Abstract
The movement of animals affects the biodiversity, ecological processes,
and resilience of an ecosystem. For the animals, moving has costs as
well as benefits and the use of a given landscape provides insights into
animal decisions and behavioral ecology. Understanding how animals use
the landscape can thus clarify their effects on ecosystems and inform
conservation measures aiming at preserving and restoring the ecological
functions of animal dispersal. Here, we investigated the habitat
preferences of African savanna elephants (Loxodonta africana) using GPS
data from 155 individuals collected between 1998 and 2020 in Northern
Kenya. In particular, we assessed how “energy landscapes”, i.e. the
cost of locomotion due to the slope of the terrain and the animal body
mass, together with elevation, vegetation productivity, water
availability, and proximity to human settlements influence the habitat
preferences of elephants. We found that the energy landscape is the most
consistent predictor of elephants’ preferences, with individuals
generally avoiding energetically costly areas and preferring highly
productive habitats. We also found that other predictors such as
elevation, water availability and human presence, are important in
determining habitat usage, but varied greatly among elephants, with some
individuals preferring habitats avoided by others. Our analysis
highlights the importance of the energy landscape as a key driver of
habitat preferences of elephants. Importantly, the enerscape modeling
environment allowed us to develop testable hypotheses from rather
coarse-grained data covering elephant movements and a few environmental
parameters. Energy landscapes rely on fundamental biomechanical and
physical principles and provide a mechanistic understanding of the
observed preference patterns, allowing to disentangle key causal drivers
of an animal’s preferences from correlational effects. This, in turn,
has important implications for assessing and planning conservation and
restoration measures, such as dispersal corridors, by explicitly
accounting for the energy costs of moving.