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Abstract

Communication within families of Umbonia crassicornis in response to predation by the vespid Pseudopolybia compressa was studied in Costa Rica on Enterolobium cyclocarpum and Acacia centralis during July-August 1996. Aggregations of U. crassicornis were filmed and vibrational signals were recorded. ...

Author(s)
Cocroft, R. B.
Citation
Ethology, 1999, 105, 7, pp 553-568
Abstract

White-throated Magpie-Jays (Calocitta formosa) breed cooperatively and defend permanent, all-purpose group territories. Territory area, resource levels, resource dispersion, group size, and group reproductive success for 14 groups were recorded over a three-year period (April 1991-August 1993) in...

Author(s)
Langen, T. A.; Vehrencamp, S. L.
Citation
Auk, 1998, 115, 2, pp 327-339
Abstract

Experimental forager removals were performed in Guanacaste Province, Costa Rica, to assess the mechanisms by which P. instabilis colonies regulate their intake of nectar and water. Most foragers gathered nectar, while water was collected by a small number of fixated foragers. Removal of the most...

Author(s)
O'Donnell, S.
Citation
Behaviour, 1998, 135, 2, pp 173-193
Abstract

During colony defence, workers of several species of Neotropical swarm-founding wasps (Agelaia panamensis, A. yepocapa, Apoica albomacula, Brachygastra augusti, Epipona nigra, Polybia dimorpha and Synoeca septentrionalis, as observed in Costa Rica, Panama, Peru and Brazil) hold the distal tip of...

Author(s)
O'Donnell, S.; Hunt, J. H.; Jeanne, R. L.
Citation
Journal of the Kansas Entomological Society, 1997, 70, 3, pp 175-180
Abstract

Dominance interactions among workers may influence division of labour within the worker caste of eusocial insect colonies. The relationships between body size, dominance interactions and age-based division of labour in the advanced eusocial (swarm-founding) wasp P. occidentalis were examined....

Author(s)
O'Donnell, S.; Jeanne, R. L.
Citation
Journal of the Kansas Entomological Society, 1995, 68, 1, pp 43-50
Abstract

Recent models of energetically efficient division of labour in eusocial insects predict that risky tasks will be performed by workers with low nutrient content. Changes in workers' nutrient stores (chloroform:methanol extractable lipids) were measured in relation to age-based division of labour in...

Author(s)
O'Donnell, S.; Jeanne, R. L.
Citation
Experientia, 1995, 51, 7, pp 749-752
Abstract

The relationships between foraging tenure and specialization on materials, and foraging tenure and foraging activity were measured for marked, known-age workers of Polybia occidentalis in the field in Costa Rica during June-August 1989. Workers terminated foraging at an average of 5.9 days after...

Author(s)
O'Donnell, S.; Jeanne, R. L.
Citation
Animal Behaviour, 1992, 44, 6, pp 1021-1027
Abstract

A worker of Polistes pacificus mouthed and rubbed her gaster over 2 newly emerged wasps. This behaviour, which differs from previously documented behaviours in Polistes, is described on the basis of observations made in Costa Rica.

Author(s)
Richter, M. R.; Downing, H.; Richter, W.
Citation
Journal of the Kansas Entomological Society, 1987, 60, 2, pp 347-349

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