Paternal care in the cooperatively polyandrous Galapagos Hawk

Article Abstract:

Galapagos Hawks (Buteo galapagoensis) living in a territory are cooperatively polyandrous. Males in a group share in caring for the young without any definite correlation with paternity. Paternal care is variable, and all males care for young ones whatever the number of males in the group. The status of males appears to be relatively equal, with only subtle indications of dominance. The groups are stable and the survival rates of members is over 90%. The production of offspring and the chances of becoming part of the breeding population are low. Male group members have some chance to produce offspring and thus an incentive to care for the young.

Hawks, Parental behavior in animals, Animal parental behavior, Animal reproduction, Polyandry

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The distribution of neotropical migrant birds wintering in the El Cielo Biosphere Reserve, Tamaulipas, Mexico

Article Abstract:

The winter bird community in four habitats in the mountains of northeastern Mexico was examined to emphasize the distribution and relative abundance of migrant species among habitats in a geographical area. A point count survey showed visible or calling species using all levels of vegetation. A high number and relative abundance of migrant species in El Cielo Biosphere Reserve revealed that some species were faithful to a specific site both within a season and between subsequent winters.

Mexico, Animal migration, National parks and reserves, National parks, Bird migration, Parks

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Evidence for edge effects on multiple levels in tallgrass prairie

Article Abstract:

Research is presented which tests the effectiveness of nest sites situated on the edges of a tallgrass prairie ecosystem in MI, in terms of the survival of eggs and nestlings. The nests of Dickcissels and Henslow's sparrows are studied.

Environmental aspects, Natural history, Predation (Biology), Missouri, Bird eggs, Bird nests, Sparrows, Prairies

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