Research Articles (Zoology and Entomology)

Permanent URI for this collectionhttp://hdl.handle.net/2263/1740

A collection containing some of the full text peer-reviewed/ refereed articles published by researchers from
the Department of Zoology and Entomology

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Vectorial drivers of malaria transmission in Jabi Tehnan district, Amhara Regional State, Ethiopia
(Nature Research, 2024-06-13) Belay, Aklilu; Asale, Abebe; Sole, Catherine L.; Kinya, Fiona; Yusuf, Abdullahi Ahmed; Torto, Baldwyn; Mutero, Clifford Maina; Tchouassi, David P.
Among the factors affecting the effectiveness of malaria control is poor knowledge of the entomologic drivers of the disease. We investigated anopheline populations as part of a baseline study to implement house screening of windows and doors as a supplementary malaria control tool towards elimination in Jabi Tehnan district, Amhara Regional State of Ethiopia. The samples were surveyed monthly using CDC light traps between June 2020 and May 2021. Mosquito trap density (< 3 mosquitoes/trap) was low, however, with a high overall Plasmodium sporozoite rate (9%; indoor = 4.3%, outdoor = 13.1%) comprising P. falciparum (88.9%) and P. vivax (11.1%). Anopheles gambiae s.l., mostly An. arabiensis, comprised > 80% of total anopheline captures and contributed ~ 42% of Plasmodium-infected mosquitoes. On the other hand, morphologically scored Anopheles funestus s.l., constituting about 6% of anopheline collections, accounted for 50% of sporozoite-infected mosquitoes. Most of the infected An. funestus s.l. specimens (86.7%) were grouped with previously unknown or undescribed Anopheles species previously implicated as a cryptic malaria vector in the western Kenyan highlands, confirming its wider geographic distribution in eastern Africa. Other species with Plasmodium infection included An. longipalpis C, An. theileri, An. demillioni, and An. nili. Cumulatively, 77.8% of the infected mosquitoes occurred outdoors. These results suggest efficient malaria parasite transmission despite the low vector densities, which has implications for effective endpoint indicators to monitor malaria control progress. Additionally, the largely outdoor infection and discovery of previously unknown and cryptic vectors suggest an increased risk of residual malaria transmission and, thus, a constraint on effective malaria prevention and control.
The global atlas of edible insects : analysis of diversity and commonality contributing to food systems and sustainability
(Nature Research, 2024-02-29) Omuse, Evanson R.; Tonnang, Henri E.Z.; Yusuf, Abdullahi Ahmed; Machekano, Honest; Egonyu , James Peter; Kimathi , Emily; Mohamed, Samira Faris; Kassie , Menale; Subramanian , Sevgan; Onditi , Juliet; Mwangi , Serah; Ekesi , Sunday; Niassy, Saliou
The future of the food system on the planet is increasingly facing uncertainties that are attributable to population growth and a surge in demand for nutritious food. Traditional agricultural practices are poised to place strain on production, as well as natural resources and ecosystem services provided, particularly under a changing climate. Given their remarkable attributes, including a low environmental footprint, high food conversion ratio, rapid growth and nutritional values, edible insects can play a vital role in the global food system. Nonetheless, substantial knowledge gaps persist regarding their diversity, global distribution, and shared characteristics across regions, potentially impeding effective scaling and access to edible insects. Therefore, we compiled and analysed the fragmented database on edible insects and identified potential drivers that elucidate insect consumption, globally, focusing on promoting a sustainable food system. We collated data from various sources, including the literature for a list of edible insect species, the Global Biodiversity Information Facility and iNaturalist for the geographical presence of edible insects, the Copernicus Land Service library for Global Land Cover, and FAOSTAT for population, income, and nutritional security parameters. Subsequently, we performed a series of analytics at the country, regional and continental levels. Our study identifies 2205 insect species, consumed across 128 countries globally. Among continents, Asia has the highest number of edible insects (932 species), followed by North America (mainly Mexico) and Africa. The countries with the highest consumption of insects are Mexico (450 species), Thailand (272 species), India (262 species), DRC (255 species), China (235 species), Brazil (140 species), Japan (123 species), and Cameroon (100 species). Our study also revealed some common and specific practices related to edible insect access and utilisation among countries and regions. Although insect consumption is often rooted in cultural practices, it exhibits correlations with land cover, the geographical presence of potentially edible insects, the size of a country’s population, and income levels. The practice of eating insects is linked to the culture of people in Africa, Asia, and Latin America, while increased consciousness and the need for food sustainability are driving most of the European countries to evaluate eating insects. Therefore, edible insects are becoming an increasingly significant part of the future of planetary food systems. Therefore, more proactive efforts are required to promote them for their effective contribution to achieving sustainable food production.
