Published by

Polish Zoological Society
Bird Migration Research Foundation

  Editorial board

Editor:
Prof. dr hab. Przemysław Busse

Managing/Subject Editor:
Dr Agnieszka Ożarowska

Secretary:
Dr Izabella Rząd

Editorial Members:
Lorenzo Fornasari (Italy)
Wulf Gatter (Germany)
Wojciech Kania (Poland)
Vladimir Payevsky (Russia)
Pertti Saurola (Finland)
Reuven Yosef (Israel)

  Editorial address

Przebendowo
84-210 Choczewo, Poland
phone/fax:
(+48) 58 572 23 96
email:
ring@wbwp-fund.eu

  Subscription in Poland

Dom Handlowy Nauki
Sp. z o.o.
ul. Szczęśliwicka 2/17
02-352 Warszawa, Poland
phone: (+48) 22 658 15 58
fax: (+48) 22 822 98 69
email: ksiegarnia@dhn.pl
czasopismakraj@dhn.pl

   THE RING, Vol. 21, No 2, 1999

CONTENTS:

J. NOWAKOWSKI
Terms of autumn of the genus Sylvia in central Poland
(page 3)

K.T. PEDERSEN, E.B. FRITZE, S.P. KHARITONOV
How do Common Gulls (Larus canus) pass through Copenhagen on migration?
(page 15)

W. MEISSNER, C. NITECKI
The species composition and the age structure of gulls wintering in the selected places of the Gulf of Gdansk
(page 23)

W. MEISSNER
Autumn migration of the Common Tern (Stern hirundo) and the Sandwich Tern (Sterna sandvivensis) in the Puck Bay
(page 41)

Proceedings of the 2nd Polish Seminar on Wader Studies
(page 55)

Methods

P. BUSSE, A. TROCINSKA
Evaluation of orientation experiment data using circular statistic - doubts and pitfals in assumptions
(page 107)

K. KOPIEC-MOKWA
Dates of migration waves - a coincidence or an effect of biologically based mechanism? Improvement of the method of analysing the seasonal migration dynamics
(page 131)

P. BUSSE
Correlative topography by Krigging - a useful method to study intra-group biometrical differentiation
(page 145)

Information