Guanaco Population Dynamics and Interactions in Patagonian Ecosystems

The guanaco (Lama guanicoe) is a keystone herbivore shaping the structure and function of Patagonian rangelands. Its population dynamics are governed by a complex interplay of abiotic factors, social organisation, predation risk and human land use. Seasonal migrations between winter refugia in valleys and summer pastures at higher elevations drive pronounced fluctuations in abundance and range occupancy. In addition, density-dependent processes and climate variables such as winter minimum temperatures influence rates of population growth and carrying capacity. Social units within the species exhibit divergent responses to ecological pressures: territorial family groups adjust their cohesion in response to predation risk and habitat openness, whereas non-territorial bachelor groups are more sensitive to local density. Human activities, notably sheep ranching and linear infrastructure, modify habitat connectivity, alter spatial segregation and may exacerbate competition for forage. The global significance of these dynamics extends to ecosystem services in analogous arid and semi-arid systems worldwide, while practical applications include optimising transboundary conservation strategies, designing wildlife-friendly infrastructure and integrating guanaco management into sustainable pastoral economies.

Research from Nature Portfolio

No recent Nature Portfolio content available.

Guanaco Population Dynamics and Interactions in Patagonian Ecosystems publication trend

The graph below shows the total number of articles in guanaco population dynamics and interactions in patagonian ecosystems across all publications each year (not limited to Nature Index journals).

Technical terms

Density surface model: A spatial statistical framework that estimates animal density continuously over a landscape by relating observed counts to environmental covariates.

Distance sampling: A survey method that infers population density by modelling the decline in detection probability with increasing distance from a transect or point.

Null model: An analytical approach generating randomised expectation patterns against which observed ecological data are compared to infer non-random processes.

Density dependence: Population regulation mechanism where birth and death rates change as a function of current population size.

Seasonal migration: Predictable, periodic movement of individuals between habitats that offer contrasting seasonal resources or refugia.

References

1. How Roads Affect the Spatial Use of the Guanaco in a South American Protected Area: Human Connectivity vs Animal Welfare. Diversity (2019).
2. Ecological Correlates of Group-Size Variation in a Resource-Defense Ungulate, the Sedentary Guanaco. PLOS ONE (2014).
3. Niche Segregation between Wild and Domestic Herbivores in Chilean Patagonia. PLOS ONE (2013).
4. Range Management Affects Native Ungulate Populations in Península Valdés, a World Natural Heritage. PLOS ONE (2013).
5. The effects of poaching and habitat structure on anti-predator behavioral strategies: A guanaco population in a high cold desert as case study. PLOS ONE (2017).
6. Spatial abundance models and seasonal distribution for guanaco (Lama guanicoe) in central Tierra del Fuego, Argentina. PLOS ONE (2018).
7. Bayesian Inference on the Effect of Density Dependence and Weather on a Guanaco Population from Chile. PLOS ONE (2014).