The contribution of commonly consumed edible insects to nutrition security in the Eastern D.R. Congo
(Nature Research, 2024-07-13) Ishara , Jackson; Matendo , Rehema; Ng’ang’a , Jeremiah; Siddiqui, Shahida Anusha; Niassy, Saliou; Katcho, Karume; Kinyuru, John
Edible insects are perceived as an incredible opportunity to mitigate the major challenge of sustainably producing healthy foods for a growing world population in the face of climate change uncertainties over the coming decade. In this study, we assessed the nutrient composition and sensory properties of Acheta domesticus, Apis mellifera, Gnathocera trivittata, Gryllotalpa africana, Imbrasia epimethea, Imbrasia oyemensis, Locusta migratoria, Macrotermes subhylanus, Nomadacris septemfasciata, Rhyncophorus phoenicis, Ruspolia differens and Rhynchophorus ferrugineus consumed in Eastern D. R. Congo. The investigated edible insects are highly appreciated and nutritious, with proteins (20.67-43.93 g/100 g) and fats (14.53-36.02 g/100 g) being the major macro-nutrients, proving their potential to improve diets through food enrichment. The high potassium (24-386.67 mg/100 g), sodium (152-257.82 mg/100 g), magnesium (32-64 mg/100 g), iron (5.3-16.13 mg/100 g), calcium (25-156.67 mg/100 g) and zinc (11-19.67 mg/100 g) content make the assessed edible insects a useful mineral-containing ingredient for preventing undernutrition in countries which are plagued by micronutrient deficiencies. A scatter plot of matrices and Pearson's correlations between sensory attributes and nutritional composition showed a negative correlation (r = - 0.45) between protein and appearance. While no strong correlation was observed between nutritional attributes and sensory acceptance, a positive correlation was observed between potassium and aroma (r = 0.50), after-taste (r = 0.50) and acceptability (r = 0.52). Principal component analysis results indicated that the two axes accounted for up to 97.4% of the observed variability in the nutrient composition and sensory attributes of commonly consumed edible insects in the Eastern D. R. Congo. Given the significant delicacy and nutritional potential of edible insects highlighted in this paper, households can rely on the latter to meet their nutritional needs rather than conventional livestock, thus contributing to environmental and financial security through local business opportunities.
Pheromonal variation and mating between two mitotypes of fall armyworm (Spodoptera frugiperda) in Africa
(Nature Research, 2024) Sisay, Birhanu; Tamiru, Amanuel; Subramanian, Sevgan; Weldon, Christopher William; Khamis, Fathiya; Green, Kristina Karlsson; Anderson, Peter; Torto, Baldwyn
In the Americas, the fall armyworm (Spodoptera frugiperda) exists in two genetically distinct strains, the corn (C) and rice (R) strains. Despite their names, these strains are not associated with host plant preferences but have been shown to vary in pheromone composition and male responses. Recently, S. frugiperda was detected in Africa as an invasive species, but knowledge about variation in strain types, pheromone composition and inter-strain mating of populations of the pest in the continent has not been fully examined. Therefore, this study aimed to investigate variations, if any in the pheromone composition of female moths, male moth responses, and mating between C and R mitotypes of S. frugiperda populations in Kenya, as well as their geographic distribution. Strains (mitotypes) of S. frugiperda were identified using mitochondrial DNA (mtDNA) markers, and their pheromonal composition determined by coupled gas chromatography-mass spectrometric (GC-MS) analysis. Male moth responses to these compounds