Mühlenberg, Michael

[["dc.bibliographiccitation.firstpage","327"],["dc.bibliographiccitation.lastpage","349"],["dc.contributor.author","Waltert, Matthias"],["dc.contributor.author","Langkau, Maike"],["dc.contributor.author","Maertens, Miet"],["dc.contributor.author","Härtel, Michael"],["dc.contributor.author","Erasmi, Stefan"],["dc.contributor.author","Mühlenberg, Michael"],["dc.contributor.editor","Gerold, Gerhard"],["dc.contributor.editor","Fremerey, M."],["dc.contributor.editor","Guhardja, Edi"],["dc.date.accessioned","2020-05-12T08:32:54Z"],["dc.date.available","2020-05-12T08:32:54Z"],["dc.date.issued","2004"],["dc.description.abstract","Tropical deforestation and forest fragmentation are probably the most serious threats to biodiversity (see Turner 1996) and it has been theoretically stated that even the largest protected areas in the tropics might be too small to sustain populations of all species of the original system (Terborgh 1999). But species loss in forest fragments is a complex process and appears often only after considerable time lags, especially in vertebrates (Brooks et al. 1999b). Therefore, empirical evidence for such extinctions can only be obtained from areas with a long deforestation history and long-known faunal composition (e.g. van Balen 1999). Such empirical data are scarce but are essential in order to convince land use managers of the long-term effects of forest loss on biodiversity. Species area models, however, are a valuable tool in the prediction of tropical vertebrate species loss (van Balen 1999; Brooks et al. 1997, 1999a, c, 2002; Cowlishaw 1999)."],["dc.identifier.doi","10.1007/978-3-662-08237-9_19"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/65139"],["dc.language.iso","en"],["dc.publisher","Springer"],["dc.relation.eisbn","978-3-662-08237-9"],["dc.relation.isbn","978-3-642-05617-8"],["dc.relation.ispartof","Land Use, Nature Conservation and the Stability of Rainforest Margins in Southeast Asia. Environmental Science."],["dc.title","Predicting Losses of Bird Species from Deforestation in Central Sulawesi"],["dc.type","book_chapter"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1339"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Conservation Biology"],["dc.bibliographiccitation.lastpage","1346"],["dc.bibliographiccitation.volume","18"],["dc.contributor.author","Waltert, Matthias"],["dc.contributor.author","Mardiastuti, A."],["dc.contributor.author","Muhlenberg, M."],["dc.date.accessioned","2018-11-07T10:45:05Z"],["dc.date.available","2018-11-07T10:45:05Z"],["dc.date.issued","2004"],["dc.description.abstract","There is still much debate over the potential value of land-use systems for the maintenance of tropical biodiversity. An increasing number of studies indicate that much forest biodiversity can also be found in the agricultural landscape matrix. Because there is little information on the potential value of land-use systems for tropical forest bird species, we conducted repeated point counts in near-primary forest, adjacent young secondary forest, modernized cacao agroforestry systems, and annual cultures at submontane elevations in central Sulawesi, Indonesia. Species richness decreased from natural forest and young secondary forest to agroforestry systems and annual cultures. Although species richness was similar between natural and young secondary forest, the number of endemic bird species was significantly lower in second-growth forest. Species composition gradually changed as the habitat changed from natural to secondary forest, agroforestry systems, and annual cultures. Despite close proximity to near-primary forest, the agroforestry systems studied supported only a few small frugivorous-nectarivorous species. Our results suggest that secondary forest could play an important role in the conservation of many Sulawesi bird species, but, although suitable for colonization, its potential to sustain populations over the long term is unknown. Improvement of the landscape matrix for biodiversity conservation through secondary habitats therefore seems desirable to enlarge the ranges of forest species, but the fight against land conversion within protected areas of the region should be of much higher importance, at least at present."],["dc.identifier.doi","10.1111/j.1523-1739.2004.00127.x"],["dc.identifier.isi","000224071800019"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/47416"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Blackwell Publishing Inc"],["dc.relation.issn","0888-8892"],["dc.title","Effects of land use on bird species richness in Sulawesi, Indonesia"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["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","257"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Bird