Female-Biased Sex Ratios in a Facultatively Social Bee and Their Implications for Social Evolution

Evolution ◽  
1994 ◽  
Vol 48 (5) ◽  
pp. 1684 ◽  
Author(s):  
Michael P. Schwarz
Keyword(s):  
Social Evolution ◽  
Sex Ratios ◽  
Social Bee

scholarly journals Sex ratios and social evolution

2006 ◽  
Vol 16 (17) ◽  
pp. R664-R668 ◽  
Author(s):  
David C. Queller
Keyword(s):  
Social Evolution ◽  
Sex Ratios

Biology of a weakly social bee, Exoneura (Exoneurella) setosa (Hymenoptera : Apidae) and implications for social evolution in Australian allodapine bees

1998 ◽  
Vol 46 (3) ◽  
pp. 221 ◽  
Author(s):  
Tania Neville ◽  
Michael P. Schwarz ◽  
Simon M. Tierney
Keyword(s):  
Group Size ◽  
Social Evolution ◽  
Sensu Stricto ◽  
Brood Production ◽  
Brood Rearing ◽  
Large Group ◽  
Basal Position ◽  
Social Bee

Australian allodapine bees provide excellent material for comparative approaches to understanding social evolution. The subgenus Exoneurella occupies a cladistically basal position in the Australian Exoneura group and comprises only four species. We describe sociality in one Exoneurella species, E. setosa, and combine this with other data to infer some patterns of social evolution in allodapines. E. setosa rears a first brood solitarily, although staggered brood production and the production of a second brood in some nests leads to a situation where older, recently emerged brood have the ability to help rear their younger siblings and this overlaps with opportunities to lay eggs. This is similar to the situation for two other phylogenetically distal species of Exoneurella, as well as for members of the genus Braunsapis, which is used as an outgroup for Exoneura. When combined with other studies, our results suggest that the opportunity for sib-rearing is a plesiomorphic trait for Australian allodapines and this has been largely lost in a distal subgenus, Exoneura sensu stricto. Instead, multifemale brood-rearing colonies in this latter group mostly comprise individuals of the same generation, and species exhibit large group size, univoltinism and kin cofounding. This suggests that evolution can favour semisociality and quasisociality, even when eusociality has already arisen.

scholarly journals Social Evolution: Evolving Sex Ratios

2011 ◽  
Vol 21 (24) ◽  
pp. R992-R994
Author(s):  
Edward Allen Herre ◽  
David M. Shuker ◽  
Stuart A. West
Keyword(s):  
Social Evolution ◽  
Sex Ratios

New research frameworks in the study of chimpanzee and gorilla sociality and communication

2019 ◽  
Author(s):  
Sam G. B. Roberts ◽  
Anna Roberts
Keyword(s):  
Social Evolution ◽  
Social Complexity ◽  
Brain Size ◽  
Social Systems ◽  
Strongly Correlated ◽  
The Social ◽  
Human Social Evolution ◽  
Research Frameworks ◽  
New Research ◽  
Large Groups

Group size in primates is strongly correlated with brain size, but exactly what makes larger groups more ‘socially complex’ than smaller groups is still poorly understood. Chimpanzees (Pan troglodytes) and gorillas (Gorilla gorilla) are among our closest living relatives and are excellent model species to investigate patterns of sociality and social complexity in primates, and to inform models of human social evolution. The aim of this paper is to propose new research frameworks, particularly the use of social network analysis, to examine how social structure differs in small, medium and large groups of chimpanzees and gorillas, to explore what makes larger groups more socially complex than smaller groups. Given a fission-fusion system is likely to have characterised hominins, a comparison of the social complexity involved in fission-fusion and more stable social systems is likely to provide important new insights into human social evolution

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