were evaluated using GC-electroantennographic detection (EAD), electroantennogram (EAG), and wind tunnel assays. Oviposition assays were used to determine whether R and C mitotype moths could mate and produce eggs. The results showed that both the R and C mitotypes were present, and there were no statistically significant differences in their distribution across all sampled locations. Five pheromone compounds including (Z)-7-dodecenyl acetate (Z7-12:OAc), (Z)-7-tetradecenyl acetate (Z7-14:OAc), (Z)-9-tetradecenyl acetate (Z9-14:OAc), (Z)-11-tetradecenyl acetate (Z11-14:OAc) and (Z)-11-hexadecenyl acetate (Z11-16:OAc), were detected in the pheromone glands of female moths of both mitotypes, with Z9-14:OAc being the most abundant. The relative percentage composition of Z9-14:OAc was similar in both mitotypes. However, the R mitotype had a 2.7 times higher relative percentage composition of Z7-12:OAc compared to the C mitotype moth, while the C mitotype moth had a 2.4 times higher relative percentage composition of Z11-16:OAc than the R mitotype moth. Male moths of both mitotypes exhibited similar responses to the pheromone compounds, showing the strongest responses to Z9-14:OAc and Z7-12:OAc in electrophysiological and behavioural assays. There was mating between R and C mitotypes with egg production comparable to mating within the same mitotype. Our results revealed that differences between the two S. frugiperda mitotypes are characterized by female moth pheromone composition rather than male moth responses to the pheromones, and that this does not prevent hybridisation between the mitotypes, which may have implications for their management.
O (des)conhecimento da biodiversidade : uma sistematizacao sobre lacunas, limitaçoes, vieses, deficits e ruidos
(Universidade Federal do Rio de Janeiro, 2024-09) Castro-Souza, Rodrigo Antonio; Tessarolo, Geiziane; Bosco, Nicolas Silva; De Carvalho Santos, Andréia; Kempner, Afonso; Marques, Thairik Mateus Silva; Da Costa-Silva, Vinicius; Diniz-Filho, Jose Alexandre F.; Sobral-Souza, Thadeu
PORTUGUêS : A partir dos avanços das ferramentas de bioinformática e ecoinformática tornou-se viável usar grandes quantidades de informação sobre biodiversidade para descrever padrões biológicos e tentar avaliar os processos ecológicos e evolutivos subjacentes a eles, bem como estabelecer ações mais efetivas e abrangentes para conservá-la. Contudo, as informações existentes acerca da biodiversidade ainda são incompletas, possuindo lacunas, limitações, vieses, décits e ruídos. Neste sentido, reconhecemos a necessidade de disc utir problemática s relacionadas ao uso dos g randes bancos de dados de biodiversidade e a sua qualidade, discussões estas que precisam ser conceitualizadas de forma mais estruturada. Neste texto, iremos descrever de forma sistematizada as lacunas, limitações, e vieses do conhecimento da biodiversidade, problemas que estão diretamente associados à obtenção de informações das espécies na natureza. Em seguida, delimitaremos os tipos de décits e ruídos, que são problemas associados aos bancos de dados da biodiversidade. Isso se deve ao fato de que as informações presentes nos registros primários e nos grandes bancos de dados frequentemente são usadas de forma inadequada. Além disso, apontamos também perspectivas sobre como abordar essas deciências em trabalhos ecológicos/biogeográcos, por meio de uma adequada curadoria dos bancos de dados e da construção de mapas de ignorância. Por m, destacamos desaos futuros, como a necessidade de novas coletas de dados, a formação de novos taxonomistas e o fornecimento de subsídios nanceiros para a infraestrutura e a digitalização das coleções biológicas.
