A quantitative study of mortality at emergence in the damselfly Pyrrhosoma nymphula (Sulzer) (Zygoptera: Coenagrionidae) |
| |
| Authors: | SIMON D. GRIBBIN DAVJD J. THOMPSON |
| |
| Affiliation: | Department of Environmental and Evolutionary Biology, University of Liverpool |
| |
| Abstract: | SUMMARY. - 1 Emergence of the damselfly Pyrrhosoma nymphula was studied over three seasons in two ponds in northern England.
- 2 Numbers emerging were significantly negatively correlated with temperature and atmospheric pressure.
- 3 Overall mortality at emergence was 28%. of which predators (largely birds, ants and spiders) accounted for 22% and climatic factors 6%.
- 4 Daily mortality estimates were significantly positively correlated with precipitation.
- 5 There was no evidence of density dependent mortality at emergence.
|
| |
| Keywords: | |
|
