Comparison of spring and summer clutches of Great Crested Grebes (Podiceps cristatus)

Rajchard, Josef and Navrátil, Josef and Frazier, Ryan J. and Ježková, Eva and Marková, Kateřina (2020) Comparison of spring and summer clutches of Great Crested Grebes (Podiceps cristatus). ACTA ZOOLOGICA ACADEMIAE SCIENTIARUM HUNGARICAE, 66 (4). ISSN 1217-8837

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Abstract

The intensively farmed fishponds of the Třeboň Basin in South Bohemia, Czech Republic, host a substantial number of Great Crested Grebe (Podiceps cristatus) pairs that nest later than the expected spring season. This may be associated with fishpond farming. Our work found no substantial difference between spring and summer egg characteristics and no differences between the number of eggs in spring and summer clutches. The high number of eggs in spring nests was significantly related to both decreasing distances between nests and decreasing number of nests on the fishpond. The increase of the number of eggs in summer nests was significantly related to the distance to the edge of littoral vegetation.

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