REPRODUCTIVE ECOLOGY OF THE RUDDY GROUND-DOVE ON THE CENTRAL PLATEAU OF BRAZIL
Author(s): RENATO CINTRA
The reproductive ecology of the Ruddy Ground-Dove (Columbina talpacoti) was studied between January 1982 and February 1983 in the Cerrado of the Central Plateau of Brazil. A total of 2 18 nests were found in 19 plant species, at heights ranging from ground level to 7.5 m. Nest construction was observed in all months except October. Some pairs reared a second clutch in the same nest in the same year. There was no significant difference between the sexes in nest defense behavior. The median clutch size of 200 nests was two. Fledglings remained with their parents for 25 days. One reached sexual maturity three months after hatching. The average daily mortality rate of eggs based on the Mayfield ( 196 1, 1975) method was lowest (2.8%) in April-May and highest (8%) in November-December. The mean rate of daily egg mortality rate in all nests over the year was 4.4%. The total daily mortality rate of nestlings was (3.8%) ranging from (1 .O%) in August-September to (5%) in February-March. There was a significant difference in the rate of predation on eggs and on nestlings. The highest rate of predation occurred during the peak of fledgling production. The probability of a nestling remaining in the nest until fledging was 63.3% and the probability of the nestling surviving from laying to fledging was 36.7%. At the end of incubation, there was an average of 1.2 eggs per nest and a mean of 0.7 nestlings per nest fledged.
Source: Wilson Bull., 100(3), 1988, pp. 443-457
Eimeria curvata n. sp. (Apicomplexa: Eimeriidae) in Columbina talpacoti and Scardafella squammata (Aves: Columbidae) from Brazil
Author(s): Edson A Adriano, Patricia J Thyssen, Nelson S Cordeiro
Eimeria curvata is a new coccidian described in the doves Columbina talpacoti and Scardafella squammata from western of the State of São Paulo, Brazil. The oocysts are ovoid to ellipsoid, 18.3 (17- 19) ?m x 15.5 (15-17) ?m, with a shape index of 1.2 (1.1-1.3). The wall is colorless, smooth and doublelayered. A polar granule is present, but there is no micropyle or oocyst residuum. The sporocysts are elongate, 12.3 (11.5-13) ?m x 5.8 (5.5-6) ?m with a curved anterior portion and a smooth, thin, singlelayered wall. The Stieda body is protuberant and nipple-like; there is no substieda body. The sporozoites lie head-to-tail in the sporocyst and contain a large refractile body at the extremities. The sporocyst residuum contains small granules uniformly distributed in the middle of the sporocyst. The prevalence of E. curvata n. sp. was 17.4% and 12.8% in C. talpacoti and S. squammata, respectively.
Source: Mem Inst Oswaldo Cruz, Rio de Janeiro, Vol. 95(1): 53-55, Jan./Feb. 2000