Conservation International"],["dc.bibliographiccitation.lastpage","273"],["dc.bibliographiccitation.volume","15"],["dc.contributor.author","Waltert, Matthias"],["dc.contributor.author","Mardiastuti, A."],["dc.contributor.author","Muhlenberg, M."],["dc.date.accessioned","2018-11-07T10:55:56Z"],["dc.date.available","2018-11-07T10:55:56Z"],["dc.date.issued","2005"],["dc.description.abstract","To estimate the potential of forest birds to persist in the increasingly deforested island of Sulawesi, we undertook a mist-net survey in the understorey of natural as well as modified forest (forest garden and heavily logged forest) at submontane elevations in Central Sulawesi. A total of forty 102 m mist-net lines were distributed over five 16 ha study sites. Two of the sites were situated in an extensively forested valley, and three in a valley with severely fragmented forest. Of 23 species captured, only seven were typical understorey dwellers of submontane forest, five of which are Sulawesi region endemics. Most were found in similar numbers in natural and modified forest, but one species was significantly more common in modified forest. Of the five endemics, two species were confined to, and one species was significantly more abundant in, the extensively forested valley compared with the severely deforested valley. Our results suggest that the conservation of the remaining submontane forest is crucial to the conservation of Central Sulawesi's understorey bird diversity, but that many Sulawesi endemics might be able to survive in modified habitats."],["dc.identifier.doi","10.1017/S0959270905000432"],["dc.identifier.isi","000233214200003"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/49900"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Cambridge Univ Press"],["dc.relation.issn","0959-2709"],["dc.title","Effects of deforestation and forest modification on understorey birds in Central Sulawesi, Indonesia"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","603"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","The Journal of Wildlife Management"],["dc.bibliographiccitation.lastpage","610"],["dc.bibliographiccitation.volume","72"],["dc.contributor.author","Waltert, Matthias"],["dc.contributor.author","Meyer, Britta"],["dc.contributor.author","Shanyangi, Mussa Wilson"],["dc.contributor.author","Balozi, Johannes John"],["dc.contributor.author","Kitwara, Omari"],["dc.contributor.author","Qolli, Stephan"],["dc.contributor.author","Krischke, Hubert"],["dc.contributor.author","Muehlenberg, Michael"],["dc.date.accessioned","2018-11-07T11:16:41Z"],["dc.date.available","2018-11-07T11:16:41Z"],["dc.date.issued","2008"],["dc.description.abstract","Reliable assessments of large mammal population sizes are crucial for the management of protected areas. We tested feasibility of foot surveys for population assessments of large mammals in western Tanzanian woodland, comparing estimates of herbivore densities from line-transect data from a National Park with those from an adjacent Game Reserve (GR). We used a Geographic Information System (GIS) and Global Positioning System-supported field design, consisting of systematically distributed closed-circuit transects, and recorded sighting distances and angles. Total survey effort was 1,032 km, conducted within the dry season. We fitted detection functions to distance data with the help of DISTANCE 4.1, using the 3 habitat categories woodland, grassland, and swamp as covariates for detection probability. We found estimates of density and abundance to be reliable for 19 out of 20 larger mammalian herbivores and found significant differences in density between the Park and the GR for 5 species, of which 4 had a higher density in the Park and one had a higher density in the GR. Our results show that, using GIS support and modern navigation methods, foot-transect surveys can be effective in providing accurate data on woodland herbivore populations even in large study areas."],["dc.identifier.doi","10.2193/2006-456"],["dc.identifier.isi","000254412800004"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/54652"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","0022-541X"],["dc.title","Foot surveys of large mammals in woodlands of western Tanzania"],["dc.type","journal_article"],["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","4143"],["dc.bibliographiccitation.issue","13"],["dc.bibliographiccitation.journal","Biodiversity and Conservation"],["dc.bibliographiccitation.lastpage","4158"],["dc.bibliographiccitation.volume","15"],["dc.contributor.author","Pangau-Adam, Margaretha Z."],["dc.contributor.author","Waltert, Matthias"],["dc.contributor.author","Muehlenberg, Michael"],["dc.date.accessioned","2018-11-07T08:52:06Z"],["dc.date.available","2018-11-07T08:52:06Z"],["dc.date.issued","2006"],["dc.description.abstract","Forest