both zones were open daily during August for a period of 4 h starting at dawn.

Since the sampling was carried out in parallel with another project, focused on finding key stopovers for the aquatic warbler A. Since the sampling effort with both mist nets and lures was constant in these two zones, using tape lures would not be expected to create any bias.

La reproducción asexual en plantas...

Once captured, each bird was ringed and its age first year or adult bird was determined according to Svensson Following measurements, the birds were released. No bird was retained for longer than 1 h.

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