The road to a long lifespan in the Persian squirrel, a natural model for extended longevity : resisting free radical stress and healthy phospholipids
(Springer, 2025) Salehi, Fahimeh; Kavoosi, Gholamreza; Jacobs, Paul Juan; Bennett, Nigel Charles; Ahmadian, Shahin; Bastani, Babak; Gholami, Mahdi
Longevity is influenced by various factors, including fatty acid composition and free radical stress, which relate to the membrane pacemaker and rate of living hypotheses. While these aspects are well-documented in some long-lived species, they remain largely unexplored in tree squirrels. This study aimed to compare oxidative stress, antioxidant activity, nitrosative stress, and lipid composition between the long-lived Persian squirrel (Sciurus anomalus) and the short-lived Wistar rat across age cohorts (younger and older). Tissue homogenates from skin, liver, skeletal muscle, spleen, lung, and kidney were analysed for lipid composition (monounsaturated fatty acids (MUFA), polyunsaturated fatty acids (PUFA), arachidonic to linoleic acid ratio, peroxidation index, and unsaturation index. Oxidative, nitrosative, and antioxidant markers were assessed, including NADPH oxidase, superoxide dismutase, catalase, glutathione peroxidase, glutathione S-transferase (GST), nitric oxide synthase, superoxide, hydrogen peroxide, nitric oxide, malondialdehyde, 4-hydroxynonenal, and total antioxidant capacity (TAC). Squirrels demonstrated higher GST activity, lower free radical stress, lower PUFA, and higher MUFA compared to rats. Antioxidant activities, except for TAC were negatively correlated with longevity. Older squirrels exhibited similar oxidative, nitrosative, and antioxidant profiles to younger squirrels, whereas younger rats displayed highly susceptible fatty acids, similar to older rats. The Persian squirrel’s longevity appears closely linked to fatty acid composition and free radical resistance, likely due to increased GST activity. We propose GST’s multifunctional role in reducing inflammation, enhancing immune response, providing disease resistance, and antioxidant activity contributes significantly to the longevity of the Persian squirrel.
Can African elephants use leaf colour as a visual cue when making foraging decisions?
(Springer, 2025-06) Peinke, Claire Louise; Shrader, A.M. (Adrian)
Finding food is one of the most important aspects of an animal’s life. Yet, locating it can be challenging as the availability and quality of food varies both spatially and temporarily. To overcome these challenges, mammalian herbivores may use spatial memory or senses such as smell and vision. Recent studies have found that African elephants (Loxodonta africana) use olfactory cues to locate food patches and to select plants to eat within these patches. However, the extent to which they may also use visual cues, such as those associated with leaf colour, a proxy for food quality, when making foraging decisions is unknown. To address this knowledge gap, we tested whether African elephants were able to discriminate differences in leaf colour (i.e., light green: high-quality new growth, dark green: lower quality old growth, brown: poor-quality senesced vegetation) over a range of distances (i.e., 3, 5, 10, 20, 40, 80 m). Testing four semi-tame elephants using visual-based choice experiments between different coloured canvases, we found that the elephants were able to discriminate colour differences at close range (i.e., ≤10 m), but not beyond. This suggests that when feeding within a patch, African elephants may utilise the visual cues associated with leaf colour to help locate high-quality food (e.g., individual trees, branches, and leaves) and thus increase their foraging efficiency. However, as they were unable to discriminate between the different colours over distances > 10 m, it is unlikely that they use colour when making long-range foraging decisions such as selecting feeding patches.
Where data science and the disciplines meet : innovations in linking doctoral students with masters-level data science education
(Massachusetts Institute of Technology Press, 2024-08-21) Preiss, Doreet; Sperling, Jessica; Huang, Ryan M.; Bradbury, Kyle; Nechyba, Thomas; Calderbank, Robert; Herschlag, Gregory; Borg, Jana Schaich
Although the need for data science methodological training is widely recognized across many disciplines, data science training is often absent from PhD programs. At the same time, master’s-level data science educationa programs have seen incredible growth and investment. In 2018, Duke University initiated a National Science Foundation (NSF)-funded program to determine whether master’s-level data science programs that universities have already invested in could be leveraged to reduce data science education barriers doctoral students face. Doctoral fellows from diverse fields worked with teams of master’s students from Duke’s Master in Interdisciplinary Data Science program on applied capstone projects focused on the doctoral fellows’ own disciplines and dissertation research. Fellows also gained access to the master’s program’s courses and professional development resources. We examined the implementation, experience, and effect of this integration into Master in Data Science program infrastructure using qualitative data collection with doctoral fellows, master’s students, and fellows’ doctoral advisors. Master’s students participating in doctoral-led capstones benefited from their doctoral fellows’ mentorship, project management, and content knowledge. Participating doctoral students showed increased learning of data science techniques and professional skills development. While some fellows’ research was advanced through the capstones, data also showed mismatches between selected master’s program goals and doctoral students’ needs. Overall, this pilot indicated potential promise in harnessing existing Master in Data Science programs to bolster doctoral students’ data science learning and professional readiness while also identifying areas for improving future such efforts.
