|DOI / URL
||Does movement behaviour predict population densities? A test with 25 butterfly species
||Schultz, C.B.; Pe'er, B.G.; Damiani, C.; Brown, L.; Crone, E.E.;
||Journal of Animal Ecology
||OEKON; NSF; iDiv;
|POF III (all)
||butterflies; correlated random walk; diffusion; dispersal; expected net squared displacement; movement ecology
|UFZ wide themes
which approximates a correlated random walk, has been used by
ecologists to describe movement, and forms the basis for many
theoretical models. However, it is often criticized as too simple a
model to describe animal movement in real populations.
- We test a
key prediction of diffusion models, namely, that animals should be more
abundant in land cover classes through which they move more slowly.
This relationship between density and diffusion has rarely been tested
across multiple species within a given landscape.
- We estimated
diffusion rates and corresponding densities of 25 Israeli butterfly
species from flight path data and visual surveys. The data were
collected across 19 sites in heterogeneous landscapes with four land
cover classes: semi-natural habitat, olive groves, wheat fields and
- As expected from theory, species tended to have
higher densities in land cover classes through which they moved more
slowly and lower densities in land cover classes through which they
moved more quickly. Two components of movement (move length and turning
angle) were not associated with density, nor was expected net squared
displacement. Move time, however, was associated with density, and
animals spent more time per move step in areas with higher density.
broad association we document between movement behaviour and density
suggests that diffusion is a good first approximation of movement in
butterflies. Moreover, our analyses demonstrate that dispersal is not a
species-invariant trait, but rather one that depends on landscape
context. Thus, land cover classes with high diffusion rates are likely
to have low densities and be effective conduits for movement.
|Persistent UFZ Identifier
|Schultz, C.B., Pe'er, B.G., Damiani, C., Brown, L., Crone, E.E. (2017):
Does movement behaviour predict population densities? A test with 25 butterfly species
J. Anim. Ecol. 86 (2), 384 - 393