Grazing Impact on Biodiversity in Agricultural Landscapes

Grazing by both domestic and wild herbivores is a fundamental driver of biodiversity in agricultural landscapes, exerting multifaceted influences on vegetation structure, nutrient cycling and species interactions across trophic levels. By selectively removing biomass, grazers create a dynamic mosaic of swards and bare ground that can enhance plant species richness, promote habitat heterogeneity and facilitate niche differentiation among invertebrates, birds and small mammals. However, intensive or poorly timed grazing may lead to soil compaction, erosion and the loss of specialised or rare taxa. The net effect of grazing depends on stocking density, grazer diversity, temporal patterns of use and the underlying soil and climatic conditions. In temperate regions, rotational grazing and rest periods can boost floral diversity and support pollinators, whereas in arid and semi-arid systems moderate grazing can maintain savannah configurations and prevent woody encroachment. Global research highlights the importance of context-specific management to balance agricultural productivity with conservation goals, informing policy instruments such as agri-environment schemes and biodiversity-friendly certification standards.

Research from Nature Portfolio

Recent work has demonstrated that arboreal mammals such as the common brushtail possum exhibit habitat-dependent responses to livestock grazing, tolerating heavy grazing in structurally intact woodlands while avoiding areas where understorey cover is depleted and tree species richness reduced. This study underscores the importance of vertical and horizontal vegetation complexity in mediating grazer effects on wildlife and suggests that adaptive grazing strategies should account for microhabitat attributes to maintain connectivity and resource availability for non-target fauna.

Grazing Impact on Biodiversity in Agricultural Landscapes publication trend

The graph below shows the total number of articles in grazing impact on biodiversity in agricultural landscapes across all publications each year (not limited to Nature Index journals).

Technical terms

Carrying capacity: The maximum stocking rate that a habitat can support without degradation.

Rotational grazing: A management system moving livestock among paddocks to allow vegetation recovery.

Trophic cascade: Indirect ecological effects that predators or grazers have on lower trophic levels.

Habitat heterogeneity: The variety and complexity of physical and biological features within a landscape.

Matrix tolerance: A species’ ability to survive and move through non-preferred habitat between patches.

Stocking density: The number of grazing animals per unit area over a given time period.

References

1. A global inventory of animal diversity measured in different grazing treatments. Scientific Data (2022).
2. Reptiles and frogs conform to multiple conceptual landscape models in an agricultural landscape. Diversity and Distributions (2017).
3. Experimental evidence that livestock grazing intensity affects the activity of a generalist predator. Acta Oecologica (2013).
4. The response of an arboreal mammal to livestock grazing is habitat dependant. Scientific Reports (2017).