Conflation of reforestation with restoration is widespread : across Africa, vast areas of nonforest are threatened by inappropriate restoration in the form of tree planting
(American Association for the Advancement of Science, 2024-02-16) Parr, Catherine Lucy; Te Beest, Mariska; Stevens, Nicola
No abstract available.
Uncovering cryptic species diversity of Ophiocordyceps (Ophiocordycipitaceae) associated with Coleoptera from Thailand
(Westerdijk Fungal Biodiversity Institute, 2024-12) Mongkolsamrit, S.; Noisripoom, W.; Tasanathai, K.; Khonsanit, A.; Thanakitpipattana, D.; Lamlertthon, S.; Himaman, W.; Crous, Pedro W.; Stadler, M.; Luangsa-ard, J.J.
This study advances our understanding of Ophiocordyceps, an extensively studied entomopathogenic fungus within the Ophiocordycipitaceae, particularly in Thailand. We introduce seven novel species associated with Coleoptera - O. albostroma, O. brunnea, O. capilliformis, O. kohchangensis, O. phitsanulokensis, O. pseudovariabilis, and O. ratchaburiensis. Remarkably, O. brunnea, O. kohchangensis, and O. ratchaburiensis exhibit ascomata on the subterminal region of the stromata, with the asexual form appearing at the apex of the stipe, reminiscent of O. brunneipunctata. In contrast, O. phitsanulokensis produces its ascomata in the upper region of the stipe. Shared traits include immersed perithecia and part-spores production. Ophiocordyceps albostroma and O. pseudovariabilis produce pseudo-immersed perithecia, with the former producing ascospores breaking into four part-spores, and the latter displaying 32 part-spores. Ophiocordyceps capilliformis is also introduced due to morphological distinctions from closely related species. Phylogenetic analyses based on multigene loci (LSU, TEF1, RPB1, RPB2) robustly confirm the placement of these new species within Ophiocordyceps. Additionally, we report a new record of O. clavata in Thailand.
Announcing the invasions newsletter
(Springer, 2025-06) Novoa, Ana; Canavan, Susan; Faulkner, Katelyn T.; Genovesi, Piero; Lieurance, Deah; Simberloff, Dan; Wang, Hsiao-Hsuan; Zengeya, Tsungai; Meyerson, Laura A.
No abstract available.
In vitro antiplasmodial activity and cytotoxicity of three Ziziphus (Rhamnaceae) species from South Africa
(Elsevier, 2025-06) Mabuza, Mcebisi Junior; Kaiser, M.; Tshikalange, T.E.; Yusuf, Abdullahi Ahmed; Bapela, Mahwahwatse Johanna
Please read abstract in the article.
Extreme herding behavior in adult male sub-Antarctic fur seals
(Springer, 2025-05) Bester, Marthan Nieuwoudt; Rossouw, G.J.; mnbester@zoology.up.ac.za
We re-analyzed unpublished data on herding behavior in adult male sub-Antarctic fur seals Arctocephalus tropicalis recorded at Gough Island during the 1975/76 austral summer breeding season. The results extend the study of competition and injury in adult males from the same population. Herding behavior is defined and shows that adult males in this population exhibit the most extreme herding behavior of the fur seal genus Arctocephalus. Extreme herding responses result from both human disturbance and in natural settings without human disturbance. Such information is needed for comparative studies about aggression and territorial behavior in otariids.
