The present article reviews recent and older literature on the
spatial parameters that flowers
display, as well as on the capacities of anthophilous insects to
perceive and use these
parameters for optimizing their foraging success. Although co-evolution
of plants and
pollinators has frequently been discussed with respect to floral
colours and insect colour
vision, it has rarely been assessed with respect to insect spatial
vision and spatial floral cues,
such as shape, pattern, size, contrast, symmetry, spatial frequency,
contour density and
orientation of contours. This review is an attempt to fill
this gap. From experimental findings
and observations on both flowers and insects, we arrive at the
conclusion that all of the spatial
and spatio-temporal parameters that flowers offer are relevant
to the foraging task and are
tuned to the insect's visual capacities and visually guided
behaviour. We try, in addition, to
indicate that temporal cues are closely related to spatial cues, and
must therefore be included
when flower–pollinator interactions are examined. We include
results that show that colour
vision and spatial vision have diverged over the course of evolution,
particularly regarding the
processing of spatio-temporal information, but that colour vision
plays a role in the processing
of spatial cues that are independent of temporal parameters. By
presenting this review we hope
to contribute to closer collaboration among scientists working in the
vast fields of botany, ecology, evolution, ethology and sensory physiology.