Rehabilitation of alluvial landscapes along the River Hase (Ems river basin, Germany).

Stroh, Michael; Rémy, Dominique; Zimmermann, Kamil; Schwabe, Angelika

doi:10.1127/lr/15/2003/243

Cited by 3 publications

(2 citation statements)

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“…The 95% confidence interval (CI) is depicted by a dotted line (note the increase in CI with larger distances due to fewer replicates) valley (average F ST : 0.09) might be caused by the differing landscape structure of these areas. The restoration measures at the river Hase created new habitats (Stroh et al 2005), which might serve as stepping stones between populations resulting in genetic homogenization. The Ems area is stronger fragmented by pine forests (Pinus sylvestris), which might increase the separation of populations of A. vaga.…”

Section: Discussionmentioning

confidence: 99%

Strong genetic exchange among populations of a specialist bee, Andrena vaga (Hymenoptera: Andrenidae)

Exeler

Hochkirch

2007

Conserv Genet

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Habitat fragmentation is believed to be a key threat to biodiversity, with habitat specialists being stronger affected than generalists. However, pioneer species might be less affected by fragmentation, as their high colonization potential should increase gene flow. Here, we present an analysis of the genetic structure of populations of the solitary bee Andrena vaga, which naturally occurs in sandy habitats and is specialized on willow (Salix) pollen as larval food and sandy soils as nesting sites. While the species is widespread in the young sandy landscapes of our main study area (Emsland, northwestern Germany), it occurs less frequently in the Lower Rhine valley. Our analyses of six polymorphic microsatellites show that the populations are only slightly differentiated, suggesting a relatively strong gene flow. No genetic structure corresponding to the geographic origin was found as the variability within populations accounted for the major proportion of variation. F ST values were higher and allelic richness was lower in the Lower Rhine valley, supporting the hypothesis that habitat availability affects the degree of genetic exchange between populations. Inbreeding coefficients were generally high and nearly all populations had a heterozygote deficiency, which could be explained by the breeding strategy of A. vaga, which nests in aggregations.

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Section: Discussionmentioning

confidence: 99%

Strong genetic exchange among populations of a specialist bee, Andrena vaga (Hymenoptera: Andrenidae)

Exeler

Hochkirch

2007

Conserv Genet

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“…The two target vegetation types were (1) Diantho-Armerietum (plant communities typically characterized by the presence of Dianthus deltoides and Armeria elongata) and (2) Corynephoretum sand dune complexes (plant communities composed of typical pioneer species found on oligotrophic sandy soils such as Corynephorus canescens and Carex arenaria). The restoration measures included the removal of dykes and the creation of new artificial inland sand dune complexes, fluviatile sand layers and permanent or temporarily flooded hollows (Stroh et al 2005). The removal of dykes led to occasional flooding of restoration sites and helped to achieve the open character of a typical alluvial landscape.…”

Section: S T U D Y a R E A A N D R E S T O R A T I O N M E T H O Dmentioning

confidence: 99%

Restoration of riverine inland sand dune complexes: implications for the conservation of wild bees

Exeler

Kratochwil

Hochkirch

2009

Journal of Applied Ecology

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Summary1. The evaluation of restoration measures is an important task of conservation biology. Inland sand dunes and dry, oligotrophic grasslands have become rare habitat types in large parts of Central Europe and their restoration and management is of major importance for the preservation of many endangered plant and insect species. Within such habitats, it is important to restore key ecosystem services, such as pollination networks. As wild bees are the most important pollinators in many ecosystems, they represent a suitable key group to evaluate restoration measures. Furthermore, the recent decline of many bee species and the potential ecological and economic consequences are currently topics of strong scientific interest. 2. We studied the succession of bee communities in response to restoration measures of sand dunes and sand grasslands and compared these communities with those of old sand dune complexes. 3. Our results show that wild bees respond rapidly to restoration measures indicated by a high species richness and abundance. The community structure of bees at restoration sites converged only slightly to those of the target sites. A higher similarity was found between bee communities at the restoration sites (sand dunes and grasslands), indicating that their close proximity was an important determinant of species overlap. Environmental factors such as the number of entomophilous plant species and moisture had a strong influence on wild bee species composition. 4. Synthesis and applications. The restoration of inland sand dune complexes provides opportunities for colonization by a diverse wild bee community. Although it is difficult to establish a given target community, restoration measures gave rise to a high pollinator diversity and abundance, suggesting that community function can be re-established.

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Fourteen years of restoration and extensive year round grazing with free foraging horses and cattle and its effect particularly on dry species rich riverine levee grasslands

Sýkora¹,

Stuiver²,

Ronde³

et al. 2009

phyto

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Rehabilitation of alluvial landscapes along the River Hase (Ems river basin, Germany).

Cited by 3 publications

References 0 publications

Strong genetic exchange among populations of a specialist bee, Andrena vaga (Hymenoptera: Andrenidae)

Strong genetic exchange among populations of a specialist bee, Andrena vaga (Hymenoptera: Andrenidae)

Restoration of riverine inland sand dune complexes: implications for the conservation of wild bees

Fourteen years of restoration and extensive year round grazing with free foraging horses and cattle and its effect particularly on dry species rich riverine levee grasslands

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