Showing papers by "Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto published in 1969"
TL;DR: The duration of brood development period seems to be one of the most important factors influencing adult worker longevity in bumble bee species.
Abstract: Survivorship curves and longevity of workers were studied in two queenright and two queenless colonies of Bombus ( Fervidobombus) atratus . Survivorship curves for workers of all colonies were, in general, convex, indicating an increasing mortality rate with increasing age. The mean longevity for the workers from queenright colonies, 24.3 days and 17.6 days, was not significantly different from !hat in queenless colonies, 21.2 days and 20.2 days. In all colonies workers started foraging activities when aged 0-5 days, and the potential forager rates rose progressively with increasing age. Mortality rates within each age interval were significantly correlated with the foraging worker rates in all colonies. Only in two of the colonies (one queenright and one queenless) longevity was significantly correJated with worker size. The duration of brood development period seems lo be one of the most important factors influencing adult worker Jongevity in bumble bee species.
27 citations
TL;DR: There was a positive correlation between reproductive niche width and evenness and the sizes of the reproductive niches were significantly different in Trypoxylon (Trypargilum) lactitarse.
Abstract: Fifty one nests and 200 cells of Trypoxylon (Trypargilum) lactitarse were obtained from trap-nests (cut bamboo stems) in Santa Carlota Farm (in two habitats: Itaoca Section-IS and Santana Section-SS), Cajuru and on the Sao Paulo University Campus, Ribeirao Preto (RP), both in the State of Sao Paulo, Brazil. The prey (spiders) of 18 cells from IS, 38 from SS and 70 from RP were identified. Nesting most frequently occurred during the hot and wet seasons (September to April). T. lactitarse preyed upon representatives of ten spider families. Araneidae (96.6%) (orb-weaver spiders) were the most frequent. Eustala sp.1 was the most frequently collected species in the three habitats (31.6% in IS, 20.1% in SS and 48.7% in RP), followed by Acacesia hamata (19.5%) and Alpaida leucogramma (10%) in IS, by Parawixia audax (16%) and A. hamata (15.4%) in SS and by P. audax (17.9%) and Eustala sp.2 (12%) in RP. The sizes of the reproductive niches were significantly different. There was a positive correlation between reproductive niche width and evenness.
20 citations
TL;DR: The orientation of recruited foragers could be attributed to the scent of the food source and also (to a lesser extent) to the information provided by the angle of the dance performed.
Abstract: SummaryA single bee in each experiment was trained to walk to a syrup supply at the far end of a tube 1–3 m long outside an observation hive. The orientation of recruited foragers could be attributed to the scent of the food source and also (to a lesser extent) to the information provided by the angle of the dance performed.
11 citations