loss and fragmentation in Indonesia may seriously affect the survivorship of forest birds and lead to local extinction of bird populations. We used 786 artificial nests baited with quail eggs to examine the effect of habitat alteration on nest predation in Lore Lindu National Park, Sulawesi. Natural forest and four habitats of forest margin areas: forest edge, forest gardens, coffee plantations, and secondary forest, were studied. Two types of artificial nests, ground and shrub nests were placed in these habitats at two different locations for a period of 8 days. In addition, we used automatic cameras and cage-traps to identify the predators. Nests in shrubs experienced significantly higher predation rates in forest margin areas than in natural forest. Predation on ground nests did not differ significantly between these habitat types, but was significantly higher than that on shrub nests in each habitat except forest edge. Rodents were the most common predators of both nests, but shrub nests were also susceptible to Dwarf cuscus (Strigocuscus celebensis), squirrels, and tree snakes. The nest predation rates we found were among the highest found in tropical rainforests, probably a consequence of the unique predator assemblages of Sulawesi. These results suggest that egg survival is negatively affected by human intervention and that human-induced habitats might have only limited importance for the conservation of Sulawesi's largely endemic understorey avifauna. These considerations might be important since forest margins comprise significant proportions of protected areas on Sulawesi and play an important role in future Park zoning concepts as well as in conservation-oriented land use management."],["dc.identifier.doi","10.1007/s10531-005-3370-z"],["dc.identifier.isi","000242418500007"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/22091"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0960-3115"],["dc.title","Nest predation risk on ground and shrub nests in forest margin areas of Sulawesi, Indonesia"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","735"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Oryx"],["dc.bibliographiccitation.lastpage","742"],["dc.bibliographiccitation.volume","49"],["dc.contributor.author","Pangau-Adam, Margaretha Z."],["dc.contributor.author","Muehlenberg, Michael"],["dc.contributor.author","Waltert, Matthias"],["dc.date.accessioned","2018-11-07T09:51:17Z"],["dc.date.available","2018-11-07T09:51:17Z"],["dc.date.issued","2015"],["dc.description.abstract","Nominally protected areas in Papua are under threat from encroachment, logging and hunting. The northern cassowary Casuarius unappendiculatus is the largest frugivore of the lowland rainforest of New Guinea and is endemic to this region, and therefore it is an important conservation target and a potential flagship species. We investigated effects of habitat degradation on the species by means of distance sampling surveys of 58 line transects across five distinct habitats, from primary forest to forest gardens. Estimated cassowary densities ranged from 14.1 (95% CI 9.2-21.4) birds km(-2) in primary forest to 1.4 (95% CI 0.4-5.6) birds km(-2) in forest garden. Density estimates were intermediate in unlogged but hunted natural forest and in >30 year-old secondary forest, and considerably lower in recently logged (<3 years) forest. Cassowary abundance was positively correlated with canopy cover and with tree height and diameter, and negatively correlated with hunting traps and human trails. In generalized linear models cassowary abundance was best explained by the number of fruiting trees and potential water sources. The results suggest that although the northern cassowary is moderately tolerant of intermediate disturbance it is relatively intolerant of heavy disturbance such as intensive logging. To secure the populations of northern cassowary and of other large animal species in Papua, forest degradation needs to be addressed by enforcing regulations in existing protection forest and/or establishing new protected areas, such as wildlife reserves."],["dc.identifier.doi","10.1017/S0030605313001464"],["dc.identifier.isi","000361383100029"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/12938"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/35884"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Cambridge Univ Press"],["dc.relation.issn","1365-3008"],["dc.relation.issn","0030-6053"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Rainforest disturbance affects population density of the northern cassowary Casuarius unappendiculatus in