Unlocking Biodiversity Secrets: The Role of Sengis in South African Shrublands

South Africa's shrublands, encompassing biomes like the Succulent Karoo and Kalahari, are biodiversity hotspots facing significant pressures from climate change, aridification, and habitat fragmentation. These arid to semi-arid ecosystems support unique flora and fauna, but recent assessments reveal troubling declines. Sub-Saharan Africa, including South African shrublands, has lost approximately 24% of its pre-industrial biodiversity in terms of faunal and floral population abundances. Small mammals, particularly sengis (elephant-shrews, family Macroscelididae), act as sensitive bioindicators, responding swiftly to environmental shifts before larger species or vegetation show signs of distress.

Sengis are small, insectivorous mammals with long, flexible snouts adapted for foraging ants, termites, and seeds. Native to Africa, 12 of the 19 global species inhabit southern Africa, thriving in diverse habitats from deserts to shrublands. Their elusive nature and cryptic morphologies have historically hindered monitoring efforts, but a groundbreaking study published in January 2026 introduces Footprint Identification Technology (FIT) to track them non-invasively.

What Are Sengis? Understanding These Elusive Bioindicators

Sengis, scientifically classified under the order Macroscelidea and superorder Afrotheria, resemble a cross between mice, shrews, and anteaters due to their elongated proboscis and large eyes. Weighing around 60 grams, species like the Eastern Rock sengi (Elephantulus myurus) prefer rocky outcrops in grasslands and shrublands, while the Bushveld sengi (Elephantulus intufi) favors sandy bushveld environments. Despite overlapping ranges, these cryptic species—nearly indistinguishable by eye—occupy distinct microhabitats, playing unique roles in seed dispersal, insect control, and as prey for predators.

In South African shrublands, sengis contribute to ecosystem stability by aerating soil through foraging and indicating habitat quality. Population shifts signal disturbances like overgrazing or drought, making them ideal for long-term monitoring. Traditional identification relies on trapping, which stresses animals and yields low capture rates for these wary creatures.

The Biodiversity Crisis in South African Shrublands

South Africa's shrublands, part of the Cape Floristic Region and Karoo biomes, host over 9,000 plant species, many endemic. However, shrubland biomes have experienced biodiversity decline since pre-industrial times due to agriculture, invasive species, and climate variability. Recent data from 2025 studies confirm sub-Saharan losses averaging 24%, with large mammals like elephants declining more sharply than resilient plants.

Threats include aridification, projected to intensify by 2030, fragmenting habitats and stressing small mammal populations. Accurate monitoring is crucial for adaptive management, yet cryptic species like sengis challenge conventional camera traps or eDNA sampling, which are costly and sporadic.

Challenges in Monitoring Cryptic Small Mammals

Cryptic species, morphologically similar but ecologically distinct, confound field identification. For E. myurus and E. intufi, subtle differences in pelage and dimensions require genetic verification, limiting scalable surveys. Trapping inflicts stress, with morbidity rates up to 10% in small mammals. IUCN and GBIF distribution maps often mismatch field data, as seen at Tswalu Kalahari Reserve where E. myurus appeared outside expected ranges.

• Labor-intensive: Traps yield few captures in low-density populations.
• Invasive: Handling increases mortality risk.
• Costly: Genetics and cameras demand expertise and funding.
• Biased: Misses nocturnal or trap-shy individuals.

These gaps hinder biodiversity assessments essential for conservation policy.

Footprint Identification Technology (FIT): A Game-Changer

FIT, pioneered by WildTrack Inc., digitizes footprints for species ID using image processing, morphometrics, and machine learning. For sengis, researchers adapted the Small Mammal Reference Track (SMaRT) box—a portable wooden enclosure (55x27x17.5 cm) with charcoal-dusted ends and adhesive paper.

Step-by-step process:

1. Capture sengis humanely in PVC traps baited with peanut butter, oats, and Marmite.
2. Transfer to SMaRT box; animal walks over charcoal, leaving prints on paper.
3. Photograph prints through perspex roof at consistent scale.
4. Analyze in JMP software: Extract 77 distances, 14 angles, 8 areas from landmarks.
5. Apply Linear Discriminant Analysis (LDA) on top 9 variables for classification.

This yields 94-96% accuracy from a single front footprint, far surpassing visual methods.

The Landmark Sengi Study: Methods and Findings

Conducted at Telperion Nature Reserve (Mpumalanga/Gauteng; 570-730 mm rainfall, rocky grasslands) and Tswalu Kalahari Reserve (Northern Cape; 360 mm rainfall, sandy shrublands), the study analyzed 227 front footprints from 37 individuals (19 E. myurus, 18 E. intufi; balanced sexes).

Key results:

• Training accuracy: 94.8%; validation: 95.6%; cross-validation: 94-95% over 10 folds.
• Variable V7 (medial toe to carpal pad distance) alone: 99.9% accuracy.
• Unexpected E. myurus at Tswalu suggests range overlap amid climate shifts.

Genetic verification confirmed IDs, validating FIT.Read the full study

Spotlight on South African Universities Driving Innovation

The study showcases collaboration among South African institutions. Dr. Maria Oosthuizen from the University of Pretoria's Mammal Research Institute led fieldwork, leveraging UP's expertise in wildlife ecology. Prof. Nico Avenant from the University of the Free State's Center for Environmental Management contributed mammalogy insights. International partners like Duke University enhanced tech development.

SA universities play pivotal roles in biodiversity research, training postdocs and research assistants amid growing demand. Opportunities abound in research assistant jobs focused on non-invasive monitoring.

Implications for Ecosystem Health Monitoring

Sengis as bioindicators enable early detection of shrubland degradation. FIT provides scalable data for population trends, distribution shifts, and habitat suitability modeling. Dr. Zoë Jewell notes, "Small mammals offer a reliable metric for ecosystem integrity." In shrublands, tracking cryptic sengis reveals microhabitat responses to drought, informing restoration.

Benefits include:

• Cost-effective: Uses local materials.
• Ethical: Zero handling post-capture.
• Community-driven: Integrates indigenous knowledge.
• Global applicability: Adaptable to other biomes.

Future Applications and Research Frontiers

Researchers plan open-ended tunnels for trap-shy sengis and deep learning for multi-species ID. Integrating FIT with camera traps and eDNA could revolutionize monitoring. In SA, universities like UP are expanding programs; aspiring ecologists can pursue academic CV tips for research roles.

Timeline: 2026 pilots in Karoo shrublands; 2030 widespread adoption via SANBI networks.

Careers in Biodiversity Research: Opportunities in South Africa

This study highlights demand for experts in mammal ecology. South African university jobs in research proliferate, from postdoc positions to lecturer roles. Platforms like AcademicJobs.com/higher-ed-jobs list openings at UP and UFS. Share professor insights on Rate My Professor.

Photo by Jonathan Teff on Unsplash

Conclusion: Paving the Way for Healthier Shrubland Ecosystems

The sengi FIT study exemplifies innovative, university-led research combating biodiversity loss. By enabling precise tracking, it empowers conservation in South Africa's vulnerable shrublands. Explore higher ed jobs, career advice, rate professors, and university jobs to join this vital field.