The wild boars (Sus scrofa) have become an increasingly numerous species in Spain and much of Europe, causing problems in agricultural and peri-urban areas, but also altering natural ecosystems of great ecological value.
A study conducted in the Czech Republic showed that the lands disturbed by wild boars are modifying the soil of forests included in the Natura 2000 network, posing a risk to the stability of these ecosystems.
The study in Hodonín: precise data on the impact
Between 2022 and 2023, a scientific team surveyed 976 hectares near the town of Hodonín and mapped 3,899 rooting areas — zones where the animals disturb the topsoil in search of food.
Each area was measured precisely, recording:
- Extent and depth of the disturbed land.
- Affected vegetation cover.
- Distance to watercourses.
- Proximity to artificial feeding points.
The results showed a clear pattern: the activity is concentrated around streams and feeders, decreasing as the distance to both increases.
More vulnerable ecosystems
The most affected areas are the mature masses of oaks and holm oaks, dominant species in these forests. The average depth of the disturbed land was 3 to 4 centimeters, enough to alter sensitive edaphic processes.
The study also revealed a change between the two sampling years: although the total disturbed area decreased from 10.93% to 7.95%, the alteration per individual increased.
The explanation lies in the lower production of acorns in the second year, following an exceptional previous harvest. As their main food source became scarce, the wild boars intensified their search for roots, bulbs, and invertebrates, disturbing more soil per head.
Wild boars as agents of ecological disturbance
Scientists warn that wild boars act as an agent of ecological disturbance:
- They modify the physical structure of the soil.
- They accelerate nutrient cycles.
- They facilitate the arrival of invasive species.
In fragile ecosystems like the sandy oak groves, the consequences include risk of water and wind erosion and difficulties for the natural regeneration of valuable species.
Intelligence and population expansion
Wild boars have demonstrated great adaptive intelligence and their population continues to grow. Therefore, some scientists propose reviewing:
- The population density.
- The feeding patterns.
- The location of artificial feeders.
In areas with fine soils or slopes, the localized damage can quickly escalate into irreversible degradation processes.
Proposed management measures
Among the urgent measures to curb the impact are:
- Adjusting population pressure through density control.
- Relocating or reducing the supply of artificial food.
- Installing temporary fences in areas of high ecological value to promote natural regeneration.
The population growth of wild boars in Europe poses an environmental and management challenge. Their ability to alter soils and fragile ecosystems requires urgent measures to prevent the impact from spreading on a large scale.
The study in the Czech Republic provides concrete evidence of how this species can affect up to one in every 10 hectares in a single season, becoming a problem that transcends agriculture and reaches biodiversity conservation.
