Sileshi Nemomissa

Sileshi Nemomissa
Addis Ababa University | AAU · Department of Plant Biology and Biodiversity Management

Ph.D

About

120
Publications
26,219
Reads
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2,118
Citations
Additional affiliations
February 2007 - February 2007
National Museums of Kenya
Position
  • Guest Researcher
June 2000 - August 2000
University of Vienna
Position
  • Guest Researcher
September 1999 - December 2000
Université de Neuchâtel
Position
  • Guest Researcher

Publications

Publications (120)
Article
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The multifunctional role of shade trees for conservation of biodiversity and ecosystem services in natural forests and agroforests is well documented, yet we lack insights into the impact of shade tree species identity on pest and disease dynamics on agroforestry crops such as coffee and cacao, and its implications for management. We conducted two...
Article
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A good characterization of time series rainfall and temperature trends, variability, and prediction is necessary for many studies in climatology, hydrology, agriculture, and forestry. It provides input for policymakers and practitioners that help to make informed decisions and allows the identification of deviations due to global climate change. Th...
Article
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Background The study aimed at documenting the indigenous and local knowledge and use of traditional medicinal plants for treating human and livestock ailments in Dawuro Zone of Ethiopia. Methods A survey was conducted among traditional healers and native administrators through discussion, interviews, and field observations. The snowball sampling t...
Article
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This research was done in Arsi-Bale Massif remnant vegetation of southeast Ethiopia to investigate vascular plant diversity and endemism in forest patch, riverine, and grazing land-use types. A total of 126 quadrats, each with 900 m2 (30 m × 30 m), were selected systematically along the altitudinal gradient. Shannon Weiner Diversity index and R Pac...
Article
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Highland bamboo (Oldeania alpina formerly Arundinaria alpina or Yushania alpina) is a species of significant conservation value in Afromontane ecosystems across Africa. It also plays a significant role in the livelihoods of local communities. However, global climate change is anticipated to alter its ecological niche, leading to range shifts and po...
Article
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Conventional wisdom states that genetic variation reduces disease levels in plant populations. Nevertheless, crop species have been subject to a gradual loss of genetic variation through selection for specific traits during breeding, thereby increasing their vulnerability to biotic stresses such as pathogens. We explored how genetic variation in Ar...
Article
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Continuing climate change may cause shifts in the adaptive ranges of plant species. But this impact is less understood for many species in the tropics. Here, we examined the distribution of the current and future potential suitable habitats of two native forest spices Piper capense and Aframomum corrorima . We have used MaxEnt software to predict t...
Article
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Epiphytes colonize canopy trees, provide substantial ecosystem services in production and nutrient cycling, contribute as energy sources, shelter and breeding sites for pollinating birds, bats and ants. Despite this, information on their diversity is patchy. Therefore, this study was investigated vascular epiphytes diversity in Kafa biosphere reser...
Article
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Context Human disturbances can have large impacts on forest structure and biodiversity, and thereby result in forest degradation, a property difficult to detect by remote sensing. Objectives To investigate spatial variation in anthropogenic disturbances and their effects on forest structure and biodiversity. Methods In 144 plots of 20 × 20 m dist...
Article
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1. Tropical agroforestry systems provide farmers with resources for their livelihoods, but are also well recognized as refuges for biodiversity. However, the relationship between yield and biodiversity might be negative in these systems, reflecting a potential trade‐off between managing for increased yield or biodiversity. The potential for synergi...
Article
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Low-altitude lakes in eastern Africa have long been investigated and have provided valuable information about the Late Quaternary paleohydrological evolution, such as the African Humid Period. However, records often suffer from poor age control, resolution, and/or ambiguous proxy interpretation, and only little focus has been put on high-altitude r...
Preprint
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Background Human mismanagement of natural habitats caused the great loss of biodiversity and ecosystem because of their conversion into modified landscapes. On the other hand, agroecosystems are playing vital role in terms of retaining and conserving certain overstorey trees and associated perennial crops in addition to the small fauna. The main ob...
