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A quantitative study of mortality at emergence in the damselfly Pyrrhosoma nymphula (Sulzer) (Zygoptera: Coenagrionidae)
Author(s) -
GRIBBIN SIMON D.,
THOMPSON DAVJD J.
Publication year - 1990
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1111/j.1365-2427.1990.tb00710.x
Subject(s) - damselfly , coenagrionidae , odonata , ecology , predation , biology , precipitation , zoology , geography , meteorology
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.