Papua, Indonesia"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","52"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Oryx"],["dc.bibliographiccitation.lastpage","59"],["dc.bibliographiccitation.volume","43"],["dc.contributor.author","Kiffner, Christian"],["dc.contributor.author","Meyer, Britta"],["dc.contributor.author","Muehlenberg, Michael"],["dc.contributor.author","Waltert, Matthias"],["dc.date.accessioned","2018-11-07T08:35:18Z"],["dc.date.available","2018-11-07T08:35:18Z"],["dc.date.issued","2009"],["dc.description.abstract","We present a study from Katavi National Park and surrounding areas that assessed the size and structure of the lion population as a baseline for wildlife management. We assessed lion and prey species density directly by sample surveys that incorporated specific detection probabilities. By using three prey-biomass regression models we also indirectly estimated lion density based on the assumption that these indirect estimates represent the Park's carrying capacity for lions. To identify key factors influencing lion abundance we conducted Spearman Rank correlation and logistic regression analyses, using prey species abundance and distance to Park boundary as explanatory variables. The mean size of the lion population was 31-45% of the estimated carrying capacity, with considerably fewer subadult males observed than expected. Lions generally avoided areas of up to 3 km from the Park boundary and were not observed outside the Park. Abundance of common prey species was significantly correlated with distance to the Park boundary and lion abundance. Lion abundance was most strongly associated with waterbuck abundance/presence. Based on observed lion demography, an evaluation of hunting quotas in adjacent hunting blocks, and anecdotal information on traditional lion hunting, we hypothesize that anthropogenic mortality of lions outside Katavi National Park is affecting lion abundance within the Park. Our results suggest that estimating lion densities with prey-biomass regression models overestimates densities even inside protected areas if these areas are subject to natural and anthropogenic edge effects."],["dc.identifier.doi","10.1017/S0030605307002335"],["dc.identifier.isi","000263400700011"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/18031"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Cambridge Univ Press"],["dc.relation.issn","0030-6053"],["dc.title","Plenty of prey, few predators: what limits lions Panthera leo in Katavi National Park, western Tanzania?"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","257"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Oryx"],["dc.bibliographiccitation.lastpage","265"],["dc.bibliographiccitation.volume","36"],["dc.contributor.author","Waltert, Matthias"],["dc.contributor.author","Lien, Lien"],["dc.contributor.author","Faber, K."],["dc.contributor.author","Muhlenberg, M."],["dc.date.accessioned","2018-11-07T10:23:31Z"],["dc.date.available","2018-11-07T10:23:31Z"],["dc.date.issued","2002"],["dc.description.abstract","The diurnal primate community of the Korup area of south-west Cameroon is rich in species and high in endemism. Two years monitoring in the Support Zone around Korup National Park have shown that, although all species of the original community are still present, Preuss' red colobus and drill, which were considered to be threatened in the early 1990s, have declined further and are probably facing local extinction. Densities of the crowned monkey also seem to have declined. Only mona and putty-nosed monkeys have an expanded distribution, and densities that are within the range of those reported from previous studies in the region. Although hunting is the most important cause of these declines, logging also appears to be having a detrimental effect. In logged forest group densities of chimpanzee, red-capped mangabey, mona monkey and red-eared monkey decreased between the two survey years, whilst remaining constant or increasing in unlogged forest. The frequency of associations of guenon species did not differ between logged and unlogged study sites, but encounters of associations of all four guenon species were only found in unlogged forest. We strongly recommend enforcement of anti-poaching activities inside the Korup National Park, and establishment of wildlife management in the Support Zone, as only a combined strategy can successfully guarantee the persistence of the wildlife of the region."],["dc.identifier.doi","10.1017/S0030605302000479"],["dc.identifier.isi","000177616900013"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/42472"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Cambridge Univ Press"],["dc.relation.issn","0030-6053"],["dc.title","Further declines of threatened primates in the Korup Project Area, south-west Cameroon"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]