Natural-history
The red-legged partridge in agricultural landscapes: mosaics, changes and limits of the evidence
The red-legged partridge uses open, varied environments, and sources describe threats associated with both agricultural intensification and abandonment. This relationship is documented as a description of habitat and threat factors, not as a measure of how much each change contributes to population size.
A species of open, varied environments
The red-legged partridge (Alectoris rufa) occupies a wide variety of open environments or areas with scattered trees: grasslands, farmland, open scrub and dehesas. SEO/BirdLife notes a preference for more diverse dryland agricultural landscapes. These data describe habitats used and preferred; on their own, they do not quantify the effect of a particular landscape on the population.
Different changes, related threats
Sources link habitat alteration to different processes: agricultural intensification, the abandonment of farmland or grassland—which can encourage scrub encroachment—and land-use changes such as conversion to irrigated agriculture or afforestation. The MITECO fact sheet also mentions the loss of field boundaries, landscape homogenisation and the use of plant-protection products. These are therefore not a single change or a uniform response: sources identify several factors associated with habitat alteration, but do not provide a comparable estimate of their relative contributions.
Why mosaic diversity matters
Among the proposed conservation measures, sources include maintaining fallow land, field boundaries and hedgerows, and promoting spatial heterogeneity through crop rotation. This places diverse elements of the agricultural landscape at the heart of recommendations for the species. However, the fact sheets consulted do not present experimental evidence that would make it possible to attribute a specific population effect to each element separately.
Habitat and game management are not the same
SEO/BirdLife and MITECO also identify inappropriate game management among the threats, with references to excessive hunting and restocking. This is a factor distinct from agricultural changes and should not be confused with them. The available sources describe both types of pressure, but do not make it possible to separate their respective contributions to population trends precisely.
What can be concluded
The evidence consulted supports a clear relationship between the red-legged partridge and open environments, especially diverse agricultural landscapes, and documents threats linked to changes resulting from both intensification and abandonment. It does not establish how much each change contributes to the status of a particular population. Nor is it appropriate to infer a current local trend from these general descriptions.
Sources
- Perdiz roja Alectoris rufa · Ministerio para la Transición Ecológica y el Reto Demográfico
- Perdiz roja · SEO/BirdLife