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The Distribution of the Spawn‐ponds of the Common Frog, Rana temporaria temporaria Linn., over a portion of the London Clay and associated Drift
Author(s) -
Savage R. Maxwell
Publication year - 1939
Publication title -
proceedings of the zoological society of london
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0370-2774
DOI - 10.1111/j.1096-3642.1939.tb00043.x
Subject(s) - spawn (biology) , biology , ecology , environmental science , fishery
SUMMARY.1 The distribution of spawn ponds of the frog in an area with a varied geology is not at random. The frogs avoid London Clay ponds. 2 Significant relationships have been found between the potassium content of the water of ponds and the presence or absence of spawn. Carbonates also affect the spawn distribution. 3 There is some evidence that concrete ponds or concrete structures in streams favourably affect the chances that frogs will spawn at such places. 4 Pollution by sewage seems a favourable factor. 5 The mechanism by which such factors can act is discussed, and it is suggested that indirect action is most likely, through the intermediary of the micro‐flora.