Mühlenberg, Michael

[["dc.bibliographiccitation.firstpage","1351"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Ecological Applications"],["dc.bibliographiccitation.lastpage","1366"],["dc.bibliographiccitation.volume","15"],["dc.contributor.author","Waltert, Matthias"],["dc.contributor.author","Bobo, K. S."],["dc.contributor.author","Sainge, N. Moses"],["dc.contributor.author","Fermon, H."],["dc.contributor.author","Muhlenberg, M."],["dc.date.accessioned","2018-11-07T10:57:02Z"],["dc.date.available","2018-11-07T10:57:02Z"],["dc.date.issued","2005"],["dc.description.abstract","Although the Guinea-Congolian rain forest region is an important focal point for conservation in Africa, very little information is available on the effects of forest modification and land use on the region's biodiversity. We studied bird communities and vegetation characteristics in 24 sampling stations distributed over two near-natural forests (near-primary forest, secondary forest), and two land use types (agroforestry, annual cultures) in the lowlands of the Korup region, Cameroon. Repeated sampling was used to establish near-complete inventories of bird assemblages for each site. Despite a 90% average drop in tree basal area, from forest to farmland, overall bird species richness did not decrease significantly with increasing habitat modification. However, different groups of birds responded in different ways. Frugivorous and omnivorous bird species richness did not differ between habitats, whereas richness in granivorous, flower-visiting, and nonbreeding species was higher in land use systems compared to forests. In contrast, insectivorous birds, especially terrestrial and large arboreal foliage gleaning insectivores, and ant followers showed,a declining species richness from forest to farmland. Also, richness in species of those restricted to the Guinea-Congolian forest biome and of the family Pycnonotidae showed a pronounced decline with increasing habitat modification. Species richness of overall insectivores, terrestrial insectivores, large- and medium-sized arboreal foliage gleaners, ant followers, as well as pycnonotids and biome-restricted species, were strongly or even very strongly positively correlated with overstory tree density and, in most cases, also with basal area. In contrast, tree density and basal area were strongly negatively correlated with species richness of nonbreeding visitors and flower-visiting bird species. Species composition was most distinct between near-primary forest and annual culture sites, and the abundance of 23 out of 165 species was affected by habitat, suggesting considerable partitioning of habitat niches along the habitat gradient. Our results stress the importance of tree cover in tropical land use systems for the maintenance of resident forest bird populations and confirm that natural forest management is more beneficial for global bird conservation compared to other forms of forest exploitation, including agroforestry systems."],["dc.identifier.doi","10.1890/04-1002"],["dc.identifier.isi","000230876900023"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/50154"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Ecological Soc Amer"],["dc.relation.issn","1051-0761"],["dc.title","From forest to farmland: Habitat effects on afrotropical forest bird diversity"],["dc.type","review"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","29"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Journal of Insect Conservation"],["dc.bibliographiccitation.lastpage","42"],["dc.bibliographiccitation.volume","10"],["dc.contributor.author","Bobo, K. S."],["dc.contributor.author","Waltert, Matthias"],["dc.contributor.author","Fermon, H."],["dc.contributor.author","Njokagbor, J."],["dc.contributor.author","Muhlenberg, M."],["dc.date.accessioned","2018-11-07T10:13:20Z"],["dc.date.available","2018-11-07T10:13:20Z"],["dc.date.issued","2006"],["dc.description.abstract","Worldwide, tropical landscapes are increasingly dominated by human land use systems and natural forest cover is decreasing rapidly. We studied frugivorous butterflies and several vegetation parameters in 24 sampling stations distributed over near-primary forest (NF), secondary forest (SF), agroforestry and annual culture sites in the Northeastern part of the Korup region, SW Cameroon. As in other studies, both butterfly species richness and abundance were significantly affected by habitat modification. Butterfly richness and abundance were highest in SF and agroforestry sites and significantly lower in NF and annual crop sites. Butterfly species richness increased significantly with increasing tree density, but seemed to decrease with increasing herb diversity and density in annual crop farms. A significant negative correlation was found between butterfly geographic range and their preference for NF sites. Our