Data from: Cannibalism and activity rate in larval damselflies increase along a latitudinal gradient as a consequence of time constraints
Sniegula, Szymon, Institute of Nature Conservation
Golab, Maria J., Institute of Nature Conservation
Johansson, Frank, Department of Ecology and Genetics, Uppsala, Sweden
Published Jul 05, 2017 on Dryad.
Cite this dataset
Sniegula, Szymon; Golab, Maria J.; Johansson, Frank (2017). Data from: Cannibalism and activity rate in larval damselflies increase along a latitudinal gradient as a consequence of time constraints [Dataset]. Dryad. https://doi.org/10.5061/dryad.s8k68
Background: Predation is ubiquitous in nature. One form of predation is cannibalism, which is affected by many factors such as size structure and resource density. However, cannibalism may also be influenced by abiotic factors such as seasonal time constraints. Since time constraints are greater at high latitudes, cannibalism could be stronger at such latitudes, but we know next to nothing about latitudinal variation in cannibalism. In this study, we examined cannibalism and activity in larvae of the damselfly Lestes sponsa along a latitudinal gradient across Europe. We did this by raising larvae from the egg stage at different temperatures and photoperiods corresponding to different latitudes. Results: We found that the more seasonally time-constrained populations in northern latitudes and individuals subjected to greater seasonal time constraints exhibited a higher level of cannibalism. We also found that activity was higher at north latitude conditions, and thus correlated with cannibalism, suggesting that this behaviour mediates higher levels of cannibalism in time-constrained animals. Conclusions: Our results go counter to the classical latitude-predation pattern which predicts higher predation at lower latitudes, since we found that predation was stronger at higher latitudes. The differences in cannibalism might have implications for population dynamics along the latitudinal gradients, but further experiments are needed to explore this.
Sniegula et al._REPOSITORY
Data saved in Excel file. Data file has the following columns: region - region of origin; latitude - latitude of origin; pop - population; measure - number of larvae survived unitl day 12 (m1) and day 28 (m2); surviv - either survived (1) or was cannibilized (2); larvae - number of days until one larva left in a container; walk.dist - total distance moved; walk.mean - mean distance per move; moves - number of moves; eaten - number of larvae cannibalized;