Spatial patterns and policy implications of invasive flora in the Horn of Africa.
Gebrehiwot K, Szymura M
Invasive Species
Invasive plants spreading along roadsides don't stay there — they hitchhike on vehicles, boots, and wind into the wildlands and farms beyond, and the same dynamics driving their spread in East Africa predict how they move through any landscape with roads cutting through it.
Researchers combed through scientific databases to map which invasive plants have taken hold across countries like Kenya, Ethiopia, and Somalia. They found that most invaders prefer lower altitudes and areas close to roads — roads act like highways for seeds. The plants most commonly show up on farmland and in scrubby shrublands, which means food production and native habitat are both under pressure.
Key Findings
250 invasive plant species from 63 families were recorded across the Horn of Africa, with the pea family (Fabaceae) accounting for 16.8% of species.
Invasive species declined significantly with increasing elevation and with greater distance from roads, confirming road networks as primary spread corridors.
Cultivated areas (33.5%) and shrublands (23.1%) had the highest invasion rates, while reporting quality was so inconsistent that true invasion extent is likely underestimated.
chevron_right Technical Summary
A regional survey across the Horn of Africa documented 250 invasive plant species, finding they cluster heavily near roads and low elevations, with cultivated lands and shrublands most affected. The study warns that inconsistent reporting standards likely mean the true invasion footprint is even larger than recorded.
Abstract Preview
Invasive plants are fast-spreading species that pose serious and often irreversible threats to native biodiversity. This study presents a regional-scale analysis of the elevational distribution of ...
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