Article
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Species tend to shift their suitable habitat both altitudinally and latitudinally under climate change. Range shift in plants brings about habitat contraction at rear edges, forcing leading edge populations to explore newly available suitable habitats. In order to detect these scenarios, modeling of the future geographical distribution of the speci...
Preprint
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The distributions of the potential adaptive ranges of iconic plant species are not yet fully known especially in regions such as Ethiopia where high climatic variability and vegetation types are found. This study was undertaken to predict the distributions of the potential suitable habitats of Pouteria adolfi-friederici and Prunus africana tree spe...
Preprint
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Introduction: For generations, many plants were extracted to find drugs and to discover novel and new chemical structures from extracts. Maerua oblongifolia (Forsk.) A. Rich, “Sangganaa” in Dawuro language is a locally threatened traditional medicinal plant, which is traditionally used to treat diarrhea. The present study aimed to check the chemica...
Article
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With the current deforestation rates in tropical ecosystems, optimizing biodiversity in managed systems has become fundamental for conservation. Agroforestry has been suggested to conserve biodiversity and buffer deforestation rates, while also sustaining local livelihoods. While many studies have focused on the relation between local management in...
Article
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Agroforestry systems can provide habitats for a rich biodiversity including multitrophic interactions, which presents opportunities to develop natural pest control. Shade coffee systems in several coffee growing areas of the world host such unique habitats where pests and their natural enemies interact. One of the major global challenges for coffee...
Article
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While top‐down control plays an important role in shaping both natural and agricultural food webs, we lack insights into how top‐down control effects vary across spatial scales. We used a multi‐scale survey of top‐down control of coffee pests and diseases by arboreal ants to examine if colony location creates a small‐scale mosaic in top‐down contro...
Article
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Questions In some fire‐prone ecosystems, bryophytes play a crucial role by providing the surface fuel that controls the fire return interval. Afroalpine heathlands are such an ecosystem, yet almost nothing is known about the bryophytes in this system. We do not know the level of species richness, or if there is a successive accumulation of species...
Article
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The hydrogen isotopic composition of leaf wax–derived n -alkane (δ ² H n -alkane ) and oxygen isotopic composition of hemicellulose–derived sugar (δ ¹⁸ O sugar ) biomarkers are valuable proxies for paleoclimate reconstructions. Here, we present a calibration study along the Bale Mountains in Ethiopia to evaluate how accurately and precisely the iso...
Preprint
Research Highlights: Hagenia abyssinica is geographically localized, poor regenerated and endangered species in Ethiopia. Ethiopia has been experiencing variability of rainfall and rise in temperature due to the climate change. This study has hypothesized that the suitable areas for the species will be narrowed by the year 2070. Background and Obje...
Article
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Ethiopia aims to restore 15 million ha degraded forests and woodlands, but effects on the potentially contrasting goals of long-term carbon storage, biodiversity and sustainable livelihoods are unknown. To quantify the effects of grazing exclusion on vegetation and fire behaviour, we established six 30 × 30 m fenced exclosures with grazed controls,...
Article
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Plants, including those managed by humans, are often attacked by multiple diseases. Yet, most studies focus on single diseases, even if the disease dynamics of multiple species is more interesting from a farmers’ perspective. Moreover, most studies are from single management systems, although it is valuable to understand how diseases are distribute...
Article
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Distantly related lineages of the enigmatic giant rosette plants of tropical alpine environments provide classical examples of convergent adaptation. For the giant senecios (Dendrosenecio), the endemic landmarks of the East African sky islands, it has also been suggested that parallel adaptation has been important for within-lineage differentiation...
Article
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East Africa is an underrepresented region in respect of monitoring the stable isotopic composition of precipitation (δ¹⁸Oprec and δ²Hprec). In 2017, we collected precipitation samples from ten weather stations located along an altitudinal transect ranging from 1304 to 4375 m a.s.l. The δ¹⁸Oprec and δ²Hprec values varied from –8.7 to +3.7 ‰ and –38...
Research
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This study was carried out in KT Zone, Ethiopia aimed to identify the taxonomic diversity of medicinal plants (MPs), and document the local knowledge. The methods used for ethnobotanical data collection were semi-structured interviews, field observation, and focus group discussion. Correlation coefficients, Informant Consensus Factor (ICF), and Jac...
