INVESTIGADORES
MARTELLA Monica Beatriz
artículos
Título:
VIGILANCE IN THE GREATER RHEA: EFFECTS OF VEGETATION HEIGHT AND GROUP SIZE
Autor/es:
MARTELLA, M. B.; RENISON, D.; NAVARRO, J.L.
Revista:
JOURNAL OF FIELD ORNITHOLOGY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 1995 p. 215 - 220
ISSN:
0273-8570
Resumen:
--Wild adult Greater Rheas (Rhea americana) were observed during most of the non-breeding season (May-July), while feeding alone or in groups in two different habitats: high vegetation (shrubs) and low vegetation (herbaceous). In both habitats an indix4dual´s percentage of time spent on vigilance behavior significantly declined as group size increased, but in high vegetation vigilance was lowest when group size was six and higher in larger groups. Vigilance was similar between sexes throughout the day. Vigilance was on average 11% greater in the high vegetation habitat. Vigilance increased from May to July.
