ARTICLES

Daily and seasonal activity of Moorhens studied by motion-sensitive transmitters. C. Acquarone,
M. Cucco, and G. Malacarne ................................................................................................................................. 1-7

Satellite tracking of the Pink-footed Shearwater in Chile. D. Guicking, D. Ristow, P. H. Becker, R.
Schlatter, P. Berthold, and U. Querner .................................................................................................................. 8-15

Habitat changes in Laguna de Pozuelos, Jujuy, Argentina: Implications for South American Flamingo
populations. V. Mascitti ......................................................................................................................................... 16-21

The importance of survey timing in monitoring breeding seabird numbers. C. M. Johnson and W. B.
Krohn ...................................................................................................................................................................... 22-33

Bill size in relation to position in the colony in the Chinstrap Penguin. E. Mínguez, J. Belliure, and
M. Ferrer ................................................................................................................................................................ 34-38

Winter age ratios and the assessment of recruitment of Harlequin Ducks. C. M. Smith, R. I. Goudie,
and F. Cooke .......................................................................................................................................................... 39-44

Sex does not affect early growth or survival in chicks of the Roseate Tern. I. C. T. Nisbet and P. Szczys....... 45-49

Breeding season diet of Scarlet Ibises and Little Blue Herons in a Brazilian mangrove swamp. F. Olmos,
R. E. S. Silva, and A. Prado .................................................................................................................................... 50-57

Breeding biology and nest site characteristics of the Scarlet Ibis in southeastern Brazil. F. Olmos and
R. E. S. Silva ........................................................................................................................................................... 58-67

Living with gulls: The consequences for Sandwich Terns of breeding in association with Black-headed
Gulls. E. W. M. Stienen, A. Brenninkmeijer, and C. E. Geschiere ........................................................................ 68-82

Intraspecific variation in the egg size of the Pied Avocet. T. Dittman and H. Hötker ....................................... 83-88

Food and feeding biology of the Common Tern during the nonbreeding season in Samborombon Bay,
Buenos Aires, Argentina. L. Mauco, M. Favero, and M. S. Bó ........................................................................... 89-96

The dynamics of a colonization event in the European Shag: The roles of immigration and demographic
stochasticity. A. Martínez-Abrain, D. Oro, and J. Jiménez................................................................................... 97-102

Waterbird richness in Altiplano wetlands in northwestern Argentina. S. M. Caziani, E. J. Derlindati, A.
Tálamo, A. L. Sureda, C. E. Trucco, and G. Nicolossi ........................................................................................... 103-117

NOTES
Feeding by Kelp Gulls on rodents during a mouse outbreak at an inland area in southern Chile. J.
Ruiz and A. Simeone ................................................................................................................................................ 118-120

Double-brooding in Red-necked Grebes. J. Kloskowski ..................................................................................... 121-124

Feeding associations between Snowy Egrets and Red-breasted Mergansers. J. Bennett and W. S.
Smithson .................................................................................................................................................................. 125-128

Autumn and winter diet of Long-tailed Duck in the Belcher Islands, Nunavit, Canada. S. E. Jamieson,
G. J. Robertson, and H. G. Gilchrist ....................................................................................................................... 129-132

Enhanced success of California Gulls nesting in enclosures. J. R. Jehl, Jr. ........................................................ 133-136

Seabird by-catch in small-scale longline fisheries in northern Peru. J. Jahncke, E. Goya, and A. Guillen ........ 137-141

NOTEWORTHY LITERATURE: Edited by David N. Nettleship..................................................................... 142-148

Instructions for Contributors ................................................................................................................................. 149-150

Editorial Staff .......................................................................................................................................................... 151