Article
Full-text available
This study was carried out in KT Zone, Ethiopia aimed to identify the taxonomic diversity of medicinal plants (MPs), and document the local knowledge. The methods used for ethnobotanical data collection were semi-structured interviews, field observation, and focus group discussion. Correlation coefficients, Informant Consensus Factor (ICF), and Jac...
Article
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Erica is a dominant vegetation type in many sub-afroalpine ecosystems, such as the Bale Mountains in Ethiopia. However, the past extent of Erica is not well known and climate versus anthropogenic influence on altitudinal shifts are difficult to assign unambiguously, especially during the Holocene. The main objective of the present study is to chemo...
Article
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Today, on the Sanetti Plateau in the Bale Mountains of Ethiopia, only fragmented patches of Erica species can be found at high altitudes (between 3900 and 4200 m a.s.l.). However, it is hypothesized that during the later part of the last glacial period and the early Holocene the plateau was extensively covered by Erica shrubs. Furthermore, it is as...
Article
Studies of early human settlement in alpine environments provide insights into human physiological, genetic, and cultural adaptation potentials. Although Late and even Middle Pleistocene human presence has been recently documented on the Tibetan Plateau, little is known regarding the nature and context of early persistent human settlement in high e...
Preprint
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Wetlands are one of the crucial natural resources. They provide invaluable biodiversity resources, aid in water quality improvement, support ground water recharge, help in moderating climate change and support flood control. Environment is in the other hand, where we live and something, we are very familiar with our day to day life. Geographic Info...
Article
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: Despite the fact that the vegetation pattern and history of the Bale Mountains in Ethiopia were reconstructed using pollen, little is known about the former extent of Erica species. The main objective of the present study is to identify unambiguous chemical proxies from plant-derived phenolic compounds to characterize Erica and other keystone spe...
Article
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Background: Traditional management regimes and knowledge systems of forest resources have shaped forests throughout the world where materials from individual species are harvested in a sustainable manner. To comprehend this, the vegetation of Hugumburda-Gratkhassu Forest was described and related to anthropogenic factors. Methods: Three ethnobot...
Article
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Species are often controlled by biotic factors such as competition at the warm edge of their distribution range. Disturbances at the treeline, disrupting competitive dominance, may thus enable alpine species to utilize lower altitudes. We searched for evidence for range expansion in grazed, fire‐managed Ethiopian subalpine Erica heathlands across a...
Experiment Findings
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Enset (Ensete ventricosum (Welw.) Cheesman) is an endemic multipurpose Ethiopian crop with a potential for food security for it grows in areas where there is a high population pressure and scarce cultivable land. Studies indicate that pests and diseases are among the challenges to sustainability of enset agriculture. A survey on diversity, challeng...
Article
One hundred and thirty-nine taxa of mosses are reported from the montane forest zone of southwest Ethiopia. Of these, 53 taxa are new country records and Meteoriopsis reclinata (Müll.Hal.) M.Fleisch. ex Broth. is, in addition, new to Africa. Most of the new records are of species also found in Uganda, Kenya or Tanzania, but there are some surprises...
Article
Local extinction after habitat modifications is often delayed, leading to an extinction debt. Our first aim was to develop a conceptual model for natural and human-mediated habitat improvements after a disturbance that may waive part of the predicted extinction debt. Second, we wanted to test this model on the distribution of epiphytic plants on tr...
Article
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The scattered eastern African high mountains harbor a renowned and highly endemic flora, but the taxonomy and phylogeographic history of many plant groups are still insufficiently known. The high-alpine populations of the Geranium arabicum/kilimandscharicum complex present intricate morphological variation and have recently been suggested to compri...
Data
Summary results of STRUCTURE analyses. a) Log likelihood of the data,L(K), as a function of K ranging from 1 to 10. b) Mean DeltaK for the rate of change in the probability between successive runs, DeltaK as a function of K, calculated according to [33]. c) Average similarity coefficients for the pairwise comparisons among 10 runs for a given K. (D...