Maize edible‑legumes intercropping systems for enhancing agrobiodiversity and belowground ecosystem services
(Nature Research, 2024-06-21) Jalloh, Abdul A.; Mutyambai, Daniel Munyao; Yusuf, Abdullahi Ahmed; Subramanian, Sevgan; Khamis, Fathiya
Intensification of staple crops through conventional agricultural practices with chemical synthetic inputs has yielded positive outcomes in food security but with negative environmental impacts. Ecological intensification using cropping systems such as maize edible-legume intercropping (MLI) systems has the potential to enhance soil health, agrobiodiversity and significantly influence crop productivity. However, mechanisms underlying enhancement of biological soil health have not been well studied. This study investigated the shifts in rhizospheric soil and maize-root microbiomes and associated soil physico-chemical parameters in MLI systems of smallholder farms in comparison to maize-monoculture cropping systems (MMC). Maize-root and rhizospheric soil samples were collected from twenty-five farms each conditioned by MLI and MMC systems in eastern Kenya. Soil characteristics were assessed using Black oxidation and Walkley methods. High-throughput amplicon sequencing was employed to analyze fungal and bacterial communities, predicting their functional roles and diversity. The different MLI systems significantly impacted soil and maize-root microbial communities, resulting in distinct microbe sets. Specific fungal and bacterial genera and species were mainly influenced and enriched in the MLI systems (e.g., Bionectria solani, Sarocladium zeae, Fusarium algeriense, and Acremonium persicinum for fungi, and Bradyrhizobium elkanii, Enterobacter roggenkampii, Pantoea dispersa and Mitsuaria chitosanitabida for bacteria), which contribute to nutrient solubilization, decomposition, carbon utilization, plant protection, bio-insecticides/fertilizer production, and nitrogen fixation. Conversely, the MMC systems enriched phytopathogenic microbial species like Sphingomonas leidyi and Alternaria argroxiphii. Each MLI system exhibited a unique composition of fungal and bacterial communities that shape belowground biodiversity, notably affecting soil attributes, plant well-being, disease control, and agroecological services. Indeed, soil physico-chemical properties, including pH, nitrogen, organic carbon, phosphorus, and potassium were enriched in MLI compared to MMC cropping systems. Thus, diversification of agroecosystems with MLI systems enhances soil properties and shifts rhizosphere and maize-root microbiome in favor of ecologically important microbial communities.
Insights into malaria vectors-plant interaction in a dryland ecosystem
(Nature Research, 2024-09-04) Kinya , Fiona; Milugo, Trizah K.; Mutero , Clifford M.; Wondji, Charles S.; Torto, Baldwyn; Tchouassi, David P.
Improved understanding of mosquito–plant feeding interactions can reveal insights into the ecological dynamics of pathogen transmission. In wild malaria vectors Anopheles gambiae s.l. and An. funestus group surveyed in selected dryland ecosystems of Kenya, we found a low level of plant feeding (2.8%) using biochemical cold anthrone test but uncovered 14-fold (41%) higher rate via DNA barcoding targeting the chloroplast rbcL gene. Plasmodium falciparum positivity was associated with either reduced or increased total sugar levels and varied by mosquito species. Gut analysis revealed the mosquitoes to frequently feed on acacia plants (~ 89%) (mainly Vachellia tortilis) in the family Fabaceae. Chemical analysis revealed 1-octen-3-ol (29.9%) as the dominant mosquito attractant, and the sugars glucose, sucrose, fructose, talose and inositol enriched in the vegetative parts, of acacia plants. Nutritional analysis of An. longipalpis C with high plant feeding rates detected fewer sugars (glucose, talose, fructose) compared to acacia plants. These results demonstrate (i) the sensitivity of DNA barcoding to detect plant feeding in malaria vectors, (ii) Plasmodium infection status affects energetic reserves of wild anopheline vectors and (iii) nutrient content and olfactory cues likely represent potent correlates of acacia preferred as a host plant by diverse malaria vectors. The results have relevance in the development of odor-bait control strategies including attractive targeted sugar-baits.
Influence of season, sex, and interspecific interactions on the diel activity patterns of two sympatric African small carnivores
(Nature Research, 2024-11-29) Carvalho, Filipe; Galantinho, Ana; Somers, Michael J.; Do Linh San, Emmanuel
Animal activity patterns vary seasonally and between species, facilitating species coexistence. In Africa, however, factors affecting the activity of many small carnivores remain poorly understood, especially for congeneric and sympatric species whose similar sizes may lead to interspecific competition. Here, we investigated differences and variations in the activity patterns of two sympatric Viverridae species in a seasonal African landscape. We continuously radio-tracked 15 small-spotted genets (Genetta genetta) and five Cape genets (G. tigrina) over 24-h cycles throughout the year. We analysed the effects of season, sex, and interspecific interactions on circadian rhythms using multi-cosinor regression models. Both species maintained a nocturnal activity pattern year-round, decreasing activity significantly during the cold-dry season. This pattern aligns with the thermoregulatory hypothesis—especially for species with an elongated body like genets—suggesting decreased activity under extreme cold weather conditions to conserve energy. Females in both species were less active than males, possibly due to their smaller home ranges, especially during the cold-dry season. These effects were particularly pronounced in Cape genets, which primarily inhabit riverine forests. Female Cape genets adjusted their activity onset, possibly to minimize encounters with males, mostly during the hot-wet season when caring for their offspring. Small-spotted genets shifted their activity onset and peak in riverine forests—areas of potential contact with Cape genets—compared to areas without Cape genets. Overall, our study underscores the critical role of seasonal environmental changes and interspecific interactions in shaping the activity patterns of two carnivore species within a semi-arid Albany Thicket landscape.
