|
|
|
|
|
| Oren,David C.. |
| Summary The avian genus Progne (martins) is well known for its tendency to roost in aggregations of thousands of individuals. A concentration of approximately 100.000 Progne modesta (southern martins) with 5.000 P. subis (purple martins) in the Peruvian Amazon city of Iquitos in September 1978 is described, with a history of the species occurance in the area. Up to 250.000 individuals of the two species roosted in the Plaza de Armas of Iquitos from April to mid-August 1978. when trees used as roosting sites were cut in an attempt to drive the birds away. By virtue of a rescue effort to replace the lost perches, 100.000 birds were still found in the plaza in mid-September, the remainder having died or left. In September the birds distinctly preferred the... |
| Ano: 1980 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59671980000400933 |
| |
|
| |
|
|
| Oren,David C.; Smith,Nigel J. H.. |
| Summary The African finch Estrilda astrild is the only exotic bird other than the pigeon to have successfully colonized central Amazonia. The species distribution in Brasil is reviewed. E. astrild has gained a foothold in Amazonia by exploiting grasses native to its original home in Africa. The species potential for agricultural damage is small unless it adapts to feeding on rice. It appears unlikely that E. astrild will displace any native birds. |
| Ano: 1978 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59671978000400699 |
| |
|
|
|