results also showed that agroforestry systems, containing remnants of natural forest, can help to sustain high site richness, but appear to have low complementarity through loss of endemic species confined to more undisturbed habitats. Our study also indicated that the abundance of selected restricted-range butterflies, particularly in the family Nymphalidae, appears to be a good indicator to assess and monitor forest disturbance."],["dc.identifier.doi","10.1007/s10841-005-8564-x"],["dc.identifier.isi","000235150200004"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/40413"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1366-638X"],["dc.title","From forest to farmland: butterfly diversity and habitat associations along a gradient of forest conversion in Southwestern Cameroon"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","333"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Biodiversity and Conservation"],["dc.bibliographiccitation.lastpage","350"],["dc.bibliographiccitation.volume","14"],["dc.contributor.author","Fermon, H."],["dc.contributor.author","Waltert, Matthias"],["dc.contributor.author","Vane-Wright, R. I."],["dc.contributor.author","Muhlenberg, M."],["dc.date.accessioned","2018-11-07T11:24:43Z"],["dc.date.available","2018-11-07T11:24:43Z"],["dc.date.issued","2005"],["dc.description.abstract","Protected forest areas of Sulawesi are gradually being replaced by intensively used agroforestry systems and farmland, especially in lowland and sub-montane regions. Studies on the impact of these man-induced changes on biodiversity are of urgent conservation concern. We compared the fruit-feeding butterfly assemblage of a natural hill forest to that of a disturbed hill forest, representing a mosaic of old secondary forest and recently abandoned or active subsistence farms. Overall, species richness seemed highest in the disturbed site, but both abundance and diversity of endemic butterflies were significantly higher in the natural forest. Although the butterfly assemblage showed a clear vertical structure in the natural forest, vertical stratification was no longer pronounced at the disturbed site. Comparative studies based on diversity estimates from ground samples should consider not only the scale at which sampling is carried out and influences from nearby habitat patches in the surrounding landscape mosaic, but also possible behavioural changes in stratified species after forest modification. This study shows that higher overall species richness does not imply higher species distinctiveness, and indicates that the contribution of land-use systems to global biodiversity should be evaluated with caution, even when relatively high species richness estimates are found."],["dc.identifier.doi","10.1007/s10531-004-5054-9"],["dc.identifier.isi","000227153600005"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/56470"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0960-3115"],["dc.title","Forest use and vertical stratification in fruit-feeding butterflies of Sulawesi, Indonesia: impacts for conservation"],["dc.type","review"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","177"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","African Entomology"],["dc.bibliographiccitation.lastpage","185"],["dc.bibliographiccitation.volume","9"],["dc.contributor.author","Fermon, H."],["dc.contributor.author","Schulze, Christian H."],["dc.contributor.author","Waltert, Matthias"],["dc.contributor.author","Muhlenberg, M."],["dc.date.accessioned","2018-11-07T08:39:35Z"],["dc.date.available","2018-11-07T08:39:35Z"],["dc.date.issued","2001"],["dc.description.abstract","The Noyau Central (c. 4777 ha) in south-central Benin is the largest remaining natural forest within the Dahomey Gap. Based on field work conducted in 1998, a preliminary list of 83 butterfly species is presented for this largely unknown core area of the Lama Forest. Forty butterfly species were documented for the first time in Benin. Forty-one are true lowland forest specie, not found in savanna. Overall species richness was higher in clearings, than in closed forest. However, a high proportion of forest species, especially those with a more restricted geographic range, were exclusively captured in the forest patches. Because other forest areas in Benin are much smaller, the Noyau Central is likely to contribute critically to the conservation of the country's butterfly fauna."],["dc.identifier.isi","000172339600008"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/19031"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Entomological Soc Southern Africa"],["dc.relation.issn","1021-3589"],["dc.title","The butterfly fauna of the Noyau Central, Lama Forest (Republic of Benin), with notes on its ecological composition and geographic distribution"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]