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Biological sciences

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Patterns of habitat use for pied and sooty oystercatchers nesting at the Furneaux Islands, Australia

Article Abstract:

The differential habitats of Pied and Sooty Oystercatchers at general habitat levels helps them to coexist ecologically in the Furneaux Islands in Australia. Coastal birds prefer to nest in higher densities on small islands to reduce predation risk and to lower human disturbance levels. The location of nesting depends on preferred feeding substrates and the choice of rock or sand. The Sooty variety nest only in small rocky islands while the Pied ones choose islands that are sandy. Behavioral observations show a lack of thermoregulatory stress between the two species.

Analysis, Predation (Biology), Ornithological research, Oystercatcher, Oystercatchers

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Sources of variation in clutch size, egg size and clutch completion dates of Semipalted Plovers in Churchill, Manitoba

Article Abstract:

The sources of variation in clutch size, egg size and clutch completion dates of Semipalted Plovers were studied. Results reveal that clutch completion dates were negatively related with the average temperature during the pre-laying period. Furthermore, egg volume and mass were not reduced due to cold weather, but was rather attributed to differences among the female birds' body mass.

Research, Birds, Bird eggs, Bird nests, Shore birds, Shorebirds

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Copulation behavior, mate guarding, and paternity in the Semipalmated Plover

Article Abstract:

Copulation and mate guarding behavior amongst Semipalmated Plovers was observed. Copulations occurred 6.2 days prior to clutch initiation and males spent 64% of their time in visual contact with their mates. Extra-pair copulations were infrequent. Mate guarding was more pronounced in coastal areas of birds than among solitary-nesting pairs.

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