Although differences in food-hoarding tactics both reflect a behavioral response to cache pilferage among rodent species
and may help explain their coexistence, differentiation in cache pilfering abilities among sympatric rodents with different hoarding
strategies is seldom addressed. We carried out semi-natural enclosure experiments to investigate seed hoarding tactics among three
sympatric rodent species (
Tamias sibiricus
,
Apodemus peninsulae
and
Clethrionomys rufocanus
) and the relationship of their
pilfering abilities at the inter- and intraspecific levels. Our results showed that
T. sibiricus exhibited a relatively stronger pilfering
ability than
A. peninsulae and
C. rufocanus, as indicated by its higher recovery rate of artificial caches. Meanwhile
A. peninsulae
showed a medium pilfering ability and
C. rufocanus displayed the lowest ability. We also noted that both cache size and cache depth
significantly affected cache recovery in all three species.
T. sibiricus scatter-hoarded more seeds than it larder-hoarded,
A. peninsulae
larder-hoarded more than scatter-hoarded, and
C. rufocanus acted as a pure larder-hoarder. In
T. sibiricus, individuals with lower
pilfering abilities tended to scatter hoard seeds, indicating an intraspecific variation in hoarding propensity. Collectively, these results
indicated that sympatric rodent species seem to deploy different food hoarding tactics that allow their coexistence in the temperate
forests, suggesting a strong connection between hoarding strategy and pilfering ability.