Assessment of domestic pig-bushpig (Potamochoerus larvatus) interactions through local knowledge in rural areas of Madagascar
(Nature Research, 2024-07-15) Rakotoarivony, Rianja; Kassie, Daouda; Andriamahefa, Alpha; Andria‑Mananjara , Diana; Rakotoarinoro , Mihaja; Ramaroson, Herilantonirina Solotiana; Raliniaina , Modestine; Rasamoelina , Miatrana; Gomez‑Vazquez, Jose Pablo; Jori, Ferran J.
In many parts of the world, domestic and wild animal populations interact at the interface between natural and agricultural ecosystems. Introduced with the first inhabitants arriving from eastern Africa, the bushpig (Potamochoerus larvatus) is the largest living terrestrial mammal in Madagascar. Bushpigs are regularly reported close to human settlements where they damage crops and gardens. As domestic pigs are often raised in free-ranging conditions around the villages, bushpigs and domestic pigs can interact leading to the transmission and circulation of shared swine pathogens that impact both animal and human health. In this study, we characterized the socio-ecological context of bushpig-domestic pig interactions in two different regions of western Madagascar. We conducted participatory mapping sessions and focus group interviews with 65 hunters, 80 pig farmers and 96 crop farmers in 20 fokontany, the smallest administrative unit in Madagascar. After discussing with participants, we gathered information about the spatialization of interactions and their potential geographical drivers. We explored data by performing multiple correspondence analysis and hierarchical clustering on principal components. Based on the reported occurrence or absence of bushpig-domestic pig interactions we were able to classify areas with high or intermediate levels of interactions or no interactions at all. Interactions between the two pig species were reported in only 25% of the fokontany assessed. Even though both suid species were attracted to fruit trees, crops, and water sources, only indirect interactions in those spots were reported. Direct interactions were reported in 10% of cases and referred to interspecific sexual and/or agonistic behavior. The participatory methods used to acquire local knowledge about natural events were confirmed as valuable, low-cost exploratory methods to characterize areas with wild-domestic animal interactions. The results of this study will help plan future studies to characterize the interface between the two species from an ecological or epidemiological perspective using more sensitive and sophisticated ecological approaches.
A biogeographical appraisal of the threatened South East Africa Montane Archipelago ecoregion
(Nature Research, 2024-03-12) Bayliss, Julian; Bittencourt‑Silva , Gabriela B.; Branch, William R.; Bruessow, Carl; Collins , Steve; Congdon , T. Colin E.; Conradie , Werner; Curran , Michael; Daniels, Savel R.; Darbyshire , Iain; Farooq , Harith; Fishpool , Lincoln; Grantham, Geoffrey; Magombo , Zacharia; Matimele , Hermenegildo; Monadjem, Ara; Monteiro, Jose; Osborne , Jo; Saunders , Justin; Smith , Paul; Spottiswoode , Claire N.; Taylor, Peter J.; Timberlake , Jonathan; Tolley , Krystal A.; Tovela , Erica; Platts, Philip J.
