The Effects of Temperature on Grouping and Feeding in Woodlice (Oniscus asellus)

My year-long research on the terrestrial isopod Oniscus asellus examines the possible effects of climate change on this species and indirectly on the forests where it lives.  This species performs many roles in the... [ view full abstract ]

My year-long research on the terrestrial isopod Oniscus asellus examines the possible effects of climate change on this species and indirectly on the forests where it lives.  This species performs many roles in the decomposition of leaf litter and other dead organic matter in a variety of ecosystems worldwide.  Oniscus asellus is also very sensitive to its environment in terms of temperature and moisture, though the full effects of temperature are not yet fully understood.  As the climate warms, it will be important to understand how the behavior of these decomposers will change and impact the ecosystems in which they live.  In controlled laboratory experiments, I tested the effect of a change in temperature on the grouping (aggregation) and feeding (foraging) behaviors of Oniscus asellus.  Unexpectedly, I learned the importance of proximity for these invertebrates in their choice between different favorable microhabitats.  In addition, I found that a warmer temperature made them more likely to choose food over shelter and less likely to aggregate together in the short term.  Each of these findings is completely new and adds to a bigger picture of how climate change might affect woodlice.