Lesser Black-backed Gull (graellsii & intermedius)

(last update: May 17 2015)

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LBBG rings

lbbg 1cy May
lbbg 1cy June
lbbg 1cy July
lbbg 1cy August
lbbg 1cy September
lbbg 1cy October
lbbg 1cy Nov - Dec

lbbg 2cy Jan-Febr
lbbg 2cy Mar-April
lbbg 2cy May
lbbg 2cy June
lbbg 2cy July
lbbg 2cy August
lbbg 2cy September
lbbg 2cy October
lbbg 2cy Nov - Dec

lbbg 3cy Jan-April
lbbg 3cy May
lbbg 3cy June
lbbg 3cy July
lbbg 3cy August
lbbg 3cy September
lbbg 3cy October
lbbg 3cy Nov - Dec

lbbg sub-ad Jan-April
lbbg sub-ad May
lbbg sub-ad June
lbbg sub-ad July
lbbg sub-ad Aug
lbbg sub-ad Sept
lbbg sub-ad Oct
lbbg sub-ad Nov - Dec

lbbg adult January
lbbg adult February
lbbg adult March
lbbg adult April
lbbg adult May
lbbg adult June
lbbg adult July
lbbg adult August
lbbg adult September
lbbg adult October
lbbg adult Nov - Dec

LBBG 1cy: Body mass increment and wing length in juvenile LBBG

This page contains two plots to illustrate the variation and pace in growth rate for juvenile LBBG in a year with food shortage (1992) and food abundance (1993) at Terschelling. We also included the plot for Europoort (1992) to illustrate the similarity with Terschelling, the same year.
We used these graphs to allocate some juveniles, of which the exact hatching date was not confirmed by field observations. Although not exact to the day, these plots allow classification of juveniles in one of the actegories we used:
- Category I: hatched before June 10
- Category II: hatched between June 10 and June 20
- Category III: hatched after June 20

Plots from: Spaans A L, Bukacinska M, Bukacinski D, Swelm N D v. 1994. The relationship between food supply, reproductive parameters and population dynamics in Dutch Lesser Black-backed Gulls Larus fuscus: a pilot study. IBN Research Report 94/9, Wageningen,The Netherlands.