Relation of environmental factors to breeding status of royal and sandwich terns in South Carolina, USA

Blus, Lawrence J.; Prouty, Richard M.; Neely, B.S.

doi:10.1016/0006-3207(79)90056-9

Biological Conservation

1979

DOI: 10.1016/0006-3207(79)90056-9

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Relation of environmental factors to breeding status of royal and sandwich terns in South Carolina, USA

Lawrence J. Blus

Richard M. Prouty

B.S. Neely

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Cited by 9 publications

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“…Becker 1984, Burger & Gochfeld 1991. The effects of gull predation on Royal Terns Sterna maxima and Cayenne Terns Sterna eurygnatha have been reported in several studies, and gull predation is one of the main causes of egg loss in these terns (Ansingh et al 1960, Buckley & Buckley 1972. Blus et al 1979, Daciuk 1979.…”

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confidence: 99%

Predation by Kelp Gulls Larus dominicanus at a mixed‐species colony of Royal Terns Sterna maxima and Cayenne Terns Sterna eurygnatha in Patagonia

Yorio

Quintana

1997

Ibis

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We studied the predator‐prey interaction between Kelp Gulls Larus dominicanus and Royal Terns Sterna maxima and Cayenne Terns Sterna eurygnatha at Punta León, Argentina, from 1990 to 1992. Kelp Gulls were the main predator of tern eggs in all 3 years, accounting for 99% of observed predations (n = 454). A total of 99% of predations occurred on peripheral tern nests. Total predation rate on both tern species was highest in 1990 and varied significantly between years, with between 0.01 and 0.03 cases of predation per hour. Predation rates in all years were significantly higher on Cayenne than on Royal Terns probably because the latter were significantly more aggressive towards gulls than were Cayenne Terns. Royal and Cayenne Terns displayed aggressively towards gulls at least once in 64% and 10% of the observation periods, respectively. Defence behaviour, such as attacking and chasing the predator, was used more frequently by Royal than Cayenne Terns (13.2% v 3.6%). Predation on tern eggs was restricted to only a few Kelp Gulls which nested close to the tern colony periphery, and 50% of the eggs that were stolen were taken by only two pairs during 1991 and 47% by three pairs in 1992. This suggests that the current expansion of the Kelp Gull numbers at Punta León might not necessarily result in a proportional increase in predation rate on both tern species. Stealing eggs from the ground was more successful than from the air (77% v 17%). The nesting strategy shown by Royal and Cayenne Terns at Punta León appears to be an important factor which reduced the impact on their breeding success of high potential predation pressure by gulls.

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confidence: 99%

Predation by Kelp Gulls Larus dominicanus at a mixed‐species colony of Royal Terns Sterna maxima and Cayenne Terns Sterna eurygnatha in Patagonia

Yorio

Quintana

1997

Ibis

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Trends of organochlorine residues in eggs of birds from Italy, 1977 to 1985

Fasola

Vecchio

Caccialanza

et al. 1987

Environmental Pollution

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Mercury levels in North Atlantic seabirds: A synthesis

Pollet

Provencher

Tranquilla

et al. 2022

Marine Pollution Bulletin

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Relation of environmental factors to breeding status of royal and sandwich terns in South Carolina, USA

Cited by 9 publications

References 21 publications

Predation by Kelp Gulls Larus dominicanus at a mixed‐species colony of Royal Terns Sterna maxima and Cayenne Terns Sterna eurygnatha in Patagonia

Predation by Kelp Gulls Larus dominicanus at a mixed‐species colony of Royal Terns Sterna maxima and Cayenne Terns Sterna eurygnatha in Patagonia

Trends of organochlorine residues in eggs of birds from Italy, 1977 to 1985

Mercury levels in North Atlantic seabirds: A synthesis

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