Recent biological surveys of ancient inselbergs in southern Malawi and northern Mozambique have led to the discovery and description of many species new to science, and overlapping centres of endemism across multiple taxa. Combining these endemic taxa with data on geology and climate, we propose the ‘South East Africa Montane Archipelago’ (SEAMA) as a distinct ecoregion of global biological importance. The ecoregion encompasses 30 granitic inselbergs reaching > 1000 m above sea level, hosting the largest (Mt Mabu) and smallest (Mt Lico) mid-elevation rainforests in southern Africa, as well as biologically unique montane grasslands. Endemic taxa include 127 plants, 45 vertebrates (amphibians, reptiles, birds, mammals) and 45 invertebrate species (butterflies, freshwater crabs), and two endemic genera of plants and reptiles. Existing dated phylogenies of endemic animal lineages suggests this endemism arose from divergence events coinciding with repeated isolation of these mountains from the pan-African forests, together with the mountains’ great age and relative climatic stability. Since 2000, the SEAMA has lost 18% of its primary humid forest cover (up to 43% in some sites)—one of the highest deforestation rates in Africa. Urgently rectifying this situation, while addressing the resource needs of local communities, is a global priority for biodiversity conservation.
Removal of organic biomass in Eucalyptus plantations has a greater impact on fungal than on bacterial networks
(Elsevier, 2025-06) Bose, Tanay; Vivas, Maria; Slippers, Bernard; Roux, Jolanda; Dovey, Steven; Kemler, Martin; Begerow, Dominik; Witfeld, Frederick; Brachmann, Andreas; Wingfield, Michael J.; Hammerbacher, Almuth; tanay.bose@fabi.up.ac.za
Complex and stable soil microbial networks are essential for productivity in plantation forestry, but their response to disturbances from harvesting and replanting is not well understood. This study assessed the impact of treatments designed to mitigate these disturbances on microbial biodiversity and networks in Eucalyptus plantation soils at three South African sites. We used high-throughput sequencing to catalogue fungal and bacterial biodiversity from 108 soil samples across three treatments: (i) retention of harvest residues (retained), (ii) removal of residues (removed), and (iii) removal of residues with added fertilizer (fertilized). Bioinformatic and statistical analyses of the sequence data revealed treatment-specific variations in microbial OTU richness, network structure and taxon associations at order-level. Microbiome richness was highest in ‘retained’ plots, and treatment-specific microbial diversity was evident in both fungal and bacterial communities. Network comparisons revealed that treatments to mitigate disturbances caused by harvesting significantly affected fungal networks but not bacterial networks. Fungal networks in ‘retained’ plots exhibited the highest complexity and stability compared to plots where the entire crop was removed. However, bacterial networks did not show significant differences in network structure among treatments. The associations between fungal and bacterial nodes were consistent in the three treatments, as indicated by similar Jaccard indices. However, distinct fungal hub nodes were found when comparing the 'retained' and 'removed' treatments. These findings highlight that retaining harvest residues enhances microbial richness and stabilizes fungal networks, making it a better strategy for managing soil disturbances than residue removal or fertilization.
The nutritional feed gap : seasonal variations in ruminant nutrition and knowledge gaps in relation to food security in Southern Africa
(Springer, 2025-02) Cooke, Andrew S.; Machekano, Honest; Gwiriri, Lovemore C.; Tinsley, Jonathan H.I.; Silva, Gleise M.; Nyamukondiwa, Casper; Safalaoh, Andrew; Morgan, Eric R.; Lee, Michael R.F.
Livestock production is critical to food security and rural livelihoods across Southern Africa. Despite progress in livestock science research in recent years, the seasonal availability and quality of feed remains one of the key challenges to livestock productivity in Southern Africa. In particular, dry weather conditions, the lack of rain and lower temperatures in the dry season cause herbaceous plants to die back and browse species to defoliate, limiting the abundance, quality, and variety of feed available. This creates a ‘Nutritional Feed Gap’, defined here as the combined effect of the sharp reduction in both forage quantity and quality from the wet to the dry season and the risk that it poses to ruminant production systems and the food security of the people and communities reliant on them. Understanding the nature and extent of how seasonality impacts ruminant production potential can thus contribute towards mitigating negative impacts of extreme weather and climate change on food systems. In this review, we characterise this nutritional feed gap in terms of forage abundance and nutrition as well as discussing how climate change may shape the future nutritional landscape. Whilst some forage nutrient concentrations varied little by season, crude protein and phosphorus were consistently found to decrease from the wet season to the dry season. We also identify a shortfall in primary research that assess both forage quality and quantity simultaneously, which forms part of a broader knowledge gap of our limited understanding of the impact of limiting factors to ruminant production on short and long-term food security across Southern Africa.

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