Category: Laridae

The Distribution and Conservation Status of the Gull-billed Tern ( Gelochelidon nilotica ) in North America

Gull-billed Tern (Gelochelidon nilotica) Science Article 2 abstract The Gull-billed Tern (Gelochelidon nilotica) has until recently received little conservation and managementattention within North America despite a relatively low overall population size and significant declines inparts of the breeding range. This lack of attention may stem in part from the wide distribution of the species, encompassingparts […]

Fledgling sex ratio variation in colonies of Gull-billed Tern Gelochelidon nilotica

Gull-billed Tern (Gelochelidon nilotica) Science Article 1 abstract Fisher (1930) predicted that natural selectionshould favour equal parental investmentin male and female offspring, and that populationsex ratios at the end of the period ofparental care should be inversely related to thecost of producing individuals of each sex if fitnessreturns from investment in sons and daughtersare similar. […]

A vagrant Laughing Gull (Larus africilfa) from Pitcairn Island

Laughing Gull (Leucophaeus atricilla) Science Article 3 abstract During mid-March 1992, I discovered the remains of a Laughing Gull (Lamatricilla) at Down Rope Beach, Pitcairn Island. It appeared to have beendead for approximately one month. The distance from Pitcairn Island tothe wintering grounds of this North American gull is over 5,000 km GRAHAM WRAGG, NOTORNIS […]

Population dynamics, recruitment, individual quality and reproductive strategies in Common Terns Sterna hirundo marked with transponders

Common Tern (Sterna hirundo) Science Article 6 abstract From 1992 to 1999, we used subcutaneously injected transponders, enabling remote and automatic annual identification with the aim of performing an integrated population study of a Common Tern Sterna hirundo colony. Within a few years, population parameters and their inter-year variation could be calculated with a high […]

Population dynamics, recruitment, individual quality an d reproductive strategies in Common Terns Sterna hirundo marked with tran sponders

Common Tern (Sterna hirundo) Science Article 2 abstract From 1992 to 1999, we used subcut aneously injected transponders, enabling remote an d automatic annual identification with the aim of performing an integrated population study of a Common Tern Sterna hirundo colony. Within a few years, population parameters an d their inter-year variation could be calculated […]

Growth and energetics of chicks of the sooty tern (sterna fuscata) and common tern (s. hirundo)

Common Tern (Sterna hirundo) Science Article 7 abstract We measured the energy budgets of chicks of the Common Tern (Sterna hitundo)on Great Gull Island, New York and of the Sooty Tern (S. fuscata) on the Dry Tortugas, Florida. The respiratory energy requirement was determined by measuring oxygen consumption in a closed system. We calculated the […]

Some observations on the occurrence of three generations of primaries in Common Terns Sterna hirundo

Common Tern (Sterna hirundo) Science Article 3 abstract In adult Common Terns Sterna hirundo, the post-nuptial primary moult begins either near the breeding grounds (Cramp 1985) or upon arrival at the wintering grounds (L Underhill pers comm). Moult starts with the innermost primary (p1, numbered descendantly) and all birds initiate moult by October (Cramp 1985, […]

Individual quality and recruitment in the common tern, Sternahirundo

Common Tern (Sterna hirundo) Science Article 4 abstract We investigated the individual histories of more than 1 300 fledglings from an intensively studied colony of commonterns, Sterna hirundo. Based on six cohorts (1992-1998), which had recruited almost completely by 2002, we found that thebody mass of a fledgling was positively related to return and recruitment […]

Body mass fluctuations and mortality in Common Tern Sterna hirundo chicks dependent on weather and tide in the wadden sea germany.

Common Tern (Sterna hirundo) Science Article 5 abstract In three Common Tern colonies in the German Wadden Sea the relationships between mortality, body mass of chicks, weather and the tide-dependent change in the daily span of time favourable for feeding (TFO-DH) were studied. On the island Oldeoog weather fluctuations between years were more pronounced and […]