Velikost legla, velikost jajc in fenologija prihoda na gnezdišče pri navadni čigri Sterna hirundo v SV Sloveniji

Common Terns Sterna hirundo began to return to their breeding sites on the Drava river in early April. The article presents the measurement of 471 Common Terns' eggs from 184 nests. Average clutch size was 2.55 (median = 3, min = 1, max = 4) eggs per nest, with an average egg size of 41.1 x 30....

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Bibliographic Details
Main Authors: Denac, Damijan, Janžekovič, Franc, Štumberger, Borut
Format: Other/Unknown Material
Language:Slovenian
Published: Društvo za opazovanje in proučevanje ptic Slovenije 2015
Subjects:
ptice
čigre
navadna čigra
Sterna hirundo
prvi pomladanski prihod
velikost legla
velikost jajc
Slovenija
severovzhodna Slovenija
birds
common tern
first spring arrival
clutch size
eggs size
Slovenia
North-eastern Slovenia
info:eu-repo/classification/udc/598.8(497.4)
Common tern
Online Access:https://dk.um.si/IzpisGradiva.php?id=53081
https://dk.um.si/Dokument.php?id=77641&dn=
http://www.cobiss.si/scripts/cobiss?command=DISPLAY&base=cobib&rid=13071368&fmt=11
Description
Summary:Common Terns Sterna hirundo began to return to their breeding sites on the Drava river in early April. The article presents the measurement of 471 Common Terns' eggs from 184 nests. Average clutch size was 2.55 (median = 3, min = 1, max = 4) eggs per nest, with an average egg size of 41.1 x 30.3 mm. There was no characteristic difference in the average egg length between the two-, three- and four-egg clutches. Concerning the average breadth of eggs, characteristic differences were noted particularly in four-egg clutches. Correlation between egg length and breadth was very loose (r = 0.25, p 0.0001). Egg length was more variable (CV%EL =4.33) than egg breadth (CV = 2.96). Size patterns in Common Terns' clutches were not quite consistent with the brood-reduction hypothesis, according to which every egg laid in a single nest is smaller than the previous one

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