Data
Mantel test for correlation between pairwise genetic-distance (Fst) and geographic-distance (P< 0.001; 1000 permutation). a) for the total dataset, b) G. kilimandscharicum and c) G. arabicum genetic groups. (DOCX)
Article
High tropical mountains harbor remarkable and fragmented biodiversity thought to a large degree to have been shaped by multiple dispersals of cold-adapted lineages from remote areas. Few dated phylogenetic/phylogeographic analyses are however available. Here we address the hypotheses that the sub-Saharan African sweet vernal grasses have a dual col...
Article
A recent trend in conservation biology is not only to focus on protected areas of natural vegetation but also on the management of agricultural landscapes, since these landscapes are considered to be of vital importance for overall landscape biodiversity − both through the opportunity for species to thrive there and as conduits for inter-patch disp...
Article
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Effective conservation of biodiversity in patches of (semi-) natural vegetation is dependent on an understanding of the influence of management as well as spatial and temporal factors. In southwestern Ethiopia coffee generally grown under a rather dense layer of indigenous trees (so called semi-forest coffee - SFC) often in patches embedded in an o...
Article
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The expansion of pollinator-dependent crops, especially in the developing world, together with reports of worldwide pollinator declines, raises concern of possible yield gaps. Farmers directly reliant on pollination services for food supply often live in regions where our knowledge of pollination services is poor. In a manipulative experiment repli...
Article
Full-text available
Human population expansion and associated degradation of the habitat of many wildlife species cause loss of biodiversity and species extinctions. The small Simen Mountains National Park in Ethiopia is one of the last strongholds for the preservation of a number of afro-alpine mammals, plants and birds, and it is home to the rare endemic Walia ibex,...
Data
Diet molecular operational taxonomic units (MOTUs) detected in the samples. Listed MOTUs were detected more than 10 times in at least one of the two herbivore species. Occurrence refers to the number of sequence reads from the faecal samples of each species. Frequency refers to the number of samples where the MOTUs were detected. (DOCX)
Data
Taxa included in the afro-alpine taxonomic trnL P6 loop reference library version 2.0. Specimen O-DP-30529 ET-0333-1 14.1 in reference library 1.0 [33] was removed as it had been misidentified. Nomenclature follows Flora of Ethiopia and Eritrea and Flora of Tropical East Africa and the APG III [72]. (DOCX)
Data
Individual-based rarefaction curves of diet item sequences retrieved from a) Walia ibex samples and b) domestic goat. (TIF)
Article
Full-text available
The flora on the isolated high African mountains or 'sky islands' is remarkable for its peculiar adaptations, local endemism and striking biogeographical connections to remote parts of the world. Ages of the plant lineages and the timing of their radiations have frequently been debated but remain contentious as there are few estimates based on expl...
Article
The naturally fragmented habitat on the tallest African mountains provides a good model system to study vicariance, dispersal, and hybridization. Many mountains are separated by lowland that likely was unsuitable for high-alpine plants even during cold climatic periods. We explore the relative importance of these processes using two endemic sister...
Article
The expansion of pollinator-dependent crops, especially in the developing world, together with reports of worldwide pollinator declines, raises concern of possible yield gaps. Farmers directly reliant on pollination services for food supply often live in regions where our knowledge of pollination services is poor. In a manipulative experiment repli...
Article
The expansion of pollinator-dependent crops, especially in the developing world, together with reports of worldwide pollinator declines, raises concern of possible yield gaps. Farmers directly reliant on pollination services for food supply often live in regions where our knowledge of pollination services is poor. In a manipulative experiment repli...
Article
Full-text available
Vast areas of forests in North-eastern Ethiopia have been replaced by cropland, shrub land or grazing areas. Thus, information about how vegetation composition and structure varies with disturbance is fundamental to conservation of such areas. This study aimed to investigate the effects of disturbance on the population structure and regeneration po...
Article
The major focus of ecological restorations has been on understanding local factors. However, landscape factors such as dispersal limitation of individuals or propagules across the surrounding matrix can also constrain the restoration progress. We investigated to what extent native woody species colonize and thrive in plantations, focusing on both t...